The 7th Southeast Asia Collaborative Symposium
on Energy Materials (SACSEM 7th)
16-17, Nov. 2021
Institut Teknologi Bandung (ITB, Indonesia)
King Mongkut's University of Technology Thonburi (KMUTT, Thailand)
Universität Duisburg-Essen (UDE, Germany)
Universiti Kebangsaan Malaysia (UKM, Malaysia)
University of the Philippines, Diliman（UPD, Philippines)
Universiti Teknologi PETRONAS (UTP, Malaysia)
University of Tsukuba (UT, Japan)

16th November, 2021 (Japan time)
Chair: Prof. Dr. Yosahikazu SUZUKI (UT)Time
16:00-16:10
16:10-16:25

No
OP
I01

Affiliation
UT
ITB

Presenter
Prof. Junji Nakamura
Prof. Brian Yuliarto

Title
Greeting and opening remark
Introduction

16:25-16:40

I02

KMUTT

Assoc. Prof. Dr.

Introduction to Faculty of Engineering, KMUTT

Asawin Meechai
16:40-16:55

I03

UDE

Dr. Tobias Teckentrup

Introduction

16:55-17:10

I04

UKM

Prof. Dr. Azizan Ahmad

Introduction

17:10-17:25

I05

UPD

Prof. Arnel Salvado

Introduction

17:25-17:40

I06

UTP

Dr.

FatimahIntroduction

Hayyiratul

Mohd Zaid
17:40-17:50

I07

UT

Prof. Dr. Yohei Yamamoto

Introduction

17:50-18:00

I08

UT

Prof. Dr.

Research

Motoyoshi Kobayashi

Bioresources and Environmental Engineering

18:00-18:10

Short breakandEducational

Topicsin

Chair: Prof. Dr Hayyiratul Fatimah Mohd Zaid (UTP)Time
18:10-18:25

No
I09

Affiliation
Presenter
UKM
Assoc. Prof. Dr.
Akrajas Ali Umar

Title
Atom-Thick 2H–WS2 Nanosheets’ ElectronTransport Layers for Enhanced Charge
Transfer in Perovskite Solar Cells

18:25-18:40

S01

ITB

Microwave-assisted

William Budiman

preparationofphotocatalyst based on reduced graphene
oxide/titanium dioxide nanocomposites
18:40-18:55

S02

UTP

Almila Hassan

Modification of Commercial Defoamers for
Efficient Foam Mitigation Under Simulated
Water-Alternating Gas (EWAG) Treatment

18:55-19:10

S03

UTP

Najihah Mazlan

An Insight into Adsorption Mechanism of Fatty
Hydrazide-Corrosion Inhibitors on Mild Steel

19:10-19:25

S04

KMUTT

Nattida Srisasiwimon

Nanostructured Photocatalysts for ConversionofLignocellulosic

Chemicals

1

Waste

to

High-Value17th November, 2021 (Japan time)
Chair: Dr. Arie Wibowo (ITB)Time
16:00-16:15

No
S05

Affiliation
Presenter
UKM
Nabilah Alias

16:15-16:30

S06

UPD

Gerald Angelo Catindig

16:30-16:45

S07

UDE

Dennis Oing

Title
Enhancing the interfacial carrier dynamics byatoms thick 2D TiS2 passivation of TiO2
nanograss electron transport layer in perovskite
solar cells
Strain studies on epitaxially-lifted off Gallium
Arsenide Films
A monolithic, back-gated diamond field-effecttransistor for electrically tunable color centers

16:45-17:00

S08

UT

Monika Tsunoda

Peptide beta-sheets/silver ion complex for
antibacterial silk fabric without discolouration

17:00-17:15

S09

UPD

Rogie M. Madula

Inducedstraininfluenceonmonolayer

graphene on fluorinated ethylene propylene
substrate for flexible gas sensor application
17:15-17:30 I10 UDE
17:30-17:45 Short break

Prof. Corina Andronescu

Electrocatalysis at nanoscale

Chair: Assoc. Prof. Dr. Loh Kee Shyuan (UKM)
Time

No

Affiliation

17:45-18:00

S10

KMUTT

Presenter

Title

Rattana Muangmora

Photocatalysis Technology for Treatments ofEmerging Organic Pollutants in Water

18:00-18:15

S11

UDE

Meike Tack

Sub-5 nm iridium oxide nanoparticles from laser
fragmentation in liquid as catalyst for waterelectrolysis

18:15-18:30

S12

UKM

Dilip K Sarkar

Synthesis of Zn doped NiOx by simple chemical
precipitation method using plant extract as acomplexing agent

18:30-18:45

S13

UT

Sho Aonuki

Notable improvement of the photoresponsivityof As-doped n-BaSi2 films by post-annealing

18:45-19:00

S14

ITB

Sarah Zulfa Khairunnisa

Mesoporous gold as a platform for plasmonic
sensor

19:00-19:10

Short break

Chair: Assis. Prof. Afalla, Jessica Pauline Castillo (UT)
19:10-19:20

CL

19:20-19:40

SE

To be announced

Award announcement and Closing Remark
Student exchange

2Invited Lectures3I02 Introduction to Faculty of Engineering, KMUTT
Assoc. Prof. Dr. Asawin Meechai
Associate Dean for International Affairs, Faculty of Engineering,
King Mongkut’s University of Thonburi (KMUTT), 126 Prachauthit Road,
Bangmod, Thungkru, Bangkok 10140, Thailand
E-mail: asawin.mee@kmutt.ac.th

The Faculty of Engineering was established concurrently with the Thonburi Technical Institutein 1971, followed by the first master’s degrees in 1975 and the doctoral program in 1990. Witha proud record of producing engineers with high practical skills, the undergraduate programsin engineering have been designed to archive a solid theoretical basis and professional
competence which equips graduates to play an active role in the industry immediately upon
graduating. The faculty also believes that research and consulting programs are carried out by
faculty staff, separately and sometimes as multi-disciplinary teams. The number of students
admitted into the faculty has increased steadily over the last twenty years and has risen
dramatically over the last few years, as the university struggles to keep pace with the demandfor engineers by a newly industrializing Thailand. At present, the faculty has the following
departments: Department of Chemical Engineering, Department of Civil Engineering,
Department of Computer Engineering, Department of Electrical Engineering, Department ofElectronics and Telecommunication Engineering, Department of Environmental Engineering,
Department of Food Engineering, Department of Control System and Instrumentation
Engineering, Department of Mechanical Engineering, Department of Production Engineering,
Department of Tool and Materials Engineering. The faculty also has a multidisciplinary
program called “Biological Engineering.” During the event, achievements, research activities,
collaborations, and academic aspects of the Faculty of Engineering will be introduced.

4

I09 Atom-Thick 2H–WS2 Nanosheets’ ElectronTransport Layers for Enhanced Charge Transfer
in Perovskite Solar Cells
Akrajas Ali Umar
Institute of Microengineering and Nanoelectronics, Universiti
Kebangsaan Malaysia, 43600 UKM bangi, Selangor, Malaysia.
Abstract
The structure and the electronic properties of the electron-transport layer (ETL) of perovskite
solar cells (PSCs) govern the interfacial charge transfer and charge transportation to theelectrode. The ETLs of two dimensions, that are atom thick, and have a planar structure thatpossesses special electronic properties, such as the surface collective motion of excitons or
charge transfer–driven defect state relief, that is 2D transition metal dichalcogenide, allow ahighly energetic carrier dynamic process for enhanced photovoltaic effect. Herein, we reportthat planar, few-atom-thick 2H–WS2 nanosheets’ ETLs drive ultrafast charge transfer andtransportation along the ETL during the photovoltaic process. The nature of carrier dynamic
and the performance of perovskite solar cells utilizing this atoms thik electron transport layer
will be discussed.
Biography of Akrajas Ali Umar:
Dr. Akrajas Ali Umar received his PhD in Physics from the National University of Malaysia
in 2004 in organic thin film for optical sensing application. He is currently Associate Professor
at the Institute of Microengineering and Nanoelectronics (IMEN), the National University of
Malaysia since 2011. His research interests are mainly in the field of Nanophysics andNanomaterial Chemistry with the emphasis for energy conversion application, particularly toinvestigate the role of atomic composition, surface structure and shape of nanostructures inphotoactivity and photoelectrical properties. He served as Kyoto University Venture BusinessLaboratory Postdoctoral Fellow (2004-2005) and Japan Society for the Promotion of Science(JSPS) Postdoctoral Fellow in Kyoto University, Japan, from 2005-2007. He was appointed asa World Class Professor in Faculty of Mathematics and Natural Sciences, Universitas Halu
Oleo-Indonesia in 2018 and 2021 and a visiting scientist in the School of Information Scienceand Technology, Fudan University, Shanghai, China from 2018 to 2019, working on flexible
perovskite solar cells. He was a visiting scientist in Kyoto University from 2008 to 2018. He
has published more than 200 papers with H-index 31.
Email: akrajas@ukm.edu.my5

Student / Young Researcher
Presentations

6

S01 Microwave-assisted preparation ofphotocatalyst based on reduced graphene
oxide/titanium dioxide nanocomposites
William, Budiman
Materials Science and Engineering Research Group, Institut Teknologi
Bandung,Ganesa Road No. 10, Bandung, Indonesia
E-mail: willjust96@gmail.com

In the past decades, many researchers devoted their efforts to enhance photocatalytic
performance of titanium oxide (TiO2) to degrade recalcitrant pollutants in water stream. One
of attractive strategy is by pairing TiO2 with reduced graphene oxide (rGO) to become rGO/
TiO2 nanocomposites, because rGO has high surface area that prevent agglomeration of TiO2
particles and allowing electron transfer from TiO2 to rGO to prevent fast recombination.
However, most of the mentioned studies used graphene oxide (GO) synthesized throughHummers method which might be harmful to environment because it may produce toxic NO
and NO2 gas from decomposition of HNO3. In this study, rGO/ TiO2 nanocomposites was
prepared by green and simple method, where GO precursor was synthesized by Tour method
and GO reduction was performed by microwave irradiation. We hope that the simple and green
synthesis of rGO/ TiO2 nanocomposites may encourage a new perspective of eco-friendly
fabrication of rGO/ TiO2 nanocomposites and their utilization as a promising photocatalyst forphotocatalytic degradation of dyes and other recalcitrant pollutants in water stream.
Publication
1. Andri Hardiansyah, William J. Budiman, Nurfina Yudasari, Isnaeni, Tetsuya Kida, andArie Wibowo, “Facile and green fabrication of microwave-assisted reduced graphene
oxide/titanium dioxide nanocomposites as photo-catalyst for rhodamine 6G
degradation”, under revision to be resubmitted to ACS Omega

7

S02 Modification of Commercial Defoamers for
Efficient Foam Mitigation Under Simulated WaterAlternating Gas (EWAG) Treatment
Almila Hassan1, Khairulazhar Jumbri1, Noorazlenawati
Borhan2, Mohd Sofi Numin1
1

Fundamental and Applied Sciences Department, Universiti Teknologi
PETRONAS, 31750 Tronoh, Malaysia
2
PETRONAS Research Sdn. Bhd, 43000 Bangi, Malaysia

The excessive formation of foam caused by the injection of surfactant foams in FAWAG
application has led to significant problems in the oil well production and separation facilities.
Over the years, the development of defoamers has reached its fourth generation, referring tomodified silicone defoamers. Several studies have shown that modified defoamer gives better
performances under harsh conditions and have greater solubility and efficiency. Besides,
studies also reveal that a Gemini-based modified defoamer can give good antifoaming ability
and remain active even when dissolved in a solvent. Unfortunately, not all defoamer
composition is suitable for every application since different oilfields may have different
treatment methods and conditions. Consequently, several different compounds should be
examined to determine the most appropriate defoamer for specific treatment. For this reason,
various commercially available defoamers with different family types were screened undersimulated EWAG treatment to select the best chemicals and then characterized to determine
the best parent chain for modification into Gemini based chemicals. Four modified siliconebased defoamers were successfully synthesized, characterized and the performance was
evaluated using TECLIS Foamscan under simulated EWAG treatment. Results show that all
four modified silicone-based defoamers, especially amide modified defoamer (S2), showed
excellent performance as a defoaming agent to mitigate foam under simulated conditions. The
study on the factor affecting the performance of defoamers has proved that the best-casecondition for the modified defoamer was at high temperature (60°C), gas flow rate of 1.0 L/min,and low ratio concentration of surfactant polymer-to-brine (30:70). The study on bubble counts
and distributions using KRÜSS Dynamic Foam Analyzer revealed that S2 excellently
contributes to the formation of unstable foams that can fasten foam destruction in the foaming
system. The observation also showed that the bubble count and distribution of S2 were foundto decrease as the average bubble size increases, therefore leading to a rapid coalescence andcollapsing of foams. Overall, the synthesis of new Gemini based modified defoamers derived
from commercial defoamers with high performance under simulated conditions can contributeto a new perspective in the synthesis approach for defoamers specific to separation applicationand highly concentrated foam surfactants.
Publication
1. Physio-Chemical Analysis of Amide and Amine Poly(dimethylsiloxane)-Modified
Defoamer for Efficient Oil-Water Separation.
Almila Hassan, Khairulazhar Jumbri, Anita Ramli, and Noorazlenawati Borhan
ACS Omega 2021 6 (23), 14806-14818. DOI: 10.1021/acsomega.1c00350

8

S03 An Insight into Adsorption Mechanism of
Fatty Hydrazide-Corrosion Inhibitors on Mild Steel
Najihah Mazlan1 and Khairulazhar Jumbri1
1

Department of Fundamental and Applied Sciences, Universiti Teknologi
PETRONAS, 32610 Seri Iskandar, Perak, Malaysia.
*Corresponding author: khairulazhar.jumbri@utp.edu.my

Corrosion of metals in pipelines is a gigantic concern in industrial performance, resulting
in environmental pollution and economic loss. The implementation of a cost-effective
technology in using waste palm oil as biobased corrosion inhibitors (CIs) has risen. However,
the inhibition mechanism of CIs remains unclear due to lack of comprehensive review andsmall number of existing experimental data. Molecular dynamics (MD) simulation was
employed to provide significant insights into adsorption mechanism and the influence of fatty
acid hydrazide derivatives as effective CIs on ferrous (110) metal surface in 1.0 M HCl medium
at temperature ranging from 298K to 383K. Simulation data showed that the inhibition
efficiency increases at low concentration of CIs, 0.04M and together with increasing oftemperature, which is suggestive of chemical adsorption mechanism from -200 kJ/mol up to 400kJ/mol. The result further suggested that thermal stability of CIs at high temperature wasincreased due to activation energy of CI-metal interaction from heat supplied. All the molecularsimulation results were consistent with the experimental findings. The understanding of theadsorption mechanism of fatty acid hydrazide derivatives on metal surface could be used as abasis for future development of specific biobased CIs for cost-effective corrosion control
technology.
Keywords: corrosion inhibitors (CIs), molecular dynamic (MD) simulation, adsorption,
inhibition efficiency

9

S04 Nanostructured Photocatalysts for Conversionof Lignocellulosic Waste to High-Value Chemicals
Nattida Srisasiwimon,1,2 Surawut Chuangchote,2,3,*
Navadol Laosiripojana,1 Takashi Sagawa4
1

The Joint Graduate School of Energy and Environment, King Mongkut’s
University of Technology Thonburi, 126 Prachauthit Rd., Bangmod,Thungkru, Bangkok 10140, Thailand
2
Department of Tool and Materials Engineering, Faculty of Engineering, King
Mongkut's University of Technology Thonburi, 126 Prachauthit Rd., Bangmod, Bangkok 10140,
Thailand3 Research Center of Advanced Materials for Energy and Environmental Technology (MEET), King
Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand
4 Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501,
Japan
E-mail: nattida.sris@gmail.com (NS); surawut.chu@kmutt.ac.th (SC); navadol.lao@kmutt.ac.th (NL);sagawa.takashi.6n@kyoto-u.ac.jp (TS)Green chemical production from lignocellulosic waste is widely considered attempted to
produce the desired products economically and substituting fossil fuels. Especially, lignin,
low-value waste of lignocellulosic biomass which is abundant aromatic structure components
and can be also useful for high-value chemical production. In this work, the conversion oflignin to high-value chemicals was investigated by photocatalysis. TiO2 has been successfully
exposed as a famous photocatalyst under UV light stimulation. Nevertheless, the limitation of
the TiO2 photocatalytic system is the suitable light energy to activate electrons. Therefore, theutilization of lignin as carbonaceous materials to modify TiO2 composited photocatalysts(TiO2/lignin) to enhance the photocatalytic activity is our attempt. The carbon composite
photocatalysts were synthesized by the sol-gel microwave technique. The effect of lignin
loadings showed good characteristic properties for improvement of the performance of TiO2,
including small crystallite size (7 nm of TiO2/lignin 1:0.5, compared with pristine TiO2-air 24
nm and TiO 2-N 2 9 nm) which are corresponding of grain size in TEM results, raise thephotoabsorption in the visible and UV region, and decrease PL intensity which is significantof the lower rate of recombination. TiO2/lignin 1:0.5 shows the highest surface area (92.89
m2/g, compared with pristine TiO2-air 6.15 m2/g and TiO2-N2 46.74 m2/g) and shows the best
photocatalyst with enhanced photocatalytic activity by increasing lignin conversion up to
40.28% under UVA irradiation and 15.73% under visible light. Finally, High-value chemicals,such as vanillin, were found after photocatalysis.

10S05 Enhancing the interfacial carrier dynamics by atoms thick 2D
TiS2 passivation of TiO2 nanograss electron transport layer inperovskite solar cells
Nabilah Alias, Nurul Ain Abd Malek, Mohd Yusri Abd Rahman, Akrajas Ali Umar*
Institute of Microengineering and Nanoelectronics (IMEN), UKM, National University of
Malaysia, Bangi 43600, Selangor, Malaysia.
Corresponding Email: akrajas@ukm.edu.my
Photoelectrical dynamics i.e. an efficient interfacial charge transfer and facile chargetransportation of the electron transport layer (ETL) of Perovskite solar cells (PSCs), aredesperately administered by the ETL properties. Despite the excellent energy alignment withmost perovskite materials, TiO2 nanograss (NG) having a large density of surface defects as aresult of sub-lattice vacancies has made them hurdle in the facilitation of enhanced
photogenerated carrier transport to the electrode. Herein, it is discovered that an atom -thick
2D TiS2 synthesized directly onto TiO2 nanograss ETL have effectively passivated the defects
allowing a facile interfacial charge transfer and transports as the PSCs produced a PCE as highas 18.73% with short-circuit current density (Jsc), open-circuit voltage (Voc), and fill-factor(FF) values as high as 22.04 mA/cm2, 1.13 V, and 0.752, respectively, a 3.3% improvementfrom the pristine TiO2-NG-based PSCs. This efficacious approach hence can be the basis forthe photoelectrical dynamics development of high-performance PSC devices.

Figure 1- Energy diagram of PSC with the addition of 2D TiS2 passivation layer.
Key Words: photoelectrical dynamics, perovskite solar cell, defect passivation, TiO2
nanograss, TiS2 atom thick

11

S06

12

S07

13

S08

14

S09 Induced strain influence on monolayer
graphene on fluorinated ethylene propylene
substrate for flexible gas sensor application
Rogie M. Madula1*, Vernalyn C. Copa1, Lorenzo P. Lopez Jr.1, Horace Andrew
F. Husay2, Jamela N. Pangasinan1, Charlene E. De Luna1, Armando S.
Somintac2, Elmer S. Estacio2, Arnel A. Salvador2
1Materials Science and Engineering Program, College of Science, University of the Philippines Diliman, Philippines
2National Institute of Physics, College of Science, University of the Philippines Diliman, Philippines

Email: rmmadula@up.edu.ph

We examine the influence of induced strain on monolayer graphene transferred on flexible
fluorinated ethylene propylene (FEP) substrate and fabricated into a chemiresistive gas
sensor. A strain of 0.77 % and 1.05 % were applied using a mechanical bender andcharacterized by Raman spectroscopy before, during, and after. Significant red shifts during
bending were observed up to 13 cm‐1 and 33 cm‐1 for the G and 2D peak of graphene,
respectively. The calculated rate of change of Raman shift per strain was ‐10.3 cm‐1 /% for theG peak and ‐30.4 cm‐1/% for the 2D peak. The sensing capability of the fabricated graphene
gas sensor was tested in an open system with individual exposure to 20 ppm concentrationof ammonia (NH3) and 20 ppm concentration of nitrogen dioxide (NO2) with a gas flow rateof 400 sccm. A notable change in resistance was observed during exposure with values of ‐34
 for NH3 and ‐295  for NO2 with calculated percent sensitivity of 1.2 % and 1.1 %,respectively. The influence of strain on the sensing capacity of graphene gas sensor was alsostudied. Upon application of strain to the device during gas exposure, a remarkable change
in resistance were observed with values of up to ‐93.7  for NH3 and ‐791  for NO2.

15

S10 Photocatalysis Technology for Treatments ofEmerging Organic Pollutants in Water
Rattana Muangmora,1 Patiya Kemacheevakul,1,2,*
Surawut Chuangchote 2,31

Department of Environmental Engineering, Faculty of Engineering, King
Mongkut's University of Technology Thonburi, 126 Prachauthit Rd.,
Bangmod, Bangkok 10140, Thailand
2
Research Center of Advanced Materials for Energy and Environmental Technology (MEET), King
Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand
3
Department of Tool and Materials Engineering, Faculty of Engineering, King Mongkut's University ofTechnology Thonburi, 126 Prachauthit Rd., Bangmod, Bangkok 10140, Thailand
E-mail: rattana.mua@mail.kmutt.ac.th (RM); patiya.kem@kmutt.ac.th (PK); surawut.chu@kmutt.ac.th(SC)

With the progress of environmental analysis technology, a variety of unexpected organic
compounds have been detected in natural water worldwide. Emerging organic pollutants(EOPs) are unregulated water pollutants that may contribute to negative effects on livingorganisms even though their concentrations are low. Caffeine is one of the EOPs. It is
commonly found as a constituent in various consumer products (e.g., coffee, tea, soft drink,and energy drink). The occurrence of caffeine in water bodies is mainly due to routine excretionfrom humans and incomplete removal from conventional wastewater treatment processes.
Photocatalysis technology is gaining interest as an alternative approach for water purification.
Organic pollutants can be degraded by the attack of free radicals in which produced from lightirradiation on photocatalytic materials. This study aimed to evaluate the efficacy of thephotocatalytic process for the degradation of caffeine in water. Titanium dioxide (TiO2) waschosen as a photocatalyst because of its high chemical stability, availability, and safety to theenvironment. Concentrations of caffeine in water were determined by high-performance liquid
chromatography (HPLC). The results showed that TiO2-based photocatalysis is potentially able
to remove caffeine from the water. 20 mg/L of caffeine was found to be degraded withefficiencies up to 100% under ultraviolet-C irradiation for 3 h. The degradation rate decreased
with increasing caffeine concentration thus more reaction time was required to achieve its
complete removal. TiO2 coated circular glass sheet can greatly overcome the separation
problem of nanosized-TiO2 from the treated water, and it can be reused for fifteen cycles
without a significant loss of its activity.

16

S11

17

S12 Synthesis of Zn doped NiOx by simple chemical precipitation
method using plant extract as a complexing agent
D. K Sarkar, A. K Mahmud Hasan, Vidhya Selvanathan, M. Mottakin,
Md. Akhtaruzzaman*
Solar Energy Research Institute (SERI), UKM, National University of Malaysia, Bangi43600, Selangor, Malaysia.
Corresponding Email: akhtar@ukm.edu.my

Abstract
NiOx is a promising candidate as the hole transporting material (HTM) for perovskite solar
cells (PSCs) due to its suitable bandgap, deep valence band and high stability. At normal
temperature, solution-processed NiOx as HTM for PSCs is required to be improved since it has
been reported as very low conductivity. In this work using plant extract as a complexing agent,
Zn doped NiOx has been synthesized by a simple chemical precipitation method. The preparedmaterials were calcined at 500°C and characterized by XRD, UV-Vis and FESEM to confirm
material composition and properties. The crystallite size, lattice parameter, dislocation density
and strain were calculated from XRD results. The preferred orientation 100 and 101 planes
were found at two theta angles 31.56 and 36.06 degrees, respectively, shown in figure-1. The
FESEM result shows the synthesised material's morphological structure, which is composed ofalmost uniform spherical particles with an average size 52.1 nm. The optical band gap has
been calculated from UV-Vis spectroscopy as a function of wavelength. The calculated band
gap is found to be 3.24 eV.

Figure-1 XRD pattern of NiZnO2 material prepared by chemical precipitation method
Key words: doping, plant-extract, bandgap, absorbance, precipitation
18

S13

19

S14 Mesoporous gold as a platform for plasmonic
sensorSarah Zulfa Khairunnisa, Ni Luh Wulan Septiani, Muhammad
Iqbal, Nugraha Nugraha, Brian Yuliarto
Advanced Functional Materials Laboratory, Department of Engineering
Physics, Institute of Technology Bandung (ITB), Bandung, 40132,
Indonesia
Research Center for Nanosciences and Nanotechnology (RCNN), Instituteof Technology Bandung (ITB), Bandung, 40132, Indonesia
Department of Science and Nanotechnology, Institute of Technology
Bandung (ITB), Bandung, 40132, Indonesia
E-mail: 38720005@mahasiswa.itb.ac.id, brian@tf.itb.ac.id

Until today, sensor technology is still developing to optimize detection of any substances that is neededin many applications, such as health care, environmental applications, and biotechnology-basedindustries. As one of the methods, optical sensors offer many advantages in detecting biologicalsubstances or chemical molecules. Optical sensors give a real-time and label-free detection, has a highspecificity and sensitivity, also its size can be made compactly with affordable cost.
Gold materials are widely known of its application in working as a platform for optical sensor since it
has a good plasmonic property and biocompatible. The plasmonic property of gold arises since gold
material is a metal and containing lots of free electrons that could collectively oscillate when given
incident light. The propagation of plasmon of a gold thin film will occur along its surface and thephenomena is known for surface plasmon resonance (SPR) while for gold nanoparticles, the plasmon
resonance will be localized (called LSPR) and gives higher sensitivity detection.
In both SPR and LSPR, the effect of refractive index changes in the environment will introduce
transduction mechanism in sensing since there will be a shift of the plasmonic peaks. Moreover, tocontinue optimize of the sensor system, plasmonic response could be tuned based on the changes of thesize, shape, or composition of gold nanoparticles. With this, there are a wide variety of options to be
explored based on the gold dimension. The selection gold mesoporous structure potentially supports
the plasmonic sensor since it offers many active sites on the surface stably and results in larger surface
to volume ratio. The fabrication of the gold mesoporous will be presented by exploiting electrochemical
deposition method which gives uniform porous structure with the help of the block-copolymer as the
porogens.

20