Search query: CdS microwave

Related papers:

abstract: Nanoscale two dimensional nanostructures have shown great potential as functional components in photocatalysis. Here, we report our investigations on the synthesis of heterostructured hybrids, comprised of 0D CdS nanoparticles as semiconductor and 2D/2D graphene/MoS x as co catalyst. Our approach involves a rapid microwave assisted reaction in autoclave conditions, by adopting either one step or two step protocol. The chemical speciation of the nanocomposites was found to depend strongly from the compounding conditions of the precursor substances. The photocatalytic activity was assessed by monitoring the photodegradation rate of 4 nitrophenol in solution, using simulated solar light irradiation. The photocatalytic activity of the hybrids may be attributed to a combination of beneficial characteristics, strongly related to the chemical speciation of the composite components. Moreover, intimate contacts of the latter result in efficient heterojunctions. Overall, the present study provides valuable insight regarding the development of functional heterostructured photocatalysts comprised of two dimensional nanomaterials.
author_names: Iordanis Tzanidis

Feidias Bairamis

L Sygellou

Konstantinos S Andrikopoulos

Apostolos Avgeropoulos

Ioannis K Konstantinou

Dimitrios Tasis
title: Rapid Microwave Assisted Synthesis of CdS/Graphene/MoSx Tunable Heterojunctions and Their Application in Photocatalysis.
venue: Chemistry
year: 2020

abstract: Abstract Inorganic organic hybrid materials, a class of probable candidates for combining two counterparts into one structure could be beneficial for improving or combing the excellent electronic, magnetic, rigidity and thermal stability, and optical feathers of inorganic frameworks with diverse structure, processability, flexibility and good geometric controllability of organic molecules. Anchoring inorganic organic hybrid materials with cocatalysts is a usually used strategy for enhancing their catalytic performance. However, noble metal cocatalysts always limit their practical application. Herein, we report that noble metal free cocatalyst of Ni2P decorated CdS diethylenetriamine (CdS DETA) can effectively overcome this limitation to achieve highly photocatalytic hydrogen production. The rapid microwave solvothermal synthesis of CdS DETA (MCdS DETA) process shortens reaction time, saves energy and lead to achieve highly photocatalytic activity due to its low crystallinity. When Ni2P decorated MCdS DETA, The 0.4%Ni2P/MCdS DETA exhibited the highest photocatalytic hydrogen evolution activity (6836 mmmol h 1 g 1) which is 4.14 times, 2.06 times and 1.34 times higher than traditional solvothermal CdS DETA(TCdS DETA) MCdS DETA and Pt cocatalysted MCdS DETA, respectively. The method reported here can be extended to other inorganic organic hybrid materials, and develops new strategies for exploring inorganic organic hybrid based photocatalysts.
author_names: Taiping Hu

Kai Dai

Jinfeng Zhang

Guangping Zhu

Changhao Liang
title: Noble metal free Ni2P as cocatalyst decorated rapid microwave solvothermal synthesis of inorganic organic CdS DETA hybrids for enhanced photocatalytic hydrogen evolution
venue: Applied Surface Science
year: 2019

abstract: Abstract Structural analysis of Dy@CdS quantum dots (QDs) were investigated by the XRD and TEM/HRTEM. The particle size of Dy@CdS QDs was varies from 7.3 0.8 to 6.6 0.08 nm for 0.3% and 1.2% of Dy contents respectively. The vibrational spectra of pristine and Dy@CdS QDs exhibit the longitudinal phonon modes at 293 and 587 cm 1. Optical band gap of 2.5 eV was optimized at 0.6% Dy doped CdS sample and found to be decreased on further increasing the Dy3+ content from 0.9 to 1.2% The peaks at 414 and 466 nm are attributed to excitonic and trapped emission in the photoluminescence (PL) spectra of Dy@CdS samples respectively. The red shifts in PL spectra were observed for Dy3+ content more than 0.6% in Dy@CdS QDs. The frequency dependent characteristics of dielectric constant, dielectric loss, tangent and ac conductivity of Dy@CdS QDs were investigated at 300 K. It was founded that lower frequency range is dominated by the space charge polarization whereas orientational polarization is dominant at higher frequencies by increasing the dielectric constant. The variation of ac electrical conductivity was carried out linearly in the frequency range 15 kHz 10 MHz. The easy way of repeatability, tenability and scalability of Dy@CdS QDs are attributed for optoelectronics application.
author_names: Kamlesh V Chandekar

Mohd Shkir

Aslam Khan

Salem AlFaify
title: An in depth study on physical properties of facilely synthesized Dy@CdS NPs through microwave route for optoelectronic technology
year: 2020

abstract: The development of a highly efficient and rapid method for the accurate preparation of photocatalysts with novel morphologies is a hot research topic. The different morphologies of BiVO4 was prepared using surfactants assisted microwave method, and demonstrated irregular (no surfactant) octahedral (sodium dodecyl benzene sulfonate) olive like (polyvinylpyrrolidone) and hollow structures (ethylenediaminetetraacetic acid) respectively. The BiVO4 CdS were synthesized using the chemical bath deposition method with different morphologies of BiVO4 as the substrates. The hollow structure of BiVO4 displayed the highest photocatalytic performance. Moreover, the photodegradation rates of the hollow structure BiVO4 CdS on tetracycline hydrochloride and ciprofloxacin were about 1.8 and 1.5 times higher than the corresponding BiVO4, indicating that the Z scheme heterojunction can improve the photogenerated electron pairs separation efficiency. Furthermore, the regulation mechanism of morphology and energy band position, as produced using the surfactants, has also been thoroughly investigated in this work, which provides a novel insight into the efficient and rapid preparation of photocatalysts with special morphology and high performance.
author_names: Xiufang He

Yunfeng Li

Xia Yang

Giancarlo Cravotto
title: Surfactants assisted preparation of BiVO4 with novel morphologies via microwave method and CdS decoration for enhanced photocatalytic properties.
venue: Journal of hazardous materials
year: 2020

abstract: Abstract In this work, we have prepared WO3 CdS nanocomposites for supercapacitor electrode by Microwave Assisted Method. The orthorhombic and monoclinic mixed structure of WO3 and hexagonal structure of CdS was observed by XRD pattern. The FESEM micrograph showed the irregular particle shape and HRTEM images demonstrated the small rod shape morphology with irregularity. The EDAX analysis confirmed the presence of W and Cd elements. From the electrochemical analysis, we have calculated the maximum capacitance as 650 F/g for WO3 CdS (6 wt% electrode. The long cycle test showed 133% of capacitance retention with 100% Coulombic efficiency.
author_names: Prakash Periasamy

T Krishnakumar

V P Devarajan

Murugesan Sandhiya

Marappan Sathish

Murthy Chavali
title: Investigation of electrochemical supercapacitor performance of WO3 CdS nanocomposites in 1 M H2SO4 electrolyte prepared by microwave assisted method
year: 2020

abstract: Herein, we present the facile synthesis of different content of chromium (Cr) doped CdS quantum dots (Cr@CdS QDs) using microwave route within 15 min. The synthesized Cr@CdS QDs were investigated for structural, morphological, opto dielectric, and electrical natures. X ray diffraction confirms the monophasic hexagonal system of Cr@CdS and the sizes of crystallites are calculated to be 8.72, 7.04, 8.84, 6.56, 5.96, 6.52 and 6.99 nm for 0.0, 0.5, 1.0, 5.0, 10.0, 15.0, and 20.0 wt% Cr@CdS samples. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) studies reveal the quantum dots size spherical shape morphology of synthesized Cr@CdS samples and the size is noted in range of 8.5 8.1 nm. The lattice spacing and orientation of grown QDs was also evaluated by high resolution TEM and Selected Area Electron Diffraction (SAED) pattern. Diffused reflectance spectra were recorded and Kubelka Munk theory is employed to estimate the energy gap. The energy gap was estimated between 2.4 and 2.46 eV for Cr@CdS QDs. Photoluminescence (PL) emission spectra own an strong emission peak in both spectra recorded at two different excitation wavelengths and revealed that the PL emission intensity is quenched with Cr doping in CdS. Dielectric and ac electrical studies shows the dependence on frequency and Cr content doping, and constant values are enhanced from 14 to 17 at 4 MHz. The prepared Cr@CdS QDs will be highly useful as sensitizers in solar cell, spintronics, and optoelectronics.
author_names: Mohd Shkir

Ziaul Raza Khan

Kamlesh V Chandekar

Thamraa Alshahrani

Ashwani Kumar

Salem AlFaify
title: A facile microwave synthesis of Cr doped CdS QDs and investigation of their physical properties for optoelectronic applications
venue: Applied Nanoscience
year: 2020

abstract: Abstract Semiconductor CdS/Multiwalled carbon nanotube quantum dots with crystallite size of 2 3 nm have been successfully synthesized by an ultrasound assisted microwave method. The sap of opunica ficus indica fruit is used as natural capping agent to enhance the quantum dot's stability. The synthesized CdS/MWCNTs QDs were characterized by XRD, UV Visible, FT IR, HR TEM, DLS, TGA, DTA and XRF. The photocatalytic activity of the QDs was tested for the degradation of dye, pararosaniline under simulated Ultra violet radiation. The degradation rate was found up to 99.19% within 150 Min. The influence of QDs as corrosion inhibition on zinc plate in three aerated electrolytes solutions namely NaCl, HCl and KOH was studied by Tafel polarization technique. The result showed that corrosion resistance succeeded due to CdS/MWCNTs QDs coating over Zn surface.
author_names: Kannan Kandasamy

S Surendhiran

Y A Syed Khadar

Paramasivan Rajasingh
title: Ultrasound assisted microwave synthesis of CdS/MWCNTs QDs: A material for photocatalytic and corrosion inhibition activity
year: 2020

abstract: A novel reduced graphene oxide graphene CdS/CuS nanoplate (G CdS/CuS NP) was fabricated using a microwave method of loading CdS nanoplates onto graphene sheets (G CdS NP) and subsequent cation exchange between G CdS NP and Cu(NO3)2. The prepared G CdS/CuS NP exhibited excellent photocatalytic activity which was attributed to the synergy between graphene and CdS/CuS NP. The heterostructure in the CdS/CuS NP lead to an efficient charge transport across the interface. Graphene facilitated the transformation of electrons and reduced the recombination of electron hole pairs. These results provide a fabrication method for highly active photocatalysts and will lead to future rational design of photocatalytic materials.
author_names: Bin Zeng

Wujun Zeng
title: Microwave Assisted Ion Exchange Synthesis and Enhanced Visible Light Photoactivity of Graphene CdS/CuS Nanoplates.
venue: Journal of nanoscience and nanotechnology
year: 2020

abstract: Semiconductor based heterojunction photocatalysts with a special active crystal surface act as an essential part in environmental remediation and renewable energy technologies. In this study, an RGO/CdS/TiO2 step scheme with high energy {001} TiO2 facets was successfully fabricated via a microwave assisted solvothermal method. The photocatalytic performance of as prepared samples was assessed by degrading methylene blue under visible light irradiation. We found that the photocatalytic activity of the RGO/CdS/TiO2 step scheme heterojunction was related to the proportion of TiO2. A ternary sample with a TiO2 content of 10 wt% exhibited superior photocatalytic performance, and approximately 99.7% of methylene blue was degraded during 50 min of visible illumination which was much higher than the percentages found for TiO2, CdS, RGO/TiO2, and RGO/CdS. The greatly improved photocatalytic performance is due to the exposure of the reactive {001} surface of TiO2 and the formation of a CdS/TiO2 heterojunction step scheme, which effectively inhibits the recombination of charge carriers at the heterogeneous interfaces. Moreover, the incorporation of graphene further enhances the visible light harvesting and serves as an electron transport channel for rapidly separating photogenerated carriers. Based on the PL, XPS, photoelectrochemical properties and the free radical capturing experiment results, a possible photodegradation mechanism was proposed.
author_names: Zilun Ma

Li-yan Shi

Wenwen Qu

Qiong Hu

Yijun Wang

Zhen Chen
title: Microwave assisted synthesis of an RGO/CdS/TiO2 step scheme with exposed TiO2 {001} facets and enhanced visible photocatalytic activity
year: 2020

abstract: Hierarchical binary CdS/BiOCl heterostructures comprised of CdS nanoparticles (NPs) decorating on BiOCl nanoflakes (NFs) for the enhanced photocatalytic activity were fabricated by a facile two step microwave assisted aqueous chemical reaction. The chemical composition, morphology, crystal structure, and optical properties of the CdS/BiOCl nanostructures were characterized by various techniques. The results indicated that island like CdS NPs with 10 30 nm in size are planted on the surface of BiOCl NFs primarily exposed {001} facets with diameter in the range of 200 600 nm and thickness of about 30 nm. The possible growth mechanism for the satellite core structured hybrid CdS/BiOCl architectures was proposed. Particularly, CdS/BiOCl 3 exhibited the superior photocatalytic activity for the decomposition of Congo red in high concentration under visible light irradiation, in which the pseudo first order kinetic rate constant was 2.33, 8.32 and 2.06 times higher than that of pure CdS, pristine BiOCl and the physical mixture. The promotion mechanism could be ascribed to the perfect band matching and efficient internal charge transfer within the engineered heterojunction, resulting in the lower carrier recombination loss and the longer lifetime of electron hole pairs. Furthermore, the high photocatalytic performance for the degradation of malachite green and methyl red suggests a promising application in industrial wastewater purification.
author_names: Chonghai Deng

Hanmei Hu

Hong Yu

Juanjuan Xu

Mengyi Ci

Yiping Wu

Lili Wang

Sane Zhu
title: Facile microwave assisted fabrication of CdS/BiOCl nanostructures with enhanced visible light driven photocatalytic activity
venue: Journal of Materials Science
year: 2020