Search query: Laser-assisted nickel deposition onto porous silicon

Related papers:

abstract: As a direct metal patterning method, local electrodeposition of Ni onto porous silicon (PS) is studied. The principle of the method in this research utilizes the photo excitation of semiconductor, in contrast to the previous studies of laser assisted metal deposition, in which the deposition is enhanced by heating effects or sensitization by laser irradiation. Electrochemical measurements show the different behaviors between PS and planar Si. The current is lower for PS than planar Si. The higher rate of charge recombination in PS is considered as a probable reason of this low current in PS. Also it was shown that the nucleation rate was low on PS.
author_names: Junji Sasano

Patrik Schmuki

Tetsuo Sakka

Yukio H Ogata
title: Laser assisted nickel deposition onto porous silicon
year: 2003

abstract: Abstract Electroless nickel (nickel phosphorus alloy) plating onto a diamond surface prenucleated by a thin palladium layer via laser induced decomposition of palladium acetyl acetonate film was studied. The results on spatial selectivity and adherence of the nickel deposits are reported.
author_names: V A Laptev

Sergej M Pimenov

Georgii A Shafeev
title: Laser assisted nickel deposition onto synthetic diamonds
year: 1994

abstract: Abstract In this paper, a simple method is presented for the fabrication of nickel (Ni) patterns on porous silicon (PS) substrates using a focused and scanned Ar laser beam. A commercially available electroless plating bath was operated as a precursor during the laser direct writing process. As a result, thin t =40 250 nm) narrow w =2 3 mm) uniform and conductive Ni deposits were formed on the surface of the PS. The deposits were characterized by profilometry, FESEM (equipped with EDX) FIB and resistance measurements.
author_names: Krisztian Kordas

Janne Remes

Seppo Leppavuori

Laszlo Nanai
title: Laser assisted selective deposition of nickel patterns on porous silicon substrates
year: 2001

abstract: Nickel nanopillar arrays were electrodeposited onto silicon substrates using porous alumina membranes as a template. The characterization of the samples was done by scanning electron microscopy, X ray diffraction, and alternating force gradient magnetometry. Ni nanostructures were directly grown on Si by galvanostatic and potentiostatic electrodeposition techniques in three remarkable charge transfer configurations. Differences in the growth mechanisms of the nanopillars were observed, depending on the deposition method. A high correlation between the height of the nanopillars and the charge synthesis was observed irrespective of the electrochemical technique. The magnetization measurements demonstrated a main dependence with the height of the nanopillars. The synthesis of Ni nanosystems with a controllable aspect ratio provides an effective way to produce well ordered networks for wide scientific applications.
author_names: Matias Bejide

Patricio Contreras

P'ia Homm

Boris Duran

Jose Antonio Garcia-Merino

Andreas Rosenkranz

Juliano Casagrande Denardin

Rodrigo Del Rio

Samuel Hevia
title: Nickel Nanopillar Arrays Electrodeposited on Silicon Substrates Using Porous Alumina Templates
venue: Molecules
year: 2020

abstract: Abstract The multiwalled carbon nanotubes were successfully electrophoresis deposited onto porous silicon to form a multiwalled carbon nanotubes/porous silicon composite and were then fabricated into chemiresistive gas sensors. The morphology, microstructure and NO2 sensing characteristics of the composite were investigated by scanning electron microscopy, X ray diffraction, X ray photoelectron spectroscopy, Raman spectroscopy and gas sensing test. The results indicated that all the carbon nanotubes/porous silicon sensors showed typical p type semiconductor behavior at room temperature ~25degC) of the optimal working temperature. The carbon nanotubes/porous silicon sensor under the electrophoresis time of 5 min yielded the best NO2 sensing characteristics, including a high sensor response ~8.5) fast response recovery time ~37 s and ~34 s) good repeatability and selectivity toward 1 ppm NO2. The heterostructure effect as well as the high specific surface area and the unblocked porous structure was considered essential for the gas sensing performance.
author_names: Dali Yan

Shuguang Xia

Shenyu Li

Shouyu Wang

Ming Tan

Shiyu Liu
title: Electrophoretic deposition of multiwalled carbon nanotubes onto porous silicon with enhanced NO2 sensing characteristics
year: 2021

abstract: Abstract In this study, a low cost, simple, single step low voltage operation and a well controlled method for deposition of uniformed and unique size distributions of silver nanoparticles (AgNPs) on the porous silicon (PS) layer were achieved via controlling the drift velocity of electrons in an aqueous solution of AgNO3. The laser diode of 530 nm and 60 mW/cm2 laser wavelength and illumination power density was employed to prepare PS layer by a laser assisted etching process. The PS layer was incorporated on the platinum disk cathode electrode, and a stainless steel plate as an anode was employed. Low applied operating voltage of about 3V DC at different drift currents of 10, 20, 30 and 40 mA for 2 min was applied to sustain the drift motion of Ag2+ Structural properties of AgNPs layer were examined via the field emission scanning electron microscope (FE SEM) atomic force microscopy (AFM) and X ray diffraction (XRD) pattern. These measurements exposed that AgNPs were adjusted by controlling the drift current, and a uniform AgNPs with specific unique sizes were obtained. Grain size, specific surface area and nucleation sites of metallic AgNPs were intensely influenced by the drift current.
author_names: M Zayer

Alwan M Alwan

Ahmed S Ahmed

Amer B Dheyab
title: Accurate controlled deposition of silver nanoparticles on porous silicon by drifted ions in electrolytic solution
venue: Current Applied Physics
year: 2019

abstract: Abstract Here we prepare a composite of tungsten oxide films/porous silicon (WO3/PS) hybrid structure synthesized by electrochemical deposition of WO3 films onto p type PS with subsequent annealing process in air. The obtained WO3/PS products were investigated by scanning electron microscopy (SEM) X ray diffraction (XRD) and Raman spectroscopy (RS) The gas sensing properties of WO3/PS composite to NO2 ranging from room temperature (RT, ~25 degC) to 200 degC were studied. The result indicated that all the WO3/PS gas sensors showed typical p type semiconductor behavior and had an optimal working temperature of RT. Furthermore, compared with PS, the proper deposited WO3/PS composite exhibited a higher gas response, shorter response recovery time, good repeatability and selectivity toward NO2 gas at RT. This improvement probably owing to the heterojunction effect and its unique microstructure properties. In addition, the possible NO2 sensing mechanisms were also discussed in this paper.
author_names: Dali Yan

Shenyu Li

Shi-yu Liu

Ming Tan

Cao Meng
title: Electrodeposited tungsten oxide films onto porous silicon for NO 2 detection at room temperature
year: 2018

author_names: Gul Zeb

Thi Luong Duong

Marek Balazinski

Xuan Tuan Le
title: Direct Electroless Deposition of Nickel onto Silicon Nitride Ceramic: A Novel Approach for Copper Metallization of Micro /Nano fabricated Devices
year: 2020

abstract: Herein, we report a rapid and highly effective methodology for the fabrication of active and stable surface enhanced Raman scattering (SERS) substrate by an electrochemical anodization and immersion plating routes. Porous silicon (PSi) layers were fabricated by the electrochemical anodization of a silicon wafer in ethanoic fluoride solution, followed by uniformly deposition of palladium nanoparticles (Pd NPs) via a simple immersion plating technique. The structural features and morphology of fabricated frameworks of PSi Pd NPs have been investigated by field emission scanning electron microscopy (FE SEM) with energy dispersive X ray (EDX) X ray diffraction (XRD) X ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FT IR) spectra. The PSi substrate demonstrates a meso porous morphology with good distribution, good pore density and average pore sizes around 20 nm. The SERS performance of Si Pd NPs and PSi Pd NPs substrates has been examined taking imidacloprid (an insecticide) as a target analyte. The SERS signal of imidacloprid using PSi Pd NPs substrate exhibited immense enhancement compared to the Si Pd NPs substrate. The active substrate revealed excellent detectable performance with a concentration as low as 10 9 M imidacloprid and an enhancement factor (EF) of 1.2x105. This large EF is fundamentally ascribed to the combined effect of electromagnetic improvement and charge transfer mechanism. Additionally, no aging effect was observed for the present substrates kept in air for two weeks. Striking enhancement in Raman spectral signals obtained with the current PSi Pd NPs substrates provides a simple and smooth platform towards the sensitive detection of various target analytes.
author_names: A M Al-Syadi

M A M Faisal

Farid A Harraz

Mohammed Jalalah

Mabkhoot A Alsaiari
title: Immersion plated Palladium Nanoparticles onto Meso porous Silicon Layer as Novel SERS Substrate for Sensitive Detection of Imidacloprid Pesticide
year: 2020

abstract: The high price of silver has motivated the search for new paths in regard to the front metallization of crystalline silicon solar cells. Copper is a suitable material from the conductivity and cost point of view; however, contact resistivity and long term stability are still issues that must be addressed. The present work describes the results obtained in the improvement of frontal metallization of textured crystalline silicon solar cells. Laser chemical metal deposition has been used in the creation of nickel seed layers for subsequent copper plating. Conditions have been optimized to reduce the number of laser scan repetitions, and consequently the processing time per cell. The average finger width is below 80 microns, thus reducing the shaded area. In depth chemical and morphological characterization results of the seed layers are presented and related with laser settings and cell performance. The produced solar cells show viability of the process, leading to pseudoefficiencies exceeding 15%
author_names: Efrain Ochoa-Martinez

Niklas Wehkamp

Jose Ramon Ramos-Barrado

Jonas Bartsch
title: Progress on laser assisted nickel seed layer deposition for front contact copper plating
year: 2013