Optimizing of porous silicon alloying process with bimetallic nanoparticles

Alwan, Alwan M.; Hashim, Duaa A.; Jawad, Muslim F.

doi:10.1007/s13404-018-0242-3

Cited by 25 publications

(5 citation statements)

References 22 publications

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“…Figure 1 shows the fabrication setup of bare Si nanocolumns substrates Fabrication of Ag NPs/Si nanocolumns hybrid atructure.-A 99% purity 10 −3 M AgNO 3 salt was dissolved in triply-distilled water and bare Si nanocolumns were then dipped in 10 −3 M of salt solution for about 5 min at room temperature. Dipping of bare Si nanocolumns into a salt solution containing ions of metal (Ag +1 ) leads to spontaneous growth of silver nanoparticles by means of silver ion reduction through Si-H dangling bonds on the surface 11,12 2Si-H (surf. )…”

Section: Methodsmentioning

confidence: 99%

Influence of Ag NPs on Silicon Nanocolumns NH₃Gas Sensors

Hashim

Alwan

Jawad

2018

J. Electrochem. Soc.

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Al hybrid structures, have been fabricated and tested. A bare silicon nanocolumns layer was synthesized by a laser-assisted electrochemical etching process in HF solutions. The surface morphology of bare Si nanocolumns was modified by incorporating Ag NPs into Si nanocolumns by simple and fast immersions methods in an aqueous solution of AgNO 3 to synthesize a hybrid structure. Characteristic features of bare Si nanocolumns and hybrid structure were investigated using scanning electron microscopy, EDS analysis, FTIR spectra, X-ray diffraction, and photoluminescence spectra (PL). The electrical characteristics of sensors with and without NH 3 gas were measured at room temperature. The results showed that the nanoparticles grain size, nature, specific surface area (S.S.A) of Ag NPs, and morphological structure of the Si nanocolumns strongly affected the property characteristics. A significant enhancement in sensitivity, response, and recovery times of gas sensor for a hybrid structure was realized after compared with Al/Si nanocolumns/n-Si/Al gas sensor due to the high specific surface area.

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Section: Methodsmentioning

confidence: 99%

Influence of Ag NPs on Silicon Nanocolumns NH₃Gas Sensors

Hashim

Alwan

Jawad

2018

J. Electrochem. Soc.

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“…The easy to manufacture and etching process cheapness made it the perfect material for a sensor, which has been producing using various shapes [9,10]. In recent years, the operation of many chemical sensors using PSi has been detected due to the porosity within it, and it is one of the significant properties, which can be defined as the portion of void within the PSi layer [11] and a factor that describes the top graph of the PSi layer's surface, which is affected by the etching conditions [12]. These studies have shown that: as the etching time and current density increase, the porosity increases as well as pore formation increases.…”

Section: Introductionmentioning

confidence: 99%

Study of the Vacuum Pressure Sensing from the Electrical Resistance Response of Porous Silicon Fabricated via Photo-Electrochemical Technique

Dawood¹,

Zayer²,

Jawad³

2022

JASN

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The manufacturing of vacuum sensors is critical to several vacuumbased applications. Porous silicon (PSi) was chosen as the vacuum sensor due to the possibility of moving air particles settled inside the pores while being put in the vacuum. The characteristics of porous silicon sensing to the evacuation of gases during vacuum was inferred by changing in the electrical resistivity. This work depends on the change in the electrical resistance of the PSi layers that was prepared via photo-electrochemical technique on the n-type (100) oriented silicon wafer. The surface topography of porous silicon is necessary to understand the morphological properties. Therefore, structural and morphological characterization of PSi samples were studied and analyzed using the scanning electron microscope (SEM) and X-Ray Diffraction (XRD) pattern. The etching process was carried out with various etching times, hydrofluoric acid (HF) concentration, and constant current density. The results showed that the pore size is increased as the etching time increased. The etching time produced pores of different sizes. The electrical resistance values were calculated after placing the sample in the vacuum system, starting from atmospheric pressure down to 10 −5 torr. The electrical properties of PSi indicate that electrical resistance gradually decreases with increasing vacuum pressure.

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“…The SERS sensor mainly consists of plasmonics nanoparticles incorporated on a based substrate. One of the most popular and significant substrates for developing this type of chemical sensors is the PSi [12,13]. The structural properties (surface morphology, silicon nanocrystallites, and the amount of nucleation sites) are the very specific parameters for the formation of the plasmonic nanoparticles for the sensor.…”

Section: -Introductionmentioning

confidence: 99%

The Effects of Psi Morphology on the Detection Efficiency of the Au-Nps Hot Spot SERS Sensors

Mahmood¹,

Alwan

2021

eijs

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This work is related to the investigation of the effects of porous silicon (PSi) morphologies on the performance of plasmonic gold nanoparticles (Au-NPs) hot spot SERS sensors for the detection of amoxicillin molecules. Two Si wafers with different resistivity values of 10 and 100 Ω.cm were used to synthesize a PSi layer of pores- and mud-like structures, respectively, by pulsed photo chemical etching process. The hot spot SERS sensors were synthesized by incorporating the Au-NPs within the PSi morphologies of pores- and mud- like structures which are characterized by high density of nucleation sites. Plasmonic Au- NPs with different sizes and hot spot regions were incorporated into the porous structures by the ion reduction process. It was recognized that the PSi morphologies have a considerable influence on the fabrication process of the detection sensors and, consequently, on the detection process. The plasmonic Au-NPs hot spot SERS sensor based on the PSi morphology of the mud-like structures shows higher sensitivity than that of pores-like structures, even at very low concentrations of amoxicillin solutions.

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Optimizing of porous silicon alloying process with bimetallic nanoparticles

Cited by 25 publications

References 22 publications

Influence of Ag NPs on Silicon Nanocolumns NH₃Gas Sensors

Influence of Ag NPs on Silicon Nanocolumns NH₃Gas Sensors

Study of the Vacuum Pressure Sensing from the Electrical Resistance Response of Porous Silicon Fabricated via Photo-Electrochemical Technique

The Effects of Psi Morphology on the Detection Efficiency of the Au-Nps Hot Spot SERS Sensors

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Optimizing of porous silicon alloying process with bimetallic nanoparticles

Cited by 25 publications

References 22 publications

Influence of Ag NPs on Silicon Nanocolumns NH3Gas Sensors

Influence of Ag NPs on Silicon Nanocolumns NH3Gas Sensors

Study of the Vacuum Pressure Sensing from the Electrical Resistance Response of Porous Silicon Fabricated via Photo-Electrochemical Technique

The Effects of Psi Morphology on the Detection Efficiency of the Au-Nps Hot Spot SERS Sensors

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Influence of Ag NPs on Silicon Nanocolumns NH₃Gas Sensors

Influence of Ag NPs on Silicon Nanocolumns NH₃Gas Sensors