Journal ArticleDOI
Photoluminescence quenching technique: A sensitive probe for detecting organic vapors at low PPM
TLDR
In this article, photoluminescence (PL) quenching technique was used to study and analyse sensor parameters like sensitivity, response time and recovery time at low ppm, and the morphological changes in porous structure and the chemical nature of organic adsorbates were the primary reasons for sensing by porous silicon.Abstract:
Crucial sensor parameters like sensitivity, response time and recovery time at low ppm were studied and analysed by photoluminescence (PL) quenching technique A comparison was drawn from various porous silicon samples prepared under different electrochemical anodization conditions Porosity dependent sensing results were analysed and it was observed that samples turned more sensitive with an increase in porosity Samples were tested in the presence of linear aliphatic alcohols (methanol to n-octanol) and water in the range of 10–100 ppm Trifling response was shown for water, while a discernible change in sensitivity was observed when samples were tested with alcohols The morphological changes in porous structure and the chemical nature of organic adsorbates were ascertained to be the primary reasons for sensing by porous siliconread more
Citations
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Journal ArticleDOI
Porous silicon biosensor: current status.
TL;DR: The present review describes the fabrication of nano-porous silicon and its biosensing capabilities for detection of various analytes including, but not limited to, glucose, DNA, antibodies, bacteria and viruses.
Journal Article
The one phonon raman spectrum in microcrystalline silicon
H. Richter,Z. P. Wang,Lothar Ley +2 more
TL;DR: In this paper, a relaxation in the q-vector selection rule for the excitation of the Raman active optical phonons was proposed to increase the red shift and broadening of the signal from microcrystalline silicon films.
Journal ArticleDOI
Photo-induced electrochemical anodization of p-type silicon: achievement and demonstration of long term surface stability.
TL;DR: This study provides a route for preparing highly sensitive organic vapour sensors with a precise selection of the fabrication parameters and demonstrating their prolonged performance by fabrication using a photoluminescence quenching technique.
Journal ArticleDOI
Optical measurement of trace level water vapours using functionalized porous silicon: selectivity studies
TL;DR: In this article, a simple and compact design of portable optical sensors, applicable for water vapour sensing is proposed, which is tested as sensors in the presence of linear aliphatic alcohols and water vapours in the wide range of 0-400 ppm.
Journal ArticleDOI
Morphology dependent PL quenching of multi-zone nanoporous silicon: Size variant silicon nanocrystallites on a single chip
TL;DR: In this article, a single-plane multi-zone nano-porous silicon (n-PS) was prepared using laser-induced electrochemical etching technique and optical sensing studies were performed.
References
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Journal ArticleDOI
The one phonon Raman spectrum in microcrystalline silicon
H. Richter,Z. P. Wang,Lothar Ley +2 more
TL;DR: In this paper, a relaxation in the q-vector selection rule for the excitation of the Raman active optical phonons was proposed to increase the red shift and broadening of the signal from microcrystalline silicon films.
Journal ArticleDOI
The effects of microcrystal size and shape on the one phonon Raman spectra of crystalline semiconductors
TL;DR: In this article, the effect of the exact shape of the microcrystal and the relationship between the width, shift and asymmetry of the Raman line is calculated and is in good agreement with available experimental data.
Journal ArticleDOI
Porous silicon microcavities as optical chemical sensors
Viviana Mulloni,Lorenzo Pavesi +1 more
TL;DR: The optical properties of porous silicon microcavities are strongly dependent on the environment as discussed by the authors, and both the luminescence intensity and peak position are affected by organic substances, giving the possibility to obtain dual-parameter optical sensors.
Journal ArticleDOI
Reversible luminescence quenching of porous silicon by solvents
TL;DR: In this article, the photoluminescence observed from porous Si is revesibly quenched on exposure to organic solvent molecules, indicating that this material is extremly surface sensitive.
Journal ArticleDOI
Optical sensing of flammable substances using porous silicon microcavities
TL;DR: In this article, a porous silicon multilayer, constituted by a Fabry-Perot cavity between two distributed Bragg reflectors, is exposed to vapor of several organic species and different resonant peak shifts in the reflectivity spectra, ascribed to capillary condensation of the vapor in the silicon pores, are observed.