Electrostatic gas sensor with a porous silicon diaphragm

Kim, Hyeok-Gi; Lee, Ki-Won

doi:10.1016/j.snb.2015.04.118

Cited by 14 publications

(8 citation statements)

References 22 publications

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“…The early stages of PS-based application research are focused mainly on the development of optoelectronic devices such as light emitting diodes (LED) and waveguides [34,35]. However, development of optoelectronic devices using a PS layer is limited by several problems.…”

Section: Introductionmentioning

confidence: 99%

“…Since the observation of PL from PS, there has been much interest in recent years on the structural and optical properties of PS due to its potential use in Si-based optoelectronic devices and sensors. The early stages of PS-based application research are focused mainly on the development of optoelectronic devices such as light emitting diodes (LED) and waveguides [ 34 , 35 ]. However, development of optoelectronic devices using a PS layer is limited by several problems.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Fluorescence Resonance Energy Transfer between Quantum Dots and Gold Nanoparticles Based on Porous Silicon Photonic Crystal for DNA Detection

Zhang

Jia

2017

Sensors

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A novel assembled biosensor was prepared for detecting 16S rRNA, a small-size persistent specific for Actinobacteria. The mechanism of the porous silicon (PS) photonic crystal biosensor is based on the fluorescence resonance energy transfer (FRET) between quantum dots (QDs) and gold nanoparticles (AuNPs) through DNA hybridization, where QDs act as an emission donor and AuNPs serve as a fluorescence quencher. Results showed that the photoluminescence (PL) intensity of PS photonic crystal was drastically increased when the QDs-conjugated probe DNA was adhered to the PS layer by surface modification using a standard cross-link chemistry method. The PL intensity of QDs was decreased when the addition of AuNPs-conjugated complementary 16S rRNA was dropped onto QDs-conjugated PS. Based on the analysis of different target DNA concentration, it was found that the decrease of the PL intensity showed a good linear relationship with complementary DNA concentration in a range from 0.25 to 10 μM, and the detection limit was 328.7 nM. Such an optical FRET biosensor functions on PS-based photonic crystal for DNA detection that differs from the traditional FRET, which is used only in liquid. This method will benefit the development of a new optical FRET label-free biosensor on Si substrate and has great potential in biochips based on integrated optical devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Fluorescence Resonance Energy Transfer between Quantum Dots and Gold Nanoparticles Based on Porous Silicon Photonic Crystal for DNA Detection

Zhang

Jia

2017

Sensors

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“…The active area A of the device is 2 mm 2 . AC conductance and capacitance of the samples were measured in the frequency range between 20 Hz and 10 6 Hz using HP 4276A LCR meter in a microprocessor-controlled system. The amplitude of the alternating signal was 100 mV peak-to-peak with no DC bias.…”

Section: Methodsmentioning

confidence: 99%

“…1 Investigations have also been carried into this PS material for its potential applications in the field of optoelectronics, 2,3 drug delivery, 4 gas and biosensors 5,6 and biomedical devices. 7 The study of electrical properties of PS layers therefore becomes important to exploit these developments with further success.…”

Section: Introductionmentioning

confidence: 99%

AC Impedance Studies on Metal/Nanoporous Silicon/p-Silicon Structures

Mabrook

Ray

2016

Journal of Elec Materi

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Alternating current (AC) impedance measurements have been performed on 10-to 15-lm thick porous silicon layers on a (100) p-type silicon (p(+)Si) substrate with the aluminium (Al) top electrode in a sandwich configuration in the range of 20 Hz-1 MHz and in the temperature ranging between 152 K and 292 K. The ac conductivity r ac was found to increase with frequency f according to the universal power law: r ac ¼ Af s where the exponent s is a frequency and temperature-dependent quantity. A hopping process is found to be dominant at low temperatures and high frequencies, while a thermally activated free band process is responsible for conduction at higher temperatures. Capacitance is found to decrease with frequency but increase with temperature. Frequency dependence of the loss tangent is observed with a temperature-dependent minimum value.

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“…This technique allows for us to design multilayer structures that are based on porous silicon, like distributed Bragg reflectors (DBRs) [ 1 , 2 , 3 ], rugate filters [ 3 , 4 ], and microcavities (MC) [ 5 , 6 , 7 ]. Furthermore, due to the high internal surface area of Psi, all of the devices mentioned above are good candidates for sensing biological and chemical substances [ 8 , 9 , 10 ] and gas [ 11 , 12 , 13 ]. The microcavities can be obtained for different wavelengths within the Vis-IR range on a silicon substrate.…”

Section: Introductionmentioning

confidence: 99%

Time-Resolved Spectroscopy of Ethanol Evaporation on Free-Standing Porous Silicon Photonic Microcavities

et al. 2018

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In this work, we have followed ethanol evaporation at two different concentrations using a fiber optic spectrometer and a screen capture application with a resolving capacity of 10 ms. The transmission spectra are measured in the visible-near-infrared range with a resolution of 0.5 nm. Porous Silicon microcavities were fabricated by electrochemistry etching of crystalline silicon. The microcavities were designed to have a localized mode at 472 nm (blue band). Ethanol infiltration produces a redshift of approximately 17 nm. After a few minutes, a phase change from liquid to vapor occurs and the localized wavelength shifts back to the blue band. This process happens in a time window of only 60 ms. Our results indicate a difference between two distinct ethanol concentrations (70% and 35%). For the lower ethanol concentration, the blue shift rate process is slower in the first 30 ms and then it equals the high ethanol concentration blue shift rate. We have repeated the same process, but in an extended mode (750 nm), and have obtained similar results. Our results show that these photonic structures and with the spectroscopic technique used here can be implemented as a sensor with sufficient sensitivity and selectivity. Finally, since the photonic structure is a membrane, it can also be used as a transducer. For instance, by placing this photonic structure on top of a fast photodetector whose photo-response lies within the same bandwidth, the optical response can be transferred to an electrical signal.

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Electrostatic gas sensor with a porous silicon diaphragm

Cited by 14 publications

References 22 publications

Efficient Fluorescence Resonance Energy Transfer between Quantum Dots and Gold Nanoparticles Based on Porous Silicon Photonic Crystal for DNA Detection

Efficient Fluorescence Resonance Energy Transfer between Quantum Dots and Gold Nanoparticles Based on Porous Silicon Photonic Crystal for DNA Detection

AC Impedance Studies on Metal/Nanoporous Silicon/p-Silicon Structures

Time-Resolved Spectroscopy of Ethanol Evaporation on Free-Standing Porous Silicon Photonic Microcavities

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