DBR-structured smart particles for sensing applications

Kim, Sung Gi; Kim, Sung‐Soo; Ko, Young Chun; Cho, Sungdong; Sohn, Honglae

doi:10.1016/j.colsurfa.2007.04.119

Cited by 17 publications

(9 citation statements)

References 17 publications

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“…The results show that different organic vapors result in the resonant shifts at different extents. Overall, the shifts are caused by the increased average refractive indices of the porous medium that are the result of the partial substitution of air by the organic liquid phase in the pores of each layer due to capillary condensation effect [33].…”

Section: Thermally-oxidized Psm Chips For Organic Vapors Detectionmentioning

confidence: 99%

Optical characteristics and environmental pollutants detection of porous silicon microcavities

Huang

Chen

et al. 2011

Sci. China Chem.

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Porous silicon microcavities (PSM) optical crystals consisting of a Fabry-Perot microcavity embedded between two distributed Bragg reflectors have been fabricated by electrochemical etching. Scanning electron microscopy (SEM) clearly depicted their physical sandwich construction. The optical feature of the PSM structure was tuned by varying the anodization parameters. Through proper thermal oxidation and surface chemical modifications, the resulting structures were employed as optical sensors for the detection of environmental pollutants including volatile organic vapors (i.e. acetonitrile, toluene, cyclohexane, chloroform, acetone and ethanol) and interior decoration gases (i.e. toluene, ammonia and formaldehyde). Fourier transform infrared spectroscopy (FTIR) spectra confirmed the effective thermal annealing and surface modification chemistry, and the sensing process was accompanied by recording the modified structures' optical responses when exposed to target analytes. The PSM optical sensors showed good stability, sensitivity and selectivity, implying promising applications in gas sensing and environmental monitoring.porous silicon microcavity, optical sensor, thermal oxidation, surface modification, environmental pollutants detection

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Section: Thermally-oxidized Psm Chips For Organic Vapors Detectionmentioning

confidence: 99%

Optical characteristics and environmental pollutants detection of porous silicon microcavities

Huang

Chen

et al. 2011

Sci. China Chem.

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“…9 Typically, PS prepared under the dark condition exhibits well defined Fabry-Pérot fringes in the optical reflectivity spectrum. Sensing molecules such as toxic gases, [10][11][12] solvents, 13 DNA, 3 and proteins, 14 15 can lead to a shift in the reflection resonance by modification of the refractive index of PS. Luminescent PS can be usually prepared by a galvanostatic photoetch of n-type silicon wafer.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence Enhancement of Silole-Capped Silicon Quantum Dots Based on Förster Resonance Energy Transfer

Kim¹,

Kim²,

Ko³

et al. 2015

j nanosci nanotechnol

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Photoluminescent porous silicon were prepared by an electrochemical etch of n-type silicon under the illumination with a 300 W tungsten filament bulb for the duration of etch. The red photoluminescence emitting at 650 nm with an excitation wavelength of 450 nm is due to the quantum confinement of silicon quantum dots in porous silicon. HO-terminated red luminescent PS was obtained by an electrochemical treatment of fresh PS with the current of 150 mA for 60 seconds in water and sodium chloride. As-prepared PS was sonicated, fractured, and centrifuged in toluene solution to obtain photoluminescence silicon quantum dots. Dichlorotetraphenylsilole exhibiting an emission band at 520 nm was reacted with HO-terminated silicon quantum dots to give a silole-capped silicon quantum dots. The optical characterization of silole-derivatized silicon quantum dots was investigated by UV-vis and fluorescence spectrometer. The fluorescence emission efficiency of silole-capped silicon quantum dots was increased by about 2.5 times due to F6rster resonance energy transfer from silole moiety to silicon quantum dots.

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“…9 Typically, PS exhibiting a well-defined reflection peak in the optical reflectivity spectrum can be prepared with p-type silicon wafer under the dark condition. Detection of molecules such as toxic gases, [10][11][12] organic solvents, 13 DNA, 3 and proteins 14 15 can lead to a shift of reflection peak due to a change in the refractive index of PS. Luminescent PS samples are usually prepared by a galvanostatic photoetch of n-type silicon wafer under the illumination condition.…”

Section: Introductionmentioning

confidence: 99%

Detection of Organic Vapors Based on Photoluminescent Bragg-Reflective Porous Silicon Interferometer

Ahn¹,

Cho²,

Kim³

et al. 2015

j nanosci nanotechnol

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Novel photoluminescent Bragg-reflective porous silicon, exhibiting dual optical properties, both the optical reflectivity and photoluminescence, was developed and used for sensing organic vapors. Photoluminescent Bragg-reflective porous silicon samples were prepared by an electrochemical etch of n-type silicon under the illumination. The etching solution consisted of a 3:1 volume mixture of aqueous 48% hydrofluoric acid and absolute ethanol. The typical etch parameters for the generation of photoluminescent Bragg-reflective porous silicon involved a periodic square wave current with 50 repeats. The surface of photoluminescent Bragg-reflective porous silicon was characterized by a FT-IR spectroscopy. Both reflectivity and photoluminescence were simultaneously measured under the exposure of organic vapors. The shift of reflection band to the longer wavelength and the quenching of photoluminescence under the exposure of various organic vapors were observed.

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DBR-structured smart particles for sensing applications

Cited by 17 publications

References 17 publications

Optical characteristics and environmental pollutants detection of porous silicon microcavities

Optical characteristics and environmental pollutants detection of porous silicon microcavities

Photoluminescence Enhancement of Silole-Capped Silicon Quantum Dots Based on Förster Resonance Energy Transfer

Detection of Organic Vapors Based on Photoluminescent Bragg-Reflective Porous Silicon Interferometer

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