Detection of organophosphates based on surface-modified DBR porous silicon using LED light

Jang, Seunghyun; Koh, Youngdae; Kim, Jihoon; Park, Jaehyun; Park, Cheolyoung; Kim, Sung Jin; Cho, Sungdong; Ko, Young Chun; Sohn, Honglae

doi:10.1016/j.matlet.2007.06.009

Cited by 33 publications

(25 citation statements)

References 20 publications

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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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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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“…3 4 In recent years, highly sensitive optical sensing has been achieved with a variety of PS structures, including Fabry-Perot films, 5 Bragg mirrors, 6-8 microcavities, 9 and rugate filters. 10 PS employs to detect a wide range chemical and biological compounds, including volatile organic vapors, 11 explosives, 12 chemical nerve agents, 13 DNA, 14 and proteins, 15 due to their large surface area, easy surface chemistries. 16 Multi-encoded rugate filters were recently developed by applying a computer-generated pseudo-sinusoidal composite current-time waveform.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Optical Characterization of Multi-Encoded Rugate Porous Silicon/Polymer Composite

Cho¹,

Lee²,

Woo³

et al. 2014

j nanosci nanotechnol

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Multi-encoded rugate porous silicon (MRPS)/polystyrene composite films were fabricated by using a free-standing multi-encoded rugate PS and polystyrene. MRPS exhibiting three reflection resonances was generated by an electrochemical etching of silicon wafer using a composite waveform summed three computer-generated pseudo-sinusoidal current waveforms, which were corresponded to the each of the sine components varied from 0.40, 0.38, to 0.36 Hz, with a spacing of 0.02 Hz between each sine component. They displayed three sharp photonic reflection resonances in the optical reflectivity spectrum. MRPS/polymer composite films obtained by casting of polystyrene polymer solution exhibited excellent photonic characteristics and robust structure upon flexing. For a possible application as VOCs sensor, these films were served for the detection of organic vapors such hexane and methanol.

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“…Since the discovery of porous silicon (PSi) [1] , it has been intensively investigated for a variety of applications such as chemical and biological sensors, medical diagnostics, and drug delivery [2][3][4][5][6][7][8][9][10][11][12][13][14] . The morphology and optical properties depend on surface orientation, doping level and type, temperature, the current density, and the composition of the etching solution [15][16][17][18][19][20][21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Flexible Optical Composite Films Based on Bragg-Structured Interferometer

Um¹,

Sohn²

2013

Journal of the Chosun Natural Science

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Three types of functionalized flexible optical composite films based on Bragg structure porous silicon interferometer have been successfully fabricated by casting a toluene solution of polystyrene onto the free-standing porous silicon. The optical properties of composite films are measured. Surface functionalization of porous silicon is determined by FT-IR measurement. Reflectance and transparence properties of composite films are measured for the possible application of tunable optical filter and indicate that the transmission peak occurred at the identical location where the reflection peak appeared.

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Detection of organophosphates based on surface-modified DBR porous silicon using LED light

Cited by 33 publications

References 20 publications

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

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

Fabrication and Optical Characterization of Multi-Encoded Rugate Porous Silicon/Polymer Composite

Preparation and Characterization of Flexible Optical Composite Films Based on Bragg-Structured Interferometer

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