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Chemical and Physical Properties of Porous Silicon
Jang, Seunghyun The Basic Science Institute Chosun University 2011 조선자연과학논문집 Vol.4 No.1
The properties of porous silicon, such as substrate properties, porosity, thickness, refractive index, surface area, and optical properties of porous silicon were reviewed. Some properties, such as porosity, refractive index, thickness, pore diameter, multi-structures, and optical properties, are strongly dependent on the anodization process parameters. These parameters include HF concentration, current density, anodization time, and silicon wafer type and resistivity.
Multi-Encoded Rugate Porous Silicon as Nerve Agents Sensors
Jang, Seunghyun,Kim, Jihoon,Koh, Youngdae,Ko, Young Chun,Woo, Hee-Gweon,Sohn, Honglae American Scientific Publishers 2007 Journal of Nanoscience and Nanotechnology Vol.7 No.11
<P>The nanostructured rugate porous silicons (PSi) containing multiple photonic band gaps have been generated by an electrochemical etching through applying a composite waveform summed three computer-generated pseudo-sinusoidal current waveforms. They exhibit three sharp photonic band gaps in the optical reflectivity spectrum, corresponding to the each of the sine components varied from 0.42, 0.36, and 0.30 Hz, with a spacing of 0.06 Hz between each sine component. The sensing experiments using multi-encoded rugate PSi for the detection of nerve agents such as triethyl phosphate (TEP), diethyl chlorophosphate (DCP), dimethyl methylphosphonate (DMMP), and diethyl ethylphosphonate (DEEP) have been achieved. Capillary condensation in the pores causes the reflectivity of rugate PSi to shift to longer wavelengths due to an increase in refractive indices of the porous medium.</P>
Seunghyun Jang,Honglae Sohn,Jihoon Kim,Youngdae Koh 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2
Distributed Bragg reflector (DBR) porous silicon (PSi) chips with two reflection peaks were fabricated by electrochemical etching in an aqueous ethanolic HF solution and were used to detect of chemical nerve agent simulants. Dimethyl methylphosphonate (DMMP) is a simulant for G-type nerve agents. The manufactured DBR PSi chips exhibit two sharp photonic bands, 560 and 717 nm, with narrow full widths at half maximum (FWHM) of 15 and 20 nm, respectively. The detection method involved the shift of the DBR reflection peaks in the reflectivity spectra under exposure to vapors of the analyte. Rapid detection was achieved in few seconds in situ and the observed red shift of the DBR peaks resulted from an increase in the refractive indices in DBR PSi. When the DBR PSi chips were exposed to vapor of DMMP, the two reflection peaks from DBR PSi were red-shifted by 22 and 32 nm, respectively. Real-time detection for the stimulant indicated that the detection measurements were reversible. Detection of other analytes, such as triethyl phosphate (TEP) and diethyl ethylphosphonate (DEEP), has been also achieved. Distributed Bragg reflector (DBR) porous silicon (PSi) chips with two reflection peaks were fabricated by electrochemical etching in an aqueous ethanolic HF solution and were used to detect of chemical nerve agent simulants. Dimethyl methylphosphonate (DMMP) is a simulant for G-type nerve agents. The manufactured DBR PSi chips exhibit two sharp photonic bands, 560 and 717 nm, with narrow full widths at half maximum (FWHM) of 15 and 20 nm, respectively. The detection method involved the shift of the DBR reflection peaks in the reflectivity spectra under exposure to vapors of the analyte. Rapid detection was achieved in few seconds in situ and the observed red shift of the DBR peaks resulted from an increase in the refractive indices in DBR PSi. When the DBR PSi chips were exposed to vapor of DMMP, the two reflection peaks from DBR PSi were red-shifted by 22 and 32 nm, respectively. Real-time detection for the stimulant indicated that the detection measurements were reversible. Detection of other analytes, such as triethyl phosphate (TEP) and diethyl ethylphosphonate (DEEP), has been also achieved.
Smart Particles Containing Multiple Rugate-structured Photonic Crystal
Jang, Seunghyun The Basic Science Institute Chosun University 2012 조선자연과학논문집 Vol.5 No.4
The rugate porous silicons containing multiple photonic band gaps have been generated by applying a composite waveform summed three computer-generated pseudo-sinusoidal current waveforms and exhibit three sharp photonic band gaps in the optical reflectivity spectrum. Generated multiple rugate porous silicons display three rugate peaks corresponding to the each of the sine components varied from 0.42, 0.36, and 0.30 Hz, with a spacing of 0.06 Hz between each sine component. The resulting rugate PSi films have been removed from the silicon substrate by applying an lift-off current and are then made into particles by ultrasono-method in a organic solution. The sensing experiments using these particles for organic solvents such as toluene, hexane, acetone, and methanol have been achieved. Condensing of organic vapors in the pores increases the refractive indices of entire particle which results a red shift in the photonic peaks.