[논문]Chemical Sensors Based on Distributed Bragg Reflector Porous Silicon Smart Particles

Sohn, Honglae

doi:10.13160/ricns.2015.8.1.67

Chemical Sensors Based on Distributed Bragg Reflector Porous Silicon Smart Particles 원문보기

Journal of the Chosun Natural Science = 조선자연과학논문집, v.8 no.1, 2015년, pp.67 - 74

Sohn, Honglae (Department of Chemistry, Chosun University)

Abstract ▼ AI-Helper

Sensing characteristics for porous smart particle based on DBR smart particles were reported. Optically encoded porous silicon smart particles were successfully fabricated from the free-standing porous silicon thin films using ultrasono-method. DBR PSi was prepared by an electrochemical etch of heavily doped $p^{++}$-type silicon wafer. DBR PSi was prepared by using a periodic pseudo-square wave current. The surface-modified DBR PSi was prepared by either thermal oxidation or thermal hydrosilylation. Free-standing DBR PSi films were generated by lift-off from the silicon wafer substrate using an electropolishing current. Free-standing DBR PSi films were ultrasonicated to create DBR-structured porous smart particles. Three different surface-modified DBR smart particles have been prepared and used for sensing volatile organic vapors. For different types of surface-modified DBR smart particles, the shift of reflectivity mainly depends on the vapor pressure of analyte even though the surfaces of DBR smart particles are different. However huge difference in the shift of reflectivity depending on the different types of surface-modified DBR smart particles was obtained when the vapor pressures are quite similar which demonstrate a possible sensing application to specify the volatile organic vapors.

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제안 방법

The morphology of DBR smart dust was observed with cold field emission scanning electron microscope (FE-SEM, S-4800, Hitachi). DBR smart particle was measured by interferometric reflectance spectra were recorded by using an Ocean Optics S2000 spectrometer fitted with a bifurcated fiber optic probe. Spectra were recorded with a CCD detector in the wavelength range 400~1200 nm.

대상 데이터

For analyte exposure studies, n-hexane, benzene, and methanol (98.5%, Aldrich), were purchased. Stock solutions of the molecules were prepared by freeze-pump-thaw degassed three times prior to use.
Two types of DBR PSi were prepared in this study. (1) Fresh H-terminated DBR PSi, (2) Dodecyl-derivatized DBR PSi; freshly etched DBR PSi chip was placed in 250 mL of schlenk flask under argon atmosphere.

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Chemical Sensors Based on Distributed Bragg Reflector Porous Silicon Smart Particles 원문보기

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Chemical Sensors Based on Distributed Bragg Reflector Porous Silicon Smart Particles 원문보기

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