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소개 및 활동/사업
대한화학회 창립 75주년
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02월 26일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제115회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Ultra-Sensitive Porous Silicon Quantum Dots As an Explosive Sensor
2015년 2월 26일 15시 55분 36초
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4월 15일 (수요일) 16:00~19:00
조선대학교 화학과, Korea
Photoluminescent(PL) 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 PL emitting at 650 nm with an excitation wavelength of 360 nm was due to the quantum confinement effect of silicon quantum dots in porous silicon (PS). Hydroxy-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 fractured by ultra-sonication and centrifuged in toluene solution to obtain PL silicon quantum dots. Chloromethyltetraphenylsilole exhibiting an emission band at 520 nm was reacted with hydroxy-terminated silicon quantum dots to give a silole-capped silicon quantum dots (SiQDs). As prepared silole-capped SiQDs were exposed to two different phases of TNT, RDX, and PETN for sensing which resulted in noticeable quenching of PL. For vapor sensing, silole-capped SiQD was coated on a lens, which then was illuminated by a light excitation source. Vaporized analytes were blown onto the coated lens and was monitored by a complementary metal?oxide?semiconductor (CMOS). PL intensity was recorded by a computer, which showed that when the vapor of the analytes contacted the sensor membrane, PL from the lens quenched promptly and recovered when the supplying of the vapors stopped due to presumably via electron transfer mechanism. This revealed that real time detection of explosive vapors with high sensitivity was feasible. Sensing liquid phase of the analytes was carried out by using UV-vis and fluorescence spectrometer to investigate the changes in fluorescence when different concentrations of analytes are added. By employing stern-volmer constant, we could see that it detected the analytes reliably and rapidly. Lifetime was measured to observe changes in their optical behavior of pre/post-reaction and when introduced to the TNT solution. The result of pre/post-reaction lifetime comparison showed that silole-capped SiQD resembled as-prepared SiQD. With the increase of TNT concentration in silole-capped SiQD solution, the intensity of PL increased however, their lifetime did not change significantly. This research was supported by Agency for Defense Development.
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