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http://dx.doi.org/10.5757/JKVS.2007.16.2.099

Dual Photonic Transduction of Porous Silicon for Sensing Gases  

Koh, Young-Dae (Department of Chemistry, Chosun University)
Kim, Sung-Jin (Department of Chemistry, Chosun University)
Jang, Seung-Hyun (Department of Chemistry, Chosun University)
Park, Cheol-Young (Department of Chemistry, Chosun University)
Sohn, Hong-Lae (Department of Chemistry, Chosun University)
Publication Information
Journal of the Korean Vacuum Society / v.16, no.2, 2007 , pp. 99-104 More about this Journal
Abstract
Porous silicon exhibiting dual optical properties, both $Febry-P{\acute{e}}rot$ fringe (optical reflectivity) and photoluminescence had been developed and used as chemical sensors. Porous silicon samples were prepared by an electrochemical etch of p-type silicon wafer (boron-doped, <100> orientation, resistivity ; $1-10{\Omega}cm$). Two different types of porous silicon, fresh porous silicon (Si-H terminated) and oxidized porous silicon (Si-OH terminated)by the thermal oxidation, were prepared. Then the samples were exposed to the vapor of various organics, such as methanol, acetone, hexane, and toluene. Both reflectivity and photoluminescence were simultaneously measured under the exposure of organic vapors for sensing VOC's. These surface-modified samples showed unique respond in both reflectivity and photoluminescence with various organic vapors. While polar molecules exhibit greater quenching photoluminescence, molecules having higher vapor pressure show greater red shift for reflectivity.
Keywords
$Febry-P{\acute{e}}rot$ fringe pattern; Photoluminescence; Porous Silicon; Thermal oxidation;
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