title: Adsorption and desorption characteristics of gradient distributed Bragg reflector porous silicon layers.
abstract: Adsorption and desorption characteristics of gradient distributed Bragg reflector (DBR) porous silicon (PSi) were investigated under the exposure of organic vapors. Gradient DBR PSi whose average pore size decreased as the lateral distance from the Pt electrode increased was generated by using an asymmetric etching configuration. The reflection resonances were measured as a function of lateral distance from a point closest to the plate Pt electrode to a position on the silicon surface. Two types of gradient DBR PSi (H- and HO-terminated gradient DBR PSi) were used in this study. The detection of volatile organic compounds (VOCs) using the gradient DBR PSi had been achieved. When the vapor of VOCs condensed in the nanopores, the gradient DBR PSi modified with hydrophobic and hydrophilic functionality exhibited different pore adsorption and desorption characteristics.
authors: Department of Chemistry, Chosun University, Gwangju 501-759, Korea.
authors: Sungyong
authors: S
authors: Um
authors: Sung Gi
authors: SG
authors: Lee
authors: Hee-Gweon
authors: HG
authors: Woo
authors: Sungdong
authors: S
authors: Cho
authors: Honglae
authors: H
authors: Sohn
mesh_terms: D000042:Absorption; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D016062:Porosity; D012031:Refractometry / Q000295:instrumentation*; D012825:Silicon / Q000737:chemistry*; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000737:chemistry
chemical_list: D055549:Volatile Organic Compounds; D012825:Silicon