Detection of nerve agent stimulants based on photoluminescent porous silicon interferometer
Department of Chemistry, Chosun University, 375 Seosuk-dong, Dong-gu, Gwangju 501-759, South Korea
Nanoscale Research Letters 2012, 7:527 doi:10.1186/1556-276X-7-527Published: 25 September 2012
Porous silicon (PSi) exhibiting dual optical properties, both Fabry-Pérot fringe and photolumincence, was developed and used as chemical sensors. PSi samples were prepared by an electrochemical etch of p-type silicon under the illumination of 300-W tungsten lamp during the etch process. The surface of PSi was characterized by cold field-emission scanning electron microscope. PSi samples exhibited a strong visible orange photoluminescence at 610 nm with an excitation wavelength of 460 nm as well as Fabry-Pérot fringe with a tungsten light source. Both reflectivity and photoluminescence were simultaneously measured under the exposure of organophosphate vapors. An increase of optical thickness and quenching photoluminescences under the exposure of various organophosphate vapors were observed.