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Infrared Glass–Ceramics With Fine Porous Surfaces for Optical Sensor Applications
Author(s) -
Delaizir Gaelle,
Lucas Pierre,
Zhang Xianghua,
Ma Hongli,
Bureau Bruno,
Lucas Jacques
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01675.x
Subject(s) - materials science , porosity , nucleation , etching (microfabrication) , nanometre , porous glass , infrared , silane , ceramic , composite material , coating , optics , chemistry , physics , organic chemistry , layer (electronics)
GeS 2 –Sb 2 S 3 –CsCl glass–ceramics with fine porous surfaces were synthesized and tested as optical elements. The porosity is obtained through a two‐step process, including controlled nucleation of CsCl nuclei in the glass matrix followed by selective etching of the nuclei with an acid solution. The porous surface is several hundred nanometers thick and results in a surface area increase of almost four orders of magnitude. The pores size is approximately 150 nm and can be tailored by controlling the nucleation process and the etching time. It is shown that the creation of the porous surface does not critically affect the optical transmission of these infrared (IR) transparent glass–ceramics. These materials can therefore be used for the design of optical elements and an attenuated total reflexion plate with porous surface was fabricated and tested as an optical IR sensor. The porous element shows higher detection sensitivity in initial experiments with an analyte sprayed at the plate surface and a coating of silane molecules.