Optical measurement of trace level water vapours using functionalized porous silicon: selectivity studies

摘要: Selective detection of trace level water vapours by functionalized porous silicon (PS) using photoluminescence (PL) quenching technique is reported. This sensitive provides sensing data through optical probing on a surface with submicron area. PS samples were prepared via electrochemical etching and ammonium sulphide UV exposure which brought about major changes in the properties. Samples examined SEM, FTIR, contact angle PL spectroscopy. These tested as sensors presence linear aliphatic alcohols wide range 0–400 ppm. An increasing trend sensor response increase alcohol chain length minimal to was observed from based as-anodized whereas post functionalization, portrayed an opposite wherein selective indicated. The role nitridation highlighted vapours. A correlation between chemistry has been established. It implicated that directly linked both chemical properties analytes. highly for at low ppm presented. simple compact design portable sensors, applicable vapour proposed.