title: Mesoporous thin-film on highly-sensitive resonant chemical sensor for relative humidity and CO2 detection.
abstract: Distributed sensing of gas-phase chemicals is a promising application for mesoporous materials when combined with highly sensitive miniaturized gas sensors. We present a direct application of a mesoporous silica thin film on a highly sensitive miniaturized resonant chemical sensor with a mass sensitivity at the zeptogram scale for relative humidity and CO(2) detection. Using mesoporous silica thin-film, we report one of the lowest volume resolutions and a sensitive detection of 5.1 × 10(-4)% RH/Hz to water vapor in N(2), which is 70 times higher than a device with a nontemplated silica layer. In addition, a mesoporous thin-film that is functionalized with an amino-group is directly applied on the resonant sensor, which exhibits a volume sensitivity of 1.6 × 10(-4)%/Hz and a volume resolution of 1.82 × 10(-4)% to CO(2) in N(2).
authors.forename: Hyunjoo J
authors.initials: HJ
authors.lastname: Lee
authors.forename: Kwan Kyu
authors.initials: KK
authors.lastname: Park
authors.forename: Mario
authors.initials: M
authors.lastname: Kupnik
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Melosh
authors.forename: Butrus T
authors.initials: BT
authors.lastname: Khuri-Yakub