title: Hydrophobic polydimethylsiloxane (PDMS) coating of mesoporous silica and its use as a preconcentrating agent of gas analytes.
abstract: Mesoporous silica with mean pore size of ∼14 nm was coated by polydimethylsiloxane (PDMS) using a thermal deposition method. We showed that the inner walls of pores larger than ∼8 nm can be coated by thin layers of PDMS, and the surfaces consisting of PDMS-coated silica were superhydrophobic, with water contact angles close to 170°. We used the PDMS-coated silica as adsorbents of various gas-phase chemical warfare agent (CWA) simulants. PDMS-coated silica allowed molecular desorption of various CWA simulants even after exposure under highly humid conditions and, therefore, is applicable as an agent for the preconcentration of gas-phase analytes to enhance the sensitivities of various sensors.
authors.affiliation: Department of Chemistry and ‡SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University , Suwon 440-746, Republic of Korea.
authors.forename: Eun Ji
authors.initials: EJ
authors.lastname: Park
authors.forename: Youn Kyoung
authors.initials: YK
authors.lastname: Cho
authors.forename: Dae Han
authors.initials: DH
authors.lastname: Kim
authors.forename: Myung-Geun
authors.initials: MG
authors.lastname: Jeong
authors.forename: Yong Ho
authors.initials: YH
authors.lastname: Kim
authors.forename: Young Dok
authors.initials: YD
authors.lastname: Kim