Hydrophobic Polydimethylsiloxane (PDMS) Coating of Mesoporous Silica and Its Use as a Preconcentrating Agent of Gas Analytes

• DOI: 10.1021/la502915r
• Publication Date: 2014-08-07T16:51:55Z
• Authors: Eun Ji Park; Youn Kyoung Cho; Dae Han Kim; Myung-Geun Jeong; Yong Ho Kim; Young Dok Kim
• Keywords: Polydimethylsiloxane; Thermal desorption; Hydrophobic silica

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 pores larger than ∼8 can be thin layers PDMS, and surfaces consisting PDMS-coated were superhydrophobic, water contact angles close to 170°. used as adsorbents various gas-phase chemical warfare agent (CWA) simulants. allowed molecular desorption CWA simulants even after exposure under highly humid conditions and, therefore, is applicable an for preconcentration analytes enhance sensitivities sensors.