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    Effect of polydimethylsiloxane (PDMS) coating on TiO2-based MALDI matrix for dimethyl methylphosphonate (DMMP) analysis

    Year: 2015

    Journal: APPLIED SURFACE SCIENCE, Vol. 353, p 342-349, 20170208

    Authors: Park, Eun Ji; Han, Sang Wook; Jeong, Bora; Park, Seon Hwa; Kim, Yang-Gyun; Kim, Yong Ho; Kim, Young Dok

    Organizations: Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea; Sungkyunkwan Univ, SKKU Adv Inst Nanotechnol SAINT, Suwon 440746, South Korea

    TiO2 nanoparticles were used as MALDI matrix for detecting dimethyl methylphosphate (DMMP) and its efficiency, in terms of DMMP signal intensity in the MALDI-MS analysis, was compared with that of polydimethylsiloxane (PDMS)-coated TiO2 matrix. Intensity of the DMMP signal in the MALDI-MS analysis was significantly increased by using PDMS-coated TiO2 matrix instead of bare ones. It was verified using FT-IR that the enhanced DMMP signal upon PDMS coating on TiO2 matrix is a result of weaker interactions between DMMP molecule and the PDMS-covered surface than that of bare TiO2. A weaker DMMP-matrix interaction can facilitate desorption of DMMP from the matrix surface in the MALDI process, yielding a higher sensitivity to DMMP in the MALDI-MS. (C) 2015 Elsevier B.V. All rights reserved.