iSense LLC , Mountain View , California 94043 , United States.
Langmuir. 2018 Oct 30;34(43):13014-13024. doi: 10.1021/acs.langmuir.8b02481. Epub 2018 Oct 16.
To create printing substrates for colorimetric sensor arrays, chemically resistant membranes are prepared by coating cellulose filter paper with perfluoroalkoxy (PFA) polymer nanoparticles. A water-based fluorothermoplastic polymer dispersion was diluted with an organic solvent that causes weak aggregation of polymer nanoparticles. The resulting solution improved adhesion between the polymer and the cellulose membrane, providing a more mechanically stable substrate. These PFA polymer-coated substrates demonstrated superior chemical resistance against strong alkalines and had relatively uniform nanoporous structures that substantially improved the printability of a colorimetric sensor array. Finally, colorimetric sensor arrays printed on these substrates were evaluated for the detection of four different toxic industrial chemicals (e.g., ammonia, hydrogen sulfide, nitrogen dioxide, and sulfur dioxide) at or below their permissible exposure limits.
为了制造比色传感器阵列的打印基底，通过将全氟烷氧基（PFA）聚合物纳米粒子涂覆在纤维素滤纸上来制备耐化学试剂的膜。用水基氟热塑性聚合物分散体稀释有机溶剂，导致聚合物纳米粒子的弱聚集。所得溶液改善了聚合物和纤维素膜之间的附着力，提供了更机械稳定的基底。这些 PFA 聚合物涂覆的基底对强碱具有优异的耐化学腐蚀性，并且具有相对均匀的纳米多孔结构，极大地提高了比色传感器阵列的可印刷性。最后，评估了在这些基底上打印的比色传感器阵列对四种不同的有毒工业化学品（例如，氨、硫化氢、二氧化氮和二氧化硫）的检测，其浓度低于允许的暴露极限。
