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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/124522

    Title: Creating liquid crystal microdroplet arrays for multiplexed sensing by spatially-controlled molecular patterning
    Authors: Chen, Chih-hsin
    Keywords: Molecular patterning;Liquid crystal;Liquid crystal-based sensors;Microdroplets array;Metal ions detection
    Date: 2023-07-06
    Issue Date: 2023-09-18 12:05:24 (UTC+8)
    Publisher: Elsevier
    Abstract: In this study, we presented a spatially-controlled molecular patterning technique to prepare liquid crystal (LC) microdroplet arrays on glass substrates. This technique utilizes an oxygen plasma activated PDMS stamp to remove the pre-coated dimethyloctadecyl 3-(trimethoxysilyl) propyl ammonium chloride (DMOAP) molecules from glass substrates, producing a surface with complementary patterns and specific hydrophobicity. When LC molecules are introduced onto this produced molecular pattern, a LC microdroplet array with uniform droplet size and positional order is formed. By using the LC microdroplet array doped with a Hg2+ selective ligand, the lowest detectable concentration of Hg2+ is 200-fold lower than that of conventional LC-based sensors. In addition, multiplexed detection of Hg2+, Al3+, Fe3+ and pH value in real water samples with a high recovery rate (∼100%) was demonstrated by using the LC microdroplet arrays doped with different molecular probes. Due to the specific arrangement of the LC microdroplet arrays, the collected optical signal of LC microarrays can be transformed into numerical symbols. The developed spatially controlled molecular patterning technique could be used to prepare highly uniform LC microdroplet arrays with consistent optical signals, providing a simple method to prepare the LC-based sensing platforms with improved sensing performance.
    Relation: Sensors and Actuators B: Chemical 393, 134253
    DOI: 10.1016/j.snb.2023.134253
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

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