期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 11, 期 16, 页码 2316-2321出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201600818
关键词
cyanines; dyes/pigments; electrospinning; fibrous mats; sensors
资金
- National Natural Science Foundation of China [21574009, 51521062]
- Beijing Natural Science Foundation [2142026]
- Beijing Collaborative Innovative Research Center for Cardiovascular Diseases
- Innovation and Promotion Project of Beijing University of Chemical Technology
Electrospun ultrathin fiber-based sensors are desirable because of their practicality and sensitivity. Ammonia-detection systems are in high demand in different areas, including the industrial and agricultural fields. However, current technologies rely on large and complex instruments that restrict their actual utilization. Herein, we report a flexible naked-eye ammonia sensor, the polylactic acid-cyanine (PLA-Cy) fibrous mat, which was fabricated by blending a carboxyl-functionalized cyanine dye (D1) into electospun PLA porous fibers. The sensing mat was shown to undergo a naked-eye-detectable color change from white to blue upon exposure to ammonia vapor. The mat showed high selectivity to ammonia gas with a detection limit of 3.3 ppm. Aggregated D1 was first encapsulated by PLA and was then ionized by NH3. These mechanisms were examined by photophysical studies and scanning electron microscopy. The aggregation-deaggregation process of D1 in the PLA-Cy fibrous mat led to the color change. This work provides a facile method for the naked-eye detection of ammonia and a novel strategy for the use of organic dyes in ammonia sensing.
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