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Sci Rep. 2017 Apr 7;7:46265. doi: 10.1038/srep46265.

Highly pH-responsive sensor based on amplified spontaneous emission coupled to colorimetry.

Author information

1
Key Laboratory for Organic Electronics and Information Displays &Institute of Advanced Materials, National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210046, China.
2
Madrid Institute for Advanced Studies, IMDEA Nanociencia, Calle Faraday 9, Ciudad Universitaria de Cantoblanco, 28049, Spain.
3
Department of Physical, Chemical and Natural System, Universidad Pablo de Olavide, Seville, ES 41013, Spain.
4
Institute of Advanced Materials (IAM), Jiangsu-Singapore Joint Research Center for Organic/Bio-Electronics &Information Displays, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China.

Abstract

We demonstrated a simple, directly-readable approach for high resolution pH sensing. The method was based on sharp changes in Amplified Spontaneous Emission (ASE) of a Stilbene 420 (ST) laser dye triggered by the pH-dependent absorption of Bromocresol Green (BG). The ASE threshold of BG:ST solution mixtures exhibited a strong dependence on BG absorption, which was drastically changed by the variations of the pH of BG solution. As a result, ASE on-off or off-on was observed with different pH levels achieved by ammonia doping. By changing the concentration of the BG solution and the BG:ST blend ratio, this approach allowed to detect pH changes with a sensitivity down to 0.05 in the 10-11 pH range.

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