1. Highly pH-responsive sensor based on amplified spontaneous emission coupled to colorimetry.
- Author
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Zhang, Qi, Castro Smirnov, Jose R., Xia, Ruidong, Pedrosa, Jose M., Rodriguez, Isabel, Cabanillas-Gonzalez, Juan, and Huang, Wei
- 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. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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