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

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.

SUBMITTER: Zhang Q

PROVIDER: S-EPMC5384246 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature

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

Zhang Qi Q Castro Smirnov Jose R JR Xia Ruidong R Pedrosa Jose M JM Rodriguez Isabel I Cabanillas-Gonzalez Juan J Huang Wei W

Scientific reports 20170407

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 leve ...[more]

PMID: 28387354

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