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

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...

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Detalles Bibliográficos
Autores principales: Zhang, Qi, Castro Smirnov, Jose R., Xia, Ruidong, Pedrosa, Jose M., Rodriguez, Isabel, Cabanillas-Gonzalez, Juan, Huang, Wei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5384246/
https://www.ncbi.nlm.nih.gov/pubmed/28387354
http://dx.doi.org/10.1038/srep46265
Descripción
Sumario: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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