Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 15, Pages 13098-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b02294
Keywords
Seed-mediated; pH Sensing; Ag2S Quantum dots; Fluorescence imaging; Extremely acidic
Categories
Funding
- National Key Research and Development Program of China [2017YFA0700501]
- National Natural Science Foundation of China [81771878, 81871414]
- China Postdoctoral Science Foundation [2017M612462]
- Fundamental Research Funds for the Central Universities [2016YXMS253, 2017KFXKJC002, 2018KFYXKJC048]
- Youth Foundation of Wuhan Donghu University [2017dhzkO08]
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The value of pH plays an important role in biological systems, and fluorescence pH probes enable noninvasive monitoring of the change and distribution of pH. Here, we introduce a new class of pH probe based on the genetically engineered polypeptide stabilized second near-infrared fluorescence-enhanced core/shell Ag2S quantum dots. The core/shell Ag2S quantum dots synthesized by seed-mediated growth methods showed a good linear relationship between fluorescence intensity and pH value in the range 2.1-7.2. In addition, the core/shell Ag2S quantum dots exhibited excellent reversibility and good biocompatibility, which can serve as multifunctional probes for the imaging and detecting of Gram-negative bacteria without the influence of autofluorescence in the extremely acidic environment.
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