Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 413, Issue 6, Pages 1739-1747Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-020-03144-z
Keywords
Perovskite quantum dots; PS-PAA microspheres; pH sensing; Urea/urease monitoring
Funding
- Chongqing Entrepreneurship and Innovation Support Program [CX201803]
- China Fundamental Research Funds for the Central Universities [2019CDQYGD020, 2019CDCGGD304, 2020CDJGFCG006]
- National Key Research and Development Program of China [2016YFC0101100, 2016YFE0125200]
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In this study, CsPbBr3 perovskite quantum dots were successfully encapsulated in poly(styrene/acrylamide) microspheres, creating PDPS composites with stable photoluminescence and water solubility. These composites were used to construct a real-time pH monitoring platform that showed a good linear relationship within the pH range of 4-12 and was further extended for urea and urease detection. The detection limits for urea and urease were found to be 1.67 μM and 2.1 mU/mL, respectively, demonstrating the expanding applications of perovskite materials.
Perovskite materials have attracted attention due to their excellent optical and electrical properties; however, their unsatisfactory stability limits their application in biochemical detection. In this paper, CsPbBr3 perovskite quantum dots were successfully encapsulated in poly(styrene/acrylamide) microspheres, using a swelling-shrinking method. The manufactured perovskite microspheres (PDPS composites) not only maintained strong photoluminescence (PL) stability but also demonstrated great water solubility. Additionally, a real-time pH monitoring platform was constructed based on the prepared PDPS composites and dopamine, and the system showed a good linear relationship in a pH range of 4-12. Furthermore, urea could be hydrolyzed to produce hydroxyl groups, thereby increasing the pH of the solution. Therefore, this system was then extended for urea and urease detection. As a result, the detection limits of urea and urease were recorded as 1.67 mu M and 2.1 mU/mL, respectively. This development provides an interesting demonstration of the expanding list of applications of perovskite materials.
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