Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 6, Pages 6561-6567Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b20835
Keywords
stimuli-responsive materials; alginate; photoluminescence; metal nanoclusters; aggregation-induced emission; glucose
Funding
- National Natural Science Foundation of China [21804030, 21778047]
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Visually observable pH-responsive luminescent materials are developed by integrating the properties of aggregation-induced emission enhancement of Cu nano-clusters (NCs) and the Ca2+-triggered gelatin of alginate. Sodium alginate, CaCO3 nanoparticles, and Cu NCs are dispersed in aqueous solution, which is in a transparent fluid state, showing weak photoluminescence (PL). The introduced H+ can react with the CaCO3 nanoparticles to produce free Ca2+, which can cross-link the alginate chains into gel networks. Meanwhile, a dramatic increase in the PL intensity of Cu NCs and a blue shift in the PL peak appeared, assigned to the Ca2+-induced enhancement and gelatin-induced enhancement, respectively. Their potential application as a sensor for glucose is also demonstrated based on the principle that glucose oxidase can recognize glucose and produce H+, which further triggers the above-mentioned two-stage enhancement. A linear relationship between the PL intensity and the concentration of glucose in the range of 0.1-2.0 mM is obtained, with the limit of detection calculated as 3.2 X 10(-5) M.
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