Stimuli-Responsive Luminescent Copper Nanoclusters in Alginate and Their Sensing Ability for Glucose.
ACS Appl Mater Interfaces
; 11(6): 6561-6567, 2019 Feb 13.
Article
em En
| MEDLINE
| ID: mdl-30656937
ABSTRACT
Visually observable pH-responsive luminescent materials are developed by integrating the properties of aggregation-induced emission enhancement of Cu nanoclusters (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 × 10-5 M.
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Base de dados:
MEDLINE
Assunto principal:
Cobre
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Alginatos
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Nanopartículas Metálicas
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Glucose
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Medições Luminescentes
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article