Journal
BIOSENSORS & BIOELECTRONICS
Volume 216, Issue -, Pages -Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2022.114664
Keywords
Self-enhanced electrochemiluminescence; Perovskite nanocrystals; Nitrogen doped graphene quantum dot; 2D mesoporousSiO(2) nanosheets; Ochratoxin A detection
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Funding
- National Natural Science Foundation of China [21904055]
- Nature Science Foundation of Fujian province [2020J05164]
- Education -Science Research Project for Young and Middle-aged Teachers of Fujian [JAT210282]
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In this study, a self-enhanced superstructure was constructed to improve the stability and charge transfer efficiency of lead halide perovskites. A new ECL sensor with high affinity for OTA detection was developed.
Lead halide perovskites have become a potential candidate as electrochemiluminescence (ECL) emitters owing to their appealing electronic-to-optical merits. It remains extremely challenging, however, to improve stability and enhance charge transfer. Herein, a self-enhanced superstructures was constructed by successively loading N -doped graphene quantum dot (NGQDs) and CsPbBr3 perovskite nanocrystals (PNCs) onto graphene supported two-dimensional mesoporous SiO2 nanosheets (2D mSiO(2)-G). This special architecture ensures improved stability and accelerated charge transport, leading to efficient self-enhanced ECL between NGQDs and PNCs in a confined mesoporous structure. Additionally, using molecular imprinting (MIP) as a protective barrier, an ECL sensor with high affinity for Ochratoxin A (OTA) detection was developed, which expressed the widest linear range of 10(-5 )ng/mL to 1.0 ng/mL and the lowest detection limit of 0.2 pg/mL. This work catches a glimpse of a new generation of desirable perovskite-based ECL emitters, which would be beneficial for its further application.
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