期刊
JOURNAL OF MATERIOMICS
卷 4, 期 2, 页码 165-171出版社
ELSEVIER
DOI: 10.1016/j.jmat.2018.05.002
关键词
CdTe quantum dots; Silk fibroin; Layered doubled hydroxide; Co-assembly; Fluorescence enhancement
资金
- 973 Program [2014CB932101]
- National Natural Science Foundation of China
- 111 Project [B07004]
- Innovation Research Team in University
- Central University Research Funds of China [buctrc201527]
Quantum dots (QDs) luminescent films are extensively applied to optoelectronics and optical devices. However, QDs aggregation results in the quenching of their fluorescence property which limits their practical applications to a greater extent. In order to resolve this issue, 3-mercaptopropionic acid (3-MPA) functionalized Cadmium Tellurium (CdTe) QDs were stabilized by silk fibroin (SB) and co-assembled with layered doubled hydroxide (LDH) to form (QDs@SF/LDH)(n) ultrathin films (UTFs) via the layer-by-layer (LBL) technique. UV-Vis absorption and fluorescence spectroscopy showed a stepwise and normal growth of the films upon increasing the number of deposition cycles. XRD and AFM studies confirmed the formation of a periodic layered structure and regular surface morphology of the thin films. As compared to (CdTe QDs/LDH)(n)UTFs, the (CdTe QDs@SF/LDH) nUTFs displayed fluorescence enhancement and longer fluorescent lifetime, both in solid states and aqueous solutions. Furthermore compared with the solution state, the fluorescence enhancement of SF-RC and SF-beta are, respectively, 7 times and 17 times in the (CdTe QDs@SF/LDH)(n) UTFs, indicating that the LDH nanosheets favor the fluorescence enhancement effect on the CdTe QDs@SF. The fabricated materials displayed fluorescence response to a biological molecule such as immune globulin, lgG. Thus, the (CdTe QDs@SF/LDH)(n) UTFs has a potential to be used as biosensor. (C) 2018 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.
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