Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 834, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154399
Keywords
Carbon dots; Yellow emission; Fluorescence mechanism; Nanocomposite; Shape recovery
Categories
Funding
- National Natural Science Foundation of China [31870549]
- Jiangsu Nature Science Foundation [BK20161524]
- Program for 333 Talents Project in Jiangsu Province [BRA2016381]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX17_839]
- Advanced Analysis and Testing Center of Nanjing Forestry University
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Synthesizing carbon dots (CDs) with efficient long-wavelength emissions (i.e., yellow-to red light) generally suffer from sophisticated approaches, time-consuming process, harsh conditions, and requirement of organic solvent; also, a further limitation of the resulting CDs is relatively low quantum yield (QY) in aqueous solution. Herein, novel yellow emitting CDs (Y-CDs) with a considerable QY of 62.8% were synthesized from a precursor comprising resorcinol and o-phenylenediamine via a facile microwave method. To probe the fluorescence mechanism, another typical resorcinol-derived CDs using ethylenediamine as dopant were fabricated as well, showing strong green emission with an absolute QY of 60.6%. Spectroscopic and structural characterizations indicated that the distinct redshift of green to yellow emission depended on the dimension of conjugated sp(2)-domain and the content of graphitic N heavily, while the excellent QY was highly related to the low proportion of defective sp(2) carbon cluster and high nitrogen content within CDs. Moreover, the Y-CDs were confirmed to be capable of introducing additional crosslinking points in poly(vinyl alcohol) (PVA) polymer, which resulted in the Y-CDs-contained nanocomposite behaving superior and tunable water-induced shape recovery performances. Importantly, since being labeled with long-wavelength emission, the responsiveness of PVA/Y-CDs composite will contribute to its versatile utilization in biology-relevant fields. (C) 2020 Published by Elsevier B.V.
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