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Title: Lignin-based carbon quantum dots with high fluorescence performance prepared by supercritical catalysis and solvothermal treatment for tumor-targeted labeling

Journal Article · · Advanced Composites and Hybrid Materials
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  1. Guangxi Univ., Nanning (China)
  2. Guangxi International Zhuang Medicine Hospital (China)
  3. China Univ. of Mining and Technology, Xuzhou, Jiangsu (China)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Sciences (JIBS)

The poor fluorescence performance of lignin-based carbon quantum dots (L-CQDs) prepared using the bottom-up method has hindered their development. Here, in this study, a two-step strategy was proposed to efficiently enhance the fluorescence properties of L-CQDs. Lignin was first cracked using an ethanol supercritical/noble metal catalyst; then, the L-CQDs were prepared with the cracked lignin fragments as carbon precursors without adding any modified reagents. Compared with the OL-CQDs prepared by the traditional one-pot hydrothermal method, the L-CQDs-1 prepared from CL-1 containing much low molecular weight compounds, and have photoluminescence (increased from 63 to 975) and excellent up-conversion photoluminescence (enhanced by 16.3 to 963), which significantly enhanced by about 15 times and 60 times, respectively. They can emit bright blue fluorescence under both ultraviolet and near-infrared light irradiation owing to a large amount of surface defects caused by the rich compound composition. When L-CQDs-1 were combined with, and quenched by folic acid (FA), the prepared FA@L-CQDs-1 show the ability to target and label tumor cells. This study opens new avenues for the preparation of L-CQDs with high fluorescence performance using lignocellulosic material without heteroatom additives.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China; National Key Research and Development Program of China; Guangxi Science and Technology Major Program; Foundation of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1971027
Journal Information:
Advanced Composites and Hybrid Materials, Journal Name: Advanced Composites and Hybrid Materials Journal Issue: 2 Vol. 6; ISSN 2522-0128
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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