文献类型：期刊文献

英文题名：Self-doping synthesis of iodine-carbon quantum dots for sensitive detection of Fe(iii) and cellular imaging

作者：Luo, Kun[1];Luo, Wenyi[1];Liang, Zhibin[1];Li, Yubin[1];Kang, Xinhuang[1];Wu, Yulian[1];Wen, Yanmei[1]

机构：[1]Guangdong Ocean Univ, Fac Chem & Environm Sci, Zhanjiang 524088, Peoples R China

年份：2022

卷号：46

期号：40

起止页码：19283

外文期刊名：NEW JOURNAL OF CHEMISTRY

收录：SCI-EXPANDED(收录号：WOS:000862287800001)、、EI(收录号：20224413017369)、Scopus(收录号：2-s2.0-85140484508)、WOS

基金：This research was funded by the Natural Science Foundation of Guangdong Province (No. 2021A1515010304), the Enhancing School with Innovation of Guangdong Ocean University (No. 230419054), and the Laboratory of Marine Chemistry Resource Utilization and Research (No. Q17092).

语种：英文

外文关键词：Carbon - Fluorescence quenching - Iodine - Iron compounds - Lanthanum compounds - Nanocrystals - Optical properties - Particle size

外文摘要：Carbon quantum dots (CQDs) are carbon nanomaterials with fluorescent properties. Due to their unique structure and optical properties, CQDs have become a research hotspot in recent years. In this paper, iodine-doped CQDs (I-CQDs) with high photoluminescence (PL) (fluorescence quantum yield similar to 36.2%) were innovatively prepared using a self-doping method with p-iodobenzoic acid as the only precursor. The average particle size of the I-CQDs is 6.42 nm, the maximum excitation wavelength is 330 nm, and the maximum emission wavelength is 408 nm. Fluorescence-sensing experiments showed that the I-CQDs could be used as a 'turn-off' fluorescence sensor for Fe3+, with a detection limit of 0.47 mu M. The cause of the fluorescence quenching can be attributed to dynamic quenching and the inner filter effect. When the sensor detects ferric ions in actual water samples, the spiked recoveries are 99.2% to 107.5%, with good reproducibility and high accuracy. Moreover, I-CQDs with their lower cytotoxicity could be used for the imaging of HeLa cells over longer times and as a new type of fluorescent labeling material for environment monitoring, cell labeling, and cellular imaging.