Feng Xiangyu, Zhang Jiaying, Wang Jing, Han Ailing, Fang Guozhen, Liu Jifeng, Wang Shuo
State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, 300457 Tianjin, China.
Research Centre of Food Science and Human Health, School of Medicine, Nankai University, 300071 Tianjin, China.
Anal Methods. 2020 Jun 26;12(24):3130-3136. doi: 10.1039/d0ay00657b.
In the synthesis of metal nanoclusters (NCs), small molecules are widely used as capping ligands and reducing agents. However, metal NCs are usually sensitive to solvents and aerobic atmosphere and are also prone to oxidation; thus, their photonic properties deteriorate. In this work, 4-aminothiophenol (PATP) was used as a ligand to prepare Cu NCs and their fluorescence, morphology, and electronic states were characterized. The as-prepared Cu NCs could be dispersed in aqueous media and their fluorescence was sensitive to Hg2+. It was found that after mixing Cu NCs with 2,3-dialdehyde cellulose (DAC) prepared via oxidation by NaIO4, the fluorescence stability of Cu NCs could be enhanced from overnight to 7 days. This might be due to the reaction of the amine group of PATP with the aldehyde group of DAC to form Schiff bases, which are then reduced to form more stable C-N bonds via reduction by NaBH4. Therefore, Cu NCs were attached to a rigid skeleton and their stability increased. Furthermore, the composite of Cu NCs mixed with DAC could be used to prepare colorimetric cards for the rapid detection of Hg2+ with high sensitivity.
在金属纳米团簇（NCs）的合成中，小分子被广泛用作封端配体和还原剂。然而，金属纳米团簇通常对溶剂和有氧气氛敏感，并且也容易氧化；因此，它们的光子性质会变差。在这项工作中，4-氨基硫酚（PATP）被用作配体制备铜纳米团簇，并对其荧光、形态和电子态进行了表征。所制备的铜纳米团簇可以分散在水性介质中，并且它们的荧光对Hg2+敏感。研究发现，将铜纳米团簇与通过高碘酸钠氧化制备的2,3-二醛纤维素（DAC）混合后，铜纳米团簇的荧光稳定性可以从过夜提高到7天。这可能是由于PATP的胺基与DAC的醛基反应形成席夫碱，然后通过硼氢化钠还原形成更稳定的C-N键。因此，铜纳米团簇附着在刚性骨架上，其稳定性增加。此外，铜纳米团簇与DAC混合的复合材料可用于制备比色卡，用于高灵敏度快速检测Hg2+。
