Microwave-assisted synthesis of photoluminescent glutathione-capped Au/Ag nanoclusters： A unique sensor-on-a-nanoparticle for metal ions, anions, and small molecules  

作　　者：Jia Zhang Yue Yuan Yu Wang Fanfei Sun Gaolin Liang Zheng Jiang Shu-Hong Yu 

机构地区：[1]Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China [2]Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai201204, China [3]Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

出　　处：《Nano Research》2015年第7期2329-2339,共11页纳米研究（英文版）

基　　金：This work is financially supported by the National Basic Research Program of China （Nos. 2014CB931800 and 2013CB931800）, the National Natural Science Foundation of China （Nos. 21407140, 21431006 and 91227103）, and Scientific Research Grant of Hefei Science Center of CAS （No. 2015SRG-HSC038）. J. Zhang appreciates the Grants from the China Postdoctoral Science Foundation （No. 2013M531515） and the Fun- damental Research Funds for the Central Universities （No. WK2060190036）. The authors also thank beamline BL14W1 （Shanghai Synchrotron Radiation Faculty） for providing the beam time.

摘　　要：Even though great advances have been achieved in the synthesis of luminescent metal nanoclusters, it is still challenging to develop metal nanoclusters with high quantum efficiency as well as multiple sensing functionalities. Here, we demonstrate the rapid preparation of glutathione-capped Au/Ag nanoclusters （GS-Au/Ag NCs） using microwave irradiation and their unique sensing capacities. Compared to bare GS-Au NCs, the doped Au/Ag NCs possess an enhanced quantum yield （7.8% compared to 2.2% for GS-Au NCs）. Several characterization techniques were used to elucidate the atomic composition, particulate character, and electronic structure of the fabricated NCs. According to the X-ray photoelectron spectroscopy （XPS） and X-ray absorption near-edge structure （XANES） spectra, a significant amount of Au exists in the oxidized state as Au（I）, and the Ag atoms are positively charged. In contrast to those nanoclusters that detect only one analyte, the GS-Au/Ag NCs can be used as a versatile sensor for metal ions, anions, and small molecules. In this manner, the NCs can be regarded as a unique sensor-on-a-nanoparticle.

关 键 词：Au/Ag NANOCLUSTERS microwave synthesis x-ray absorption near-edge structure photoluminescence sensing 

分 类 号：O[理学]