title: Fast, high-yield synthesis of amphiphilic Ag nanoclusters and the sensing of Hg(2+) in environmental samples.
abstract: We report the high-yield (74%) synthesis of Ag30(Capt)18 (abbreviated as Ag30) in a very time-saving fashion (half an hour). The cluster composition was determined by high-resolution mass spectrometry combined with TG analysis, and the structure was probed by 1D and 2D NMR. Interestingly, the nanoclusters can dissolve in water and methanol, as well as in most organic solvents such as ethanol, acetone, acetonitrile, dichloromethane and ethyl acetate with the assistance of acetic acid. Such a good solubility in a range of various polar solvents was not reported previously in nanoclusters' research and is important for applications. An important result from this work is that Ag30 can sense a low concentration of Hg(2+) in environmental samples (including lake water and soil solution), indicating that Ag30 can be a potential colorimetric probe for Hg(2+). The sensing mechanism was revealed to be related to the anti-galvanic reduction process.
authors.affiliation: Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences (CAS), Hefei 230031, Anhui, China. zkwu@issp.ac.cn.
authors.forename: Nan
authors.initials: N
authors.lastname: Xia
authors.forename: Jie
authors.initials: J
authors.lastname: Yang
authors.forename: Zhikun
authors.initials: Z
authors.lastname: Wu
mesh_terms: D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D057927:Hydrophobic and Hydrophilic Interactions; D008628:Mercury / Q000032:analysis*; D049329:Nanostructures / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D012834:Silver; D008628:Mercury