title: High-Level Incorporation of Silver in Gold Nanoclusters: Fluorescence Redshift upon Interaction with Hydrogen Peroxide and Fluorescence Enhancement with Herbicide.
abstract: High-level incorporation of Ag in Au nanoclusters (NCs) is conveniently achieved by controlling the concentration of Ag(+) in the synthesis of bovine serum albumin (BSA)-protected Au NCs, and the resulting structure is determined to be bimetallic Ag28 Au10-BSA NCs through a series of characterizations including energy-dispersive X-ray spectroscopy, mass spectroscopy, and X-ray photoelectron spectroscopy, together with density functional theory simulations. Interestingly, the Ag28 Au10 NCs exhibit a significant fluorescence redshift rather than quenching upon interaction with hydrogen peroxide, providing a new approach to the detection of hydrogen peroxide through direct comparison of their fluorescence peaks. Furthermore, the Ag28 Au10 NCs are also used for the sensitive and selective detection of herbicide through fluorescence enhancement. The detection limit for herbicide (0.1 nm) is far below the health value established by the U.S. Environmental Protection Agency; such sensitive detection was not achieved by using AuAg NCs with low-level incorporation of Ag or by using the individual metal NCs.
authors.affiliation: Institute of High Performance Computing, A*STAR, 1 Fusionopolis Way, Singapore, 138632, Singapore.|Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Singapore, 138634, Singapore.
authors.forename: Guijian
authors.initials: G
authors.lastname: Guan
authors.affiliation: Institute of High Performance Computing, A*STAR, 1 Fusionopolis Way, Singapore, 138632, Singapore.
authors.forename: Yongqing
authors.initials: Y
authors.lastname: Cai
authors.affiliation: Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Singapore, 138634, Singapore.
authors.forename: Shuhua
authors.initials: S
authors.lastname: Liu
authors.affiliation: Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Singapore, 138634, Singapore.
authors.forename: Haidong
authors.initials: H
authors.lastname: Yu
authors.affiliation: Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Singapore, 138634, Singapore.
authors.forename: Shiqiang
authors.initials: S
authors.lastname: Bai
authors.affiliation: Institute of High Performance Computing, A*STAR, 1 Fusionopolis Way, Singapore, 138632, Singapore.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Singapore, 138634, Singapore.
authors.forename: Tao
authors.initials: T
authors.lastname: Tang
authors.affiliation: Institute of High Performance Computing, A*STAR, 1 Fusionopolis Way, Singapore, 138632, Singapore.
authors.forename: M S
authors.initials: MS
authors.lastname: Bharathi
authors.affiliation: Institute of High Performance Computing, A*STAR, 1 Fusionopolis Way, Singapore, 138632, Singapore. zhangyw@ihpc.a-star.edu.sg.
authors.forename: Yong-Wei
authors.initials: YW
authors.lastname: Zhang
authors.affiliation: Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Singapore, 138634, Singapore. my-han@imre.a-star.edu.sg.
authors.forename: Ming-Yong
authors.initials: MY
authors.lastname: Han
keywords: density functional calculations; fluorescence; herbicides; hydrogen peroxide; nanoclusters