title: Non-aggregation based label free colorimetric sensor for the detection of Cu2+ based on catalyzing etching of gold nanorods by dissolve oxygen.
abstract: A label-free non-aggregation colorimetric sensor has been designed for the detection of Cu(2+), based on Cu(2+) catalyzing etching of gold nanorods (AuNRs) along longitudinal axis induced by dissolve oxygen in the presence of S2O3(2-), which caused the aspect ratio (length/width) of AuNRs to decrease and the color of the solution to distinctly change. The linear range and the detection limit (LD, calculated by 10 Sb/k, n=11) of this sensor were 0.080-4.8 µM Cu(2+) and 0.22 µM Cu(2+), respectively. This sensor has been utilized to detect Cu(2+) in tap water and human serum samples with the results agreeing well with those of inductively coupled plasma-mass spectroscopy (ICP-MS), showing its remarkable practicality. In order to prove the possibility of catalyzing AuNRs non-aggregation colorimetric sensor for the detection of Cu(2+), the morphological structures of AuNRs were characterized by high resolution transmission electron microscopy (HRTEM) and the sensing mechanism of colorimetric sensor for the detection of Cu(2+) was also discussed.
authors.affiliation: Department of Chemistry and Environmental Science, Minnan Normal University, Zhangzhou 363000, PR China. Electronic address: zzsyliujiaming@163.com.
authors.forename: Jia-Ming
authors.initials: JM
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Jiao
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Lin
authors.forename: Ma-Lin
authors.initials: ML
authors.lastname: Cui
authors.forename: Xin-Xing
authors.initials: XX
authors.lastname: Wang
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Zhang
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Zheng
authors.forename: Shu-Lian
authors.initials: SL
authors.lastname: Jiang
mesh_terms: D002413:Cations, Divalent; D003116:Color; D003124:Colorimetry / Q000379:methods; D003300:Copper / Q000032:analysis*; D060766:Drinking Water / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006801:Humans; D057230:Limit of Detection; D046529:Microscopy, Electron, Transmission; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010100:Oxygen / Q000737:chemistry*; D013885:Thiosulfates / Q000737:chemistry
chemical_list: D002413:Cations, Divalent; D060766:Drinking Water; D013885:Thiosulfates; D006046:Gold; D003300:Copper; C017717:sodium thiosulfate; D010100:Oxygen
keywords: Catalytic etching; Cu(2+); Gold nanorods; Non-aggregation colorimetric sensor