Label-free, sensitive colorimetric detection of mercury(II) by target-disturbed in situ seeding growth of gold triangular nanoprisms. (13th March 2020)

• Record Type: Journal Article
• Authors: Ling, Rui; Zhang, Qianqian; Ren, Hang; Tursen, Janar; Bi, Junmin; Wu, Zhenglong; Qin, Weidong; Zhang, Chenling
• Is Part Of: Nanotechnology. Volume 31:Number 22(2020)
• Publication Date: 2020-03-13
• Subjects: colorimetry -- mercury -- seeding growth -- nanoprisms; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ab7584
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Gold nanomaterials have been used extensively in colorimetric detection of mercuric ions (Hg 2+ ) due to their shape- and size-dependent, ultrastrong localized surface plasmon resonance (LSPR). Conventional detection was performed by first synthesizing the nanomaterials, and then applying them to signal-transducing reactions. We herein report a convenient method for detecting Hg 2+ based on gold triangular nanoprisms (AuTNPs). During the seeding-growth process, Hg 2+ added to the growth solution was co-reduced and deposited on the high-energy facets of the gold seeds, affecting the deposition patterns of the subsequently generated Au 0 and ultimately leading to the formation of defective AuTNPs. Morphological changes were reflected by the in-plane dipole LSPR wavelength shift, which was proportionally related to the concentration of Hg 2+ . To improve the selectivity, the interference from Ag + was eliminated by a stepwise preparation-selective precipitation approach. Under the optimized conditions, Hg 2+ could be selectively detected with 20 min, with a detection limit of 0.12 nM. Finally, the method was successfully applied to detecting trace Hg 2+ in fortified drinking, mineral and rain water samples, with recoveries ranging from 95.17% to 110.6%.