Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7148706 | Sensors and Actuators B: Chemical | 2013 | 7 Pages |
Abstract
Iâ could accelerate the selective etching along longitudinal direction of gold nanorods (AuNRs) induced by Fe3+ in HCl medium, which decreased the aspect ratio (length/width) of AuNRs, and thus the longitudinal surface plasmon resonance (LSPR) absorption peaks of AuNRs blue shifted (Îλ = λ0 â λ), the corresponding absorbance decreased (ÎA = A0 â A), and the color of the solution obviously changed. Therefore, a non-aggregation AuNRs colorimetric sensor for the detection of Iâ was developed. The proposed colorimetric sensor is responsive, simple, selective and sensitive with the limit of quantization (LOQ) of 8.8 Ã 10â8 M. The highly accurate sensor has been used to determine the content of Iâ in table salt samples with the results consistent with those obtained by inductively coupled plasma-mass spectroscopy (ICP-MS). Moreover, the morphological changes of AuNRs during the etching procedure were characterized by high resolution transmission electron microscopy (HRTEM) and the sensing mechanism for Iâ detection was also discussed.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Jia-Ming Liu, Li Jiao, Ma-Lin Cui, Li-Ping Lin, Xin-Xing Wang, Zhi-Yong Zheng, Li-Hong Zhang, Shu-Lian Jiang,