检出限
胶体金
纳米技术
纳米颗粒
生物传感器
肉眼
分析物
化学
水溶液中的金属离子
作者
Hang Ren,Qianqian Zhang,Zhao Meng,Rui Ling,Weidong Qin,Zhenglong Wu
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2021-04-23
卷期号:9 (17): 5924-5932
被引量:2
标识
DOI:10.1021/acssuschemeng.1c00238
摘要
Gold triangular nanoplates (AuTNPs) and gold nanorods (AuNRs) have been widely used in colorimetric sensing due to their shape-dependent localized surface plasmon resonance properties. Herein, we report new colorimetric detection strategies based on a low-cost RGB colorimetry system equipped with an industrial-grade color sensor and provide two demonstrations for the potential applications. The first is the online detection of cadmium ions (Cd²⁺) through the Cd²⁺-promoted etching of glutathione-stabilized AuTNPs that was initialized by H₂O₂ and iodide. For the first time, the etching time corresponding to the inflection point of the first derivative of the Red channel transmission curve was used for calibration. The method was finally applied in the detection of Cd²⁺ in fortified rice samples. In the second demonstration, the RGB values continuously acquired using the instrument were converted to HSV (hue, saturation, and value) space, which was successfully employed in pH detection via etching of AuNRs. Importantly, the overaged AuNRs with poor homogeneity could be discerned by the method at the beginning of analysis, which is helpful in achieving reliable measurements. Our results suggest that integration of the low-cost portable instrument and the new strategies has the promising potential for sensitive, accurate, precise, and good-linearity detection.
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