Selective Colorimetric Detection of Hydrogen Sulfide Based on Primary Amine-Active Ester Cross-Linking of Gold Nanoparticles

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• 作者：Zhiqin Yuan ; Fengniu Lu ; Meihua Peng ; Chia-Wei Wang ; Yu-Ting Tseng ; Yi Du ; Na Cai ; Chia-Wen Lien ; Huan-Tsung Chang ; Yan He ; Edward S. Yeung
• 刊名：Analytical Chemistry
• 出版年：2015
• 出版时间：July 21, 2015
• 年：2015
• 卷：87
• 期：14
• 页码：7267-7273
• 全文大小：362K
• ISSN：1520-6882

文摘

Hydrogen sulfide (H₂S) is a highly toxic environmental pollutant and also an important gaseous transmitter. Therefore, selective detection of H₂S is very important, and visual detection of it with the naked eye is preferred in practical applications. In this study, thiolated azido derivates and active esters functionalized gold nanoparticles (AE-AuNPs)-based nanosensors have been successfully prepared for H₂S perception. The sensing principle consists of two steps: first, H₂S reduces the azide group to a primary amine; second, a cross-linking reaction between the primary amine and active ester induces the aggregation of AuNPs. The AE-AuNPs-based nanosensors show high selectivity toward H₂S over other anions and thiols due to the specific azide鈥揌₂S chemistry. Under optimal conditions, 0.2 渭M H₂S is detectable using a UV鈥搗is spectrophotometer, and 4 渭M H₂S can be easily detected by the naked eye. In addition, the practical application of the designed nanosensors was evaluated with lake water samples.