Platinum nanoparticle oxidase-like enzyme for colorimetric and photothermal dual-mode detection of sulfide ions

被引：4

作者：

Liang, Junyuan ^{[1
]}

Lei, Xinyu ^{[1
]}

Lu, Xiaoying ^{[1
]}

Zhou, Jinrong ^{[1
]}

Yu, Huimin ^{[1
]}

Huang, Ke ^{[1
]}

机构：

[1] Sichuan Normal Univ, Coll Chem & Mat Sci, Key Lab Land Resources Evaluat & Monitoring Southw, Minist Educ, Chengdu 610068, Sichuan, Peoples R China

来源：

MICROCHEMICAL JOURNAL | 2024年 / 204卷

关键词：

S; 2-; Pt NPs; Colorimetric; Photothermal; Sensing; HYDROGEN-SULFIDE;

D O I：

10.1016/j.microc.2024.111176

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Monitoring sulfide ions (S 2- ) in environmental matrices is critical for environmental safety and pollution control. In this work, a novel dual-mode colorimetric and photothermal (PT) point-of-care testing (POCT) platform was developed for S 2- assay. The synthesized platinum nanoparticles (Pt NPs) exhibited exceptional oxidase-like activity, catalyzing the oxidation of 3,3 ' ,5,5 '-tetramethylbenzidine (TMB) to its oxidized form (oxTMB), causing a color change from colorless to blue. Additionally, oxTMB exhibits significant PT effects under nearinfrared 808 nm laser irradiation. The presence of S 2- induced the aggregation of Pt NPs, markedly inhibiting their oxidase-like activity, thereby establishing an inverse relationship between the concentration of S 2- and both the RGB value and temperature change in TMB solution. The limits of detection (LODs) were calculated to be 1.5 mu M and 4.4 mu M for colorimetric and photothermal analysis using a digital thermometer and smartphone, respectively. The S 2- in lake water and fuel residue was analyzed, yielding satisfactory results. This method offers low-cost, straightforward, and swift advantages, underscoring its potential for POCT in environmental monitoring.

引用

页数：6