自催化
检出限
纳米孔
试剂
自来水
水溶液中的金属离子
离子
膜
纳米技术
纳米材料基催化剂
原位
材料科学
化学
分析化学(期刊)
纳米颗粒
化学工程
催化作用
色谱法
环境科学
有机化学
工程类
环境工程
生物化学
作者
Haiyan Fu,Qiaobo Yin,Huili Wang,Jinfang Nie,Wencheng Xiao,Zhao‐Ying Liu,Yijing Chen,Yun Zhang
标识
DOI:10.1016/j.snb.2019.02.063
摘要
This work initially describes a sample-in-answer-out paper-based assay for simple, rapid, sensitive, specific, and low-cost detection of silver (I) (Ag+) ions. It combines Ag+-triggered in situ autocatalysis for signal amplification with an instrument-free, timing readout in 3D origami paper-based analytical devices integrated with nanopore membranes (NMs). The autocatalytic amplification is based on the oxidability of Ag+ towards 3,3',5,5'-tetramethylbenzidine (TMB) loaded in the NMs. The Ag+ ions are rapidly reduced by the TMB to form silver nanoparticles that further act as nanocatalysts to catalyse the oxidation of more TMB molecules to their derivatives by Ag+ ions for producing bigger (and more) metal particles. The NM’s pores are thus partially blocked by these metal particles to adjust (prolong) the flowing time of a coloured reagent in the paper device. Under optimized conditions, this developed point-of-need method could quantitatively detect the Ag+ ions in a linear concentration range of 1.9–62.5 nM within 4 min, by simply using a ubiquitous phone (or a timer). Its detection limit was estimated to be ˜0.91 nM according to the 3σ rule. The recoveries of analyzing real water examples (i.e., pond water, tap water, drinking water, and soil water) were from ˜95.2 to ˜103.9%, and the corresponding relative standard deviations ranged from 3.3 to 8.1% (n = 6).
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