Highly selective and sensitive paper-based colorimetric sensor using thiosulfate catalytic etching of silver nanoplates for trace determination of copper ions
Highly selective and sensitive paper-based colorimetric sensor using thiosulfate catalytic etching of silver nanoplates for trace determination of copper ions
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DOI：
10.1016/j.aca.2015.01.042
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发表时间：
2015-03-25
影响因子：
6.2
通讯作者：
Chailapakul, Orawon
中科院分区：
文献类型：
--
作者：
Chaiyo, Sudkate;Siangproh, Weena;Chailapakul, Orawon
研制了一种新型、高选择性、高灵敏度的纸基比色传感器，用于痕量铜（Cu 2+）的测定。该测量基于硫代硫酸盐（S2 O32）对银纳米片（AgNPls）的催化蚀刻。在pH为11的铵缓冲溶液中加入Cu ~（2+）后，AuNPls/S_2 O_（32）在522 nm处的吸收峰强度降低，粉紫色AuNPls变得清晰，肉眼可见。该测定提供了相对于其他金属离子（K+、Cr 3+、Cd 2+、Zn 2+、As 3+、Mn 2+、Co2+、Pb 2+、Al 3+、Ni 2+、Fe 3+、Mg 2+、Hg 2+和Bi 3+）的高灵敏度和选择性的Cu 2+检测。在此基础上，利用银纳米粒子的催化蚀刻作用，研制了一种简便、快速的纸基比色传感器。在优化的条件下，在Cu 2+的存在下，涂覆在装置的测试区处的改性AgNPl立即改变颜色。通过目视检测，发现检测限（LOD）为1.0 ng mL（-1）。对于采用图像处理的半定量测量，该方法检测到Cu 2+的范围为0.5-200 ng mL（-1）（R-2 = 0.9974），LOD为0.3 ng mL（-1）。该方法已成功地应用于检测范围广泛的真实的样品，包括水，食品和血液中的铜2+。根据配对t检验，结果与电感耦合等离子体发射光谱法（ICP-OES）的结果一致。(C)2015 Elsevier B. V.版权所有。
A novel, highly selective and sensitive paper-based colorimetric sensor for trace determination of copper (Cu2+) ions was developed. The measurement is based on the catalytic etching of silver nanoplates (AgNPls) by thiosulfate (S2O32). Upon the addition of Cu2+ to the ammonium buffer at pH 11, the absorption peak intensity of AuNPls/S2O32 at 522 nm decreased and the pinkish violet AuNPls became clear in color as visible to the naked eye. This assay provides highly sensitive and selective detection of Cu2+ over other metal ions (K+, Cr3+, Cd2+, Zn2+, As3+, Mn2+, Co2+, Pb2+, Al3+, Ni2+, Fe3+, Mg2+, Hg2+ and Bi3+). A paper-based colorimetric sensor was then developed for the simple and rapid determination of Cu2+ using the catalytic etching of AgNPls. Under optimized conditions, the modified AgNPls coated at the test zone of the devices immediately changes in color in the presence of Cu2+. The limit of detection (LOD) was found to be 1.0 ng mL(-1) by visual detection. For semi-quantitative measurement with image processing, the method detected Cu2+ in the range of 0.5-200 ng mL(-1)(R-2 = 0.9974) with an LOD of 0.3 ng mL(-1). The proposed method was successfully applied to detect Cu2+ in the wide range of real samples including water, food, and blood. The results were in good agreement according to a paired t-test with results from inductively coupled plasma-optical emission spectrometry (ICP-OES). (C) 2015 Elsevier B.V. All rights reserved.