Silver enriched silver phosphate microcubes as an efficient recyclable SERS substrate for the detection of heavy metal ions
Silver enriched silver phosphate microcubes as an efficient recyclable SERS substrate for the detection of heavy metal ions
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DOI：
10.1016/j.jcis.2021.07.084
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发表时间：
2021-07-26
影响因子：
9.9
通讯作者：
Yang, Thomas Chung-Kuang
中科院分区：
文献类型：
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作者：
Kamal, Surabhi;Yang, Thomas Chung-Kuang
快速、经济、准确地检测重金属离子对人体健康监测和环境保护至关重要。表面增强拉曼光谱（Sers）由于其优异的性能，已成为一种可靠的鉴定污染物的方法。本文采用两种不同的沉淀方法制备了磷酸银微立方体（Ag 3 PO 4），用于重金属离子的超灵敏Sers检测。使用有机连接剂（BPy）与Ag 3 PO 4能够固定Hg 2+和Pb（2+）离子。通过XRD、UV-DRS、FESEM结合EDX和HRTEM等手段证实了Ag 3 PO 4的生成。分析增强因子（AEF）为10（10），检出限为10（-15）M，灵敏度高。在此基础上，提出并讨论了可能的Sers机理。此外，由于其对重金属离子的上级催化降解能力，在负载重金属的基底上的光暴露后，实现了至少四个循环的Ag 3 PO 4基底的优异的可重复使用性。所制备的基底具有良好的稳定性、选择性和对真实的样品的Sers灵敏度。结果表明，Ag 3 PO 4微立方体在可循环Sers应用中具有良好的前景。(C)2021爱思唯尔公司All rights reserved.
A rapid, cost-effective and accurate detection of heavy metal ions is crucial for human health monitoring and environmental protection. Surface-enhanced Raman spectroscopy (SERS) has become a reliable method due to its outstanding performance for the identification of contaminants. In this paper, silver phosphate microcubes (Ag3PO4) were fabricated using two different precipitation methods for ultrasensitive SERS detection of heavy metal ions. The use of an organic linker (BPy) with Ag3PO4 enabled the immobilization of Hg2+ and Pb(2+)ions. The formation of Ag3PO4 was confirmed by XRD, UV-DRS, FESEM coupled with EDX and HRTEM. The analytical enhancement factor (AEF) obtained was 10(10) with a detection limit of 10(-15) M indicating high sensitivity. Based on these results, the possible SERS mechanism has been proposed and discussed. Moreover, an excellent reusability of Ag3PO4 substrate for at least four cycles was achieved upon the light exposure on heavy metal loaded substrate due to its superior catalytic ability for the degradation of heavy metal ions. The as-prepared substrate demonstrated remarkable stability, selectivity and SERS sensitivity towards real samples. The results conclude that Ag3PO4 microcubes offer a great prospect in recyclable SERS applications. (C) 2021 Elsevier Inc. All rights reserved.