Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, PR China.
Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, PR China.
J Hazard Mater. 2020 Nov 5;398:122890. doi: 10.1016/j.jhazmat.2020.122890. Epub 2020 May 15.
Ultra sensitive detection of mercuric ion (Hg) with superior anti-interference capability from natural water is of great significance for food safety, environmental protection, and human health. We herein develop Au ordered nanorod arrays (Au NRAs) as surface-enhanced Raman scattering (SERS) substrates to construct SERS-active and signal-reproducible sensing platforms modified with 4-mercaptophenylboronic acid (4-MBA) as multifunctional SERS reporters. The aqueous Hg can be efficiently trapped by 4-MBA through electrophilic substitution reactions and precisely appraise its concentration based on the collective spectral changes of reporters including peak disappearance, emergence, and Raman shift. Based on this, the optical nanoprobe shows an ultrahigh detection sensitivity of 0.1 nM for Hg, which is two orders of magnitude lower than the U.S.A. environmental protection agency (EPA)-required maximum level of drinkable water. It also offers both an exceptional Hg discrimination against other metal ions as well as organic ligands and perfect feasibilities of detecting solutions with ultra-wide pH ranges from 1.0-14.0 at varying temperatures. Moreover, the nanoprobe demonstrates an ability to identify different chemical forms of mercury and has a high repeatability, accuracy and reliability to meet the practical detection requirements in natural environments.
超灵敏检测汞离子（Hg），具有优异的抗干扰能力，来自天然水，对食品安全、环境保护和人类健康具有重要意义。我们在此开发了金有序纳米棒阵列（Au NRAs）作为表面增强拉曼散射（SERS）基底，构建了具有 4-巯基苯硼酸（4-MBA）作为多功能 SERS 报告器的 SERS 活性和信号可重现的传感平台。水溶液中的 Hg 可以通过亲电取代反应被 4-MBA 有效地捕获，并基于包括峰消失、出现和拉曼位移在内的报告器的集体光谱变化来精确评估其浓度。基于此，光学纳米探针对 Hg 的检测灵敏度高达 0.1 nM，比美国环境保护署（EPA）规定的饮用水最大允许水平低两个数量级。它还能对其他金属离子和有机配体进行出色的 Hg 区分，并能在不同温度下在超宽 pH 值范围（1.0-14.0）下检测溶液，具有完美的可行性。此外，该纳米探针能够识别不同形式的汞，具有高重复性、准确性和可靠性，能够满足自然环境中的实际检测要求。
