Mercury(II) selective sensors based on AlGaN/GaN transistors
Mercury(II) selective sensors based on AlGaN/GaN transistors
复制标题
DOI：
10.1016/j.aca.2016.08.045
复制
发表时间：
2016-11-02
影响因子：
6.2
通讯作者：
Parish, Giacinta
中科院分区：
文献类型：
--
作者：
Asadnia, Mohsen;Myers, Matthew;Parish, Giacinta
这项工作提出了第一个聚合物的方法来检测金属离子使用AlGaN/GaN晶体管为基础的传感器。该传感器利用AlGaN/GaN高电子迁移率晶体管型结构，通过用基于聚氯乙烯（PVC）的离子选择性膜功能化栅极区域。基于该技术的传感器是便携式的，耐用的，通常对目标分析物高度敏感;在这种情况下，Hg 2+。该传感器显示出快速和稳定的响应时，它被引入到不同的Hg 2+浓度的溶液。在pH2.8的10（-2）M KNO_3离子缓冲液中，检出限低于10（-8）M，线性范围为10（-8）M ~ 10（-4）M。该检测限比巯基乙酸单层功能化AlGaN/GaN HEMT器件的10（-7）M的报告检测限低一个数量级。在10（-2）M Cd（NO_3）（2）和10（-2）M Pb（NO_3）（2）离子缓冲液中，检测限分别约为10（-7）M和10（-6）M。此外，我们表明，在各种条件下，表观门响应是近能斯特。X射线光电子能谱（XPS）实验证实，传感膜是可逆的后，暴露于Hg 2+溶液和去离子水冲洗。这项研究的成功先于该技术的发展，该技术在设备阵列上使用适当的聚合物基膜选择性地感测水中的多种离子。皇冠版权所有（C）2016由Elsevier B. V.出版。保留所有权利。
This work presents the first polymer approach to detect metal ions using AlGaN/GaN transistor-based sensor. The sensor utilised an AlGaN/GaN high electron mobility transistor-type structure by functionalising the gate area with a polyvinyl chloride (PVC) based ion selective membrane. Sensors based on this technology are portable, robust and typically highly sensitive to the target analyte; in this case Hg2+. This sensor showed a rapid and stable response when it was introduced to solutions of varying Hg2+ concentrations. At pH 2.8 in a 10(-2) M KNO3 ion buffer, a detection limit below 10(-8) M and a linear response range between 10(-8) M-10(-4) M were achieved. This detection limit is an order of magnitude lower than the reported detection limit of 10(-7) M for thioglycolic acid monolayer functionalised AlGaN/GaN HEMT devices. Detection limits of approximately 10(-7) M and 10(-6) M in 10(-2) M Cd(NO3)(2) and 10(-2) M Pb(NO3)(2) ion buffers were also achieved, respectively. Furthermore, we show that the apparent gate response was near-Nernstian under various conditions. X-ray photoelectron spectroscopy (XPS) experiments confirmed that the sensing membrane is reversible after being exposed to Hg2+ solution and rinsed with deionised water. The success of this study precedes the development of this technology in selectively sensing multiple ions in water with use of the appropriate polymer based membranes on arrays of devices. Crown Copyright (C) 2016 Published by Elsevier B.V. All rights reserved.