L-cysteine protected copper nanoparticles as colorimetric sensor for mercuric ions.
L-cysteine protected copper nanoparticles as colorimetric sensor for mercuric ions.
复制标题
DOI：
10.1016/j.talanta.2014.07.023
复制
发表时间：
2014-12
期刊：
影响因子：
6.1
通讯作者：
R. A. Soomro;A. Nafady;Sirajuddin;Najma Memon;Tufail H. Sherazi;N. H. Kalwar
中科院分区：
文献类型：
--
作者：
R. A. Soomro;A. Nafady;Sirajuddin;Najma Memon;Tufail H. Sherazi;N. H. Kalwar
本报告展示了一种新的，简单和有效的方案，在水溶液中使用l-半胱氨酸作为封端或保护剂的铜纳米粒子的合成。采用紫外-可见（UV-vis）光谱法对半胱氨酸功能化铜纳米粒子（Cyst-Cu NPs）的LSPR谱带进行了监测，并优化了各种反应参数。傅里叶变换红外（FTIR）光谱提供了关于L-半胱氨酸和Cu纳米颗粒之间的表面相互作用的信息。透射电子显微镜（TEM）证实形成了平均尺寸为34±2.1 nm的细球形、均匀分布的Cyst-Cu NP。X射线衍射（XRD）说明了纯金属相结晶Cyst-Cu NP的形成。将制备的Cyst-Cu NP作为比色传感器进行测试，用于测定水性系统中的汞（Hg 2+）离子。Cyst-Cu NPs在0.5×10−6-3.5×10− 6 molL − 1范围内表现出非常灵敏和选择性的比色检测Hg 2+离子，这是基于通过紫外可见分光光度计监测的LSPR强度的降低。与基于贵金属纳米颗粒的传感器相比，所开发的传感器简单、经济，并且对检测Hg 2+离子敏感，检测限低至4.3×10− 8 mol L−1。在这项工作中开发的传感器具有快速和现场检测Hg 2+离子的高潜力。该传感器已成功应用于评估从信德河不同地点收集的真实的水样中的Hg 2+离子。
This report demonstrates a novel, simple and efficient protocol for the synthesis of copper nanoparticles in aqueous solution usingl-cysteine as capping or protecting agent. UV–visible (UV–vis) spectroscopy was employed to monitor the LSPR band ofl-cysteine functionalized copper nanoparticles (Cyst-Cu NPs) based on optimizing various reaction parameters. Fourier Transform Infrared (FTIR) spectroscopy provided information about the surface interaction betweenl-cysteine and Cu NPs. Transmission Electron Microscopy (TEM) confirmed the formation of fine spherical, uniformly distributed Cyst-Cu NPs with average size of 34±2.1 nm. X-ray diffractometry (XRD) illustrated the formation of pure metallic phase crystalline Cyst-Cu NPs. As prepared Cyst-Cu NPs were tested as colorimetric sensor for determining mercuric (Hg2+) ions in an aqueous system. Cyst-Cu NPs demonstrated very sensitive and selective colorimetric detection of Hg2+ions in the range of 0.5×10−6–3.5×10−6molL−1based on decrease in LSPR intensity as monitored by a UV–vis spectrophotometer. The developed sensor is simple, economic compared to those based on precious metal nanoparticles and sensitive to detect Hg2+ions with detection limit down to 4.3×10−8mol L−1. The sensor developed in this work has a high potential for rapid and on-site detection of Hg2+ions. The sensor was successfully applied for assessment of Hg2+ions in real water samples collected from various locations of the Sindh River.