Fan Yingju, Liu Zhen, Wang Le, Zhan Jinhua
Nanoscale Res Lett. 2009 Jul 15;4(10):1230-1235. doi: 10.1007/s11671-009-9387-6.
The starch-stabilized Ag nanoparticles were successfully synthesized via a reduction approach and characterized with SPR UV/Vis spectroscopy, TEM, and HRTEM. By utilizing the redox reaction between Ag nanoparticles and Hg(2+), and the resulted decrease in UV/Vis signal, we develop a colorimetric method for detection of Hg(2+) ion. A linear relationship stands between the absorbance intensity of the Ag nanoparticles and the concentration of Hg(2+) ion over the range from 10 ppb to 1 ppm at the absorption of 390 nm. The detection limit for Hg(2+) ions in homogeneous aqueous solutions is estimated to be ~5 ppb. This system shows excellent selectivity for Hg(2+) over other metal ions including Na(+), K(+), Ba(2+), Mg(2+), Ca(2+), Fe(3+), and Cd(2+). The results shown herein have potential implications in the development of new colorimetric sensors for easy and selective detection and monitoring of mercuric ions in aqueous solutions. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11671-009-9387-6) contains supplementary material, which is available to authorized users.
通过还原法成功合成了淀粉稳定的银纳米颗粒，并用表面等离子体共振紫外/可见光谱、透射电子显微镜和高分辨率透射电子显微镜对其进行了表征。利用银纳米颗粒与汞离子之间的氧化还原反应以及由此导致的紫外/可见信号的降低，我们开发了一种检测汞离子的比色法。在390nm吸收波长下，银纳米颗粒的吸光度强度与汞离子浓度在10ppb至1ppm范围内呈线性关系。均匀水溶液中汞离子的检测限估计约为5ppb。该系统对汞离子显示出优于其他金属离子（包括钠离子、钾离子、钡离子、镁离子、钙离子、铁离子和镉离子）的优异选择性。本文所示结果对开发新型比色传感器以轻松、选择性地检测和监测水溶液中的汞离子具有潜在意义。电子补充材料：本文的在线版本（doi:10.1007/s11671-009-9387-6）包含补充材料，授权用户可获取。
