Ammonia sensing of silver nanoparticles synthesized using tannic acid combined with UV radiation: Effect of UV exposure time
Ammonia sensing of silver nanoparticles synthesized using tannic acid combined with UV radiation: Effect of UV exposure time
复制标题
DOI：
10.1016/j.jksus.2017.10.003
复制
发表时间：
2019-04-01
影响因子：
3.8
通讯作者：
Pimpan, Vimolvan
中科院分区：
文献类型：
--
作者：
Ritthichai, Thanawan;Pimpan, Vimolvan
以银银为银前驱体，单宁酸为还原剂和稳定剂，在室温和中性条件下，利用紫外光辅助绿色合成了银纳米粒子。本研究的目的是研究紫外线照射时间对合成的纳米颗粒和氨传感能力的影响;因此，紫外线照射时间从15，30，45，60，90到120 min不等。在紫外可见光谱中，在370和425 nm附近的特征峰的强度随着紫外线照射时间的增加而增加。通过透射电子显微镜显示具有8-30 nm范围内的直径的球形纳米颗粒，并通过HRTEM显示其晶体结构。加入氨水后，合成的纳米胶体颜色由橙黄色变为肉眼可初步观察到的黄绿色。它们还显示出在320 nm附近的吸收峰以及在370和425 nm处的吸收峰强度的降低。结果表明，在该体系中，紫外光照射时间为60 min时，制备的银纳米粒子对氨具有较好的敏感性，检测限为100 ppm。(C)2017作者Elsevier B. V.代表沙特国王大学制作和主持。
Green synthesis of silver nanoparticles were done using silver nitrate as a silver precursor and tannic acid as a reducing agent and a stabilizer with the assistance of UV radiation at room temperature and neutral condition. The aim of this research was to study the effect of UV exposure time on the synthesis and ammonia sensing ability of the obtained nanoparticles; therefore, UV exposure times were varied from 15, 30, 45, 60, 90 to 120 min. The intensities of the characteristic peak at around 370 and 425 nm in UV-vis spectra increased with increasing UV exposure time. The spherical nanoparticles having the diameters in the range of 8-30 nm were revealed by transmission electron microscope and its crystal structure was revealed by HRTEM. After adding ammonia, the color of all synthesized nanoparticles colloids changed from orange-yellow to yellowish-green which can be preliminary observed by the naked eyes. They also exhibited the absorbance peaks at around 320 nm and a decrease in the intensities of the absorbance peaks at 370 and 425 nm. The results suggested that UV exposure time of 60 min used in this system was suitable for synthesizing silver nanoparticles with high sensing ability to ammonia and the detection limit of 100 ppm. (C) 2017 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University.