Authors : Kanitta Watcharaporn, Mantana Opaprakasit and Vimolvan Pimpan
Abstract: Tannic acid-stabilized silver nanoparticles were synthesized using various initial pH conditions ranging from 5.0-9.0 under UV exposure for 60 min. At pH of 5.0, the color of the silver nanoparticles colloids changed from yellow to greenish blue and the characteristic peak shifted from 420-635 nm as the amounts of pyrazosulfuron-ethyl herbicide increased from 0-400 ppm. On the other hand, those nanoparticles colloids synthesized at pH of 6.0 showed the color change from yellow to red. However, at neutral and alkali conditions, the obtained nanoparticles colloids did not exhibit the sensing ability to this herbicide. The results indicated that UV radiation assisted method can be used for the synthesis of the nano particles at various pH conditions using tannic acid as both reducing agent and stabilizer. This can increase the opportunity to use silver nanoparticles in sensing applications, especially for pH dependent chemicals such as this herbicide.
Kanitta Watcharaporn, Mantana Opaprakasit and Vimolvan Pimpan, 2016. Tannic Acid Stabilized Silver Nanoparticles and its Sensing Application to Pyrazosulfuron Ethyl Herbicide. Journal of Engineering and Applied Sciences, 11: 2113-2117.