Sol-gel derived cerium-oxide-silicon-oxide nanocomposite for cypermethrin detection

[摘要] Cerium oxide (CeO2) nanoparticles have been self-assembled onto sol-gel derived silicon-oxide (SiO2) film fabricated onto indium tin oxide (ITO) coated glass plate. These SiO2-CeO2 nanocomposite films have been used to immobilize the double stranded calf thymus deoxy ribose nucleic acid (dsCf-DNA) by physical adsorption to detect cypermethrin (CM). Both CeO2-SiO2/ITO electrode and dsCT-DNA/CeO2-SiO2/ITO bioelectrodes have been characterized using Fourier transform infrared (FTIR) spectroscopy, scanning electron microsopy (SEM) and differential pulse voltammetry (DPV) to confirm the formation of CeO2-SiO2 nanocomposite and binding of dsCT-DNA with CeO2-SiO2 nanocomposite. Electrochemical response studies of dsCT-DNA/CeO2-SiO2/ITO bioelectrode carried out as a function of CM concentration using DPV technique exhibit detection limit up to 0.0025 ppm with response time of 30 s. (C) 2010 Elsevier B.V. All rights reserved.

[发布日期] 2010-11-30

[效力级别]  Proceedings Paper

[关键词] Cypermethrin;DNA biosensor;Silicon-oxide;Nanocomposite