Electrochemical Detection of Hydrazine and 4-Nitrophenol Based on Layer-by-Layer Assembled Multilayer Films of Reduced Graphene Oxide/Gold Nanoparticles

• Main Authors: Shuohan HUANG, Yueshan ZHOU, Yan GAO, Lei XU, Huijun JIANG
• Format: Article
• Language: English
• Published: IFSA Publishing, S.L. 2015-05-01
• Series: Sensors & Transducers
• Subjects: Reduced graphene oxide; Layer-by-layer; Gold nanoparticle; Hydrazine; 4-Nitrophenol.
• Online Access: http://www.sensorsportal.com/HTML/DIGEST/may_2015/Vol_188/P_2657.pdf

Based on poly sodium 4-styrenesulfonate (PSS) functionalized reduced graphene oxide (RGO) and polyamidoamine (PAMAM) dendrimer protected gold nanoparticles (AuNPs), a novel electrochemical sensing platform for sensitive detection of 4-nitrophenol and hydrazine was fabricated via electrostatic layer-by-layer (LBL) self-assembly on a gold electrode modified with a first layer of poly (diallyldimethylammonium chloride) (PDDA). The resulting nanocomposites were characterized by Raman and UV-Vis spectroscopes. Besides, electrochemical measurements were employed to investigate the electrocatalytic and sensing properties of the as-prepared modified electrode. The results indicate that the LBL assembled PSS-RGO/PAMAM-AuNPs multilayer films possess excellent electrocatalytic activities towards the reduction of 4-nitrophenol (4-NP) and the oxidation of hydrazine and also show good analytical performance for the amperometric detection of the potential poisonous substances. In addition, the combination of the reduced graphene oxide and gold nanoparticles in the LBL assembly films and their synergistic effect may account for the increased electrochemical activities.