119th General Meeting of the KCS

Type Poster Presentation
Area 전기화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code ELEC.P-519
Subject Controlling platinum microstructures on electrodes for simple and selective amperometric sensing of nitric oxide
Authors 김소희, 이영미*
이화여자대학교 화학나노과학과, Korea
Abstract Nitric oxide (NO) is known as an important gaseous signaling molecule in biological systems, playing roles as vasodilation, immune response, and neurotransmission. Therefore, real-time simultaneous detections of NO in vitro/vivo are valuable in medical and biological sciences. Electrochemical sensors have advantages of in situ and/or real time NO measurements. However, a variety of biological interferents including anionic ascorbic acid, neutral acetaminophen and cationic dopamine can be oxidized at potentials required to detect NO based on the oxidation. Several ways have been tried to reduce the interruption from these interferents with selective membranes such as chloroprene, PTFE (polytetrafluoroethylene), fluorinated xerogel and Nafion. In this research, we studied a simple fabrication method of a selective NO sensor by controlling surface microstructures of platinum (Pt) electrodes. Different morphologies of Pt nanoparticles were electrodeposited on a gold (Au) disk electrodes (diameter, 2 mm) depending on the concentrations of Pt precursors. The morphologies and compositions of the deposited Pt nanoparticles were characterized by field-emission scanning electron microscopy (FE-SEM). Also, water contact angles with drops of deionized water on the electrodes were measured to investigate the hydrophobicity of the electrode surfaces (IMAGE J). Amperometric responses of the electrodes to NO and interferents were obtained at +0.75 V versus Ag/AgCl. The more hydrophobic structure exhibited the higher selectivity to NO over interferents. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT& Future Planning (2014R1A2A2A05003769).
E-mail kimsh_12@naver.com