AVS 63rd International Symposium & Exhibition
    Electronic Materials and Photonics Wednesday Sessions
       Session EM+NS-WeM

Paper EM+NS-WeM5
Au Nanoparticle Modified Indium Tin Oxide Ultramicroelectrode for Single Particle Spectro-electrochemistry Study and Ultrasensitive Electrochemistry Sensing

Wednesday, November 9, 2016, 9:20 am, Room 102A

Session: Nanoparticles for Electronics and Photonics
Presenter: Yanxiao Ma, The University of Alabama
Authors: Y. Ma, The University of Alabama
S. Pan, The Univeristy of Alabama
Correspondent: Click to Email
Plasmonic active metal NPs are broadly used in electrochemical and optical sensing of molecular recognition events. However, it is extremely challenging to resolve chemical and physical transformation at single NP level using conventional optical and electrochemical methods for resolving their local structure-function relationship. We are developing an optical and electrochemical technique to resolve electrocatalytic property of single NPs. Combined methods of photolithography and electrodeposition are used for fabricating Au NP modified indium tin oxide ultramicroelectrode (ITO UME). Dark field scattering (DFS) microscopy and scanning electron microscopy (SEM) were used to characterize NPs on the surface of ITO UME. The electrochemistry voltammetric study shows that Au and Pt NPs are ideal catalytic materials for hydrazine oxidation reaction. Dark field spectroelectrochemical study of hydrazine oxidation at planer ITO and ITO UME confirmed the formation of nanobubbles on NPs surface. Relationship between DFS light intensity and hydrazine oxidation current profile was obtained.