title: Plasmonic Imaging of Surface Electrochemical Reactions of Single Gold Nanowires.
abstract: Nanomaterials have been widely used in energy and sensing applications because of their unique chemical and physical properties, especially their surface reactions. Measuring the local reactions of individual nanomaterials, however, has been an experimental challenge. Here we report on plasmonic imaging of surface electrochemical reactions of individual gold nanowires (AuNWs). We coated a gold thin film (plasmonic sensing layer) with a dielectric layer (Cytop) with refractive index close to that of water, and then a graphene layer for electrical contact. This design removed the interference from the sensing layer while preserving sharp surface plasmon resonance, which allowed us to obtain cyclic voltammograms of surface electrochemistry of individual AuNWs for the first time. We also investigated the difference in the electrochemical reactions of AuNWs and Au surfaces, and local distribution of electrochemical activities within a single AuNW.
authors.affiliation: Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University , Tempe, Arizona 85287, United States.|Department of Chemistry and Biochemistry, California State University, Los Angeles , Los Angeles, California 90032, United States.
authors.forename: Yixian
authors.identifier: 0000-0001-8691-1128
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University , Tempe, Arizona 85287, United States.|Department of Electrical & Computer Engineering, University of Houston , Houston, Texas 77024, United States.
authors.forename: Xiaonan
authors.identifier: 0000-0001-7521-5573
authors.initials: X
authors.lastname: Shan
authors.affiliation: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.affiliation: Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University , Tempe, Arizona 85287, United States.
authors.forename: Shaopeng
authors.identifier: 0000-0002-2680-0503
authors.initials: S
authors.lastname: Wang
authors.affiliation: Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University , Tempe, Arizona 85287, United States.|State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, China.
authors.forename: Nongjian
authors.initials: N
authors.lastname: Tao