AVS 60th International Symposium and Exhibition
    Nanometer-scale Science and Technology Tuesday Sessions
       Session NS-TuP

Paper NS-TuP16
Redox Signal Enhancement using Nanogap Electrodes via Control of Gap Distance

Tuesday, October 29, 2013, 6:00 pm, Room Hall B

Session: Nanometer-scale Science and Technology Poster Session
Presenter: D.K. Park, Sungkyunkwan University, Republic of Korea
Authors: D.K. Park, Sungkyunkwan University, Republic of Korea
J. Park, Sungkyunkwan University, Republic of Korea
S. Kim, Sungkyunkwan University, Republic of Korea
W.S. Yun, Sungkyunkwan University, Republic of Korea
Correspondent: Click to Email
We report on a redox signal enhancement using nanogap electrodes (NGEs). The distance between NGEs was controlled from 1 μm to a few tens of nanometer where NGEs was narrowed by chemical deposition of reduced Au ion on the pre-defined electrodes. Enhanced redox current of ferri/ferrocyanide was obtained by redox cycling between the two working electrodes. The faradaic current is amplified about a thousand times in this redox system by narrowing the gap distance about 200 nm to 30 nm. The experimental results were discussed on the basis of the cyclic voltammetry (CV), atomic force microscope (AFM) and scanning electron microscope (SEM) measurements.