Fermi level-tuned optics of graphene for attocoulomb-scale quantification of electron transfer at single gold nanoparticles.

ABSTRACT: Measurement of electron transfer at single-molecule level is normally restricted by the detection limit of faraday current, currently in a picoampere to nanoampere range. Here we demonstrate a unique graphene-based electrochemical microscopy technique to make an advance in the detection limit. The optical signal of electron transfer arises from the Fermi level-tuned Rayleigh scattering of graphene, which is further enhanced by immobilized gold nanostars. Owing to the specific response to surface charged carriers, graphene-based electrochemical microscopy enables an attoampere-scale detection limit of faraday current at multiple individual gold nanoelectrodes simultaneously. Using the graphene-based electrochemical microscopy, we show the capability to quantitatively measure the attocoulomb

SUBMITTER: Xia Q 

PROVIDER: S-EPMC6710286 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature