期刊
NANO LETTERS
卷 19, 期 8, 页码 5388-5393出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b01897
关键词
SNOM; graphene; solid-liquid interface; electrical double layer; near-field; nano-FTIR
类别
资金
- Office of Basic Energy Sciences (BES), Division of Materials Sciences and Engineering, of the U.S. Department of Energy (DOE) through the Structure and Dynamics of Materials Interfaces program [DE-AC02-05CH11231, FWP KC31SM]
- DOE [DE-AC02-05CH11231]
- Energy Biosciences Institute through the EBI-Shell program
We present a new methodology that enables studies of the molecular structure of graphene-liquid interfaces with nanoscale spatial resolution. It is based on Fourier transform infrared nanospectroscopy (nano-FTIR), where the infrared (IR) field is plasmonically enhanced near the tip apex of an atomic force microscope (AFM). The graphene seals a liquid electrolyte reservoir while acting also as a working electrode. The photon transparency of graphene enables IR spectroscopy studies of its interface with liquids, including water, propylene carbonate, and aqueous ammonium sulfate electrolyte solutions. We illustrate the method by comparing IR spectra obtained by nano-FTIR and attenuated total reflection (which has a detection depth of a few microns) demonstrating that the nano-FTIR method makes it possible to determine changes in speciation and ion concentration in the electric double and diffuse layers as a function of bias.
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