CUED Publications database

Graphene Membranes for Atmospheric Pressure Photoelectron Spectroscopy.

Weatherup, RS and Eren, B and Hao, Y and Bluhm, H and Salmeron, MB Graphene Membranes for Atmospheric Pressure Photoelectron Spectroscopy. J Phys Chem Lett, 7. pp. 1622-1627. (Unpublished)

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Abstract

Atmospheric pressure X-ray photoelectron spectroscopy (XPS) is demonstrated using single-layer graphene membranes as photoelectron-transparent barriers that sustain pressure differences in excess of 6 orders of magnitude. The graphene serves as a support for catalyst nanoparticles under atmospheric pressure reaction conditions (up to 1.5 bar), where XPS allows the oxidation state of Cu nanoparticles and gas phase species to be simultaneously probed. We thereby observe that the Cu(2+) oxidation state is stable in O2 (1 bar) but is spontaneously reduced under vacuum. We further demonstrate the detection of various gas-phase species (Ar, CO, CO2, N2, O2) in the pressure range 10-1500 mbar including species with low photoionization cross sections (He, H2). Pressure-dependent changes in the apparent binding energies of gas-phase species are observed, attributable to changes in work function of the metal-coated grids supporting the graphene. We expect atmospheric pressure XPS based on this graphene membrane approach to be a valuable tool for studying nanoparticle catalysis.

Item Type: Article
Uncontrolled Keywords: Atmospheric Pressure Graphite Particle Size Photoelectron Spectroscopy Surface Properties
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:30
Last Modified: 19 Oct 2017 01:28
DOI: