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Title: Photoelectron spectroscopy of wet and gaseous samples through graphene membranes

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C4NR03561E· OSTI ID:1214459
 [1];  [1];  [1];  [2];  [2];  [2];  [3];  [4];  [5]
  1. Technische Univ. München (Germany)
  2. Elettra - Sincrotrone Trieste (Italy)
  3. Univ. of Maryland, College Park, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Nanoscale Sciencee and Technology
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Nanoscale Sciencee and Technology

Photoelectron spectroscopy (PES) and microscopy are highly important for exploring morphologically and chemically complex liquid–gas, solid–liquid and solid–gas interfaces under realistic conditions, but the very small electron mean free path inside dense media imposes serious experimental challenges. Currently, near ambient pressure PES is conducted using dexterously designed electron energy analyzers coupled with differentially pumped electron lenses which make it possible to conduct PES measurements at a few hPa. This report proposes an alternative ambient pressure approach that can be applied to a broad class of samples and be implemented in conventional PES instruments. It uses ultrathin electron transparent but molecular impermeable membranes to isolate the high pressure sample environment from the high vacuum PES detection system. We show that the separating graphene membrane windows are both mechanically robust and sufficiently transparent for electrons in a wide energy range to allow soft X-ray PES of liquid and gaseous water. The performed proof-of-principle experiments confirm the possibility to probe vacuum-incompatible toxic or reactive samples placed inside such hermetic, gas flow or fluidic environmental cells.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1214459
Journal Information:
Nanoscale, Vol. 6, Issue 23; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 61 works
Citation information provided by
Web of Science

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