# Characterization of Pyrolytic Graphite Sheet: A New Type of Adsorption Substrate for Studies of Superfluid Thin Films

Characterization of Pyrolytic Graphite Sheet: A New Type of Adsorption Substrate for Studies of... We have measured the surface morphology and gas adsorption characteristics of an uncompressed pyrolytic graphite sheet (uPGS) which is a candidate substrate for AC and DC superflow experiments on monolayers of $$^4$$ 4 He below $$T= 1\,\hbox {K}$$ T = 1 K . The PGS is a mass-produced thin graphite sheet with various thicknesses between 10 and 100  $$\upmu$$ μ m. We employed a variety of measuring techniques such as imagings with optical microscope, SEM and STM, Raman spectroscopy, and adsorption isotherm. PGS has smooth and atomically flat external surfaces with high crystallinity. Although the specific surface area ( $$\le 0.1\,\hbox {m}^2/\hbox {g}$$ ≤ 0.1 m 2 / g ) is rather small, by making use of its smooth external surface, the thinnest uPGS of $$10\,\upmu \hbox {m}$$ 10 μ m thick is found to be a promising substrate for future superflow experiments on strictly two-dimensional helium systems. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

# Characterization of Pyrolytic Graphite Sheet: A New Type of Adsorption Substrate for Studies of Superfluid Thin Films

, Volume 192 (6) – May 31, 2018
16 pages

Publisher
Springer US
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
D.O.I.
10.1007/s10909-018-1983-3
Publisher site
See Article on Publisher Site

### Abstract

We have measured the surface morphology and gas adsorption characteristics of an uncompressed pyrolytic graphite sheet (uPGS) which is a candidate substrate for AC and DC superflow experiments on monolayers of $$^4$$ 4 He below $$T= 1\,\hbox {K}$$ T = 1 K . The PGS is a mass-produced thin graphite sheet with various thicknesses between 10 and 100  $$\upmu$$ μ m. We employed a variety of measuring techniques such as imagings with optical microscope, SEM and STM, Raman spectroscopy, and adsorption isotherm. PGS has smooth and atomically flat external surfaces with high crystallinity. Although the specific surface area ( $$\le 0.1\,\hbox {m}^2/\hbox {g}$$ ≤ 0.1 m 2 / g ) is rather small, by making use of its smooth external surface, the thinnest uPGS of $$10\,\upmu \hbox {m}$$ 10 μ m thick is found to be a promising substrate for future superflow experiments on strictly two-dimensional helium systems.

### Journal

Journal of Low Temperature PhysicsSpringer Journals

Published: May 31, 2018

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