TY - JOUR
T1 - Characterization of Pyrolytic Graphite Sheet
T2 - A New Type of Adsorption Substrate for Studies of Superfluid Thin Films
AU - Nakamura, Sachiko
AU - Miyafuji, Daisuke
AU - Toda, Ryo
AU - Matsui, Tomohiro
AU - Fukuyama, Hiroshi
N1 - Funding Information:
We are grateful to Yoshiya Sakaguchi, Hiroyuki Hase, and Makoto Nagashima of Automotive & Industrial Systems Company of Panasonic corporation for providing us the uPGS and cPGS samples. We also thank Hideki Sato for his assistance in the STM measurement and Takenori Fujii for his contribution in the energy-dispersive X-ray spectroscopy measurement. The laser Raman microscope used in this work was supplied by MERIT program, The University of Tokyo. This work was financially supported by Grant-in-Aid for Scientific Research (B) (Grant No. 15H03684), and Challenging Exploratory Research (Grant No. 15K13398) from JSPS.
Publisher Copyright:
© 2018, Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2018/9/1
Y1 - 2018/9/1
N2 - 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 4He below T=1K. The PGS is a mass-produced thin graphite sheet with various thicknesses between 10 and 100 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 (≤0.1m2/g) is rather small, by making use of its smooth external surface, the thinnest uPGS of 10μm thick is found to be a promising substrate for future superflow experiments on strictly two-dimensional helium systems.
AB - 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 4He below T=1K. The PGS is a mass-produced thin graphite sheet with various thicknesses between 10 and 100 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 (≤0.1m2/g) is rather small, by making use of its smooth external surface, the thinnest uPGS of 10μm thick is found to be a promising substrate for future superflow experiments on strictly two-dimensional helium systems.
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U2 - 10.1007/s10909-018-1983-3
DO - 10.1007/s10909-018-1983-3
M3 - Article
AN - SCOPUS:85047955927
SN - 0022-2291
VL - 192
SP - 330
EP - 345
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
IS - 5-6
ER -