Journal
NANO RESEARCH
Volume 6, Issue 9, Pages 671-678Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-013-0342-6
Keywords
graphene transfer; clean; etching free; CO intercalation; Pt foils
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Funding
- Ministry of Science and Technology of China [2011CB921903, 2012CB921404, 2012CB933404, 2013CB932603, 2011CB933003]
- National Natural Science Foundation of China [21073003, 51222201, 51290272, 51121091, 51072004]
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Noble metals such as Pt are a perfect substrate for the catalytic growth of monolayer graphene. However, the requirements of the subsequent transfer process are not compatible with the traditional etching method. In this work, we find that the interaction of graphene with Pt foil can be weakened through the intercalation of carbon monoxide (CO) under ambient pressure. This intercalation process occurs on both hexagonal-shape graphene islands and irregular graphene patches on changing the CO partial pressure from 0 to 0.6 MPa, as observed by scanning electron microscopy (SEM), Raman spectroscopy and X-ray photoemission spectroscopy. We demonstrate that, on a practical timescale, the intercalation ratio is proportional to the partial pressure of CO. Furthermore, we develop a clean transfer method of CO-intercalated graphene with water as a peeling agent. We show that this method enables the transfer of tens of micrometer-scale graphene patches onto SiO2/Si, which are free from metal or oxide particle contamination. This transfer method should be a significant step towards the clean transfer of graphene, as well as the recyclable use of noble metal substrates.
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