Roles of H<subscript>2</subscript> in annealing and growth times of graphene CVD synthesis over copper foil[†].
In: Journal of Materials Chemistry A, Jg. 2 (2014-10-09), Heft 38, S. 16208-16216
Online
academicJournal
Zugriff:
Single-layer and high-quality graphene was synthesized over Cu foil by atmospheric pressure chemical vapor deposition (CVD) without additionally introducing H 2 gas during the growth time. We compared the Cu surface morphology and graphene growth evolution as a function of time, with and without H 2 gas supply during the growth time, by AFM, SEM, EBSD, and Raman spectroscopy. The comparison results suggested that the absence of H 2 gas supply during the growth time caused the orientated wrinkles, small grain size, more grain boundaries on the Cu surface, as well as high graphene quality and a rapid growth rate. The cross sectional TEM, HR-TEM, and SAED indicated the homogeneity and high quality, which was also confirmed by the low sheet resistance of 710 Ω sq -1 . To elucidate the roles of H 2 in the annealing and growth times, we introduced H 2 at the individual stages of heating, growth, and cooling steps. The data showed that graphene could be grown only when H 2 was introduced during the growth time, indicating that the H 2 from CH 4 pyrolysis was not responsible for graphene growth. Therefore, the existence of H 2 during the growth time was essential for graphene growth. This result led us to infer that the H 2 introduced during the annealing time could be released from the bulk Cu to promote graphene growth. The release process was further confirmed by the detection of H 2 concentrations using a hydrogen analyzer. The results are beneficial to highlight the roles of H 2 in the individual reaction steps for the controllable synthesis of graphene. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Chemistry A is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Titel: |
Roles of H<subscript>2</subscript> in annealing and growth times of graphene CVD synthesis over copper foil[†].
|
---|---|
Autor/in / Beteiligte Person: | Jin, Yan ; Hu, Baoshan ; Wei, Zidong ; Luo, Zhengtang ; Wei, Dapeng ; Xi, Yi ; Zhang, Ye ; Liu, Yunling |
Link: | |
Zeitschrift: | Journal of Materials Chemistry A, Jg. 2 (2014-10-09), Heft 38, S. 16208-16216 |
Veröffentlichung: | 2014 |
Medientyp: | academicJournal |
ISSN: | 2050-7488 (print) |
DOI: | 10.1039/c4ta02557a |
Sonstiges: |
|