English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

In Situ Graphene Growth Dynamics on Polycrystalline Catalyst Foils

MPS-Authors
/persons/resource/persons37960

Wang,  Zhu-Jun
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22243

Willinger,  Marc Georg
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22071

Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

Locator
There are no locators available
Fulltext (public)

acs.nanolett.6b02459.pdf
(Publisher version), 5MB

Supplementary Material (public)
There is no public supplementary material available
Citation

Weatherup, R. S., Shahani, A. J., Wang, Z.-J., Mingard, K., Pollard, A. J., Willinger, M. G., et al. (2016). In Situ Graphene Growth Dynamics on Polycrystalline Catalyst Foils. Nano Letters, 16(10), 6196-6206. doi:10.1021/acs.nanolett.6b02459.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-03CA-0
Abstract
The dynamics of graphene growth on polycrystalline Pt foils during chemical vapor deposition (CVD) are investigated using in situ scanning electron microscopy and complementary structural characterization of the catalyst with electron backscatter diffraction. A general growth model is outlined that considers precursor dissociation, mass transport, and attachment to the edge of a growing domain. We thereby analyze graphene growth dynamics at different length scales and reveal that the rate-limiting step varies throughout the process and across different regions of the catalyst surface, including different facets of an individual graphene domain. The facets that define the domain shapes lie normal to slow growth directions, which are determined by the interfacial mobility when attachment to domain edges is rate-limiting, as well as anisotropy in surface diffusion as diffusion becomes rate-limiting. Our observations and analysis thus reveal that the structure of CVD graphene films is intimately linked to that of the underlying polycrystalline catalyst, with both interfacial mobility and diffusional anisotropy depending on the presence of step edges and grain boundaries. The growth model developed serves as a general framework for understanding and optimizing the growth of 2D materials on polycrystalline catalysts.