In situ graphene growth dynamics on polycrystalline catalyst foils
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...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Chemical Society
2016
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| _version_ | 1797096483151937536 |
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| author | Weatherup, R Shahani, A Wang, Z Mingard, K Pollard, A Willinger, M Schloegl, R Voorhees, P Hofmann, S |
| author_facet | Weatherup, R Shahani, A Wang, Z Mingard, K Pollard, A Willinger, M Schloegl, R Voorhees, P Hofmann, S |
| author_sort | Weatherup, R |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-07T04:42:30Z |
| format | Journal article |
| id | oxford-uuid:d21e36c2-72ff-4ef3-b237-6bf234674e0d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:42:30Z |
| publishDate | 2016 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:d21e36c2-72ff-4ef3-b237-6bf234674e0d2022-03-27T08:01:40ZIn situ graphene growth dynamics on polycrystalline catalyst foilsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:d21e36c2-72ff-4ef3-b237-6bf234674e0dEnglishSymplectic Elements at OxfordAmerican Chemical Society2016Weatherup, RShahani, AWang, ZMingard, KPollard, AWillinger, MSchloegl, RVoorhees, PHofmann, SThe 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. |
| spellingShingle | Weatherup, R Shahani, A Wang, Z Mingard, K Pollard, A Willinger, M Schloegl, R Voorhees, P Hofmann, S In situ graphene growth dynamics on polycrystalline catalyst foils |
| title | In situ graphene growth dynamics on polycrystalline catalyst foils |
| title_full | In situ graphene growth dynamics on polycrystalline catalyst foils |
| title_fullStr | In situ graphene growth dynamics on polycrystalline catalyst foils |
| title_full_unstemmed | In situ graphene growth dynamics on polycrystalline catalyst foils |
| title_short | In situ graphene growth dynamics on polycrystalline catalyst foils |
| title_sort | in situ graphene growth dynamics on polycrystalline catalyst foils |
| work_keys_str_mv | AT weatherupr insitugraphenegrowthdynamicsonpolycrystallinecatalystfoils AT shahania insitugraphenegrowthdynamicsonpolycrystallinecatalystfoils AT wangz insitugraphenegrowthdynamicsonpolycrystallinecatalystfoils AT mingardk insitugraphenegrowthdynamicsonpolycrystallinecatalystfoils AT pollarda insitugraphenegrowthdynamicsonpolycrystallinecatalystfoils AT willingerm insitugraphenegrowthdynamicsonpolycrystallinecatalystfoils AT schloeglr insitugraphenegrowthdynamicsonpolycrystallinecatalystfoils AT voorheesp insitugraphenegrowthdynamicsonpolycrystallinecatalystfoils AT hofmanns insitugraphenegrowthdynamicsonpolycrystallinecatalystfoils |