Effect of thickness and substrate type on the structure and low vacuum photoemission of carbyne-containing films

Monoatomic carbon chains and carbyne-rich composites are promising materials for many applications from protective coatings to nanoelectronic devices. Therefore, a thorough understanding of both the atomic and electronic structure of chained carbon is important. In this study, a combination of Raman...

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Bibliographic Details
Published in:Carbon (New York) 2019-11, Vol.152, p.388-395
Main Authors: Buntov, E.A., Zatsepin, A.F., Slesarev, A.I., Shchapova, Yu.V., Challinger, S., Baikie, I.
Format: Article
Language:English
Subjects:
Atomic structure
Carbon
Carbon chains
Carbyne
Composite
Composite structures
Copper
Dependence
Electrical equipment
Electron emission
Electronic structure
Electrons
Energy structure
Low vacuum
Mapping
Molecular chains
Morphology
Nanoelectronics
Nanomaterials
Nanotechnology devices
Photoelectric emission
Photoelectron emission
Pressure
Protective coatings
Raman
Raman spectra
Silicon substrates
Thickness
Thin films
Work functions
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Summary:Monoatomic carbon chains and carbyne-rich composites are promising materials for many applications from protective coatings to nanoelectronic devices. Therefore, a thorough understanding of both the atomic and electronic structure of chained carbon is important. In this study, a combination of Raman scattering and electron photoemission techniques is used to study the bonding types, electron work functions and band gaps for carbyne-containing films on copper and silicon substrates. Raman mapping shows the nonuniform distribution of sp1 hybridization across the carbon-coated area on polycrystalline copper substrate due to adhesion differences. UV-excited electron emission dependence on thickness and ambient pressure confirms the difference between the silicon- and copper-based samples. Comparison with DFT calculations performed on surface slab models allows to draw conclusions about the chained composite structure. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2019.06.042