| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 608041 | Journal of Colloid and Interface Science | 2013 | 5 Pages |
The effects of microstructures and surface states on the field emission, which are important to a good understanding of the field emission mechanism, are unclear. In this paper, the microstructures and surface states of graphene–Sn/SnO2 hybrids were analyzed, and the field emission mechanism was explored. Raman spectra and images revealed that SnO2/Sn droplets are strongly bound on graphene surface, and there exist oxygen vacancies at the surface of graphene–Sn/SnO2 hybrids. Among X-ray photoelectron spectroscopy spectra, the peak of O 1s shifts 1.6 eV toward higher binding energies in the 5 min sample with the best field emission properties, which indicates that the field emission improvement in graphene–Sn/SnO2 hybrids arises from the band-bending effect and a lower work function.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (78 K)Download as PowerPoint slideHighlights► The microstructures and surface states of graphene–Sn/SnO2 hybrids were analyzed. ► The field emission mechanism was explored based on experimental results. ► The electron emission arises from the band-bending effect and a lower work function.
