Influence of Au doping on electrical properties of CVD graphene
| Autor: | Carmen Munuera, Wlodek Strupinski, Jon Azpeitia, Aleksandra Krajewska, Iwona Pasternak, Zygmunt Mierczyk, Krzysztof Oberda, María Francisca López, Alejandro Gutiérrez |
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| Přispěvatelé: | European Commission, National Science Centre (Poland) |
| Rok vydání: | 2016 |
| Předmět: |
Kelvin probe force microscope
Materials science Graphene Doping Nanoparticle Nanotechnology 02 engineering and technology General Chemistry Chemical vapor deposition 010402 general chemistry 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Flexible electronics 0104 chemical sciences law.invention X-ray photoelectron spectroscopy law Hall effect General Materials Science 0210 nano-technology |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Carbon |
| Popis: | In this study we report on the effective p-doping of chemical vapor deposition (CVD) graphene transferred from copper foil onto SiO2/Si and PET substrates. Tetrachloroauric acid (HAuCl4) is used to promote graphene doping with a direct correlation between its concentration and modification of graphene's electrical properties. The doping mechanism entails the charge transfer (CT) between AuIII ions and graphene, and the formation of Au nanoparticles (AuNPs) on the surface. X-ray photoelectron spectroscopy (XPS) was employed to confirm this charge transfer, whereas the presence of the AuNPs was verified based on Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) images. The influence of doping on the electrical properties of graphene was assessed by Kelvin Probe Microscopy (KPM) and standard Hall Effect measurements, proving the ability of the method to effectively tune the carrier concentration, achieving sheet resistances as low as 79 Ω/sq. The controlled tuning of the electrical properties together with the use of flexible substrates makes the presented results a very interesting approach enabling the development of a variety of industrial applications, including flexible electronics. The research leading to these results has received funding from the European Union Seventh Framework Programme under grant agreement n°604391 Graphene Flagship. This work was also supported by the EU-FET grant GRAPHENICS618086 and the Polish National Science CentreUMO-2013/09/N/ST5/02481. |
| Databáze: | OpenAIRE |
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