期刊
RSC ADVANCES
卷 6, 期 114, 页码 113185-113192出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra23727d
关键词
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资金
- European project GRAFOL
- EPSRC
- Marie Sklodowska-Curie Individual Fellowship (Global) under grant ARTIST from the European Union's Horizon 2020 research and innovation programme [656870]
- Cambridge Overseas Trust
- St John's College Cambridge
- EPSRC Cambridge NanoDTC [EP/L015978/1]
- Japanese Society for the Promotion of Science (JSPS)
- MIUR (PRIN) [2010N3T9M4]
- project ABNANOTECH - MIUR
- In-Kind (PIK) EX-PROREL
- St. John's College, Cambridge
- Engineering and Physical Sciences Research Council [1221067] Funding Source: researchfish
We systematically dope monolayer graphene with different concentrations of nitric acid over a range of temperatures, and analyze the variation of sheet resistance after vacuum annealing up to 300 degrees C. The optimized HNO3 doping conditions yield sheet resistances as low as 180 Omega sq.(-1), which is significantly more stable under vacuum annealing than previously reported values. Raman and photoemission spectroscopy suggest that this stable graphene doping occurs by a bi-modal mechanism. Under mild conditions the dopants are weakly bonded to graphene, but at high acid temperatures and concentrations, the doping is higher and more stable upon post-doping annealing, without causing significant lattice damage. This work shows that large, stable hole concentrations can be induced by transfer doping in graphene.
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