Journal
ACS NANO
Volume 14, Issue 6, Pages 7492-7501Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c03191
Keywords
few-layer graphene; alkali atom doping; Raman spectroscopy; electron spin lifetime; electron spin resonance
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Funding
- National Research, Development and Innovation Office of Hungary (NKFIH) [K119442, 2017-1.2.1-NKP-2017-00001]
- FWF [P27769-N20]
- German Science Foundation (DFG) [182849149 - SFB 953]
- Swiss National Science Foundation [200021 144419]
- European Research Council (ERC) [670918]
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Today's great challenges of energy and informational technologies are addressed with a singular compound, Li-and Na-doped few-layer graphene. All that is impossible for graphite (homogeneous and high-level Na doping) and unstable for single-layer graphene works very well for this structure. The transformation of the Raman G line to a Fano line shape and the emergence of strong, metallic-like electron spin resonance (ESR) modes attest the high level of graphene doping in liquid ammonia for both kinds of alkali atoms. The spin-relaxation time in our materials, deduced from the ESR line width, is 6-8 ns, which is comparable to the longest values found in spintransport experiments on ultrahigh-mobility graphene flakes. This could qualify our material as a promising candidate in spintronics devices. On the other hand, the successful sodium doping, this being a highly abundant metal, could be an encouraging alternative to lithium batteries.
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