期刊
ACS NANO
卷 6, 期 9, 页码 7615-7623出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn302745x
关键词
electron spin relaxation rate; graphene nanoribbons; tunneling level states; electron spin resonance; edge spin
类别
资金
- NSF [DMR-0654118]
- Air Force Office of Scientific Research [FA9550-09-1-0581]
- Office of Naval Research MURI Graphene program
- State of Florida
Here we report the results of a multifrequency (similar to 9, 20, 34, 239.2, and 336 GHz) variable-temperature continuous wave (cw) and X-band (similar to 9 GHz) pulse electron spin resonance (ESR) measurement performed at cryogenic temperatures on potassium split graphene nanoribbons (GNRs). Important experimental findings include the following: (a) The multifrequency cw ESR data infer the presence of only carbon-related paramagnetic nonbonding states, at any measured temperature, with the g value independent of microwave frequency and temperature. (b) A linear broadening of the ESR signal as a function of microwave frequency is noticed. The observed linear frequency dependence of ESR signal width points to a distribution of g factors causing the non-Lorentzian line shape, and the g broadening contribution is found to be very small. (c) The ESR process is found to be characterized by slow and fast components, whose temperature dependences could be well described by a tunneling level state model. This work not only could help in advancing the present fundamental understanding on the edge spin (or magnetic)-based properties of GNRs but also pave the way to GNR-based spin devices.
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