tailieunhanh - Báo cáo hóa học: " Ultrafast nano-oscillators based on interlayerbridged carbon nanoscrolls"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Ultrafast nano-oscillators based on interlayerbridged carbon nanoscrolls | Zhang and Li Nanoscale Research Letters 2011 6 470 http content 6 1 470 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Ultrafast nano-oscillators based on interlayer-bridged carbon nanoscrolls Zhao Zhang1 and Teng Li1 2 Abstract We demonstrate a viable approach to fabricating ultrafast axial nano-oscillators based on carbon nanoscrolls CNSs using molecular dynamics simulations. Initiated by a single-walled carbon nanotube CNT a monolayer graphene can continuously scroll into a CNS with the CNT housed inside. The CNT inside the CNS can oscillate along axial direction at a natural frequency of tens of gigahertz. We demonstrate an effective strategy to reduce the dissipation of the CNS-based nano-oscillator by covalently bridging the carbon layers in the CNS. We further demonstrate that such a CNS-based nano-oscillator can be excited and driven by an external AC electric field and oscillate at more than 100 GHz. The CNS-based nano-oscillators not only offer a feasible pathway toward ultrafast nano-devices but also hold promise to enable nanoscale energy transduction harnessing and storage . from electric to mechanical . Keywords carbon nanoscroll graphene carbon nanotube nano-oscillator molecular dynamics Introduction Significant research progress on graphene in past several years has enabled the exploration of carbon nanoscrolls CNSs 1-3 a one-dimensional carbon nanomaterial that is distinct from carbon nanotubes CNTs . A CNS is formed by rolling up a monolayer graphene into a spiral multilayer nanostructure whose core size is highly tunable by relative sliding between adjacent layers 4 5 . In other words a CNS is topologically open fundamentally distinct from a tubular CNT which is topologically closed . whose core size can only be changed slightly by stretching the carbon-carbon C-C bonds . The open and highly tunable structure of CNSs combining with the exceptional mechanical and electronic properties .