tailieunhanh - Báo cáo hóa học: " Layer-dependent nanoscale electrical properties of graphene studied by conductive scanning probe microscopy"

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: Layer-dependent nanoscale electrical properties of graphene studied by conductive scanning probe microscopy | Zhao et al. Nanoscale Research Letters 2011 6 498 http content 6 1 498 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Layer-dependent nanoscale electrical properties of graphene studied by conductive scanning probe microscopy Shihua Zhao Yi Lv and Xinju Yang Abstract The nanoscale electrical properties of single-layer graphene SLG bilayer graphene BLG and multilayer graphene MLG are studied by scanning capacitance microscopy SCM and electrostatic force microscopy EFM . The quantum capacitance of graphene deduced from SCM results is found to increase with the layer number n at the sample bias of 0 V but decreases with n at -3 V. Furthermore the quantum capacitance increases very rapidly with the gate voltage for SLG but this increase is much slowed down when n becomes greater. On the other hand the magnitude of the EFM phase shift with respect to the SiO2 substrate increases with n at the sample bias of 2 V but decreases with n at -2 V. The difference in both quantum capacitance and EFM phase shift is significant between SLG and BLG but becomes much weaker between MLGs with a different n. The layer-dependent quantum capacitance behaviors of graphene could be attributed to their layer-dependent electronic structure as well as the layer-varied dependence on gate voltage while the layer-dependent EFM phase shift is caused by not only the layer-dependent surface potential but also the layer-dependent capacitance derivation. Keywords graphene scanning capacitance microscopy electrostatic force microscopy layer dependence quantum capacitance Graphene is drawing an increasing interest nowadays since its debut in reality 1 as it is a promising material for future nanoelectronic applications 2-4 . While many transport property studies have been carried out by traditional techniques with nanoelectrodes fabricated on graphene 5-8 conductive scanning probe microscopy has recently been applied for direct nanoscale electrical

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