Although SnO_2-based nanomaterials used to be considered as being extraordinarily versatile for application to nanosensors,microelectronic devices, lithium-ion batteries, supercapacitors and other devices, the functionalities of SnO_2-based nanomaterials are severely limited by their intrinsic vulnerabilities. Facile electrospinning was used to prepare SnO_2 nanofibers coated with a protective carbon layer. The mechanical properties of individual core-shell-structured SnO_2@C nanofibers were investigated by atomic force microscopy and the finite element method. The elastic moduli of the carbon-coated SnO_2 nanofibers remarkably increased, suggesting that coating SnO_2 nanofibers with carbon could be an effective method of improving their mechanical properties.
本文基于第一性原理计算预测了一种新颖的二维稳定结构TeSe_2,结果显示单层TeSe_2是一种半导体材料,其带隙值为2.392 e V.有趣的是单层TeSe_2的间接能带在宽范围的双向负应变(0.02~0.12)作用下转变为直接能带.比单层黑磷烯更小的有效空穴电子质量预示了TeSe_2具有更高的载流子迁移速率.此外,对不同厚度TeSe_2的声子模及光学性质也进行了计算,结果显示不同厚度的TeSe_2具有较强的光学各向异性,尤其是多层TeSe_2具有更宽的吸收波长.这些结果表明,TeSe_2作为一种新颖的二维结构在纳米器件领域具有巨大的应用潜力,如高速超薄晶体管,纳米力学传感器,紫外–可见红光区声光偏振器及光电子器件等.
