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.
A novel two-dimensional（2D） Te Se_2 structure with high stability is predicted based on the first-principles calculations. As a semiconductor, the results disclose that the monolayer Te Se_2 has a wide-band gap of 2.392 e V. Interestingly, the indirect-band structure of the monolayer Te Se_2 transforms into a direct-band structure under the wide biaxial strain（0.02–0.12）. The lower hole effective mass than monolayer black phosphorus portends a high carrier mobility in Te Se_2 sheet. The optical properties and phonon modes of the few-layered Te Se_2 were characterized. The few-layer Te Se_2 shows a strong optical anisotropy. Specially, the calculated results demonstrate that the multilayer Te Se_2 has a wide range of absorption wavelength. Our result reveals that Te Se_2 as a novel 2D crystal possesses great potential applications in nanoscale devices, such as high-speed ultrathin transistors, nanomechanics sensors, acousto-optic deflectors working in the UV-vis red region and optoelectronic devices.
