Controllable Synthesis and Electrical Conductivities of Cu_7Te_4 Nanostructures

Cu7Te4 nanomaterials with different morphologies including nanobelts with the thickness of 200 nm and the length of several microns,nanoparticles with the diameter of 10-25 nm and micro-flakes consisting of nano par-ticles with the size of about 10 nm were successfully synthesized using different organic solvents(N,N-Dipropylamine,acetone and cyclohexanone) by a solvothermal process.X-ray powder diffraction(XRD),scanning electron micro-scope(SEM),transmission electron microscope(TEM) and high-resolution transmission electron microscope(HRTEM) were employed to characterize the as-obtained products.Furthermore,the electrical conductivities of the samples were studied between room temperature and 400℃.The results reveal that the electrical conductivity of Cu7Te4 nanobelts is much higher than that of the other two samples with different morphologies.The possible mecha-nism and the influence of various solvents on the morphology of products are also discussed.