Solvothermal synthesis of polycrystalline tellurium nanoplates and their conversion into single crystalline nanorods

Abstract

Uniform and polycrystalline tellurium nanoplates with a thickness of 100-300 nm can be rapidly synthesized by a simple solvothermal method in mixtures of water and ethanediamine at 180 C with the assistance of glucose. By adjusting the concentration of glucose, tellurium microrods and nanoplates can be prepared. Based on the electron microscope observations, a possible mechanism involved the self-assembly process and dissolution-recrystallization mechanism is proposed for explaining the formation of polycrystalline tellurium nanoplates and their transformation into single crystalline nanorods. Furthermore, the Raman scattering measurement for the different morphologies is conducted, and the polycrystalline nanoplates present the stronger Raman scattering spectrum.

Development of CdMnTe thin films using electroplating technique for opto-electronic device applications

“…Figure 10 (b) is the SEM image of heat-treated CdMnTe layers. Parts of the grains are rod-shaped which is a nature of Tellurium[19]. This further confirms the result from PEC cell measurement discussed in sub section 3.5.1 that CdMnTe when heat-treated ordinarily in air without any chemical treatment convert to p-type regardless of the cathodic potentials in which the material is grown.…”

Aspect ratio controlled synthesis of tellurium nanowires for photovoltaic applications

“…The mode with a vibration 117.0 cm À1 corresponds to A 1 mode, 136.1 cm À1 corresponds to E 2 mode and the bands at 265.9 cm À1 assigned to the second-order spectra of the Te NWs which agrees closely with previous reports. 49,50 Next, we investigated and analyzed the effect of Te NWs as a HTL on CdTe PV devices. Tellurium manifests as a p-type semiconductor, and has been reported with a majority carrier concentration of 2.65 Â 10 18 cm À3 , Hall mobility of 8.99 cm 2 V À1 S À1 , and resistivity of 0.26 O cm.…”

One-Pot Hydrothermal Synthesis of Thin Tellurene Nanosheet and Its Formation Mechanism

“…The formation process of Te nanosheets can be made up of two main parts of nucleation and growth: in the initial reaction between 1 h and 2 h, some nanoparticles of Te are produced through the gathering of the primary seed nucleus by the reduction of Te 4+ to the Te atom using hydrazine hydrate as a reductant. And this primary nucleus with high surface energies is thermodynamically metastable which prefers to aggregate into bigger nanoparticles for minimizing its interfacial energies [35,36]. After that, with the increase of time, these Te nanoparticles can gradually dissolve into the PVP solution and release more Te nuclei with a hexagonal shape of polar and nonpolar facets.…”