Changhua An

Growth of belt-like SnS crystals from ethylenediamine solution

Tin (II) sulfide crystal belts, with tens of micrometers in width, several millimeters in length and several micrometers in thickness, was successfully grown in ethylenediamine (en) via a solvothermal route at low temperature. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), induced-coupled plasma (ICP), X-ray photoelectron spectra (XPS). The vibrational property of the as-prepared SnS belt was examined by Raman spectra. The possible growth mechanism of SnS crystal belts was discussed, which revealed that the solvent (en) was crucial in the formation of belt-like SnS crystals.

Hydrothermal preparation of α-MnS nanorods from elements

A simple and convenient elemental-direction-reaction route has been successfully developed to prepare α-MnS nanorods under hydrothermal conditions using manganese and sulfur powder as starting materials in the temperature range of 240–260°C. It was found that the temperature was a key factor influencing the phase purity of the titled compound. A possible formation mechanism of the α-MnS nanorods was proposed on the basis of our contrast experimental results, which revealed that α-MnS nanorods were formed via an in situ sulfiding Mn(OH)2 nanorods produced by the reaction of manganese and water.

Selective synthesis and characterization of famatinite nanofibers and tetrahedrite nanoflakes

High quality semiconducting famatinite (Cu3SbS4) nanofibers and tetradrite (Cu12Sb4S13) nanoflakes have been selectively synthesized through mild hydrothermal and solvothermal synthesis routes, respectively. The morphology and phase of the products can be successfully controlled by choosing appropriate reaction media to adjust the dynamics of the reaction process. It was found that reaction temperature is an important factor influencing the phase purity of the products. This method may provide a general route for the selective preparation of other semiconducting multinary sulfide nanocrystallites.

Blue-light emission of nanocrystalline CaS and SrS synthesized via a solvothermal route

Abstract CaS and SrS nanocrystallites have been successfully synthesized via a solvothermal route by the reaction between XCl 2 (X=Ca, Sr) and sulfur at relatively lower temperature for the first time. XS (X=Ca, Sr) nanocrystallites are efficient emission luminescence in comparison with that of bulk materials at room temperature. The emitted light of CaS and SrS nanocrystallites is yellow–green and blue, respectively.

Hydrothermal synthesis and characterization of AgInSe2 nanorods

Abstract Chalcopyrite AgInSe 2 nanorods were synthesized via a convenient hydrothermal route using AgNO 3 , InCl 3 ·4H 2 O, selenium powder and hydrazine hydrate as reagents at relatively low temperature. The hydrazine hydrate acting as both the reducing agent and coordinator was found to play a very important role in the formation of the rod-like morphologies of the final product. The influences of temperature and time on the formation of the target compound were investigated. Several techniques including XRD, XPS, TEM and Raman spectrum were used to characterize the products.

Hydrothermal preparation of luminescent PbWO4 nanocrystallites

Abstract Lead tungstate (PbWO 4 ), an important inorganic scintillator, was synthesized via a mild hydrothermal reaction route. X-ray diffraction (XRD) and a transmission electron microscope (TEM) were used to characterize the products. The effects of solvents, reagents, reaction temperature, and time on the formation of the PbWO 4 nanocrystalites were investigated. The examination of photoluminescence (PL) property of the as-prepared samples revealed that the PL of the as-prepared PbWO 4 nanocrystalites was strongly dependent on the preparation conditions.

The influences of surfactant concentration on the quality of chalcostibite nanorods

Abstract A low temperature surfactant-assisted hydrothermal synthesis route has been successfully developed for the preparation of high quality chalcostibite (CuSbS2) nanorods. The surfactant concentration is a key factor influencing the quality (size, shape) of the final products. A possible mechanism is proposed for the formation of chalcostibite nanorods. Several techniques including XRD, SEM, TEM and XPS were used to characterize the as-prepared chalcostibite nanorods.

Synthesis of novel SbSI nanorods by a hydrothermal method

Abstract SbSI nanorods have been prepared by a known hydrothermal method at 180–190°C for the first time. X-ray diffraction patterns, transmission electron microscopy, and X-ray photoelectron spectra (XPS) are used to characterize the products. The as-synthesized SbSI crystalline displays a rod-like morphology with diameters of 20–50 nm and lengths up to several micrometers. The fundamental absorption edge of the SbSI nanorods is shifted to the shorter wavelength in comparison with that of bulk SbSI crystals. A possible mechanism for the formation of the SbSI nanorods is proposed.

Solution-phase synthesis of monodispersed SnTe nanocrystallites at room temperature

Abstract Monodispersed semiconducting SnTe nanocrystallites was successfully prepared via a solution synthesis route at room temperature. It was found that solvent (ethylenediamine), reductant (KBH4), and tin source (liquid SnCl4) were crucial factors in the preparation of the titled nanocrystals. X-ray powder diffraction (XRD), transmission electronic microscopy (TEM), X-ray photoelectron spectroscopy (XPS) were used to characterize the product. Raman spectrum of the as-prepared sample had a red shift by five or six wavenumbers in comparison with that of the SnTe single crystals.

Hydrothermal synthesis and characterization of CuIn2.0Se3.5 nanocrystallites

Nanocrystalline CuIn2.0Se3.5 was successfully synthesized via a convenient hydrothermal route at relatively low temperature. By changing the selenium sources, the shape of the products can be effectively controlled. The as-prepared products were characterized by X-ray powder diffraction (XRD), transmission electron microscope (TEM) and Raman spectrum. X-ray photoelectron spectroscopy (XPS) analysis proved the product was ternary compound without secondary phase in it. The factors influencing the formation of the CuIn2.0Se3.5 were investigated.