Synthesis, Characterization And Property Study Of Se、Te And Their Compounds

In this paper, we synthesized One-Dimensional Se, CoSenanomaterials and noble metal/Te heterostructure through wet-chemicalmethods. The structural characterization and formation mechanisms ofthe as-prepared samples were studied in details. In addition, theelectrochemical properties of some samples were also explored. The mainresults were summarized as follows:1. We studied the role of alkaline during the conversion processfrom a-Se to t-Se nanowires in ethanol solve at room temperature. Theresults showed that a-Se can automatically convert to t-Se in ethanol, butthe alkaline can dramatically promote the conversion speed. t-Senanowires or nanotubes can be selectively obtained in certainconcentration of sodium hydrate ethanol solution These results may behelpful to understand the conversion mechanism from a-Se to t-Se.2. Te nanowires were synthesized through a hydrothermal processwith the assistance of hydrazine hydrate. Then surfactant and noble metalions were added into above solution and noble metal/Te heterostructureformed. The experimental results showed that surfactants played crucialrole in the attachment of noble metal to Te nanowires. The obtainedsamples were characterized and their electrochemical properties were alsostudied.3、CoSe nanotubes formed through the reaction between NaHSe and Co（CO₃）_0.35Cl_0.20（OH）_1.10nanorods which formed by a hydrothermalprocess and acted as precursor The structural and morphologicalcharacterization and formation mechanism of the as-obtained sampleswere studied. And the result indicated that nanoscale Kirkendall effectplayed pivotal role during the formation process of the CoSe nanotubese.Additionally, the electrochemical properties of CoSe nanotubes were alsostudied.