Preparation, Characterization And Photoluminescence Properties Of Transparent Conducting Oxide Nanowires By Carbothermal Reduction Method

Transparent conducting oxides (TCOs) have attracted considerable attention in recent years for their potential applications in the development of nanoscale electronic and optoelectronic devices. People put more researches on TCOs nanowires, nanorods, nanoparticles and films. In this paper, one-dimensional transparent conducting oxide nanomaterials, such as ITO (In-doped SnO2), In2O3, Ga2O3 have been synthesized by thermal evaporation.The morphology, structure, chemical composition and physical properties of these quasi-one-dimensional naostructures are characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDS) and photoluminescence (PL) spectroscopy. Some novel methods to synthesize quasi-one-dimensional nanostructures have been developed. The growth mechanisms of products of different morphologies are further investigated. The relationship between photoluminescence properties and the morphologies is discussed. The following are the main contents and conclusions:1. Synthesis and optical properties of single-crystalline In-doped SnO2 zigzag-shaped nanostructuresSingle-Crystalline In-doped SnO2 zigzag-shaped nanostructures were synthesized successfully by a carbothermal reduction method with VS growth.. The structures, morphologies, and compositions of the calcined products have been characterized by powder X-ray diffraction(XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDS) analysis and photoluminescence spectroscopy(PL). The results reveal that the as-synthesized In-doped SnO2 zigzag-shaped nanostructures have tetragonal rutile structure, with high crystallinities and lengths of up to tens of micrometers. A possible growth mechanism for the formation of different morphologies was proposed. The photoluminescence property of the zigzag nanostructures at room temperature was also investigated. 2. Synthesis and optical properties of single-crystalline In2O3 nanowires by a carbothermal reduction processHigh yields of single-crystalline In2O3 nanowires were synthesized by a carbothermal reduction process under Ar/O2 mixed atmosphere. Indium oxide and carbon powders mixed completely before the thermal evaporation process. The experiment did not use the catalyst and substrate. The structures, morphologies, and compositions of the calcined products have been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray (EDS) analysis. VS growth mechanism of nanowires was considered the main growth mechanism. The photoluminescence spectrum under room temperature shows that the light-emitting centers at 383 nm.3. Synthesis and optical properties of Single-Crystalline Ga2O3 NanobeltsBy a carbothermal reduction synthesis process, Ga2O3 Nanobelts were synthesized successfully at 1050℃. The structures, morphologies, and compositions of the calcined products have been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray (EDS) analysis. The results reveal that the as-synthesized nanobelts have high crystallinities and lengths of up to tens of micrometers. Photoluminescence results show that the gallium oxide nanobelts have a strong ultraviolet light emitting.