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Synthesis and Physical Properties of SnO2 One-dimensional Composite Nanomaterials

Author: LuoZhiHua
Tutor: TangDongSheng
School: Hunan Normal University
Course: Condensed Matter Physics
Keywords: SnO2 one-dimensional nanocomposite in-situ CVD--Method doped
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 106
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Abstract


SnO2 one-dimensional nanostuctures have attracted considerable attention for their extinguished physical properties and promising applications in optoelectronic devices,gas sensors,transparent electrode, solar cell,and etc.In order to modulate and optimize the optical and electrical properties of SnO2 one-dimensional nanostructures,synthesis and characterization of SnO2 one-dimensional composite nanostructures based on metal-doping has become a hot subject in nanoscience and nanotechnology.In this thesis,by adjusting experimental parameters,such as pressure,distribution of temperature,evaporating velocity of source material,the oxygen density in the carrier gas,one-dimensional SnO2 nanostructures（including nanowires,nanorods,nanobelts and nano -needles） with controllable diameters were successfully prepared by chemical vapor deposition method.Experimental results also indicate that the morphologies of SnO2 nanostructures depend strongly on the density and gradient of Sn and O2 near the growth point.Mo-doped SnO2（MTO） nanowires were synthesized via an in situ doping chemical vapor deposition method.Raman scattering spectra indicate that the lattice symmetry of MTO nanowires lowers with Mo doping,which implies that Mo ions do enter into the lattice of SnO2 nanowire.Ultraviolet-visible diffuse reflectance spectra show that the band gap of MTO nanowires decreases with the increase of Mo concentration.The photoluminescence emission of SnO2 nanowires around 580 nm at room temperature can also be controlled accurately by Mo-doping,which is extremely sensitive to Mo ions and will disappear under the atomic ratio of 0.46%.On the basis of controllable synthesis of SnO2 one-dimensional nanostructures,n-type and p-type semiconducting SnO2 nanowires have been successfully synthesized by In-doping and Sb-doping.And then SnO2 one-dimensional superlattice nanostructures have been successfully fabricated by In-doping and Sb-doping alternately during their growth.Characterization of their nanostructures and properties of which is ongoing.

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