Studies On The Properties Of Gold Point Catalyzed Tin Dioxide Nanowires And Indium-Antimony Doped Tin Dioxide Nanoribbon

Tin dioxide is a type n oxide semiconductor of rutile structure with a band gap of3.6 eV.Thesize of one-dimensional or two-dimensional nano-structures such as tin dioxide nanowires and nanoribbon have reached the nanometer level,and the nanowires have high specific surface area and excellent chemical and physical properties.It is widely used in transparent electrode,solar cell,film resistance and gas sensor.Due to a series of special effects peculiar to nanomaterials,such as quantum size effect and small size effect,the chemical and physical properties of nanomaterials depend on their morphology and size.Therefore,it is a research hotspot of nanomaterials to explore the various morphologies of nanomaterials and the regulation of the micro-structure size of nanomaterials.However,the traditional method of gold membrane catalysis cannot produce the nanowires with small diameter and uniform size.In order to obtain the nanowires with small diameter and uniform size,we used micellar gold dots to catalyze instead of gold film,prepared the tin dioxide nanowires by chemical vapor deposition?CVD?,and analyzed and discussed the growth mechanism of tin dioxide nanowires and tin dioxide.The structure and morphology of the samples were characterized by means of XRD,SEM and TEM.The effects of different preparation conditions on the morphology and optical properties of tin dioxide nanowires were studied.The properties of tin dioxide were investigated by normal temperature photoluminescence?PL?and Raman spectroscopy.The following are the experimental results:?1?the preparation of SnO₂ nanomaterials,namely one-dimensional tin dioxide nanowires,using micellar gold dots catalyzed by chemical vapor deposition with a smaller diameter was studied.The growth mechanism of nanowires was determined to be gas-liquid-solid?VLS?growth.By comparing the PL spectra of nanowires catalyzed by gold particles of different sizes,a wide luminescence peak was obtained at 624nm.By comparing different reaction temperatures,it was found that the PL spectrum shifted red as the temperature increased.In addition,three characteristic peaks at the positions of 475cm^-1,633cm^-11 and 775cm^-11 were observed in the Raman test.Meanwhile,a new Raman peak at 695cm-1 appeared in our sample.?2?In-doped SnO₂?ITO?materials with doping ratios of 2%,5%and 8%were prepared by chemical vapor deposition.As the doping concentration increased,the samples gradually grew from nanowires to nanoribbon.Raman test showed that the peak at 475cm^-1gradually disappeared when the doping ratio reached 5%.PL test showed that when doping increased from 2%to 5%,the luminescence peak showed a red shift,and when the doping ratio reached 8%,the intensity of the luminescence peak was significantly enhanced,and two asymmetric luminescence peaks were observed on both sides of the main luminescence peak.?3?sb-doped SnO₂?ATO?materials with doping ratios of 2%,5%and 8%were prepared by chemical vapor deposition method.With the increase of doping concentration,the surface of nanoribbon gradually grew from nanowire to nanoribbon with rough surface.Raman test showed that the peak at 475cm^-1gradually disappeared when the doping ratio reached 5%,and the peak at 775cm^-11 gradually disappeared when the doping ratio reached 8%,and an inactive Raman peak appeared at 725cm^-1when the doping ratio reached 8%.When PL test ratio was 2%,the luminous peak intensity was significantly higher than that when doping ratio was 5%and 8%,and when doping ratio was 2%,two asymmetric luminous peaks were observed on both sides of the main luminous peak.