SnO2纳米颗粒制备及其对溶胶-凝胶Sb:SnO2薄膜性能的影响

以Sn(OEt)2为起始原料,采用水热晶化法合成了分散性良好的金红石结构的SnO2纳米颗粒.采用X射线衍射对其进行了表征,表明SnO2纳米颗粒的结晶性良好,颗粒尺寸小于10nm.将合成的SnO2纳米颗粒均匀分散到SbSnO2镀膜液中,经陈化后制成镀膜溶胶,以溶胶-凝胶浸渍镀膜工艺制备纳米颗粒掺杂SbSnO2薄膜.分别采用范德堡(Van Der Pauw)法、UV/VIS分光光度计和FTIR中红外分析仪测量并分析膜层的导电性能、光学性能及结构特征,研究了导电纳米颗粒添加对SbSnO2薄膜电性能、光学性能和结构的影响.     

喷雾热解法制备SnO2:F+Sb薄膜的结构及性能研究

采用喷雾热解法在玻璃基板上制备了SnO2F+Sb薄膜,对薄膜的结构及性能进行了研究.用STM对薄膜表面进行表征,发现薄膜表面光滑平整,粗糙度Ra为16.283nm.四探针测试仪测定薄膜方阻为60Ω/□,电阻率为2.1×10-3Ω·Cm.用XRD表征薄膜结构,薄膜为四方相多晶SnO2结构,说明掺杂没有该变薄膜结构.对薄膜的光学性能进行了测试,可见光透过率达到80%,在2500nm处的中远红外区反射率由镀膜前的6%上升到36%.按国家标准测试了镀膜玻璃耐酸碱稳定性,实验前后薄膜的可见光透过率变化＜3%,符合国家标准.同时本研究还对镀膜玻璃的保温性能进行了测试,结果表明本实验制备的镀膜玻璃具有较好的保温性能.     

射频磁控溅射有机衬底SnO2∶Sb透明导电膜性能的研究

采用射频磁控溅射法在聚丙烯己二酯有机薄膜(polypropylene adipate, PPA)衬底上低温制备出锑掺杂的氧化锡(SnO2∶Sb)透明导电膜.研究了薄膜的厚度效应对SnO2∶Sb薄膜的结构、光学和电学特性的影响.制备薄膜为多晶膜,并且保持了纯二氧化锡的金红石结构.载流子浓度和迁移率随着薄膜厚度的增加而增大,电阻率随着薄膜厚度的增加而减小,最低电阻率为 2×10-3Ω*cm.     

射频磁控溅射有机衬底SnO2：Sb透明导电膜性能的研究

采用射频磁控溅射法在聚丙烯己二酯有机薄膜(polypropylene adipate, PPA)衬底上低温制备出锑掺杂的氧化锡(SnO2∶Sb)透明导电膜.研究了薄膜的厚度效应对SnO2∶Sb薄膜的结构、光学和电学特性的影响.制备薄膜为多晶膜,并且保持了纯二氧化锡的金红石结构.载流子浓度和迁移率随着薄膜厚度的增加而增大,电阻率随着薄膜厚度的增加而减小,最低电阻率为 2×10-3Ω*cm.     

SnO_2基陶瓷的制备及其性能研究

以纳米SnO2粉末为原料制备导电陶瓷,研究了所制备的SnO2-Sb2O3-CuO三元系SnO2基陶瓷的烧结性能和导电性能。用光学显微镜、扫描电镜和X射线能谱仪等对陶瓷基体的相组成和微观组织进行了分析。结果表明,纳米SnO2粉末在加入一定量的Sb2O3和CuO添加剂后,烧结活性有所提高;加入烧结助剂CuO可明显促进SnO2的烧结;在最佳CuO-Sb2O3配比下,制备的SnO2基陶瓷的综合性能良好。     

SnO2纳米薄膜的溶胶-凝胶法制备及气敏性能

以SnCl2·2H2O和无水乙醇为原料制备SnO2透明溶胶,通过浸渍法在云母基片上制备了SnO2纳米薄膜.利用XRD和AFM手段研究了薄膜的结构和形貌,结果表明,SnO2纳米薄膜的球形粒径约为15nm;随着薄膜沉积层数的增加或工作温度的升高,薄膜电阻逐渐减小.气敏特性研究表明,薄膜对H2有较好的敏感性.     

SnO2膜导电玻璃性能的研究

采用喷镀法制备SnO2 膜导电玻璃 ,研究了膜厚、基底温度对薄膜电阻和透光率的影响。用SEM、XPS和XRD分析了SnO2 膜的形貌与导电性能 ,并研究了其透光性、反射性及热稳定性。结果表明 :SnO2 膜是多晶结构氧空位导电的N型半导体 ,在可见光范围内透光率达 88%以上并具有较好的热稳定性     

稀土Nd掺杂纳米SnO2薄膜特性

对采用真空气相沉积法在玻璃衬底上制备的稀土Nd掺杂的SnO2薄膜,进行结构、电学及光学特性的测试分析.实验表明:氧化、热处理条件为500 ℃、45 min时样品性能好.采用一步成膜工艺法制备的SnO2薄膜晶粒度较小,随掺Nd浓度的增大,从31.516 nm减小到25.927 nm;两步成膜工艺法制备的SnO2薄膜晶粒度随掺Nd浓度的增大,从45.692 nm增至66.256 nm.XRD分析,掺Nd(5 at%)薄膜沿[110]、[101]晶向的衍射峰加强,薄膜呈多晶结构.掺Nd可使薄膜透光率下降,而薄膜的薄层电阻随热处理温度升高和掺Nd浓度的增大,呈先降后升趋势.     

TiO2/SnO2复合薄膜光诱导超亲水性机理的XPS研究

利用X射线光电子能谱仪对用溶胶-凝胶法制备的TiO2/SnO2复合薄膜的表面化学状态进行分析,结果表明:热处理及紫外光照前后,薄膜表面的化学状态均发生了变化,薄膜表面的碳氧或过氧化物基团增加,这些基团具有较强的活性,通过氢键和水中的极性基团作用,产生超亲水性.此外,掺杂SnO2提高了TiO2/SnO2复合薄膜的表面能,改变了薄膜表面的化学结构,使TiO2薄膜获得了较好的亲水性能和催化活性.     

喷雾热解法制备SnO_2∶F+Sb薄膜的结构及性能研究

采用喷雾热解法在玻璃基板上制备了SnO2∶F+Sb薄膜,对薄膜的结构及性能进行了研究。用STM对薄膜表面进行表征,发现薄膜表面光滑平整,粗糙度Ra为16.283nm。四探针测试仪测定薄膜方阻为60Ω/□,电阻率为2.1×10-3Ω.cm。用XRD表征薄膜结构,薄膜为四方相多晶SnO2结构,说明掺杂没有该变薄膜结构。对薄膜的光学性能进行了测试,可见光透过率达到80%,在2500nm处的中远红外区反射率由镀膜前的6%上升到36%。按国家标准测试了镀膜玻璃耐酸碱稳定性,实验前后薄膜的可见光透过率变化<3%,符合国家标准。同时本研究还对镀膜玻璃的保温性能进行了测试,结果表明本实验制备的镀膜玻璃具有较好的保温性能。     

Interfacial Structure of Nanocrystalline SnO2 and SiO2-doped SnO2

Tindioxideisoneofthemostimp0rtantmaterialsforsens0rs.Inthisletter,theinterfacialstructuresofn-SnO2andn-Si-SnO2(d0pedwith5wtpctSiO2)samplespreparedbythesol-gelpr0cesshavebeenin-vestigatedbyX-raydiffraction(XRD),p0sitronlife-timespectr0sc0pyand119SnM6ssbauerspectr0scopy.Variati0nsofgrainsizeforn-SnO2andn-Si-SnO2sampleswithsinteringtemperatureshowthatthegrowthhastw0stageswithincreasingtempera-ture.Thecrystallizationtemperatureisab0ut5O0'C.Whenthesinteringtemperaturewaslowerthanthecrystall…     

SnO2-Zn2SnO4复合陶瓷的介电性质研究

通过传统陶瓷制备工艺制备了致密的SnO2-Zn2SnO4复合陶瓷,研究了不同SnO2、Zn2SnO4复合比例对陶瓷介电性质的影响及其高介电性质产生的机理。研究发现,40Hz时,该复合陶瓷的相对介电常数高达104,远高于SnO2、Zn2SnO4陶瓷,且样品的相对介电常数、导纳随组分的变化规律一致。进一步研究发现,样品的电容随着施加偏压的变化满足肖特基势垒电容公式,这表明,SnO2-Zn2SnO4复合陶瓷的高介电行为起源于晶界处的双肖特基势垒。     

Growth of IrO2, SnO2, and SnO2:IrO2 crystals

Crystals of IrO₂, SnO₂, and SnO₂:IrO₂ have been grown by chemical vapor transport. The IrO₂ crystals are larger than any previously reported. The SnO₂ and SnO₂:IrO₂ crystals are optically clear and are suitable for optical properties studies. This is the first report on the growth of SnO₂:IrO₂ crystals.     

Luminescence efficiency of SnO2:Eu and rate of SnO oxidation

Abstracts are not published in this journal This revised version was published online in November 2006 with corrections to the Cover Date.     

Nanofibers Comprising Yolk–Shell Sn@void@SnO/SnO2 and Hollow SnO/SnO2 and SnO2 Nanospheres via the Kirkendall Diffusion Effect and Their Electrochemical Properties

Nanofibers with a unique structure comprising Sn@void@SnO/SnO₂ yolk–shell nanospheres and hollow SnO/SnO₂ and SnO₂ nanospheres are prepared by applying the nanoscale Kirkendall diffusion process in conventional electrospinning process. Under a reducing atmosphere, post‐treatment of tin 2‐ethylhexanoate‐polyvinylpyrrolidone electrospun nanofibers produce carbon nanofibers with embedded spherical Sn nanopowders. The Sn nanopowders are linearly aligned along the carbon nanofiber axis without aggregation of the nanopowders. Under an air atmosphere, oxidation of the Sn–C composite nanofibers produce nanofibers comprising Sn@void@SnO/SnO₂ yolk–shell nanospheres and hollow SnO/SnO₂ and SnO₂ nanospheres, depending on the post‐treatment temperature. The mean sizes of the hollow nanospheres embedded within tin oxide nanofibers post‐treated at 500 °C and 600 °C are 146 and 117 nm, respectively. For the 250th cycle, the discharge capacities of the nanofibers prepared by the nanoscale Kirkendall diffusion process post‐treated at 400 °C, 500 °C, and 600 °C at a high current density of 2 A g^?1 are 663, 630, and 567 mA h g^?1, respectively. The corresponding capacity retentions are 77%, 84%, and 78%, as calculated from the second cycle. The nanofibers prepared by applying the nanoscale Kirkendall diffusion process exhibit superior electrochemical properties compared with those of the porous‐structured SnO₂ nanofibers prepared by the conventional post‐treatment process.     

Microstructural investigation and SnO nanodefects in spray-pyrolyzed SnO2 thin films

Spray pyrolysis is one of the most cost-effective methods to prepare SnO₂ films due to its ability to deposit large uniform area, low fabrication cost, simplicity and low deposition temperature. Conventionally, scanning electron microscopy (SEM) and X-Ray Diffraction (XRD) are routinely used to investigate microstructure and crystal structure of the SnO₂ films. In the present study, the SnO₂ films were deposited by spray pyrolysis at 300, 400 and 500 °C and the microstructure of the 500 °C film was further examined by using transmission electron microscopy (TEM) and convergent beam electron diffraction (CBED). It was found that large grain-size vertically-aligned columnar SnO₂ grains were formed after a few layers of small grain-size randomly oriented SnO₂ grains. Moreover, CBED showed the presence of SnO nanodefects that had not been reported before and could not be detected by SEM or XRD.     

Properties of SnO2-based ceramics

Some SnO₂-based ceramics of the ternary and binary systems SnO₂-Sb₂O₃-CuO have been prepared and some of their properties have been measured. It was observed that most of their properties, which include density, porosity, d.c. electrical conductivity, as well as the crystal occurrence, were dependent on the presence of CuO. Crystal phase occurrence was investigated using the X-ray diffraction technique and it was found that the phases were predominantly SnO₂ and Sb₂O₄ crystals. The d.c. conductivity at different sintering temperatures was found to be enhanced by the simultaneous presence of Sb₂O₃ and CuO.