首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 15 毫秒
1.
Monodisperse indium tin oxide nanoparticles (ITO NPs) with high crystallinity have been synthesized by the rapid thermal injection method and the seed-mediated growth method. We demonstrate that the surface plasmon resonance (SPR) frequencies of ITO NPs can be manipulated from 1,600 to 1,993 nm in near-infrared band by controlling the composition, size, and morphology. The doping Sn concentration in ITO NPs could be controlled via changing the %Sn in the initial feed from 0% to 30%. The shortest SPR wavelength at 1,600 nm with 10% Sn doping concentration indicates highest free electron carrier concentration in ITO NPs, which has direct relationship with doping Sn4+ ions. Furthermore, we demonstrate that the SPR peaks can also be tuned by the size of ITO NPs in the case of uniform doping. Besides, compared with the ITO NPs, single crystalline ITO with nanoflower morphology synthesized through the one-pot method exhibit SPR absorption peak features of red-shifting and broadening.  相似文献   

2.
Indium tin oxide nanoparticles with shapes varying from sphere to cubic were synthesized by controlling the ratio of the concentrations of the protective polymer (PVP) to indium tin oxide precursor in their preparation by co-precipitation. Transmission electron microscopy was used to determine the size and shape. The XPS spectra of the particles revealed that the atomic ratios of In:Sn and (In + Sn):O are 10.0:1.0 and 1.0:1.5, respectively for both of the spheres and the cubes. X-ray diffraction study showed that these particles have the same crystalline structure. Thus, it is shown that the formation of the various shapes of the ITO particles could be achieved by using different ratios of protective polymer instead of varying the protective polymer or the sintering process.  相似文献   

3.
As a linker molecule to attach gold nanoparticles (AuNPs) on indium tin oxide (ITO) surfaces, cysteamine was examined together with well-known 3-mercaptopropyltrimethoxysilane (MPTMS) and 3-aminopropyltrimethoxysilane (APTMS). Systematic comparisons of AuNPs’ nanostructures formed on ITO were carried out after the room temperature treatment in an ethanol solution of linker molecules followed by the attachment of AuNPs using (i) one-step immersion into the 20-nm Au colloidal solution or (ii) two-step immersion, i.e., a seed-mediated growth treatment. Consequently, in case (i), it was found that APTMS was most effective for denser and homogeneous attachment of AuNPs on ITO surfaces with keeping the dispersion. With the MPTMS or cysteamine linkers in case (i), AuNPs aggregated on the ITO surfaces, and the attached amount of AuNPs were larger with the MPTMS linker. In contrast, in case (ii), nanostructural growth of AuNPs was possible with MPTMS or cysteamine using the seed-mediated growth, while the growth of AuNPs was significantly suppressed with the APTMS linker. Because quite different results were obtained between APTMS and cysteamine, it was found that the attachment and nanostructural growth of AuNPs on the organic linker layers cannot be simply governed by the functional groups, -NH2, on the outer surfaces.  相似文献   

4.
粒径均匀的氧化铟粉末的研制   总被引:4,自引:0,他引:4  
以金属铟,硫酸,氨水为原料,通过工艺条件的选择,制备出过滤性良好的氢氧化铟沉淀物。该沉淀物经过干燥,煅烧不需将氧化物粉碎就可以得到粉末状氧化铟。最佳工艺条件为:反应液中铟离子初始浓度调节在70g/L以下,碱添加量为铟含量的3-4倍;沉淀反应温度控制在90℃以上。  相似文献   

5.
Visible-light enabling titanium oxide/tin indium oxide (TiO2/ITO) thin films deposited on unheated glass slides with prolonged deposition duration were investigated in this study. Structural properties characterized by X-ray diffraction (XRD), Raman spectra and scanning electron microscopy (SEM) showed typical polycrystalline structure with primary anatase phase along with elongated pyramid-like grains lying on the film surface and densely packed columnar structure from cross-sectional profile. The XRD preferential peak of (2 1 1) and the Raman peak intensity at 640 cm−1 dramatically increased without noticeable broadening and shift as the deposition time was prolonged beyond 2 h. This implies that more perfectly crystalline structure, less internal stress, and comparatively larger grains were obtained by this technique. The Ti2p3/2 and O1s XPS peaks shifted toward higher binding energy suggest that the local chemical state was influenced by the prolonged deposition duration in the film, which resulted in red shift of absorption threshold into visible-light region. Under ultra-violet (UV) and visible-light illumination, the visible-light enabling film exhibited the best photocatalytic activity on MB degradation with the rate-constant of about 0.231 h−1. Hydrophilic conversion rate was estimated to be 8.14 × 10−3 deg−1 min−1 and long-term UV-induced hydrophilicity of 10° in the dark storage up to 72 h was observed. In addition to its inherent characteristics of the layered TiO2/ITO structure on hole/electron separation, all these could be attributed to more perfectly formed crystalline structure, densely packed columnar crystals and the surface roughness along with its enlarged surface area.  相似文献   

6.
介绍了六种氧化铟的制备方法,其中以铟的气相沉积法和直流磁控溅射法制备氧化铟具有较大的优势,这两种方法工艺和技术也比较成熟。此外还介绍了制备条件对氧化铟的微观结构和性质的影响,以及根据对制备参数分析确定最佳制备条件,制备条件在氧化铟的制备过程中起着非常关键的作用。  相似文献   

7.
Polypyrrole/indium tin oxide nanocomposites were synthesized via in situ miniemulsion polymerization of pyrrole monomer in the presence of indium tin oxide nanoparticles. Different nanocomposites were synthesized by different loadings of nano indium tin oxide. The morphology and nanoparticles distribution of the nanocomposites were characterized by electron microscopy. The results of XRD and TEM analysis showed that indium tin oxide nanoparticles were well placed in the polymeric structure of latex. FTIR analysis was used for the characterization of synthesized polypyrrole and its nanocomposites. TGA analysis was performed to investigate the thermal behavior of pristine polypyrrole and its nanocomposites. Conductivities of nanocomposites were measured by 4-point probe method and compared to the neat polymer.  相似文献   

8.
氧化铟纳米粉制备及表征研究   总被引:2,自引:0,他引:2  
以无机盐为原料,采用液相沉淀法制备纳米氧化铟粉体。研究了沉淀反应条件及沉淀后处理等对纳米氧化铟粉体质量的影响,利用TG-DSC、FT-IR、XRD、SEM和EDS等分析手段对所制纳米氧化铟粉体的结构、粒度、形貌、成分等进行了表征。结果表明:该法制备的氧化铟纳米粉具有立方晶系结构、纯度较高、颗粒均匀呈球形、分散性良好、平均粒径为50nm左右。  相似文献   

9.
Layer-by-layer assembly was used to alternately deposit tungstate anions with cationic poly(4-vinylpyridine-co-styrene) to generate electrochromic thin films that transit from transparent to dark blue in their oxidized and reduced states, respectively. Tungstate is a good electrochromic material because it is completely colorless in its deposited state, while most other electrochromic materials exhibit some type of color in the absence of an applied voltage. Despite its advantages, tungstates are plagued by long switching time (>30 s), which is common amongst ceramic electrochromics, due to lack of electrical conductivity in at least one of the two states. In an effort to decrease switching time, indium tin oxide (ITO) nanoparticles were incorporated into these tungstate-based assemblies. In the absence of ITO, these films take 30-60 s to completely switch and exhibit reduced contrast with each switch. ITO-containing films, with ITO in every other bilayer, fully switch in 14 s and do not exhibit the same drift in transmittance with repeated switching. ITO allows these films to maintain electrical conductivity in both states, which is the source of this faster, more stable switching. With further optimization, this combination of fast switching and high contrast makes these films promising for use in smart windows and flexible displays.  相似文献   

10.
液相共沉淀法制备氧化铟锡超细粉体材料的研究进展   总被引:1,自引:0,他引:1  
徐伟玲  李延升 《应用化工》2005,34(7):404-407
介绍了液相共沉淀法制备氧化锢超细锡粉体材料的工艺,分析了沉淀剂、反应物的浓度、煅烧的温度和时间、分散剂等四个因素对制备过程及产物的影响。按照三氧化铟和二氧化锡的质量比为9∶1选用铟盐和锡盐;用氨水、尿素或碳酸铵作沉淀剂,并且沉淀剂不同,反应时应控制的pH值和反应时间也不同;反应物In~(3+)的浓度0.2mol/L时可得到接近纳米级的超细氧化铟锡粉体材料;700~800℃煅烧3~5h,可使前驱物成为球状,其团聚现象也可以得到综合平衡;分散剂为硫酸铵、硅烷偶联剂KH570等,对其分散机理作了简要的分析。  相似文献   

11.
The effect of surface modification of indium tin oxide (ITO) electrode on its potential response to tryptophan was investigated for ITO substrates with different surface roughness. It was found that a small difference in surface roughness, between ∼1 and ∼2 nm of Ra evaluated by atomic force microscopy, affects the rest potential of ITO electrode in the electrolyte. A slight difference in In:Sn ratio at the near surface of the ITO substrates, measured by angle-resolved X-ray photoelectron spectrometry and Auger electron spectroscopy is remarkable, and considered to relate with surface roughness. Interestingly, successive modification of the ITO surface with aminopropylsilane and disuccinimidyl suberate, of which essentiality to the potential response to indole compounds we previously reported, improved the stability of the rest potential and enabled the electrodes to respond to tryptophan in case of specimens with Ra values ranging between ∼2 and ∼3 nm but not for those with Ra of ∼1 nm. It was suggested that there are optimum values of effective work function of ITO for specific potential response to tryptophan, which can be obtained by the successive modification of ITO surface.  相似文献   

12.
A microstructure deformation of indium oxide (In2O3) nanoparticles by an in situ thermal radiation treatment in nitrous oxide plasma was investigated. The In2O3 nanoparticles were completely transformed into nanostructured In2O3 films upon 10 min of treatment time. The treated In2O3 nanoparticle sample showed improvement in crystallinity while maintaining a large surface area of nanostructure morphology. The direct transition optical absorption at higher photon energy and the electrical conductivity of the In2O3 nanoparticles were significantly enhanced by the treatment.  相似文献   

13.
In-Sn-O nanostructures with rectangular cross-sectional rod-like, sword-like, and bowling pin-like morphologies were successfully synthesized through self-catalytic growth. Mixed metallic In and Sn powders were used as source materials, and no catalyst layer was pre-coated on the substrates. The distance between the substrate and the source materials affected the size of the Sn-rich alloy particles during crystal growth in a quartz tube. This caused In-Sn-O nanostructures with various morphologies to form. An X-ray photoelectron spectroscope and a transmittance electron microscope with an energy-dispersive X-ray spectrometer were used to investigate the elemental binding states and compositions of the as-synthesized nanostructures. The Sn doping and oxygen vacancies in the In2O3 crystals corresponded to the blue-green and yellow-orange emission bands of the nanostructures, respectively.  相似文献   

14.
文章采用水热法制备ITO纳米粉末,制备的粒子为片状,体心立方晶体,商径约为50nm。将ITO粉末按比例加入到四氟乙烯基氟碳树脂中,加入添加剂,调制透明涂料配方。采用旋涂的方法将涂料涂于透明玻璃表面,耐腐蚀性研究表明,该涂料腐蚀前后透光率没有明显变化,这说明具有良好的耐酸碱腐蚀性、耐盐雾腐蚀性。  相似文献   

15.
以纯金属铟和五水氯化锡为原料,采用化学沉淀法制备氧化铟锡,用聚乙烯吡咯烷酮对铟锡氧化物进行表面修饰。用XPS、XRD、IR和TEM等对表面修饰的ITO纳米粉体进行结构和性能表征,并进行了分散性试验和电学性质的测试,结果表明:所制的ITO纳米粉体呈近似球形,平均粒径为20nm左右,无明显团聚,且结晶性良好;PVP成功链接到ITO纳米粉体表面,达到了表面修饰的作用,在分散溶剂中能稳定存在且不影响其导电性能。  相似文献   

16.
Zinc oxide was electrodeposited from oxygenated aqueous solutions of zinc chloride at 80 C on tin oxide covered glass substrates. A new activation treatment for the substrate is established. This consists in the initial formation, in the deposition solution, of a thin metallic zinc layer (5–50 nm) converted to ZnO by in situ reoxidation. Variable densities of nucleation centers (with values approaching 1010 cm–2) are formed by this treatment. This allows control of the formation of a zinc oxide layer ranging from open deposits of isolated crystallites to compact and homogeneous layers. Compact layers have high specular transmission below the band gap value (3.5 eV), whereas open films exhibit extensive light scattering. The shapes of the current–time curves during deposition are discussed in terms of nucleation and structural effects. A possible influence of the semiconducting properties of the films is pointed out.  相似文献   

17.
彭迎慧  徐旺生 《无机盐工业》2008,40(3):30-31,34
以五水氯化锡和三氯化锑为原料,柠檬酸为配合剂,尿素为均相沉淀剂,采用配合-均相沉淀法制备纳米掺锑氧化锡粉体(ATO).采用差热分析、红外分析、X射线衍射、透射电镜测试、比表面积测定对制得的粉体进行表征.结果表明,合成的纳米ATO具有四方金红石结构,粉体结晶完整.通过XRD计算得粉体的平均粒径为9.8 nm;透射电镜测定结果表明粉体的分散性较好,粒径大约为12 nm;比表面积测定粉体的比表面积达到65.2 m2/g.采用配合与均相沉淀法相结合的方法可以制备出粒径小、比表面积大和分散性好的纳米掺锑氧化锡粉体.  相似文献   

18.
采用简单化学沉淀法,以十六烷基三甲基溴化铵(CTAB)为模板,Co(NO3)2.6H2O和NaOH为原料,空气作为温和氧化剂,室温下合成了具有花状分级多孔结构的Co3O4纳米颗粒电极材料。X-射线衍射(XRD)表明,产物中主要成分为Co3O4;扫面电镜的结果显示,制备的材料具有菜花状分级多孔结构;电化学测试结果表明,最高比容量达250 F/g,且经过1 000次循环后,容量保持了84%,显示出良好的超级电容性能。  相似文献   

19.
Indium tin oxide (ITO) thin films were prepared by a sol-gel spin coating method, fired, and then annealed in the temperature range of 450-600°. The XRD patterns of the thin films indicated the main peak of the (2 2 2) plane and showed a higher degree of crystallinity with an increase in the annealing temperature. Upon annealing the films at 500 and 600°, two binding energy levels of Sn4+ ion of 486.9 eV and 486.6 eV, respectively, were measured in the XPS spectra. The ITO film that was annealed at 600° contained two oxidation states of Sn, Sn2+ and Sn4+, and it had a higher sheet resistance based on a rather low doping concentration of Sn4+. The film that was annealed at 500° and subsequently treated with 0.1 N HCl solution for 40 s showed a sheet resistance of 225 Ω/square. The surface treatment by the acidic solution diminished the RMS (root mean square) roughness value and the residual carbon content (XPS peak intensity of carbon) of the ITO films. It seems that the acid-cleaning of the ITO thin films led to a decrease of the surface roughness and sheet resistance.  相似文献   

20.
以InCl3·4H2O及SnCl4·5H2O为原料,用共沉淀法制备超细In2O3SnO2复合催化剂,用XRD、TEM、TPD等对所制备的样品催化剂进行表征.XRD、TEM测定结果表明,所制备的样品粒径20~30 nm,分布窄,用TPD测定了样品对O2及CH4的脱附情况.CH4的催化燃烧试验表明,所制备的In2O3-SnO2复合催化剂具有良好的催化反应活性.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号