排序方式: 共有9条查询结果,搜索用时 15 毫秒
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计算了不同Al掺杂浓度下ZnO体系电子结构和光学属性.分析了掺杂对AZO(ZnO:A1)晶体结构、能带、态密度、光学性质的影响.所有计算都是基于密度泛函理论框架下的第一原理平面波赝势方法.计算结果表明:Al掺杂ZnO在导带底引入了大量由掺杂原子贡献的导电载流子,明显提高了体系的电导率.费米能级进入导带.同时,光学性质的计算表明光学带隙明显展宽,且向低能方向漂移;AZO透明导电材料的光学透过率在可见光范围内高达85%,紫外吸收限随着掺杂浓度的增加而发生蓝移.所有计算表明AzO材料可作为优良的透明导电薄膜材料. 相似文献
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Jia Wang Li Hua Zhu Jing Li He Qing Tang 《中国化学快报》2007,18(8):1005-1008
Well-confined uniform polyaniline (PANI) nanofibers were synthesized by using photo-assisted chemical oxidative polymer- ization of aniline in the presence of different dopant acids,and the radical scavenging ability of the produced PANI nanofibers was determined by the DPPH assay.It was found that the antioxidant activity of PANI nanofibers was higher than conventional PANI, and increased with decreasing of averaged diameter of the nanofibers.The enhanced antioxidant activity was concerned with increased surface area of PANI nanofibers. 相似文献
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Promotional Effect of Bismuth as Dopant in Bi-Doped Vanadyl Pyrophosphate Catalysts for Selective Oxidation of n-Butane to Maleic Anhydride 总被引:2,自引:0,他引:2 下载免费PDF全文
Y. H. Taufiq-Yap Y. Kamiya K. P. Tan 《天然气化学杂志》2006,15(4):297-302
Bismuth-promoted (1% and 3%) vanadyl pyrophosphate catalysts were prepared by refluxing Bi(NO3)3·5H2O and VOPO4·2H2O in isobutanol. The incorporation of Bi into the catalysts lattice increased the surface area and lowered the overall V oxidation state. Profiles of temperature programmed reduction (TPR) in H2 show a significant shift of the maxima of major reduction peaks to lower temperatures for the Bi-promoted catalysts. A new peak was also observed at the low temperature region for the catalyst with 3% of Bi dopant. The addition of Bi also increased the total amount of oxygen removed from the catalysts. The reduction pattern and reactivity information provide fundamental insight into the catalytic properties of the catalysts. Bi-promoted catalysts were found to be highly active (71% and 81% conversion for 1% and 3% Bi promoted catalysts, respectively, at 703 K), as compared to the unpromoted material (47% conversion). The higher activity of the Bi-promoted catalysts is due to that these catalysts possess highly active and labile lattice oxygen. The better catalytic performance can also be attributed to the larger surface area. 相似文献
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Significant improvement of OLED efficiency and stability by doping both HTL and ETL with different dopant in heterojunction of polymer/small-molecules 下载免费PDF全文
This paper reports that the polymer/organic heterojunction doped
light-emitting diodes using a novel poly-TPD as hole transport
material and doping both hole transport layer and emitter layer with
the highly fluorescent rubrene and DCJTB has been successfully
fabricated. The basic structure of the heterostructure is
PTPD/Alq3. When hole transport layer and electron transport layer
are doped simultaneously with different dopant, the
electroluminescence quantum efficiencies are about 3 times greater
than that of the undoped device. Compared with undoped device and
conventional TPD/Alq3 diode, the stability of the doping device is
significantly improved. The process of emission for doped device may
include carrier trapping as well as F\"{o}rster energy transfer. 相似文献
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搀杂六铝酸盐LaMxAl12-xO19+δ上甲烷催化燃烧研究 总被引:4,自引:1,他引:4
采用共沉淀法制备了系列金属Mn搀杂的六铝酸盐LaMnxAl12-xO19+δ(x分别为0, 0.5, 1.0, 1.5, 2.0, 5.0)催化剂, 采用BET, TG-DTA, XRD进行了物性表征, 并以甲烷催化燃烧为目标反应, 研究了Mn搀杂量对催化剂活性的影响. 结果表明 LaAl12O19+δ催化活性较低, 随着Mn的引入, 催化活性逐步提高. 当x=1.5时, 催化活性达到最大值, 为理想搀杂量. 焙烧温度对晶型及催化活性有重要影响, 1200 ℃时可以形成完整的六铝酸盐晶型, 并具较高的催化性能. 所得较好催化剂起燃温度T10%为418 ℃, T90%为663 ℃. 相似文献
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P.A. Tanner 《光散射学报》2005,17(3):309-311
pacc:7850E Thegeneralcharacteristicsoff-fandf-d emissionspectraoflanthanideionsininsulators arediscussed.Thecurrentstatusofenergylevel andintensitycalculationsisevaluated.Taking typicalexamples,themethodsofsynthesisoflan thanideion-dopedinsulatingnanomate… 相似文献
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Effect of Different Dopant in the Mo-V-Te-O Catalyst on the Performance of Selective Oxidation Propane to Acrolein 总被引:1,自引:0,他引:1
HuaChangJIANG WeiMinLU HuiLinWAN 《中国化学快报》2004,15(8):977-980
Several Mo-V-Te-O mixed metal oxides catalysts with different dopant were prepared and used for catalytic oxidation propane to acrolein. It was revealed that the addition of P could greatly improve the performance of the Mo-V-Te-O catalyst. The catalysts were examined by XRD and H2-TPR. The XRD characteristic of the Mo-V-Te-P-O showed that the addition of P could aggrandize the (V0.07Mo0.93)5O14 phase. H2-TPR illuminated that the MoV0.3Te0.23P0.15On catalyst took on the best redox ability. 相似文献
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KaiRAO XiangKaiFU XiaoPingRAO 《中国化学快报》2004,15(8):957-960
The TiO2, MoO3, PEO doped four-member tungstic acid sols were prepared for the first time. The stability of different doped content sols were investigated and optimized with rotational viscometer. The four-member doped tungstic acid sol was very stable which could be stored more than two months at room temperature. The WO3 electrochromic film prepared from this doped four-member tungstic acid sol had excellent performance and longevity of service. 相似文献
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