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以导电玻璃为基底采用水热法制备了WO3纳米片薄膜,再通过溶剂热法改变不同溶剂热反应时间(6、8和10 h)在WO3纳米片薄膜上生长Bi2WO6制备了WO3/Bi2WO6复合薄膜.利用XRD、SEM、UV-Vis、光电流、光电催化和交流阻抗对WO3/Bi2WO6复合薄膜的结构和光电性能进行表征与测定.结果表明,WO3纳米片薄膜的光电流密度为0.74 mA/cm2,对质量浓度为6.0 mg/L亚甲基蓝的光电催化效率为47.9%.不同WO3/Bi2WO6复合薄膜的光电化学性能均优于单一WO3纳米薄膜,且溶剂热反应时间为8 h的WO3/Bi2WO6复合薄膜具有最高的光电流密度(1.22 mA/cm2)和最优的光电催化效率(58.6%).WO3/Bi2WO6复合薄膜有效降低了复合薄膜内部电子阻抗,增加了有效光电化学反应位点,显著提升了光电化学性能. 相似文献
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室温下,采用脉冲直流反应磁控溅射方法在玻璃衬底上制备了掺铝的氧化锌(ZnO:Al,AZO)透明导电薄膜。采用配有λ-sensor氧分压传感器的控制器闭环控制氧分压,研究了氧分压对薄膜结构、表面形貌和光电性能的影响。结果表明:在不同的氧分压下制备的AZO薄膜均为多晶纤锌矿结构,具有[002]择优取向,其晶体呈柱状生长,晶粒之间结合紧密。氧分压为3.36×10–2Pa时,AZO薄膜的性能指数最高,其电阻率为1.15×10–3·cm,相应的载流子浓度为2.1×1020/cm3,载流子迁移率为25.8cm2/(V s),可见光透射率为79.1%。随着AZO薄膜的载流子浓度由1.03×1020cm–3增加到3.64×1020cm–3,薄膜禁带宽度由3.49eV增大到3.72eV。 相似文献
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采用溶胶-凝胶旋涂法在玻璃衬底上制备了不同厚度的ZnO:Li半导体薄膜.采用X射线衍射仪和扫描电子显微镜分析了薄膜的物相结构和形貌,用Hall效应测量仪常温下测量薄膜的电学性能.结果表明:该薄膜具有高度的c轴择优取向性,所有薄膜只有1个(002)衍射峰,并且衍射强度随着膜厚增加而加强.ZnO:Li薄膜晶粒呈柱状,晶粒直径不随膜厚改变,约为40 um.ZnO:Li薄膜为P型导电,薄膜越厚,其电学性能与晶体结晶越好,(002)方向择优取向生长越明显.电阻率随着膜厚增加而减小,最小的电阻率为1.32×102(Ω·cm).载流子-空穴浓度为3.546×1016/cm3,迁移率为1.34cm2/(V·s).ZnO:Li薄膜在可见光范围内的透过率达到90%,薄膜对紫外光的吸收与厚度有关. 相似文献
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采用射频磁控溅射法在普通玻璃衬底上制备了Ga2O3含量为3wt.%的掺镓氧化锌透明导电薄膜(GZO).通过X射线衍射仪(XRD)、场发射扫描电子显微镜(SEM)、四探针测试仪、台阶仪、UV-Vis-NIR3600型紫外-可见分光光度计研究了溅射时间对薄膜结构、表面形貌及光电性能的影响.结果表明,溅射时间为40 min时制备的GZO薄膜的光电综合性能最好,可见光区透过率峰值86%,方阻为16.4Ω/□,电阻率为1.18 ×10-3Ω·cm,性能指数ΦTc为4.73 ×10-3 Ω-1;随着溅射时间增加,薄膜光学带系从3.69 eV减少到3.56 eV.在溅射时间60 min时结晶度最高,方块电阻为9.0Ω/□,电阻率最低为9.7×10-4 Ω·cm,可见光透过率峰值为81%. 相似文献
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采用气溶胶辅助化学气相沉积法(AACVD)在玻璃衬底上沉积F掺杂SnO_2(FTO)薄膜,研究了前驱液中不同F/Sn摩尔比制备的FTO薄膜的结构、表面形貌、光学、电学及光致发光性能。结果表明:所制备FTO薄膜均为(200)面择优取向的多晶四方金红石相结构;前驱液中F/Sn摩尔比的增加,会导致(110)面的衍射峰强度增加,薄膜表面堆积颗粒形状发生变化,薄膜样品光学透过率提升;当F/Sn摩尔比=40%时,FTO薄膜具有最大的载流子浓度1.031×10~(21) cm~(–3)以及最小的电阻率3.42×10~(–4)?·cm,这可归结为适量F的存在产生不同的缺陷影响。(200)面择优取向FTO薄膜光致发光谱可用于表征不同缺陷形式的跃迁。 相似文献
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M. S. J. Simmonds W. M. Blaney F. Delle Monache M. Marquina Mac-Quhae G. B. Marini Bettolo 《Journal of chemical ecology》1985,11(12):1593-1599
Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria. 相似文献
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Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed. 相似文献
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中蓝晨光化工研究院《塑料工业》编辑部 《塑料工业》2007,35(3):1-25,67
收集了2005年7月~2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、通用热固性树脂(酚醛、聚氨酯、不饱和树脂、环氧树脂)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。 相似文献
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中蓝晨光化工研究院有限公司《塑料工业》编辑部 《塑料工业》2009,37(3)
收集了2007年7月~2008年6月世界塑料工业的相关资料,介绍了2007~2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍. 相似文献
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Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many
coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ
within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting
organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled.
An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent
is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible.
UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive
substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using
UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control
over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant
UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely
block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology
of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent.
Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago,
IL. 相似文献
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Miller DR 《Journal of chemical ecology》2006,32(4):779-794
Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA. 相似文献