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微波合成氧化锌纳米棒聚集体 总被引:1,自引:1,他引:0
以草酸锌和碳酸钠的水溶液为前驱体溶液,微波低火辐射10 min,成功制备出结晶性好的氧化锌纳米棒聚集体(1),其结构和形貌经X-射线衍射、选区成份分析和场发射扫描电子显微镜表征.结果表明,1结晶性好,平均直径60 nm,长度在300 nm~400 nm,沿着c轴择优取向生长.对生长过程进行了分析. 相似文献
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以分析纯ZnO作为锌源、NaOH为矿化剂、盐酸为反应溶液pH调节剂,利用水热反应制备了花状ZnO纳米棒;采用扫描电子显微镜和X射线衍射仪分析了产物的形貌和结构,考察了水热温度以及Zn2+和OH-浓度比对产物形貌的影响;以甲基橙为目标降解物,采用紫外-可见分光光度计研究了ZnO纳米棒的光催化性能.结果表明,在水热反应温度80℃、Zn2+/OH-浓度比1∶7.5条件下所得ZnO纳米棒呈花状聚合,直径约为200nm,长度约为2μm,具有六方纤锌矿结构.当甲基橙初始浓度为30 mg.L-1、ZnO纳米棒的投放量为1.5g.L-1时,以300W紫外灯照射150min,甲基橙的降解率可达90%. 相似文献
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Using Zn(acac)2 as precursor, ethylenediamine as base, distilled water as solvent, multigonal(octagonal and above) star-shaped ZnO microcrystals with high purity and even particle size have been prepared in domestic microwave oven by low heating for 8 min. The obtained powder was characterized by XRD, FESEM and TEM. The individual star-shaped ZnO microcrystal was composed of some hexagonal nanocones with diameters of 100~500 nm and lengths of 0.6~1 μm growing along c axis. The room temperature PL spectrum showed a strong broad yellow emission with peak located at 564 nm. The deep-level involved in the yellow luminescence is attributed to interstitial oxygen. 相似文献
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近年来.一维纳米结构如纳米线、纳米棒、纳米带等.由于其新颖的物理化学性质及其在光学或电学器件上的广泛应用前景.已成为研究开发的热点。特别是氧化锌(ZnO)这种宽禁带(3.37eV)、高激子束缚能(60meV)的功能性半导体材料。基于它在光电子器件、太阳能电池、传感器、二极管、场发射显示器等领域潜在的重要应用价值,各国科学工作者都给予极大的研究热情.开发出了许多合成方案制备一维纳米ZnO结构,如水热法,模板法同,微乳液法阐,CVD法,热蒸发法,MOVPE法,电化学沉积法等。 相似文献
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微波固相合成氧化锌纳米棒 总被引:4,自引:0,他引:4
通过前驱体的微波固相热分解法快速合成了氧化锌纳米棒, 其直径在60~385 nm之间, 长可达数微米. 前驱体则通过一步室温固相反应制备. 用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能量色散X射线分析(EDX)和透射电子显微镜(TEM)对产物的结构和形貌进行了表征. 同时, 对氧化锌纳米棒的光致发光(PL)性能作了测试, 结果表明在355 nm处有一个明显的近带隙发射峰. 另外, 对比实验表明, 微波辐射在氧化锌纳米棒的形成过程中起了关键性作用, 并对其形成机理进行了初步探讨. 相似文献
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化学溶液沉积法制备单分散氧化锌纳米棒阵列 总被引:6,自引:1,他引:6
在由溶胶凝胶法制备的纳米ZnO薄膜基底上, 采用化学溶液沉积法制备了单分散、高度取向的ZnO纳米棒阵列膜. 通过控制纳米ZnO薄膜的制备工艺, 可以调节氧化锌纳米棒的直径. 利用FESEM, TEM, HRTEM, SAED和XRD表征了氧化锌纳米棒阵列的形貌和晶体结构. ZnO纳米棒的室温PL谱具有很高的紫外带边发射峰, 在可见光波段无发射峰, 表明该方法制备的ZnO纳米棒晶体结构完整, 晶体中O空位的浓度很低. 相似文献
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以自制的 ZnO 纳米棒为模板合成了 MnO2 纳米棒.x-射线衍射、红外光谱和透射电镜等对产物成分、晶型结构及其形貌的分析结果表明,所得样品均为平均直径20nm左右、平均长度约180nm的α-MnO2 纳米棒.循环伏安和恒流充放电测试分析所得样品超级电容特性的结果表明,在 1mol/L Na2SO4 水溶液中,2mA... 相似文献
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In recent years, considerable efforts have been devoted to the development of systems in which C60 is covalently linked to an electron donor.[1] Studies[2] on intermolecular photoinduced electron transfer between C60 and triphenyl amine show that triphenyl amine is a good donor. It is envisaged that the use of donor segments consisting of either pyrrole/aniline may extend the lifetime of charge-separated state.[3] Since Gedye[4] demonstrated that many organic reactions can be conducted rapidly under microwave irradiation, here we have successfully synthesized five new fulleropyrrolidines containing triphenyl amine or thiophene dyads under microwave irradiation, which are different from traditional heating. The determination of structures of these fulleropyrrolidines is in progress. On the other hand, we have studied the geometry, electronic structures and frontier orbitals of these N-methyl-pyrrolo[3,4]C60 derivatives by using AM1semiempirical quantum calculation method. The results indicate that there exists strong intramolecular electron transfer in them. 相似文献
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Summary. Salicylanilides were prepared in 70–95% yields in 4–8min from phenyl salicylate or phenyl 4-methoxysalicylate and substituted anilines under microwave irradiation under solvent free conditions.Received October 17, 2002; accepted October 22, 2002
Published online July 3, 2003 相似文献
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Eva Veverková Mária Meciarová ?tefan Toma Jozef Balko 《Monatshefte für Chemie / Chemical Monthly》2003,14(6):1215-1219
Salicylanilides were prepared in 70–95% yields in 4–8min from phenyl salicylate or phenyl 4-methoxysalicylate and substituted anilines under microwave irradiation under solvent free conditions. 相似文献