共查询到20条相似文献,搜索用时 187 毫秒
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采用溶剂热法,对制备的前驱体进行热处理,最后得到了片状结构的ZnSe纳米材料.然后利用X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电子显微镜(HRTEM))和光致发光谱(PL)等测试手段对样品的晶体结构、形貌、微结构和光学性质等进行了表征分析.结果表明制备的ZnSe块状结构是由厚度大约在200 ~300 nm纳米带堆叠而成,其晶体结构为密排六方晶体结构.此外,通过分析反应过程,对片状ZnSe生成过程中的可能的化学反应和片状ZnSe可能的形成机理做了简单的分析. 相似文献
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以Zn(NO2)2·6H2O和纳米SiO2为原料,采用水热法,通过控制反应体系pH值制备了Zn2SiO4纳米颗粒、纳米棒及海胆形微米球.采用X射线衍射(XRD)及场发射扫描电子显微镜(FE-SEM)对样品的物相组成和微观形貌进行了表征.并采用紫外-可见漫反射测试(UV-vis DRS)测定了样品的光吸收性能,DRS结果显示Zn2SiO4纳米材料的光吸收主要集中在紫外光区,与Zn2SiO4纳米棒和纳米颗粒相比,海胆形Zn2SiO4微米球的吸收峰更宽,表明其对光的利用范围要大于纳米棒和纳米颗粒. 相似文献
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以钛酸丁酯为钛源,在高能超声的辅助作用下,通过溶胶-凝胶法合成了纳米TiO2光催化剂,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和紫外-可见光光度计(UV-Vis)等对光催剂进行检测与表征.结果表明:高能超声的空化作用细化了纳米TiO2的显微结构,形成了分散有序的介孔结构.当超声频率为45 kHz时,纳米TiO2的晶粒尺寸约为12 nm,介孔孔道尺寸为10 nm,对有机污染物的有效降解率为92;. 相似文献
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采用水热法成功合成了二级结构的Co3O4纳米材料。借助X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对产物进行表征,研究了溶液的pH值、表面活性剂聚乙二醇PEG的用量等反应条件对产物形貌的影响。结果表明,当Co(NO3)2·6H2O为1.8mol/L,pH值为8、PEG用量为10g时,可以获得完美二级结构--柿饼状的Co3O4纳米材料,其光学带隙为1.49eV,该结构的Co3O4纳米材料对亚甲基蓝的光催化性能优异。 相似文献
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利用热蒸发法在N型硅片表面成功制备出大面积SiO2纳米线和SiO2纳米棒结构.采用X射线粉末衍射(XRD),扫描电子显微镜(SEM),X射线能量色散谱(EDX),拉曼光谱(RS)和光致发光(PL)对合成的产物进行了表征.结果表明,用此方法生长的SiO2纳米材料,其结构和形貌与生长参数关系密切,随着沉积温度降低纳米线长度变短,最后呈现出棒状结构.此外,还研究了SiO2纳米结构独特的光学性质.该研究对改善光电子半导体器件的性能应用具有重要意义. 相似文献
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在制备的Ag纳米线的基础上,用水热法合成了Ag/ZnS核壳结构纳米棒.使用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、X射线能谱仪(EDS)、高分辨透射电子显微镜(HRTEM)、紫外-可见双光束分光光度计(UV-vis)、光致发光扫描仪(PL)等检测设备对样品的成分、形貌、微结构及光学性能进行了表征.结果显示,制备的Ag/ZnS复合材料为ZnS纳米颗粒包覆Ag纳米线的核壳结构,其紫外吸收峰位于350 nm处,相对于ZnS纳米颗粒变宽并发生红移,PL发射峰位于462 nm处,相对于ZnS纳米颗粒发生了蓝移,强度明显降低.光催化结果显示,Ag/ZnS核壳结构纳米棒的光催化性能优于ZnS纳米颗粒,分析了光催化反应机理. 相似文献
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J. P. Mendes J. M. S. S. Esperança M. J. Medeiros A. Pawlicka 《Molecular Crystals and Liquid Crystals》2017,643(1):266-273
New polymer electrolytes (PEs), potentially interesting for solid-state electrochemical devices applications, were synthesized by a solvent casting method using pectin and ionic liquid (IL) N,N,N-trimethyl-N-(2-hydroxyethyl)ammonium bis(trifluoromethylsulfonyl)imide ([N1 1 1 2(OH)] [NTf2]. The resulting electrolytes besides being moderately homogenous and thermally stable below 155°C, they also exhibited good mechanical properties. The SPE membranes were analyzed by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and complex impedance spectroscopy. 相似文献
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Bin Ai Hui Shen Qun Ban Xiaojing Wang Zongcun Liang Xianbo Liao 《Journal of Crystal Growth》2004,270(3-4):446-454
Silicon sheets from powder (SSP) ribbons have been prepared by modified SSP technique using electronic-grade (9N purity) silicon powder. The surface morphology, crystallographic quality, composition and electric properties of the SSP ribbons were investigated by surface profiler, X-ray diffraction (XRD), scanning electron microscopy (SEM), metallurgical microscope, Auger electron spectroscopy (AES) and four-point probe apparatus, respectively. The results show that the SSP ribbon made from electronic-grade silicon powder is a suitable candidate for the substrates of crystalline silicon thin film (CSiTF) solar cells, which could meet the primary requirements of CSiTF solar cell process on the substrates, including surface smoothness, crystallographic quality, purity and electric conductivity, etc. 相似文献
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Zhenyuan Ji Jiquan Sun Xiaoping Shen Guoxing Zhu 《Crystal Research and Technology》2013,48(11):1022-1026
A simple and general microwave route is developed to synthesize nanostructured ZnO using Zn(acac)2·H2O (acac = acetylacetonate) as a single source precursor. The reaction time has a great influence on the morphology of the ZnO nanostructures and an interesting spindle‐like nanostructure is obtained. The microstructure and morphology of the synthesized materials are investigated by X‐ray diffraction (XRD), scanning electron microscopy (SEM), field‐emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high‐resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). It is found that all of them with hexagonal wurtzite phase are of single crystalline structure in nature. Ultraviolet–visible (UV‐vis) absorption spectra of these ZnO nanostructures are investigated and a possible formation mechanism for the spindle‐like ZnO nanostructures is also proposed. 相似文献
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Tong‐Ming Shang Jian‐Hua Sun Quan‐Fa Zhou Ming‐Yun Guan 《Crystal Research and Technology》2007,42(10):1002-1006
Nanoplates, flower‐like nanostructure of ZnO were successfully synthesized by employing ZnSO4·7H2O, NaOH as the starting materials at 120°C under hydrothermal condition. Keeping the same parameters, ZnO urchin shape was obtained by addition of vitamin C at 190°C. Characterizations were carried out by X‐ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) at room temperature. Selected area electron diffraction (SAED) pattern confirms that the product is single crystalline nature. The possible formation mechanisms for synthesized ZnO nanosturcture with various morphologies have also been proposed. PL spectrum from the ZnO flower‐like structures reveals weak UV emission and strong green emission. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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在Ni催化剂的存在下,通过SiCl4的水解氨解反应并在1300℃氨气气氛中进行热氮化处理制得了无定形氮氧化硅纳米线.产物经X射线衍射(XRD)、热重-差示扫描量热(TG-DSC)、扫描电镜(SEM)、透射电镜(TEM)、能量色散谱(EDS)和选区电子衍射(SAED)等表征手段进行分析,结果表明纳米线为无定形结构,直径为100~150nm.在波长为220nm的光激发下,产物的光致发光光谱(PL)在563nm和289nm处分别出现了一个强的绿光发光峰和一个弱的紫光发光峰.对纳米线的生长机理进行分析,表明纳米线的生长遵循气-液-固(VLS)机制控制模式. 相似文献
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Xifeng Lu Qinqin Yu Kang Wang Luchuan Shi Xing Liu Aiguo Qiu Lei Wang Deliang Cui 《Crystal Research and Technology》2010,45(5):557-561
Flowerlike structured In2O3 were successfully synthesized via a hydrothermal process and the subsequent calcinations. The obtained sample consists of microrods with an average diameter of 0.5‐1 μm and a length of 1‐3 μm. Structure and property of the sample were characterized by X‐ray powder diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The sensing properties towards trimethylamine (TMA) were examined at 200‐400 °C, which showed high sensitivity, better selectivity, and prompt response/recovery merits. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Uniform capsule‐like α‐Fe2O3 particles were synthesized via a simple hydrothermal method, employing FeCl3 and CH3COONa as the precursors and sodium dodecyl sulfate (SDS) as soft template. X‐ray powder diffraction (XRD), field emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM), and high‐resolution transmission electron microscopy were used to characterize the structure of synthesized products. Some factors influencing the formation of capsule‐like α‐Fe2O3 particles were systematically investigated, including different kinds of surfactants, the concentration of SDS, and reaction times. The investigation on the evolution formation reveals that SDS was critical to control the morphology of final products, and a possible five‐step growth mechanism was presented by tracking the structures of the products at different reaction stages. 相似文献
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以Zn粉为原料,在CuE(E=S, Se)微米球的辅助下,采用化学气相沉积(CVD)法在Si衬底上成功制备出微米级ZnE(E=S, Se)网状晶须.用XRD,EDS,SEM和PL谱分别对产物的结构、成分、形貌和结晶质量进行了测试和分析.结果表明:生长的ZnS和ZnSe微米晶须均为立方闪锌矿结构,长度达300 μm以上,具有接近理想化学计量比的成分和较高的结晶质量.ZnE微米晶须的生长符合氧化还原反应下的气-液-固生长机制,Cu3Zn合金充当了实际的微米晶须生长催化剂,在晶须生长过程中Cu3Zn合金汇聚在一起使ZnE微米晶须形成交叉网状结构. 相似文献