共查询到19条相似文献,搜索用时 78 毫秒
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在不同沉积温度(25~400°C)下,利用射频磁控溅射技术在Si(100)基底上制备了TiN薄膜。采用X射线衍射仪和原子力显微镜研究了沉积温度对膜结构和表面形貌的影响,计算了晶面间距和晶格常数,分析了薄膜的应力性质。实验结果表明,不同沉积温度下制备的TiN薄膜主要含有(111)和(220)两种取向,以(220)为择优取向;随着温度的升高,薄膜晶化质量先提高然后趋于稳定。薄膜内应力为压应力,且随温度的升高而有所增大。随沉积温度升高,薄膜晶粒尺寸变小,表面结构更加均匀致密。 相似文献
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为解决石墨表面制备的不粘涂层结合力低的问题,可采用钛薄膜作为过渡层以提高结合力。本文采用磁控溅射技术在石墨基片表面制备钛薄膜,通过优化溅射工艺参数,提高钛薄膜的附着力。通过正交试验设计研究溅射功率、溅射气压和沉积时间对钛薄膜组织结构、表面粗糙度以及附着力的影响。利用扫描电镜(SEM)等分析了钛薄膜的微观形貌、物相结构及表面粗糙度,进行划格试验评估了薄膜的附着力。研究得到优化工艺参数为:溅射功率200 W,溅射气压1.2 Pa,沉积时间50 min。薄膜微观呈现岛状结构,颗粒尺寸约150 nm。钛薄膜为密排六方α-Ti结构,沿(002)晶面择优生长,这可能与石墨基体的片层状结构有关。溅射工艺参数的优化可以有效提高钛薄膜与石墨基体的附着力。 相似文献
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利用磁控溅射技术,在不同偏压条件下在Si(001)基底上沉积了金属Cr薄膜样品。用同步辐射装置对样品进行了X-射线反射率测试,采用X-射线反射率分析法研究了不同偏压下Cr薄膜密度的变化。发现当偏压小于300 V时,偏压对所沉积的薄膜起到紧致的效果,偏压为300 V时薄膜密度最大;当偏压大于300 V时,薄膜密度减小。另外,为了探究偏压对薄膜表面形貌的影响,用扫描电子显微镜对各样品进行了表面分析,发现在偏压较小时薄膜表面较为平整;随着偏压增大,表面呈现界面分明的岛状分布。 相似文献
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金刚石薄膜的表面成分和形貌对表面能的影响 总被引:1,自引:0,他引:1
采用微波等离子体化学气相沉积法制备了(111)面和(100)面金刚石薄膜。测量了金刚石薄膜与液体的接触角、金刚石薄膜表面粗糙度和电阻率。通过扫描电镜、X射线衍射、X射线光电子能谱研究了金刚石薄膜的表面纯度和形貌等对表面能的影响。结果表明:金刚石纯度越高、表面粗糙度越大、晶粒尺寸越小,其表面能越大。经过空气等离子体后处理的金刚石薄膜的纯度和亲水性明显提高。随着在空气中放置时间的增加,亲水性逐渐减弱。在空气中放置相同时间,O2等离子体后处理的金刚石薄膜比H2等离子体后处理的金刚石薄膜亲水性好。 相似文献
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采用溶胶-凝胶法在玻璃基体表面制备了经300℃,400℃和500℃烧结热处理的ZrO2薄膜.利用X射线衍射仪、原子力显微镜和纳米压痕仪研究了烧结温度对ZrO2薄膜表面形貌和力学性能的影响.实验结果表明,随着烧结温度的增加,ZrO2的晶体结构由少量的单斜晶相逐渐转变为单斜晶相和四方晶相的混合相.薄膜表面形貌逐渐改善,薄膜的表面粗糙度和颗粒度依次减小,薄膜的表面粗糙度分别为10.5 nm、7.2 nm和5.6 nm,ZrO2的粒径分别为188 nm、153 nm和130 nm.ZrO2薄膜的弹性模量和硬度都显著提高,薄膜的弹性模量分别为89.6 GPa、114.2 GPa和128.9 GPa,薄膜的硬度分别为7.6 GPa、10.3 GPa和15.1 GPa. 相似文献
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《国际聚合物材料杂志》2012,61(2):167-176
Influence of electrochemical process parameters such as monomer and electrolyte concentrations, current density, pH of the electrolyte, and type of electrolyte have been studied during polymerization of polypyrrole (Ppy). The changes in the conductivity of synthesized Ppy film for different electrolytes were observed by chronopotentiograms recorded during the electrochemical polymerization and it was confirmed by measuring it using four probe techniques. It was found that the electrochemical process parameters have a considerable influence on the conductivity of the film. The Ppy film was synthesized on a platinum substrate by electrochemical polymerization with different electrolytes such as potassium nitrate, sodium nitrate, sulphuric acid, hydrochloric acid, potassium chloride, sodium chloride, oxalic acid, and sodium salicylate, under galvanostatic condition over a wide range of pH of the reaction medium and applied current density. The different concentration ratios of pyrrole and sodium nitrate were considered during synthesis of Ppy films. It has been observed that the polymerization potential increases with the pH and applied current density. One could synthesize Ppy film with very good surface morphology and conductivity with optimized process parameters. The characterization of synthesized Ppy film was done by electrochemical technique, electrical conductivity, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). 相似文献
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The morphology of surfaces of several ceramic materials has been examined using transmission electron microscopy. The approach used was to prepare a sample for examination in the microscope, carefully clean it, and then heat-treat it. In the case of the oxides studied (alumina and spinel) the samples were heated in air; the non-oxides (α-SiC and β -SiC) were annealed under vacuum. The morphology in all but one case was such that the surface faceted parallel to the nearest low-index plane to give well-defined terraces; these were separated by ledges which also tended to facet parallel to the traces of low-index planes. The exception was the {1100} alumina surface, which appears to be unstable in air at temperatures close to 1400°C. A computer program using a multislice approach was used to estimate the height of the steps on the (0001) surface; the step heights appear to be multiples of the c lattice parameter. A reconstruction of this surface as a result of this heat treatment is also proposed. 相似文献
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Mohammad Taghi Hosseinnejad Mahmood Ghoranneviss Mohammad Reza Hantehzadeh Elham Darabi 《Journal of Inorganic and Organometallic Polymers and Materials》2017,27(1):61-72
Al-doped ZnO (AZO), as one of the most promising transparent conducting oxide (TCO) materials, has now been widely utilized in thin film solar cells. In this research the optimization process of AZO thin films deposited by plasma focus device was carried out by investigation of its physical properties under different deposition conditions for its utilize as a front contact for the Cadmium Telluride (CdTe) based thin film solar cell applications. The effects of number of focus shots and angular position of substrate on the microstructure, surface morphology and photoluminescence properties of the thin films have been systematically studied. X-ray diffraction (XRD) study confirmed the polycrystalline nature of the all deposited AZO thin films. XRD analysis also revealed that crystal structure characteristics of obtained samples strongly depend on deposition conditions (number of shots and angular position). Scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses revealed the structure growth and enhancement of surface roughness, with increasing of focus shots or decreasing of angular position. From Photoluminescence (PL) emission spectra, the variations of structural defects and band gap energy for all the AZO thin films prepared under different deposition conditions were also discussed. 相似文献
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用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和紫外-可见分光光度计观察4%(原子分数)In掺杂ZnO薄膜的微结构、表面形貌和光学性质.微结构分析表明:薄膜仍为六角纤锌矿结构,由于In杂质的掺入,使得薄膜结晶度劣化,退火温度对薄膜微结构影响较小;表面形貌观察结果显示:薄膜表面凹凸不平,450 ℃退火处理薄膜表面最平坦,尺寸在50~100 nm之间小颗粒致密、均匀地分布于起伏的表面;紫外可见透射谱研究结果表明:随着退火温度升高,薄膜光学带宽E_g由3.267 eV减小到3.197 eV,该结果可能与薄膜表面残余应力发生变化密切相关. 相似文献
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退火处理对玻璃表面沉积的ZnO薄膜微观形貌与性能的影响 总被引:1,自引:0,他引:1
以Zn(NO3)2·6H2O为前驱体,采用超声喷雾热解法在500℃下、在钠钙硅浮法玻璃衬底上制备了ZnO薄膜.分别在不同温度(500、550、600℃)和不同时间(30、60、120min)对制备的ZnO薄膜进行了退火处理.研究退火条件对ZnO薄膜微观结构、形貌以及光学性能的影响.结果表明:退火处理能提高ZnO薄膜的c轴取向;随着退火时间的延长,ZnO薄膜附着强度随之增加,但c轴取向度呈先增强,至120min时又开始呈下降的趋势;随着退火温度的升高,ZnO薄膜的c轴取向亦出现先显著增强,之后又开始下降的趋势,同时可见光透过率亦呈相同的变化趋势.最佳退火条件为500℃温度保温60min,此时薄膜不仅c轴取向生长优势明显,结晶质量良好,表面颗粒大小均匀,致密平滑,同时薄膜的可见光透过率由退火前的70%提高到90%. 相似文献
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组织结构对Co-Ni-P薄膜形貌和磁性的影响 总被引:2,自引:0,他引:2
化学镀 Co- Ni- P薄膜镀态下为非晶态结构 ,表面较为平整 ;经 30 0℃× 1 h热处理 ,发生了晶化转变 ,表面由“圆锥峰“所构成 ;随加热温度的提高 ,镀层析出了 Co2 P相 ,并发生了由密排六方结构的α- Co向面心立方结构的β- Co的同素异构转变。非晶态 Co- Ni- P薄膜的矫顽力较低 ,矩形比较高 ;薄膜向晶态转变时 ,矫顽力和矩形比皆呈上升趋势 ;50 0℃× 1 h热处理 ,薄膜由α- Co和 Co2 P相构成时 ,且在晶界上偏聚较多磷的影响下 ,矫顽力和矩形比的值达到最高 ;温度继续升高 ,晶粒长大 ,第二相粗化时 ,薄膜的矫顽力和矩形比都减小。化学镀 Co- Ni- P薄膜具有优秀的高密度垂直记录特性。 相似文献
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To better understand the role of the substrate in the microstructural evolution of thin films, unsupported nanocrystalline yttrium-stabilized zirconia (ZrO2 :16%Y or YSZ) films were examined as a function of temperature and annealing time. Grain growth, texturing, and pinhole formation were measured using transmission electron microscopy (TEM) and electron diffraction. Films were produced and subsequently annealed on metallic grids using a previously developed technique that results in near full density films at low annealing temperatures. Microstructural evolution in these films was unique compared with constrained films. Grains were found to spheroidize much more readily, ultimately resulting in the formation of porosity and pinholes. Grain growth was found to stagnate at a size particular to each annealing temperature, presumably due to the effects of Zener pinning. It is proposed that the lack of substrate strain and confinement effects allows for the dominance of surface energetics with respect to microstructural evolution. 相似文献