共查询到20条相似文献,搜索用时 46 毫秒
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使用自行设计的真空系统,采用介质阻挡放电等离子体增强化学气相沉积(DBD-PECVD)法,分别以CH4/N2、C2H2/N2、C2H4/N2混合气体作为反应气体,在单晶硅片上成功制备了CN薄膜.FTIR结果证实了薄膜中碳氮原子结合成化学键,Raman结果说明薄膜中含有类金刚石结构,AFM结果表明薄膜粗糙度随放电气压的升高而逐渐增大.三种混合气体沉积的CN薄膜,以CH4/N2的沉积速度最慢,薄膜表面粗糙度最小,含H量最少;C2H2/N2的沉积速度最快,薄膜表面粗糙度最大. 相似文献
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采用热饱和溶液法,通过调控前驱体溶液1,4-丁内酯中PbI2和CH3NH3I的配比,进而对前驱液100℃进行加热,简单易操作地得到单晶CH3NH3PbI3。计算了不同调控条件下单晶CH3NH3PbI3的产率;利用SEM和XRD对其形貌和结晶度进行表征;通过吸收和荧光光谱对单晶的光谱性能进行表征。结果表明,单晶CH3NH3PbI3的最佳摩尔配比为n(PbI2)∶n(CH3NH3I)=2.3∶1,PbI2最佳浓度为1.229 mmol/mL。 相似文献
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不同衬底上LaNiO3导电氧化物薄膜的制备和研究 总被引:2,自引:0,他引:2
通过MOD法和快速热处理过程,在Si(100)和Pt(111)/Ti/SiO2/Si衬底上制备了LaNiO3(LNO)导电氧化物薄膜.经XRD结构分析表明,所制备的LNO薄膜具有纯的钙钛矿结构,并且以(100)方向择优取向.经SEM和AFM分析表明,LNO薄膜具有表面均匀、无裂纹.经标准四探针法测试表明,LNO薄膜具有好的金属特性,其室温电阻率为7.6×10-4Ω·cm.铁电性能测试表明,LNO薄膜可以提高PZT铁电薄膜的剩余极化强度. 相似文献
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SnO2:F导电薄膜的制备方法和性能表征 总被引:1,自引:1,他引:0
采用喷雾热分解(Spray pyrolysis)方法,以NH4F、SnCl2·2H2O为原料,对反应液配方进行了优化,在普通玻璃衬底上制备出了光电性能优良的掺F二氧化锡透明导电薄膜.采用X射线衍射仪(XRD)、扫描电镜(SEM)、紫外-可见分光光度计(UV/VIS)对薄膜的结构、形貌、光学、电学特征进行了表征和分析.结果表明:在衬底温度为500℃, NH4F/SnCl2·2H2O的质量百分比为20%,喷涂时间为15s时掺F二氧化锡薄膜的方块电阻最低达到6.2Ω/□,可见光透射率为86.95%,且薄膜晶粒均匀,表面形貌平整致密. 相似文献
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《真空科学与技术学报》2001,21(6):440-444
用原子力显微镜(AFM)、X射线衍射(XRD)、红外光谱(IR)及紫外-可见光谱(UV/VIS)研究了在氩(Ar)气氛下制备的C60薄膜的表面形貌、结构及光吸收特性.发现其UV/VIS的强度和吸收峰位置明显不同于在真空中制备的G60薄膜.与真空中制备的C60薄膜比较,所研究薄膜的红外谱没有变化,但X射线衍射表明其结构从面心立方(fcc)相变成fcc相与六角密堆(hcp)相的混合相.AFM表明,在Ar气氛中制备的C60薄膜有较大的表面粒子,并且表面生长岛更尖锐.这将有利于G60薄膜的场电子发射. 相似文献
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H2C2O4稳定剂对SOl-Gel法制备LiNbO3薄膜的影响 总被引:1,自引:0,他引:1
研究了分别以H2C2O,HNO3,HCOOH和CH3COOH作稳定剂的LiNbO3薄膜先驱液的稳定性,发现H2C2O4作稳定剂的先驱液的稳定性最好,用sol-gel法在Si(110)基板上制备了以H2C2O4作稳定剂的LiNbO3薄膜,并对LiNbO3薄膜进行了IR,XRD和SEM表征,结果表明,生成的LiNbO3为多晶,与HNO3相比,以H2C2O4作稳定剂制备的LiNbO3薄膜形貌较差。 相似文献
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钙钛矿太阳能电池中传统空穴传输层Spiro-OMeTAD存在昂贵、易污染环境且制备困难等缺点,本工作采用氧化石墨烯(Graphene oxide,GO)作为空穴传输层,研究了不同浓度GO溶液制备的衬底对器件光电性能的影响.首先,采用旋涂法制备了GO薄膜,通过对分散液浓度的控制获得了不同厚度的GO衬底.其次,制备了结构为ITO/GO/CH3 NH3 PbI3/PCBM/Ag的平面型器件,对不同GO衬底的器件的光电性能进行表征及对比分析.研究表明:GO衬底缺陷会抑制CH3 NH3 PbI3晶粒的择优取向生长,形成可诱导CH3 NH3 PbI3晶粒产生横向聚集的籽晶,从而改善钙钛矿薄膜的成膜性,并增大钙钛矿晶粒尺寸.由浓度为0.25 mg/mL的分散液制备的GO薄膜衬底上生长的钙钛矿晶粒尺寸最大为900 nm.此外,该浓度对应的GO衬底上制备的钙钛矿薄膜的光致发光相对强度峰值为2000,电荷转移效率相对最高,为52.8%.由该衬底制备的GO基钙钛矿太阳能电池的光电转化效率最高可提升至8.69%. 相似文献
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We have synthesized a variety of alkali-metal and ammonium fluorosulfatometallates (titanates, zirconates, and hafnates). The alkali fluorosulfatozirconates and fluorosulfatohafnates have been shown to exhibit efficient roentgenoluminescence (RL) in the UV through visible spectral region, with a maximum at 390–440 nm. Their RL spectra depend significantly on their composition (cation, anion, and water content), coordination of KF and K2SO4, and relative amounts of fluorine and SO4 groups. We have examined the effect of heat treatment on the RL of these compounds. The rubidium and cesium fluorosulfatozirconates Rb3Zr2F9SO4 · 2H2O, Cs2ZrF2(SO4)2 · 2H2O, Cs8Zr4F2(SO4)11 · 16H2O, and Cs2ZrF4SO4 offer the most efficient RL. 相似文献
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Yongkang Chen Mike Bacich Cory Nardin Albert Sitorus Mark M. Weislogel 《Microgravity science and technology》2005,17(4):14-24
The behavior of wall-bound drops and bubbles is fundamental to many natural and industrial processes. Key characteristics
of such capillary systems include interface shape and stability for a variety of gravity levels and orientations. Significant
solutions are in hand for axisymmetric pendent drops for a variety of uniform boundary conditions along the contact line with
gravity acting normal to a planar wall. The special case of a wall-bound drop or bubble that is also pinned at an edge (i.e.
a ‘wall-edge-bound’ drop) is considered here where numerical solutions are obtained for interface shape and stability as functions
of drop volume, contact angle, fluid properties, and uniform gravity vector. For a semi-infinite zero-thickness planar wall
(plate), a critical contact angle is identified below which wall-edge-bound drops are always stable. The critical contact
angle is computed as a function of the gravity vector. The numerical procedure, which makes no account for contact angle hysteresis,
predicts that such wall-edge-bound drops are unconditionally unstable for any gravity field with a component that is tangent
to the wall while inwardly normal to the edge. Select experiments are conducted that support the conclusions drawn from the
numerical results. 相似文献
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《Measurement Techniques》1975,18(12):1719-1725
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A. M. Grishin 《Journal of Engineering Physics and Thermophysics》2001,74(4):895-903
Basic definitions and concepts of the physicomathematical theory of natural catastrophes are given. Possibilities of mathematical modeling of natural and technogenic catastrophes are discussed in the context of the theory of heat and mass transfer and the mechanics of reacting media. The importance of taking into account conjugate heat and mass exchange in modeling catastrophes is emphasized. A formula for evaluating the probability of a collisional catastrophe is given. 相似文献
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Wiwanitkit V 《Hemodialysis international. International Symposium on Home Hemodialysis》2012,16(1):116; author reply 116-116; author reply 117
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Velev JP Jaswal SS Tsymbal EY 《Philosophical transactions. Series A, Mathematical, physical, and engineering sciences》2011,369(1948):3069-3097
The existence of multiple ferroic orders in the same material and the coupling between them have been known for decades. However, these phenomena have mostly remained the theoretical domain owing to the fact that in single-phase materials such couplings are rare and weak. This situation has changed dramatically recently for at least two reasons: first, advances in materials fabrication have made it possible to manufacture these materials in structures of lower dimensionality, such as thin films or wires, or in compound structures such as laminates and epitaxial-layered heterostructures. In these designed materials, new degrees of freedom are accessible in which the coupling between ferroic orders can be greatly enhanced. Second, the miniaturization trend in conventional electronics is approaching the limits beyond which the reduction of the electronic element is becoming more and more difficult. One way to continue the current trends in computer power and storage increase, without further size reduction, is to use multi-functional materials that would enable new device capabilities. Here, we review the field of multi-ferroic (MF) and magnetoelectric (ME) materials, putting the emphasis on electronic effects at ME interfaces and MF tunnel junctions. 相似文献