共查询到20条相似文献,搜索用时 593 毫秒
1.
Chickneyan ZS Briseno AL Shi X Han S Huang J Zhou F 《Journal of nanoscience and nanotechnology》2004,4(6):628-634
An approach to producing films of nanometer-sized copper oxide particulates, based on polyelectrolyte-mediated assembly of the precursor, copper(II)phthalocyanine tetrasulfonate (CPTS), is described. Multilayered CPTS and polydiallyldimethylammonium chloride (PDADMAC) were alternately assembled on different planar substrates via the layer-by-layer (LbL) procedure. The growth of CPTS multilayers was monitored by UV-visible spectrometry and quartz crystal microbalance (QCM) measurements. Both the UV-visible spectra and the QCM data showed that a fixed amount of CPTS could be attached to the substrate surface for a given adsorption cycle. Cyclic voltammograms at the CPTS/PDADMAC-covered gold electrode exhibited a decrease in peak currents with the layer number, indicating that the permeability of CPTS multilayers on the electrodes had diminished. When these CPTS multilayered films were calcined at elevated temperatures, uniform thin films composed of nanoparticulate copper oxide could be produced. Ellipsometry showed that the thickness of copper oxide nanoparticulate films could be precisely tailored by varying the thickness of CPTS multilayer films. The morphology and roughness of CPTS multilayer and copper oxide thin films were characterized by atomic force microscopy. X-ray diffraction (XRD) measurements indicated that these thin films contained both CuO and Cu2O nanoparticles. The preparation of such copper oxide thin films with the use of metal complex precursors represents a new route for the synthesis of inorganic oxide films with a controlled thickness. 相似文献
2.
Muslem F. Jawad Raid A. Ismail Khaled Z. Yahea 《Journal of Materials Science: Materials in Electronics》2011,22(9):1244-1247
In this paper, the synthesis of nanocrystalline copper oxides Cu2O and CuO thin films on glass substrates using a pulsed 532 nm Nd:YAG laser is presented. Deposition of films is achieved
at two different substrate temperatures. The influence of substrate temperature on the structural and optical properties of
copper oxide films are discussed and analyzed. The X-ray diffraction (XRD) results show that the deposited films are crystalline
in nature. Films prepared at 300 °C substrate temperature were Cu2O and has (111) and (200) diffracted peaks, while films grown at 500 °C were CuO and has (111) and (020) planes. The morphology
of deposited films were characterized by scanning electron microscope (SEM) and atomic force microscope (AFM). The optical
energy gap of Cu2O and CuO films have been determined and found to be 2.04 and 1.35 eV respectively. 相似文献
3.
Dunying Deng Tianke Qi Yuanrong Cheng Yunxia Jin Fei Xiao 《Journal of Materials Science: Materials in Electronics》2014,25(1):390-397
The copper carboxylates with different carbon chain length (glycolate, lactate and oleate) were used to prepare the metal–organic decomposition ink. TG–MS showed that copper carboxylates underwent a two-step thermal decomposition for the conversion to elemental copper, and the organic residues after decomposition is relevant with the carbon chain length. Conductive copper films were obtained by drop coating of a copper carboxylate solution onto a glass slide followed by sintering at different temperatures. Copper carboxylates with shorter carbon chain give better conductive films. Both copper glycolate and copper lactate films begin to show conductivity after sintered at 150 °C for 60 min under nitrogen. The resistivity of the copper features with 2 μm thickness of copper glycolate and copper lactate was 23.0 ± 2 and 44.0 ± 6 μΩ cm after sintering at 250 °C for 60 min under nitrogen, respectively, with the former being about 7.4 % of the conductivity of bulk copper. X-ray photoelectron spectroscopy results showed slight surface oxidation in the sintered copper feature from these copper carboxylates. Although the conductivity of the obtained copper film needs to be improved further, the method shows some advantages over the copper nanoparticles ink, such as avoiding tedious synthesis and protection of nanoparticles, low cost, etc. 相似文献
4.
Shengrong Ye Aaron R. Rathmell Yoon‐Cheol Ha Adria R. Wilson Benjamin J. Wiley 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(9):1771-1778
This paper demonstrates that Cu2O nanoparticles form in the early stages of a solution‐phase synthesis of copper nanowires, and aggregate to form the seeds from which copper nanowires grow. Removal of ethylenediamine from the synthesis leads to the rapid formation of Cu2O octahedra. These octahedra are introduced as seeds in the same copper nanowire synthesis to improve the yield of copper nanowires from 12% to >55%, and to enable independent control over the length of the nanowires. Transparent conducting films are made from nanowires with different lengths to examine the effect of nanowire aspect ratio on the film performance. 相似文献
5.
Technical Physics Letters - A method of graphene synthesis on the surface of copper foil by cold implantation of carbon recoil atoms is considered. It is established that monolayer graphene films... 相似文献
6.
The semi-conductive properties of passive films formed on copper in chromate solutions were investigated by means of capacitance measurements. The effects of the formation potential and temperature, chloride and chromate concentration in electrolyte solution, as well as measured frequency on the semi-conductive properties of passive films were studied. The results show that the passive films formed on copper display n-type semi-conductive characteristics. The slopes of the straight lines in Mott-Schottky plots decrease with moving the formation potential toward positive, increasing the chloride ion concentration, decreasing the formation temperature and the chromate solutions concentration. Moreover, the initial grain size of copper surface impacts remarkably on the semi-conductive properties. The donor density of the passive films formed on ultra-fine grained (UFG) copper is higher than that of the passive films on coarse-grained (CG) copper. 相似文献
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8.
A. M. Badalyan M. S. Polyakov V. V. Kaichev V. A. Nadolinnyi I. K. Igumenov 《Inorganic Materials》2013,49(8):775-780
Stable heterogeneous synthesis products in combined synthesis-transport processes for the growth of thin copper films have been studied by ESR, X-ray photoelectron, and IR spectroscopies. The results demonstrate that the synthesized volatile compounds condensed on solid surfaces have the form of formate-like metal complexes of copper(I). We have identified the mechanisms underlying the formation of volatile monomeric metal complexes on the surface of copper-containing precursor particles and the mechanism of the thermal decomposition of metal complexes on a heated substrate. 相似文献
9.
《材料与设计》2015
Metallic copper and copper oxide thin films were fabricated on surface of glass slide substrates. Copper oxide thin films were prepared by a hydrothermal method using an α-phase layered hydroxide, copper hydroxide nitrate as a precursor. Morphology, thickness and crystallite size of the obtained copper oxide thin films changed by changing the time of hydrothermal treatment. Accordingly, the copper oxide thin films showed various water contact angles and optical band gaps. As, the optical band gap of the nanostructured copper oxide thin films increased with an increase in hydrothermal time from 1.85 to 2.95 eV. Moreover, the water contact angles changed from 16.4 to 38.8° by changing the hydrothermal time. By a reductive hydrothermal-treatment route, the copper oxide thin film was reduced to metallic copper thin film without any particle growth. 相似文献
10.
Can hydrogen trapped within the lattice of copper film produce irreversible effects on the electrical resistivities of copper film at room temperature? In order to answer this question, copper films were sputtered in the presence of hydrogen and resistivities were measured in vacuum at room temperature. A series of sputtering depositions were carried out at different hydrogen partial pressures to confirm irreversible hydrogen effects. Films sputtered in argon only, were used as controls. The electrical resistivities of copper films were measured as a function of hydrogen partial pressure. Saturation is reached for the electrical resistivity in high hydrogen partial pressures. The saturation is at around 5.0% hydrogen partial pressure of total sputtering pressure. The electrical resistivities of copper films are lowered irreversibly by hydrogen, because the films were sputtered in the gas mixtures of argon and hydrogen and the electrical resistivities of films were measured in the air. The sputtering rate decreases as the hydrogen partial pressure increases. The sputtering rate is found to be proportional to the average mass of the incident ion. 相似文献
11.
在室温条件下采用射频磁控溅射法在涤纶平纹机织物表面沉积纳米Cu薄膜,借助原子力显微镜(AFM)观察镀膜前后样品表面变化。通过分别改变镀膜时间、溅射功率和气体压强,研究其对样品透光性和导电性的影响。实验结果表明,经Cu镀层处理的涤纶平纹织物对紫外光和可见光的吸收能力明显优于原样。溅射压强增加,透光性能增强,铜膜方块电阻增加,导电性能减弱;镀膜时间延长和溅射功率增加,样品透射率降低,屏蔽紫外线和可见光效果明显,在溅射时间接近15min和溅射功率增加到120W后,样品屏蔽效果不明显,铜膜方块电阻随溅射功率增加而减小,导电性能增强。 相似文献
12.
利用X射线衍射方法分析了电沉积铜薄膜的内应力及其织构特征.结果表明,随薄膜厚度的增加,薄膜内应力增大.电沉积铜薄膜具有较强的(220)丝织构,随着铜薄膜内应力的增加,(220)丝织构增强,同时叠加有板织构的特征. 相似文献
13.
Manisha Kundu Tsuyoshi Hasegawa Kazuya Terabe Kazuhiro Yamamoto Masakazu Aono 《Science and Technology of Advanced Materials》2008,9(3)
We examined the structural properties of copper sulfide films as a function of the sulfurization time of 70-nm-thick Cu films. Copper sulfide films with various phases such as mixed metallic Cu-chalcocite, chalcocite, roxbyite, and covellite phases were formed with increasing sulfurization time. To evaluate the structural stability of various films, all the films were exposed to the ambient atmosphere for the same amount of time. Although the phase structure and stoichiometry of the films were maintained at a greater depth, the near-surface region of the films was oxidized and covered with overlayers of oxide, hydroxide, and/or sulfate species due to the exposure and reaction with the ambient atmosphere. The oxygen uptake and its reactivity with the copper sulfide film surfaces were enhanced with increasing sulfur content of the films. In addition, the type of divalent state of copper formed on the film surfaces depended on the phase structure, composition, and stoichiometry of the films. 相似文献
14.
通过戊二醛交联制备了细菌纤维素/壳聚糖复合材料,并采用磁控溅射技术在交联复合膜表面沉积铜(Cu)纳米颗粒。利用扫描电子显微镜观察纳米纤维膜表面形貌,采用傅里叶红外光谱仪、热重分析仪和X射线衍射仪比较交联复合前后以及镀铜前后复合膜基本化学结构、热稳定性和晶面结构的变化。通过能量色散X射线光谱对壳聚糖和铜在复合膜表面的分布情况进行表征。同时借助抗菌实验探究复合膜对金黄色葡萄球菌和大肠杆菌的抗菌能力。结果表明:壳聚糖与细菌纤维素发生了有效交联,改变了细菌纤维素的基本形貌、化学结构、晶体形态以及热学性能,并且镀铜后交联复合膜的抗菌性能得到了明显的提升(膜与细菌接触20min,对金黄色葡萄球菌和大肠杆菌的抗菌效果均达到了99.999%)。 相似文献
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16.
铜在甲胺-铁氰化钾化学机械抛光液中的腐蚀与钝化 总被引:2,自引:1,他引:1
用电化学测试技术研究了腐蚀介质和成膜剂浓度对铜表面的腐蚀与钝化成膜的影响,分析了钝化膜的成分,探讨了钝化膜在抛光压力和转速作用下的磨损与表面再钝化的行为,测量了铜在化学机械抛光过程中的极化曲线。结果表明铜在甲胺溶液介质铁氰化钾抛光液中易钝化,钝化膜的主要成分为Cu4[Fe(CN)6],有少量Cu20存在。钝化膜的磨损特性随成分浓度不同而不同。钝化膜的磨损难易程度与钝化膜的本身特性、抛光压力及转速有关。抛光过程中因钝化膜被磨损,腐蚀加快,腐蚀电流密度大幅增加。配方0.1%甲胺溶液 0.5%K3Fe(CN)6 5%Al2O3可行。 相似文献
17.
CuGe films over the whole composition range were prepared by the vapour quenching of the alloys onto glass substrates held at 300 K. The electrical resistivity, thermoelectric power and temperature dependence of the films were studied in the temperature range 100–500 K. The observed behaviour of the electrical resistivity and thermoelectric power is understandable on the basis of transmission electron microscopy and electron diffraction observations which indicate three structural regions. Up to 5 at.% Ge in copper the films are single phase with a structure similar to that of pure copper; in the range 5–80 at.% Ge in copper the films consist of a mixture of Cu3Ge, copper and germanium; beyond 80 at.% the CuGe films are single-phase amorphous. 相似文献
18.
Polycrystalline copper (I) oxide films were deposited on stainless steel substrate by galvanostatic electrodeposition method
and were characterized by X-ray diffraction and scanning electron microscopy. The effect of bath temperature, bath pH and
current density on the compositon, grain size, surface texture and surface morphology of the electrodeposited films were investigated.
The films deposited at low bath pH (≤7) consisted of copper (I) oxide and metallic copper; while the films deposited at bath
pH between 8 and 12 and bath temperature of 60°C were pure copper (I) oxide. The preferred orientation of the copper (I) oxide
films depended on the relative growth rate of {111} and {200} faces and could be controlled by adjusting the bath pH and/or
the cathodic current density. (100)-oriented copper (I) oxide films could be deposited at pH=9 and current densities in the
range of 0.25–1 mA/cm2, while (111)-oriented films could be prepared at pH=12 or at pH=9 using the current densities between 1.5–2.5 mA/cm2. Computer simulated crystallite shapes showed that the crystal shape changed from octahedral for (100)-oriented film to trucated
pyramids and cubs for (111)-oriented film. And they were approved by scanning electron microscopy.
Received: 1 December 1997 / Accepted: 13 December 1997 相似文献
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20.
AbstractWe examined the structural properties of copper sulfide films as a function of the sulfurization time of 70-nm-thick Cu films. Copper sulfide films with various phases such as mixed metallic Cu-chalcocite, chalcocite, roxbyite, and covellite phases were formed with increasing sulfurization time. To evaluate the structural stability of various films, all the films were exposed to the ambient atmosphere for the same amount of time. Although the phase structure and stoichiometry of the films were maintained at a greater depth, the near-surface region of the films was oxidized and covered with overlayers of oxide, hydroxide, and/or sulfate species due to the exposure and reaction with the ambient atmosphere. The oxygen uptake and its reactivity with the copper sulfide film surfaces were enhanced with increasing sulfur content of the films. In addition, the type of divalent state of copper formed on the film surfaces depended on the phase structure, composition, and stoichiometry of the films. 相似文献