直流热阴极PCVD法掺氮纳米金刚石薄膜形貌及结构的影响

采用直流热阴极等离子体化学气相沉积(PCVD)技术,通过在CH4/H2的混合反应气源中通入不同流量的N2,合成了掺氮纳米金刚石薄膜。结果表明随着氮气流量的增加,金刚石薄膜表面形貌发生明显变化:晶粒细化,晶界和缺陷有所增多,膜层由尺寸较大微晶颗粒转向纳米级菜花状结构,并且薄膜表面粗糙度相应变小。同时薄膜中非金刚石组份相对逐渐增多。氮气的引入可以促进金刚石二次形核,抑制金刚石大颗粒生长,对薄膜的生长取向、形貌及结构都产生一定影响。     

直流热阴极PCVD法间歇生长模式间歇周期的研究

采用直流热阴极PCVD方法间歇生长模式,在CH4-H2气氛常规制备微米晶金刚石膜的参数条件下,利用人工干预二次形核工艺,研究了间歇周期变化对制备纳米晶金刚石膜的影响.人工干预二次形核是指通过生长温度的周期性改变而诱发二次形核行为,从而实现金刚石膜的纳米晶生长.金刚石膜周期性生长过程分为沉积阶段和干预阶段,沉积阶段主要完成金刚石膜的生长,干预阶段将沉积温度降低到600℃,然后恢复到生长温度,即完成一个生长周期.间歇周期研究主要是考察在不同间歇时间里人工干预诱导二次形核的效果,间歇时间设定为1 min、5 min、10 min、15min、20 min,生长时间设为20 min,总的沉积时间为6 h.采用拉曼光谱仪、SEM和XRD对样品进行了分析,结果表明直流热阴极PCVD方法间歇生长模式,间歇周期的变化,对二次形核的发生有诱导作用,适当选择间歇周期,有利于二次形核基团的生成.     

Bilayered nanofilm of polypyrrole and poly(DMcT) for high-performance battery cathodes

Bilayered nanofilm electrodes made of polypyrrole (Ppy) and poly-2,5-dimercapto-1,3,4-thiadiazole (poly-DMcT) are produced by electrochemical means onto a carbon-fiber substrate, with the goal of preventing the loss of the electroactive mass of the disulfide and improving the electrode stability during the charge/discharge cycling process. Lightweight and high surface area composites are obtained by potentiostatically depositing a nanometric layer of Ppy onto a carbon fiber piece already supporting a layer of a potentiodynamically obtained poly(DMcT) film. The growth charge/mass ratio for the bilayered polymeric electrode is optimized, leading to a high electrochemical performance cathode with a stable specific capacity of ∼320 mA h g⁻¹ after 100 cycles.     

膜厚对多晶硅纳米薄膜压阻温度特性的影响

重掺杂多晶硅纳米薄膜具有良好的压阻温度特性,用它制作高温压阻式传感器灵敏度高、成本低,具有广阔的应用前景.为优化多晶硅纳米薄膜的压阻温度特性,本文采用低压化学气相淀积(LPCVD)技术制作了不同膜厚(30～250 nm)的多晶硅薄膜,分别测试了应变系数、薄膜电阻率与工作温度的关系.利用扫描电镜(SEM)和X射线衍射实验(XRD)对薄膜进行了表征,在此基础上结合隧道压阻模型分析了膜厚对多晶硅薄膜压阻温度特性的影响,结果表明,对于淀积温度620℃、掺杂浓度2.3×1020 cm-3的多晶硅纳米薄膜,膜厚的最佳值在80 nm厚左右.     

溶胶-凝胶工艺制备SrTiO3纳米薄膜的研究

采用溶胶-凝胶方法,以醋酸锶、钛酸四丁酯为前驱体,乙酰丙酮为螯合剂,乙二醇甲醚为溶剂,乙酸为助溶剂和催化剂制备溶胶,用旋涂法在Si(100)衬底上制备出了具有典型钙钛矿型结构的SrTiO3纳米薄膜.用XRD、AFM、SEM和椭圆偏光仪等手段分析了薄膜的性能,结果显示薄膜的表面均匀、无裂纹、厚度20～30nm,折射率1.75～1.85,晶粒度35～60nm,表面平均粗糙度RMS为3.4～3.8 nm,晶粒形貌呈类圆锥形态.     

Seeded growth fabrication of Cu-on-Si electrodes for in situ ATR-SEIRAS applications

A seeded-growth approach has been developed to fabricate a Cu nanoparticle film (simplified hereafter with nanofilm) on Si for electrochemical ATR surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS). The approach comprises an initial activation of the reflecting plane of hemicylindrical Si prism by introducing a Cu seed layer in a CuSO₄-HF solution and the subsequent electroless deposition of the Cu nanofilms from an electroless Cu plating bath. The as-deposited Cu nanofilm exhibited strong SEIRA effect for the CO probe and interfacial free H₂O. ATR-SEIRAS was also applied to characterize the adsorbed geometries of pyridine at the Cu/electrolyte interface. Only vibrational bands assignable to the A₁ symmetry modes were detected in the entire potential window investigated, suggestive of an end-on adsorption via the ring N-atom on a Cu electrode.     

Carrier Density and Plasma Frequency of Aluminum Nanofilms

In this work, the prerequisite and mode of electromagnetic response of Al nanofilms to electromagnetic wave field was suggested.Reflectance, transmittance in infrared region and carrier density of the films was measured. With the carrier density of the films, the dependence of their plasma frequencies on the film thickness was obtained. On the other hand, the dependence of absorptance on the frequency of electromagnetic wave field was set up by using the measured reflectance and transmittance,which provided plasma frequency-film thickness relation as well. Similarity of both plasma frequency-film thickness relations proved plasma resonance as a mode of electromagnetic response in Al nanofilms.     

化学沉积法制备的Ni(P)、Ni(B)纳米薄膜的结构与磁性

用化学沉积法制备了系列Ni(P),Ni(B)合金薄膜样品，用X射线衍射结构分析方法证明样品由尺寸为纳米量级的颗粒组成，样品在磁性上表现出超顺磁性，对热磁处理前后的磁学参数进行了比较研究。     

Study of influencing factors and the mechanism of preparing triazinedithiol polymeric nanofilms on aluminum surfaces

Triazinedithiol polymeric nanofilm was prepared on a pure aluminum surface by electrochemical polymerization of AF17N. The mechanism of the process was proposed and electrochemical polymerization parameters were investigated. The triazinedithiol polymeric nanofilm had notable lubricity, high dielectric property and superhydrophobic property due to the allyl and fluoro alkyl groups in the AF17N monomer. The chemical structure of poly (6-(N-allyl-1,1,2,2-tetrahydroperfluorodecyl)amino-1,3,5-triazine-2,4-dithiol monosodium) nanofilm (PAF17) was investigated by analysis of FT-IR spectra and X-ray photoelectron spectroscopy (XPS). The optimal conditions for the preparation process were based on the data of film weight and thickness. The optimal parameters of monomer concentration, electropolymerization time and temperature were 5 mM, 6 min and 15 °C, respectively. The electropolymerization mechanism was a radical polymerization reaction. It is expected that this technique will be applied in industrial fields for aluminum and aluminum alloy to achieve functional surfaces.     

纳米Pt膜的晶粒尺寸及其对热导率的影响

采用电子束-物理气相沉积法（EB-PVD）制备了6个厚度为15-62nm的铂薄膜，研究了纳米薄膜的晶粒尺寸及其对热导率的影响规律．当薄膜厚度小于30nm时，晶粒平均尺寸接近于薄膜的厚度；晶粒尺寸随着薄膜厚度的增加而增大并趋于定值；当薄膜厚度大于30nm时，晶粒尺寸约为20nm．受薄膜的表面和内部晶界的综合影响，铂纳米薄膜的热导率大大低于体材料的值，并且纳米薄膜的热导率随着薄膜厚度的增加而增大并趋于一个低于体材料热导率的值．