单槽脉冲电沉积法制备FePt薄膜

以FeSO4.7H2O和H2PtCl6.6H2O分别作为Fe2+源和Pt4+源,以铂片为阳极,纯铜片为阴极,采用单槽脉冲电沉积法制备FePt薄膜,通过X-射线衍射仪(XRD)、带有能谱的场发射扫描电镜(FESEM-EDAX)、振动样品磁强计(VSM)分析手段对薄膜进行了表征。结果表明,新制备的FePt薄膜组成为Fe22Pt58O20,具有面心立方(fcc)结构,FePt薄膜的矫顽力为2.0 kA/m,饱和磁化强度为420 kA/m,具有软磁性。     

电化学沉积法制备薄膜、涂层材料研究进展

概述了电化学沉积法的发展历史和优点。介绍了电化学沉积法的沉积机理和沉积方法,工艺条件与参数及其影响因素。综述了电化学沉积在制备薄膜、涂层材料方面的主要研究进展,并对未来的研究方向进行了展望。     

电化学法制备薄膜材料研究进展

电化学沉积是一门古老的技术。在19世纪早期，如1840年即已出现了银和金的镀覆专利。不久以后又发明了镀镍技术。电镀铬工艺至今也约有一个世纪。随着科学技术的不断发展和深入，电化学沉积的研究领域不断拓宽和扩展，已迅速地发展成为具有重大工业意义的一门技术，并已获得了巨大的成功。传统的电沉积过程，如CuNiCr强调的是装饰性和防腐性。今天，具有特殊用途的镀层的研究、开发和应用则已成为核心内容。     

电化学沉积制备半导体CuInSe2薄膜

本文报道恒电位法在pH为1.35的Cu2SO4、SeO2、In2(SO4)3溶液中,在Ti电极上电化学沉积制备CuInSe2纳米薄膜。研究络合剂柠檬酸和酒石酸对制备CuInSe2纳米薄膜的影响。扫描电子显微镜（SEM）结果表明,加入络合剂后,电化学沉积的薄膜表面颗粒分布更均匀、致密。X射线衍射（XRD）分析显示,制备的CuInSe2薄膜是黄铜矿和闪锌矿相的混合物,添加柠檬酸和酒石酸后,衍射峰增强,晶形变好,制备的薄膜颗粒尺寸大小在250nm左右,造成粒度增大的原因是由于颗粒的团聚作用。     

电化学沉积法制备钇稳定ZrO2(YSZ)薄膜

引　言钇稳定二氧化锆 (ＹＳＺ)是制备氧化物燃料电池和氧传感器的重要材料 .电解质薄膜化是开发高输出电流密度的固体氧化物燃料电池和高灵敏度的传感器的研究方向 .电化学气相沉积 (ＥＶＤ) [1～ 3] 制得的薄膜致密 ,且厚度仅 2 0～ 4 0 μｍ ,薄膜性能优良 ,但设备复杂 ,制备成本高 ,反应生成的氯气腐蚀性大 .激光沉积法具有设备复杂、成本高等问题 .等离子喷涂 (ＶＰＳ、ＡＰＳ) [4 ,5] 适于大规模制膜 ,但薄膜不够致密 ,裂缝较多 .溶胶 -凝胶法 (Ｓｏｌ -Ｇｅｌ) [4 ,6 ,7] 制得的ＹＳＺ薄膜致密且薄 ,设备简单 ,但对于基片要求很严 ,…     

电化学沉积铁基软磁合金薄膜的研究进展

铁基合金软磁薄膜具有高饱和磁通密度、低矫顽力,高磁导率、高电阻率、低损耗等特点,广泛应用于电子信息、国防、航空航天等领域.阐述了铁基合金软磁薄膜的制备方法,电化学沉积铁基合金薄膜的特点、种类和性质,并概述了电化学沉积铁基合金镀层的研究趋势.     

磁场下电沉积制备Co-Pt-P磁性薄膜

在磁场下电沉积制备Co-Pt-P磁性薄膜。研究了电流、温度、磁场强度对薄膜性能的影响。结果表明:磁场对镀层的成分、微观结构及磁性能有一定程度的影响。     

L1_0有序FePt磁记录薄膜研究进展

L10有序FePt合金薄膜具有高磁晶各向异性能、高矫顽力、高磁能积、高居里温度和抗腐蚀能力强等优点,能够满足超高密度磁记录的要求,极有可能成为下一代超高密度磁存储介质。详细介绍了FePt薄膜近年来的研究成果,分析了降低FePt有序化温度,减小FePt颗粒的粒径,减弱晶粒间相互作用和控制其易磁化轴取向的方法,并对其应用前景作了分析。     

电化学沉积CdSe纳晶薄膜的性能及沉积机理

电化学沉积ＣｄＳｅ纳晶薄膜的性能及沉积机理王维波林瑞峰林原萧绪瑞（中国科学院感光化学研究所,光电化学中心,北京１００１０１）陈旭光杨勇（厦门大学固体表面物理化学国家重点实验室,厦门３６１００５）关键词ＣｄＳｅ纳晶薄膜,电化学沉积,扫描隧道显微镜...     

电沉积Cu2xIn2—2xSe2薄膜的光电化学研究

用电沉积法制得Ｃｕ２ｘＩｎ２－２ｘＳｅ２（铜铟硒）（０＜ｘ＜１）薄膜＾［１］并用ＥＤＡＸ对其组成进行分析。对薄膜电极的光电化学性能、光谱响应、能隙与ｘ的依赖关系进行了研究。借助于现场微区扫描光电流谱观察了热处理、薄膜厚度、光极化对薄膜电极的光电性能影响。研究了Ｐｂ（ＮＯ３）２有效的浸渍对簿膜光电性能的影响。     

B掺杂FePt基纳米复合膜的制备与磁学性能研究

利用磁控溅射法将厚度可控的B掺杂到FePt多层膜中,构成FePtB多层膜体系。多层膜结构采用中间层掺杂和底层掺杂等方式组合,由此研究热处理温度与B掺杂对FePtB多层膜体系磁学性能的影响,分析成相过程。另一方面,B层作为中间层掺杂到FePt多层膜样品中构成不同B掺杂浓度的多层膜体系,通过X射线衍射等表征手段研究不同的掺杂浓度对FePt多层膜样品成相及退火温度的影响。实验结果表明,B掺杂的FePt多层膜样品的矫顽力大幅度提高,出现垂直择优取向;随着B层厚度的增加,FePtB多层膜体系的磁有序相比例增加,当B层为14nm时,FePtB多层膜体系展现良好的垂直取向特性。此外,B掺杂降低了FePt多层膜样品的退火温度。     

Nanodiamond crystallites embedded in carbon films prepared by thermionic vacuum arc method

Nanostructured carbon films with thicknesses of 100 and 200 nm have been deposited from pure vapour carbon plasma using an original thermionic vacuum arc method. Silicon single crystalline wafers, glass and stainless steel held at 400 °C were used for substrates. The films consist of diamond nanoparticles of 5 nm diameter on the average embedded in a disordered graphite matrix as revealed by HRTEM, XPS and visible Raman measurements. The graphitic cluster diameters La range from 1.5 to 2.3 nm. Thicker films (200 nm) on stainless steel exhibit the largest clusters.     

Study on Composition Distribution and Ferromagnetism of Monodisperse FePt Nanoparticles

Monodisperse FePt nanoparticles with size of 4.5 and 6.0 nm were prepared by simultaneous reduction of platinum acetylacetonate and thermal decomposition of iron pentacarbonyl in benzylether. The crystallography structure, size, and composition of the FePt nanoparticles were examined by X-ray diffraction and transmission electron microscopy. Energy dispersive X-ray spectrometry measurements of individual particles indicate a broad compositional distribution in both the 4.5 and 6 nm FePt nanoparticles. The effects of compositional distribution on the phase-transition and magnetic properties of the FePt nanoparticles were investigated.     

自交联型丙烯酸阴极电泳涂料树脂的合成

采用甲基丙烯酸二甲胺基乙酯(DMAEMA)、甲基丙烯酸β羟乙酯(HEMA)、N-羟甲基丙烯酰胺(NHMA)、甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)等单体合成了自交联型丙烯酸阴极电泳涂料,研究了影响树脂水溶性和漆膜性能的因素。实验结果表明,DMAEMA、HEMA、NHMA用量分别为单体用量的16%、15%、6%,引发剂偶氮二异丁腈(AIBN)的用量为单体用量的2%,合成反应2 h,电泳电压125 V时,可得到综合性能良好的高装饰性自交联型丙烯酸阴极电泳涂膜。电泳漆膜外观平整光亮,性能优良,膜厚可达22μm,光泽度(20°)可达123.9,适用于要求高装饰性表面的涂装。     

有机物原位包裹Co微米球的溶剂热制备

以醋酸钴为钴源,乙二醇为溶剂,氢氧化钠为添加剂,三嵌段共聚物P123为表面活性剂,采用溶剂热法一步制备了有机物包裹的Co微米颗粒。通过表征测试发现,有机物包裹的Co微米颗粒为球状,粒径均匀,尺寸约5 μm左右。通过热重以及磁性能测试发现,所制备的有机物包裹Co微米颗粒在450 ℃以内热稳定性良好;饱和磁感应强度高达169 emu/g,矫顽力低至50 Oe,剩磁在10 emu/g以内,软磁性能良好。本研究中以常用溶剂水、乙醇为参照组进行了对比实验,并对样品进行了表征和性能测试。此外,本研究进一步探讨了表面活性剂P123对样品结构及性能的影响。     

表面活性剂调节高矫顽力FePt纳米颗粒的合成

在表面活性剂聚乙烯吡咯烷酮(PVP)存在的体系中,通过NaBH4还原前驱体Fe(acac)3和H2PtCl6·6H2O,制备出了单分散的尺寸在3.0 nm左右的FePt纳米颗粒。XRD和TEM表征结果显示,表面活性剂PVP的用量影响FePt纳米颗粒相变,但对颗粒的尺寸无明显作用。由此推测,PVP对FePt纳米颗粒的相变起"催化"作用,适量的PVP诱导纳米颗粒的相变,可以通过改变表面活性剂的用量来调节FePt纳米颗粒的磁性能,当表面活性剂PVP单体与FePt前驱体的摩尔比(PVP/FePt)为7时,制得的FePt纳米颗粒经过500℃保温30 min热处理后,矫顽力高达5.2 kOe。     

Magnetic Properties of FePt Nanoparticles Prepared by a Micellar Method

FePt nanoparticles with average size of 9 nm were synthesized using a diblock polymer micellar method combined with plasma treatment. To prevent from oxidation under ambient conditions, immediately after plasma treatment, the FePt nanoparticle arrays were in situ transferred into the film-growth chamber where they were covered by an SiO₂ overlayer. A nearly complete transformation of L1₀ FePt was achieved for samples annealed at temperatures above 700 °C. The well control on the FePt stoichiometry and avoidance from surface oxidation largely enhanced the coercivity, and a value as high as 10 kOe was obtained in this study. An evaluation of magnetic interactions was made using the so-called isothermal remanence (IRM) and dc-demagnetization (DCD) remanence curves and Kelly–Henkel plots (ΔM measurement). The ΔM measurement reveals that the resultant FePt nanoparticles exhibit a rather weak interparticle dipolar coupling, and the absence of interparticle exchange interaction suggests no significant particle agglomeration occurred during the post-annealing. Additionally, a slight parallel magnetic anisotropy was also observed. The results indicate the micellar method has a high potential in preparing FePt nanoparticle arrays used for ultrahigh density recording media.     

Quality optimization of Bi2212 films prepared by aqueous solvent sol-gel method with nonionic surfactants

In this paper, Bi2212 films were prepared on LaAlO₃(100) and SrTiO₃(100) substrates by the sol-gel method using Bi(NO₃)₃·5H₂O, Sr(NO₃)₂, Ca(NO₃)₂·4H₂O and Cu(NO₃)₂·3H₂O as raw materials. TritonX-100 (TX-100), fatty alcohol poly oxyethylene ether (AEO-9), poly (vinylpyrrolidone) (PVP) and poly (vinyl alcohol) (PVA) were used as surfactants, respectively, to improve the wettability between the sol and the substrate. When glycine and glycolic acid were used as complexing agents, these surfactants were stably miscible with the sols. The effects of different surfactant sol-gel systems on the wettability of substrates as well as the crystallinity, morphology, surface roughness and electrical transport properties of Bi2212 superconducting films were investigated. The results showed that flat and continuous c-axis epitaxial Bi2212 films were obtained using all these sol-gel systems. In particular, TX-100 and AEO-9 as surfactants showed stronger wettability of the sol-gel for both substrates. In addition, the films prepared using polymer surfactants PVP and PVA sol-gel systems showed less surface roughness. The same patterns were found in all the film samples prepared using precursor sols of different complexing agents, and all the films exhibited good electrical transport properties. This work lays a certain research foundation for the preparation of thin films by aqueous solvent sol-gel method. The method also shows great potential in terms of the stability of different sol-gel systems and the improvement of the wettability of different substrates.