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纳米尺度金属插塞电极在现代纳米电子学中有很重要的应用价值。本文研究了用化学镀方法制备纳米尺度金属插塞电极,具有简单、低成本和自选择性的优点。化学镀甚至可以分别在硅衬底、钨衬底和氮化钛衬底上制备出直径小于50纳米的镍插塞电极。用能量色散X射线微量分析仪(EDXM)测定出用化学镀在硅衬底上制备出的纳米尺度插塞电极的主要成分是镍。最后,采用化学镀方法,制备了直径为9微米的插塞电极的垂直结构相变存储器器件。通过研究器件的电流-电压特性表明,化学镀方法可以满足器件应用要求。因此,用简单、低成本的化学镀方法来制备纳米尺度金属插塞电极,对器件的应用有重要意义。 相似文献
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激光辅助金属电沉积与无电沉积机理比较 总被引:2,自引:0,他引:2
本文介绍了激光增强金属电沉积与诱导金属无电沉积机理,比较了两种机理的区别与联系,简要说明了激光辅助金属沉积的特点和应用。 相似文献
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Tetsuya Shimogaki Masahiro Takahashi Masaaki Yamasaki Taichi Fuku Mitsuhiro Higashihat Hiroshi Ikenoue Daisuke Nakamur Tatsuo Okada 《半导体学报》2016,37(2):023001-5
Catalyst-free growth of one-dimensional zinc oxide (ZnO) nanowires is reported. ZnO nanowires were synthesized on ZnO buffer layers deposited on various-oriented sapphire substrates. Syntheses of ZnO buffer layers and nanowires were performed by ultraviolet pulsed-laser deposition. ZnO nanowire's number density was the lowest in the case of using m-cut sapphire substrates. ZnO nanowires grown on a-cut sapphire substrates had vertical alignment with distances of tens to hundreds of nanometers. On the other hand, ZnO nanowires grown on c-cut sapphire substrates had the biggest nucleation rate. The dependence of crystalline orientation of ZnO buffer layers on the orientation of sapphire substrates were investigated by electron back scatter diffraction measurement. From their results, the growth models of ZnO buffer layers were suggested and the variations in morphological properties of ZnO nanowires were discussed. 相似文献
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采用一次阳极氧化法,通过电解P型<100>晶向Si衬底上的高纯Al膜,在40V下,0.3M草酸中制备了Si基anodic aluminum oxide(AAO)模板。在Si基Al氧化过程中,通过电流密度随时间实时变化曲线的分析,研究了Si基AAO的生长机理。实验发现,电解液温度对Si基AAO制备的影响很大,在30℃下的氧化速度是在10℃下的5倍多。 相似文献
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In this study, we attempt to develop an improved approach for patterning a thin activator by decomposing palladium acetate/acetone layer on nonconductive PI substrates with the second harmonic Q-switched Nd:YAG laser, using acetone instead of toxic chloroform as solvent. In particular, we have established a simple method to identify the decomposition mechanism of palladium acetate.Our developed process can produce copper with high purity and low resistivity achieved by electroless copper deposition on this thin activator. 相似文献
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多孔氧化铝由于具有规则的纳米多孔结构,是制备各种纳米材料的良好模板,因此,研究多孔氧化铝的制备和物理性质具有重要的意义.采用阳极氧化方法制备了多孔氧化铝有序孔洞阵列,通过场发射扫描电镜(SEM)和X射线衍射(XRD)观测了样品的表面、截面的形貌和晶态结构,分析了样品的透射光谱性质.结果表明,制备的多孔氧化铝模板的孔洞分布有序,孔径大小均匀,严格垂直底面;模板具有非晶态结构,在可见光和红外波长范围内具有较高的透射性能. 相似文献
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A. Inberg Y. Shacham-Diamand E. Rabinovich G. Golan N. Croitoru 《Journal of Electronic Materials》2001,30(4):355-359
Thin Ag-W films were prepared on Si (100) substrate and on metal (Ag and Co) seed layers by electroless technology for ULSI
applications. The thin film electrical and physical parameters were studied as a function of the film composition. The thin
film composition depends on the electroless bath formula. The role of the tungsten in silver matrix was studied via measurements
of the film microhardness and thermal stability as function of the composition. The Ag-W films, thicker than 200 nm, exhibited
a specific electrical resistivity of about 2μΩ* and a reflectivity larger than 90%. These films have not corroded in air at
temperatures up to 200°C (thermal stable). Therefore, we assume that silvertungsten films can be used for applications where
reliable conducting thin films is required, such as packaging and interconnects for microelectronics. 相似文献
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我们在铝衬底上制作了不同参数条件下的阳极氧化铝(AAO)模板.通过改变初次阳极化时间来得到不同尺寸的纳米孔.改变初次阳极化时间可容易地调节,而使用刻蚀技术又可以控制氧化铝孔的长度.在该研究中,控制阳极极化和刻蚀参量成功地制备了不同直径和不同长度的AAO纳米孔.在AAO模板的竖直沟道中生长了方向性强的碳纳米管,而AAO纳米孔的直径和长度可以控制这一过程.通过二次阳极极化法制备了有着六边形孔洞排列方式的纳米AAO模板.由于AAO纳米孔的直径和长度依赖于阳极化参量,故通过控制阳极化参量就可控制AAO纳米孔的直径和长度. 相似文献
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A lithography-independent and wafer scale method to fabricate a metal nanogap structure is demonstrated. Polysilicon was first dry etched using photoresist (PR) as the etch mask patterned by photolithography. Then, by depositing conformal SiO2 on the polysilicon pattern, etching back SiO2 anisotropically in the perpendicular direction and removing the polysilicon with KOH, a sacrificial SiO2 spacer was obtained. Finally, after metal evaporation and lifting-off of the SiO2 spacer, an 82 nm metal-gap structure was achieved. The size of the nanogap is not determined by the photolithography, but by the thickness of the SiO2. The method reported in this paper is compatible with modern semiconductor technology and can be used in mass production. 相似文献
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Li Yan Wang Xiaofeng Zhang Jiayong Wang Xiaodong Fan Zhongchao Yang Fuhua 《半导体学报》2009,30(9):096003-096003-4
ture was achieved. The size of the nanogap is not determined by the photolithography, but by the thickness of the SiO2. The method reported in this paper is compatible with modern semiconductor technology and can be used in mass production. 相似文献
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Chang‐Woo Kwon Ji‐Won Son Jong‐Ho Lee Hyun‐Mi Kim Hae‐Weon Lee Ki‐Bum Kim 《Advanced functional materials》2011,21(6):1154-1159
Micro‐solid oxide fuel cells (μ‐SOFCs) are fabricated on nanoporous anodic aluminum oxide (AAO) templates with a cell structure composed of a 600‐nm‐thick AAO free‐standing membrane embedded on a Si substrate, sputter‐deposited Pt electrodes (cathode and anode) and an yttria‐stabilized zirconia (YSZ) electrolyte deposited by pulsed laser deposition (PLD). Initially, the open circuit voltages (OCVs) of the AAO‐supported μ‐SOFCs are in the range of 0.05 V to 0.78 V, which is much lower than the ideal value, depending on the average pore size of the AAO template and the thickness of the YSZ electrolyte. Transmission electron microscopy (TEM) analysis reveals the formation of pinholes in the electrolyte layer that originate from the porous nature of the underlying AAO membrane. In order to clog these pinholes, a 20‐nm thick Al2O3 layer is deposited by atomic layer deposition (ALD) on top of the 300‐nm thick YSZ layer and another 600‐nm thick YSZ layer is deposited after removing the top intermittent Al2O3 layer. Fuel cell devices fabricated in this way manifest OCVs of 1.02 V, and a maximum power density of 350 mW cm?2 at 500 °C. 相似文献
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K. Tennakone V. P. S. Perera I. R. M. Kottegoda L. A. A. De Silva G. R. R. A. Kumara A. Konno 《Journal of Electronic Materials》2001,30(8):992-996
The heterojunction n-SnO2/Ru-dye/p-CuI prepared by deposition of the ruthernium bipyridyl dye on a meso-porous film of SnO2 followed by deposition of p-CuI was found to be inactive with respect to visible light photoresponse and dark current rectification.
However, n-SnO2/Al2O3/Ru-dye/p-CuI where the dye is coated on a thin film on Al2O3 first deposited on SnO2, delivered a short-circuit current density of 1.7 mAcm−2 and an open-circuit voltage of 350 mV, behaving as a dye-sensitized solid-state photovoltaic cell. This result is explained
as a transfer of energetic electrons released by excitation of the dye molecules to the conduction band of SnO2 via tunneling across the thin layer of Al2O3. The implications of the result on suppression of recombination in dye-sensitized photovoltaic cells are discussed. 相似文献
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Experimental results are presented on modifications of the surface properties of ZrO2 ceramics exposed in air to radiation of either a KrF laser (λ=248 nm) or an ArF laser (λ=193 nm) with a pulse duration of 15–20 ns. The modifications of their diffuse reflectance spectra (DRS) are studied as a function of the laser beam parameters. The ablated parts of ZrO2 take on the ability to reduce metals (Cu or Ni) from their respective electroless plating solutions. The electrolessly deposited metal can be patterned via local annealing of the ablated areas with the help of a CW laser, either Ar+ or CO2. The catalytic activity of laser-treated ZrO2 ceramics towards the electroless deposition of metals is discussed from the viewpoint of the formation of an oxygen-deficient surface under laser ablation. The possibility of ZrO2 activation for electroless metal deposition using a scanning beam of a low-power CO2 laser is demonstrated. © 1997 John Wiley & Sons, Ltd. 相似文献
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J. Zhong S. Muthukumar G. Saraf H. Chen Y. Chen Y. Lu 《Journal of Electronic Materials》2004,33(6):654-657
The ZnO nanotips are grown on silicon and silicon-on-sapphire (SOS) substrates using the metal-organic chemical-vapor deposition
(MOCVD) technique. The ZnO nanotips are found to be single crystal and vertically aligned along the c-axis. In-situ Ga doping
is carried out during the MOCVD growth. The ZnO nanotips display strong near-band edge photoluminescence (PL) emission with
negligible deep-level emission. Free excitonic emission dominates the 77-K PL spectrum of the as-grown, undoped ZnO nanotips,
indicating good optical properties and a low defect concentration of the nanotips. The increase of PL intensity from Ga doping
is attributed to Ga-related impurity band emission. Photoluminescence quenching is also observed because of heavy Ga doping.
ZnO nanotips grown on Si can be patterned through photolithography and etching processes, providing the potential for integrating
ZnO nanotip arrays with Si devices. 相似文献
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Controlled Fabrication of Hierarchically Structured Nitrogen‐Doped Carbon Nanotubes as a Highly Active Bifunctional Oxygen Electrocatalyst 下载免费PDF全文
Xianglong Zhao Feng Li Ruining Wang Jeong‐Min Seo Hyun‐Jung Choi Sun‐Min Jung Javeed Mahmood In‐Yup Jeon Jong‐Beom Baek 《Advanced functional materials》2017,27(9)
Hierarchically structured nitrogen‐doped carbon nanotube (NCNT) composites, with copper (Cu) nanoparticles embedded uniformly within the nanotube walls and cobalt oxide (CoxOy) nanoparticles decorated on the nanotube surfaces, are fabricated via a combinational process. This process involves the growth of Cu embedded CNTs by low‐ and high‐temperature chemical vapor deposition, post‐treatment with ammonia for nitrogen doping of these CNTs, precipitation‐assisted separation of NCNTs from cobalt nitrate aqueous solution, and finally thermal annealing for CoxOy decoration. Theoretical calculations show that interaction of Cu nanoparticles with CNT walls can effectively decrease the work function of CNT surfaces and improve adsorption of hydroxyl ions onto the CNT surfaces. Thus, the activities of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are significantly enhanced. Because of this benefit, further nitrogen doping, and synergistic coupling between CoxOy and NCNTs, Cu@NCNT/CoxOy composites exhibit ORR activity comparable to that of commercial Pt/C catalysts and high OER activity (outperforming that of IrO2 catalysts). More importantly, the composites display superior long‐term stability for both ORR and OER. This simple but general synthesis protocol can be extended to design and synthesis of other metal/metal oxide systems for fabrication of high‐performance carbon‐based electrocatalysts with multifunctional catalytic activities. 相似文献
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R. Venugopal J. Wan M. Melloch G. Kim G. Zank S. Tsoi A. Ramdas 《Journal of Electronic Materials》2003,32(5):371-374
A comparison of gallium-nitride (GaN) films grown on large-area Si(111) using a single aluminum-nitride (AlN) buffer, an AlN/graded-AlxGa1−xN buffer, and the introduction of additional low-temperature (LT)-grown AlN interlayers is reported. A graded-AlGaN buffer
followed by additional LT-AlN interlayers is shown to completely eliminate cracking in nitride films of thickness >2 μm and
also reduce the threading-dislocation density significantly. A partial compensation of GaN-tensile strain by the compressive-lattice
strain induced by the AlGaN and AlN layers is responsible for this effect. The surface roughness is increased by the introduction
of the LT-AlN buffers. 相似文献