恒流法制备图案化的阳极氧化铝模板

采用紫外线光刻技术在铝片上生成预设图案,用恒流二次氧化法在图案化的铝片上生长AAO,以此模板制备了PS和Cu纳米线阵列.采用扫描电子显微镜(SEM)分析.结果表明,制备的图案是直径5μm的圆形组成,圆形图案中·心之间距离是10μm,每个圆中生长了均匀的AAO,孔径大约为60～80nm.     

铜纳米线阵列的模板组装

采用电解法溶解多孔阳极氧化铝(PAA)模板的阻挡层,用直流电沉积的方法在模板中组装了铜纳米线阵列.分别用扫描电镜和X射线衍射表征铜纳米线阵列的形貌和晶体结构,用电化学法表征了铜纳米线阵列的电催化性能.结果表明,PAA去阻挡层后,伏安图上出现一个阳极氧化峰.恒电位沉积的铜纳米线直径为22nm,沿(111)晶面择优取向.铜纳米线阵列电极能催化亚硝酸根的还原,其催化电流比本体铜电极上大2倍,峰电位正移80mV.纳米铜阵列电极可用于亚硝酸盐的电化学检测.     

交流电化学沉积铜纳米线阵列及其机理探讨

利用二次阳极氧化的方法制备孔高度有序的阳极氧化铝(AAO)为模板,采用交流电化学沉积方法,在AAO模板孔道内制备Cu纳米线。采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射仪(XRD)对Cu纳米线的形貌、晶体结构进行研究。结果表明:模板的孔径均匀,孔道平直。Cu纳米线均匀分布在AAO模板纳米孔隙中,直径均一,并沿Cu(Ⅲ)晶面择优生长;AAO模板孔道生长铜纳米线不光滑,成凹凸状,并对此沉积机理进行探讨。     

CuS纳米线阵列的制备

将多孔阳极氧化铝模板(AAO)的电化学沉积技术与真空硫化技术相结合,在制备Cu纳米线的基础之上,制备得到了CuS纳米线阵列.采用扫描电子显微镜电镜和X射线衍射仪对二次氧化的AAO模板和所得Cu与CuS纳米线的形貌和结构进行了表征,结果表明所得CuS纳米线不仅具有良好的有序阵列,而且具有多晶结构.在硫化过程中,随着硫化温度的升高,CuS结晶程度增大,在500～550℃时,达到最大的结晶程度.     

聚苯乙烯一维纳米阵列的图案化

采用紫外线光刻技术在阳极氧化铝模板(AAO)上生成预设图案,用物理浸润的方法在图案化的模板上生长聚苯乙烯,最后用NaOH和磷铬酸溶液分别溶解模板.采用扫描电子显微镜(SEM)和电子能谱(EDS)分析.结果表明,制备的图案是直径5μm的圆形组成,圆形图案中心之间距离是10μm,每个圆中长满一维纳米阵列,其纳米特性没有变化.     

TiO2纳米线阵列生长机理的研究

采用两步氧化法制备了多孔氧化铝模板(AAO),并利用AAO结合用电化学诱导溶胶-凝胶法制备了锐钛矿型的TiO2纳米线阵列,探讨了形成TiO2纳米线阵列的生长机理.发现TiO2纳米线是由Au基底沿着孔洞逐步向上生长,直接生成纳米线,因而可以通过控制氧化铝模板的尺寸和电化学沉积的时间来控制纳米线的长径比.     

单晶铋纳米线阵列的可控生长

采用脉冲电化学沉积技术,利用同一直径的氧化铝模板,通过调节脉冲参数制备出了不同直径的单晶铋纳米线阵列,同时实现了纳米线取向的可控生长.保持脉冲弛豫时间不变,纳米线的直径随着脉冲沉积时间的增加而变大,纳米线的取向随着脉冲占空比的变化发生移动.     

非晶Co及CoP纳米阵列的制备及研究

采用交流电化学沉积法,在多孔阳极氧化铝(AAO)模板孔洞中成功制备出直径50nm的Co纳米线阵列.采用透射电子显微镜(TEM)和选区电子衍射(SAED)观察了样品的微观形貌结构.结果显示,阵列中纳米线均匀有序,形状各向异性较大,其晶体结构为非晶.在沉积Co纳米线阵列的电解液中添加一定的还原剂(NaH2PO2·H2O),制备出非晶CoP纳米阵列,由TEM观察可知,阵列形貌发生变化,沉积产物为离散的纳米粒子而非纳米线.探讨了交流电沉积纳米阵列的生长机理.     

简单蚀刻法制备具有可控高度的金属纳米线阵列

采用多孔阳极氧化铝(AAO)作为模板,运用电化学沉积法在模板的微孔中组装金属Ni纳米线,然后用磷铬酸蚀刻表层AAO模板,暴露出规整有序、具有可控长度的Ni纳米线阵列.分别用SEM、TEM与SAED对Ni纳米线阵列进行了表征.研究了蚀刻时间与AAO模板质量的减少及暴露出来的Ni纳米线阵列长度之间的关系.结果表明,磷铬酸是较NaOH溶液更为温和有效的AAO模板蚀刻剂,通过控制模板溶解时间,可以实现对裸露于AAO模板外纳米线长度的精细有效控制.该蚀刻方法普遍适用于以AAO为模板所制得的准一维纳米阵列结构.     

铜纳米线阵列显微结构的表征和控制

采用多孔氧化铝(AAO)模板脉冲电沉积法制备了强辐射源用铜纳米线阵列材料,并用扫描电子显微镜(SEM)、能谱(EDS)和X射线衍射(XRD)对其进行了结构袁征.结果表明电沉积的峰值电流强度和辅助阴极可以影响铜纳米线的表面质量、长度分布均匀性和微区长度起伏.减小峰值电流强度,可以明显改善单根铜纳米线的表面质量,但是对铜纳...     

Quantificational Etching of AAO Template

Ni nanowires were prepared by electrodeposition in porous anodized aluminum oxide （AAO） template from a composite electrolyte solution. Well-ordered Ni nanowire arrays with controllable length were then made by the partial removal of AAO using a mixture of phosphoric acid and chromic acid （6 wt pct H3PO4：1.8 wt pct H3CrO4）. The images of Ni nanowire arrays were studied by scanning electron microscopy （SEM） to determine the relationship between etching time and the length of Ni nanowire arrays. The results indicate that the length of nanowires exposed from the template can be accurately controlled by controlling etching time.     

Fabrication of highly-ordered nanopatterned copper nanowire arrays by photolithography

Two different patterns, one being circular and the other being QDU, of copper (Cu) nanowire arrays were successfully produced by electrochemical deposition and photolithography. The highly-ordered patterns of Cu nanowire arrays were observed to stand freely on the substrate using scanning electron microscopy (SEM). Chemical analyses have been performed on Cu nanowires using energy dispersive X-ray spectroscopy (EDS). The results confirmed that it is mainly composed of Cu. Selected-area electron diffraction (SAED) pattern indicated the nanowires are single crystalline and the growth direction of the nanowires is along the [220] direction. With the deposition time increasing, the length of Cu nanowires increaseed.     

Quantiflcational Etching of AAO Template

Ni nanowires were prepared by electrodeposition in porous anodized aluminum oxide (AAO) template from a composite electrolyte solution. Well-ordered Ni nanowire arrays with controllable length were then made by the partial removal of AAO using a mixture of phosphoric acid and chromic acid (6 wt pct H3PO4: 1.8 wt pct H3CrO4). The images of Ni nanowire arrays were studied by scanning electron microscopy (SEM) to determine the relationship between etching time and the length of Ni nanowire arrays. The results indicate that the length of nanowires exposed from the template can be accurately controlled by controlling etching time.     

Characterization of ordered Cu2O nanowire arrays prepared by heat treated Cu/PAM composite

Cu nanowire arrays were synthesized via a porous alumina membrane (PAM) template with a high aspect ratio, uniform pore size (120–140 nm), and ordered pore arrangement. The Cu₂O nanowire arrays were prepared from the oxidization of Cu metal nanowire arrays. The electrochemical deposition potential of Cu metal nanowires (?180 mV vs. SCE) was determined from X-ray diffraction (XRD) patterns. The microstructure and chemical composition of Cu nanowire arrays were characterized using field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), and X-ray diffraction (XRD). Results indicate that the Cu/Cu₂O nanowire arrays assembled into the nanochannel of the porous alumina template with diameters of 120–140 nm. The valence of copper was controlled by the porous alumina template during the annealing process. Copper nanowires transformed to the Cu₂O phase with the space limitation of the PAM template. Single-crystal Cu₂O nanowire arrays were also obtained under the template embedded.     

Effect of the Electrodeposition Frequency,Wave Form,and Thermal Annealing on Magnetic Properties of [Co0.975Cr0.025]0.99Cu0.01 Nanowire Arrays

Highly ordered [Co _0.975Cr _0.025]_0.99Cu _0.01 nanowire arrays were electrodeposited by conducting alternating current (AC) conditions from sulfate-based electrolyte into nanopores of anodic aluminum oxide (AAO) template with 37 nm pore diameter and the interpore distances of almost 50 nm. Fabricated nanowire arrays were characterized using scanning electron microscopy, alternating gradient force magnetometer, and X-ray diffraction. The results illustrated that varying frequency, wave form, and annealing procedure had influence on magnetic properties of as deposited nanowires. The nanowire arrays electrodeposited at different electrodeposition frequencies show remarkably different magnetic behaviors. Due to increasing of the electrodeposition frequency, the rate of ions for reduction was decreased. The nanowires prepared at various wave form illustrated insignificant impact on magnetic properties. X-ray diffraction patterns display that both as-deposited and annealed nanowire arrays expose the same structure. The raised value of coercivity has been determined in annealed nanowire arrays. Magnetization measurements show that the maximum value of coercivity for [Co _0.975]_0.99Cu _0.01 nanowires is observed at high temperature.     

模板法合成分叉Ni纳米线阵列及其磁性能

首先采用三次阳极氧化法制备了具有Y形孔道的氧化铝(AAO)模板,然后采用直流电化学沉积法,在模板内成功合成了分叉Ni纳米线的有序阵列.通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对所合成样品的晶体结构和形貌进行了表征测试.结果表明,制备的Ni纳米线分布均匀、排列有序,呈Y形分又结构,其...     

溶液浸润模板法制备图案化ABS纳米管阵列

采用紫外光刻技术首先制备了图案化的阳极氧化铝(AAO)模板,以此作为"二次模板",以不同浓度的ABS溶液浸润模板,成功地制备了不同结构的ABS纳米管阵列。用扫描电镜(SEM)对其微观形貌进行表征,结果显示,所获得的ABS纳米管阵列排列规整,高度有序,与掩膜的图案完全一致。并且讨论了溶液浓度对纳米管壁厚的影响。     

Magnetoimpedance Effect on Single NiFe Nanowire

In this study, Ni₈₂Fe₁₈ nanowires were deposited on Au-coated porous anodic alumina oxide (AAO) template by electrochemically. Scanning electron microscopy showed that wires have diameters of about 250–310 nm and length of 50–60 μm. NiFe nanowire arrays embedded in AAO were mechanically polished until nanowires appeared. Later, electrical contacts were made to a single nanowire using a focused ion beam (FIB) system. Magnetoimpedance (MI) properties of single nanowire were investigated, and nearly 3.5 % MI was observed at 4 GHz driving current frequency.     

Single-crystal silver nanowires: Preparation and Surface-enhanced Raman Scattering (SERS) property

Ordered Ag nanowire arrays with high aspect ratio and high density self-supporting Ag nanowire patterns were successfully prepared using potentiostatic electrodeposition within the confined nanochannels of a commercial porous anodic aluminium oxide (AAO) template. X-ray diffraction and selected area electron diffraction analysis show that the as-synthesized samples have preferred (220) orientation. Transmission electron microscopy and scanning electron microscopy investigation reveal that large-area and ordered Ag nanowire arrays with smooth surface and uniform diameter were synthesized. Surface-enhanced Raman Scattering (SERS) spectra show that the Ag nanowire arrays as substrates have high SERS activity.