模板浸润法制备聚苯乙烯纳米管阵列

采用一种简单的物理技术——聚合物溶液或熔体浸润多孔阳极氧化铝(AAO)模板的方法,在孔径仅为200nm的AAO模板中制备聚苯乙烯(PS)纳米管阵列。SEM和TEM测试结果表明：熔体法制备的纳米管壁厚约为110nm;5．0wt％和10．0wt％的PS溶液制备的纳米管壁厚分别为70nm和80nm。并初步探索了模板法制备聚合物纳米管的多次浸润机理。     

模板浸润法制备可生物降解聚合物纳米管和纳米线

以孔径为200nm的阳极氧化铝（AAO）为模板，用简单的物理方法制备了生物可降解聚合物聚己内酯（PCL）的纳米管、线及其阵列结构。SEM和TEM测试结果表明：熔融法在120℃和140℃都能制得整齐的纳米管阵列结构，管径均匀，约300nm。在溶液法中，5％浓度的溶液制得了杂乱的纳米管，而10％浓度的溶液制得的是纳米线阵列，直径在200nm左右。     

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。     

溶液浸润法制备PS纳米管及其形成机理的初探

首次以孔径仅有200nm的阳极氧化铝(AAO)为模板，采用聚合物溶液浸润模板的物理技术，通过不同方法成功制备了常规分子量的PS纳米管及其阵列结构。SEM和TEM测试结果表明，有效地调整和控制制备方法和工艺，可制备出不同管壁厚度的聚合物纳米管．也可制备出管壁带有多孔的纳米管，还可制备出纳米线。探索了多孔模板法制备聚合物纳米管的机理。     

多孔模板法制备热塑性聚氨酯(TPU)纳米管

采用聚合物溶液和熔体浸润多孔阳极氧化铝（AAO）模板的物理方法,成功制备了通孔的热塑性聚氨酯（TPU）纳米管及其阵列结构．扫描电子显微镜（SEM）和透射电子显微镜（1EM）测试表明：有效地调整溶液滴加量可制备出不同结构的聚合物纳米管阵列．以浓度为7．0％（wt）TPU溶液为例,研究了溶液滴加量对纳米管结构之间的关系,2μL为制得TPU纳米管阵列结构的最佳滴加量．并探索首次浸润程度对纳米管结构的影响,完善了模板浸润法的多次浸润机理．     

模板法制备DyCoxZnyOz纳米管阵列及磁性研究

采用减压抽滤法在多孔阳极氧化铝模板（AAM）纳米孔道中构筑DyCo_xZn_yO_z纳米管阵列,采用扫描电镜（SEM）和透射电镜（TEM）观察DyCo_xZn_yO_z纳米管阵列和单根纳米管形貌,用选区电子衍射（SAED）、X-射线衍射（XRD）及能量色散谱（EDS）表征纳米管的结构和元素组成,结果表明,DyCoxZnyOz纳米管为非晶态结构,纳米管元素组成的原子百分比Dy：Co：Zn：O为4.86：1.67：1.70：91.77,质量百分比Dy：Co：Zn：O为32：4.42：4.07：59.51。以振动样品磁强计（VSM）研究了DyCo_xZn_yO_z纳米管阵列磁性能,实验结果表明,DyCo_xZn_yO_z纳米管阵列易磁化方向为垂直于纳米管阵列方向,磁各向异性源于形状各向异性,DyCo_xZn_yO_z纳米管阵列具备软磁体特征。     

紫外光刻法制备图案化聚合物纳米管/线阵列的研究

探讨了紫外光刻技术制备图案化聚合物纳米管/线阵列的方法,研究制备过程中的各种影响因素,并找到了最佳的实验条件。采用溶液浸润法,成功制备了不同图案的聚合物纳米结构阵列。溶液浓度为6%(质量分数),得到的是聚合物纳米管阵列;溶液浓度为10.0%(质量分数),得到的是聚合物纳米线阵列。     

用AAO模板法制备硅纳米管

先用二步阳极氧化法制备纳米孔平均孔径约为100 nm的Al/Al_2O_3(AAO)模板,再以AAO为模板用溶胶-凝胶法合成管径约为60-80 nm的硅纳米管,并用扫描电镜和透射电镜观察了硅纳米管的形貌。结果表明,AAO模板的孔径分别随着二步阳极氧化法中电解温度、氧化电压、硫酸和草酸混酸浓度的增大而增大,硅纳米管的形成与硅烷溶胶的嵌入方法、凝胶形成时间和温度有较大的关系。     

Ni纳米管的电化学模板法制备及表征

本文采用一种简单而有效的电化学方法在硫酸铵体系中利用氧化铝模板(AAO)成功制备出规则有序的Ni的管状纳米阵列.使用这种方法可获得外径约为70nm,内径约为50nm的Ni纳米管.对所得的Ni纳米管进行了扫描电镜(SEM)、透射电镜(TEM)、选区电子衍射图(SAED)和X射线衍射(XRD)分析,结果表明:该方法制备的Ni纳米管高度有序,大小均一,其形貌受控于氧化铝模板的结构,外径与模板的孔径相等.     

软模板法制备SiO2纳米管

本文报道了以酒石酸为模板剂,正硅酸乙酯（TEOS）为硅源,乙醇为共溶剂,在氨水存在的条件下合成SiO2纳米管的方法和结果。讨论了氨水浓度对SiO2纳米管的形态和生长的影响。实验发现,氨水浓度对SiO2纳米管的形态及生长起着至关重要的作用。在一定的浓度范围内,随着氨水浓度的减小,产物中SiO2纳米管的数量和长径比都增加。并首次讨论了氨水浓度和酒石酸对SiO2纳米管形成过程的作用机理。     

Preparation, characterization and formation mechanism of thermoplastic polyurethane nanostructures using solution wetting template

Template wetting with polymer solutions has not been well understood up to now, and the formation mechanism of polymer nanostructures with this method is still to be revealed. In the present work, thermoplastic polyurethane (TPU) nanostructures were prepared by wetting cylindrical nanopores in an anodic aluminum oxide (AAO) membrane with TPU solution in dimethylformamide (DMF) followed by solvent evaporation. Both tubular structures and solid structures were simultaneously observed at four different concentrations of TPU solutions (i.e., 5, 7, 10, and 15 wt%) by a scanning electron microscope (SEM) and a transmission electron microscope (TEM). Furthermore, a transition from a tubular structure to a solid structure was also found at a higher concentration of TPU solution (15 wt%). It is speculated that the top part of the single nanostructure is tubular, and the lower part is solid. A "capillary wetting-evaporation-deposition" mechanism is given to explain such a phenomenon. According to this mechanism, the higher polymer concentration, the larger amount of solution, and the smaller pore size are believed to be beneficial for the formation of solid structures.     

Preparation of mesoporous carbon-carbon nanotube composites using the template method

Reported herein is a simple template method for preparing mesoporous carbons (MPCs) from a mesophase pitch, using homemade nano-sized MgOs and MgO-carbon nanotube (CNT) composites as templates. Nano-sized MgO particles containing iron-molybdenum were synthesized through the heat treatment of the precursor ash, and the MgO-CNT composites were prepared via catalytic chemical vapor deposition of CH4 over the MgO-based particles. MPCs with a high surface area of 443-578 m2/g were obtained through the heat treatment of well-mixed mesophase pitch-MgO (or MgO-CNT), followed by mild-acid treatment to remove the MgO and other catalyst components. All the materials (the precursors, nano-particles, and MPCs) were analyzed via powder X-ray diffraction, N2 adsorption-desorption isotherms, scanning electron microscopy, and high resolution transmission electron microscopy. The formation of the pore structure in the MPCs is discussed, and the potential application of the MPC-CNT composite is demonstrated through cyclic voltammetry.     

树状取向碳纳米管阵列的制备

采用在Ar气氛保护下裂解FePc制备出一种树状取向碳纳米管阵列(ACNTA),这种种特殊结构是由ACNTA裂缝自组装而成.在生长过程中裂缝处能获得更多的催化剂和碳源,因此自身能够持续发展,且裂缝以60°或120°夹角再次分裂,最终形成树状结构.     

Electrochemical synthesis using a self-assembled Au nanoparticle template of dendritic films with unusual wetting properties

This report describes the electrochemical preparation of dendritic silver films with unusual wetting properties coming from the use of a self-assembled gold nanoparticle (Au NP) template. It shows that the Au NP self-assembled monolayer on the highly ordered pyrolytic graphite (HOPG) surface is responsible for the formation of the dendritic morphology, which is not observed for the same deposition conditions on a bare HOPG substrate. An interesting evolution of the wetting properties of these films during the electrodeposition process is observed. Field emission scanning electron microscopy (FEGSEM), energy-dispersive spectrometry (EDS), x-ray photoelectron spectroscopy (XPS) and contact angle measurements are used to reveal the dendritic structure of the deposited silver film at a later stage of the electrodeposition process. They also reveal surprising wetting properties in terms of hydrophobic surface.     

无基底透明二氧化钛纳米管阵列薄膜的制备

在由乙二醇、水,氟化铵组成的电解液中添加钼酸钠调节阳极附近的离子浓度,制备出厚度大约为10微米的透明二氧化钛纳米管阵列薄膜.所得二氧化钛是无定型结构,在120℃水热处理可以将其转化成锐钛矿结构,并保持薄膜的结构完整性.该薄膜的透射率与其表面结构和晶体结构有关.这种透明二氧化钛纳米管阵列薄膜可望应用于染料敏化太阳能电池.     

Characterization of conjugated polymer/anodic aluminum oxide nanocomposites fabricated via template wetting

Solution-based template wetting is demonstrated as an effective means of producing semiconductor–insulator nanocomposites. The properties of such nanocomposites formed by incorporating two commonly investigated semiconducting polymers, poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene (MEH-PPV) and poly(3-hexylthiophene-2,5-diyl) (P3HT), along with their blend, into nanoporous aluminum oxide (AAO) are investigated electronically and spectroscopically. Significant improvement in hole mobility of amorphous MEH-PPV in a nanocomposite with AAO while such improvement is absent when the crystalline P3HT is utilized to fabricate the AAO nanocomposites. Spectral evidence indicates that increased molecular order is responsible for this observation. Carrier mobility intermediate to the homopolymer nanocomposites was observed in composites fabricated from an MEH-PPV:P3HT blend and an AAO membrane. Spectral evidence indicates that these two polymers phase segregate in the composite.     

Modeling the elastic properties of carbon nanotube array/polymer composites

In this work, the elastic properties of single-walled carbon nanotube (SWNT) arrays and their composites are investigated. The properties of twisted SWNT nano-arrays or ropes of circular cross-section are predicted through a finite element analysis by applying proper boundary conditions to the model and using the strain energy method. The nano-array properties are then used to describe the properties of twisted SWNT nano-array/polymer composites. The effect of volume fraction and aspect ratio of the nano-array as reinforcement for dilute polymer composite systems are examined for aligned and random reinforcement distribution using conventional micromechanics. Finally, elastic properties of the twisted SWNT nano-array/polymer composites are compared to the results from constitutive model of individual nanotube-reinforced polymer composites.     

Neural stimulation with a carbon nanotube microelectrode array

We present a novel prototype neural interface using vertically aligned multiwalled carbon nanotube (CNT) pillars as microelectrodes. Functionalized hydrophilic CNT microelectrodes offer a high charge injection limit (1-1.6 mC/cm2) without faradic reactions. The first repeated in vitro stimulation of hippocampal neurons with CNT electrodes is demonstrated. These results suggest that CNTs are capable of providing far safer and more efficacious solutions for neural prostheses than previous metal electrode approaches.