表面具有孔洞的硫化铅微立方体的制备及表征

运用水热法再经过高温煅烧处理制备出了表面具有孔洞的硫化铅立方体.立方体的边长在10μm左右,表面孔洞的直径在1～2μm之间.考察了反应条件对产物的影响规律,结果表明反应时间对产物的形貌有着重大的影响,随着反应时间的增加,PbS晶体由完整的微立方体逐步转变为表面具有孔洞的立方体结构,同时体系中葡萄糖的存在对于这种新颖结构的形成也起到了至关重要的作用,运用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电镜(HRTEM)、电子衍射(ED)等对所得产物进行了系统的表征.并对其生长机理进行了初步的探讨.     

四方相BaTiO3薄膜的自组装制备与表征

以(NH₄)₂TiF₆、 Ba(NO₃)₂ 和H₃BO₃为主要原料, 采用自组装单层膜(SAMs)技术, 以三氯十八烷基硅烷(octadecyl-trichloro-silane, OTS)为模版, 在玻璃基片上制备了四方相钛酸钡晶态薄膜. 改性基板的亲水性测定与原子力显微镜（AFM）测试表明, 紫外光照射使基板由疏水转变为亲水, 能够对OTS-SAM起到修饰作用. 金相显微镜观察结果显示,OTS单分子膜指导沉积的薄膜样品表面均匀, 表明OTS SAM对钛酸钡薄膜的沉积具有诱导作用; X射线衍射（XRD）与扫描电镜（SEM）表征显示, 空气中600℃下保温2h实现了薄膜由非晶态向四方相BaTiO₃晶态薄膜的转化过程, 制备的钛酸钡薄膜在基板表面呈纳米线状生长, 线长约在500～1000nm之间, 相互连接的晶粒大小约为100nm. 文章同时对自组装单层膜和钛酸钡薄膜的形成机理进行了探讨.     

表面化学沉积法制备SiO2空心微球

研究了以聚苯乙烯(PS)微球为模板,采用表面化学沉积技术制备SiO2@PS微球的工艺.利用ξ电位及FT-IR吸收光谱分析了硅烷偶联剂(MPS)及引发剂(KPS)对PS微球表面电荷及表面官能目的影响,在PS微球表面官能化过程中加入KPS,促进PS微球与MPS聚合,增加了微球表面Si-OH的浓度,实现TEOS在PS微球表面的均匀包裹,制得了单分散的核壳结构的SiO2@PS微球.通过调整TEOS的加入量,可得到壁厚在20～55nm的SiO2空心球.     

基于非硅微加工技术的超疏水表面的设计和制造

利用非硅微加工技术,在金属基底表面构建了由圆柱状金属镍组成的规则的微阵列结构,研究了微阵列的疏水性.利用正己烷溶解十八烷基三氯硅烷(OTS)配制成涂覆液,对微阵列进行低表面能物质涂覆.通过对比涂覆前后的静态超疏水性,研究了低表面能物质涂覆的作用.实验发现圆柱高度为5～30μm、直径为30～50μm、间距为15～50μm的微结构阵列在不涂覆OTS的前提下表现出了稳定的超疏水性.涂覆OTS虽然没有增加阵列结构的接触角,但是改善了微阵列在水流冲击下的疏水性.     

空心玻璃微球镍镀层的制备及其电磁性能

采用化学镀技术在低密度玻璃微球表面沉积了一层Ni镀层,制备了具有导电性和磁性的Ni镀层/玻璃微球壳-核复合粉体.采用X射线衍射仪(XRD)、扫描电镜(SEM)和能谱仪(EDS)对化学镀前后玻璃微球的结构、表面形貌以及成分进行了分析.结果表明,化学镀后玻璃微球表面包覆了一层均匀致密的Ni薄膜,厚度约为0.2μm,镍具有面心立方结构.使用波导法在8～12GHz波段内对化学镀前后的微球进行了介电常数和磁导率测试.电磁性能研究表明,玻璃微球化学镀镍后电磁损耗增大,显示出作为电磁波吸收材料的应用前景.     

BiFeO_3薄膜的液相自组装制备与表征

利用自组装单层膜技术,以三氯十八烷基硅烷(OTS)为模板,以硝酸铋和硝酸铁为原料,柠檬酸为络合剂,在玻璃基片上制备了铁酸铋晶态薄膜.探讨了薄膜的煅烧温度和沉积温度对BiFeO3薄膜的影响.通过X射线衍射(XRD)、扫描电镜(SEM)及原子力显微镜(AFM)测试手段对BiFeO3薄膜的物相组成、显微结构和表面形貌进行了表征,EDS能谱测试为铁酸铋薄膜的化学组成提供了有力的证据.结果表明:利用自组装技术在600℃热处理后成功制备出了纯净的BiFeO3晶态薄膜,当沉积温度为70～80℃时铁酸铋薄膜结晶良好,样品表面均匀、致密.     

微图案BiFeO_3薄膜的光刻自组装制备与表征(英文)

利用光刻自组装技术在玻璃基板上成功制备出图案化的BiFeO3薄膜.AFM和接触角测试表明,紫外光照射引起十八烷基三氯硅烷(OTS)单层膜改性,形成憎水的自组装单分子(SAM)区域和亲水的硅烷醇区域;XRD和XPS结果显示,OTS单层膜和紫外照射处理的玻璃基板表面诱导吸附的薄膜为纯相六方扭曲钙钛矿结构的BiFeO3薄膜;SEM和EDS表明,SAM区域沉积的BiFeO3薄膜不连续,在超声波震荡下容易脱落,而硅烷醇区域沉积的BiFeO3薄膜致密均一,与基底结合牢固,边缘轮廓清晰.     

纤维素/木质素微球抗紫外薄膜制备与性能研究

随着包装工业的快速发展和人类社会对环保要求的提高,功能性且可生物降解的包装膜材料越来越受到人们的重视.然而,目前市场上的可降解包装膜材料由于成本较高、力学性能差以及耐水性低而限制了其发展.采用自组装方法制备木质素微球,并将其沉积在纤维素膜表面,制备出一种新型纤维素基抗紫外薄膜材料.通过扫描电子显微镜(SEM)、红外光谱(FTIR)和激光共聚焦电子显微镜对薄膜的表面性能进行研究.利用抗张实验和紫外透光率测试对纤维素基功能薄膜的力学性能和抗紫外性能进行表征.结果表明:自沉积木质素微球在纤维素膜表面分布均匀,尺寸为1～2μm;纤维素薄膜疏水改性后有助于木质素微球的沉积,且沉积量随着木质素质量浓度的增加而增大.由于木质素微球的引入,纤维素复合膜的抗张强度比对照样增加22％,同时其对UVB屏蔽效果可达94％.     

纳米氧化亚镍/玻璃微球复合粒子的制备及表征

通过均匀沉淀法,将NiO 复合于玻璃微球表面,制备了纳米NiO/玻璃微球复合粒子。X射线衍射(XRD)、扫描电镜(SEM) 结果表明,经过共沉积后,在玻璃微球表面生成一层具有面心结构的NiO 层,晶粒尺寸大约为14 nm,这些纳米NiO粒子以丝状胶连的形式附着于玻璃微球表面形成镀层。能谱分析(EDS) 结果显示,纳米NiO粒子在玻璃微球表面形成了分布均匀的镀层。傅立叶变换红外光谱仪(FTIR) 表明,所制得的纳米NiO/玻璃微球复合粒子在近红外和远红外波段都表现出良好的红外吸收特性。      

液相自组装制备钛酸铋功能陶瓷薄膜的工艺研究

以硝酸铋和氟钛酸铵为原料,以三氯十八烷基硅烷(OTS)为模板,利用自组装单层膜(SAM)技术,在玻璃基片上制备钛酸铋薄膜.改性基板的亲水性测定与原子力显微镜(AFM)测试表明,紫外光照射使基板由疏水转变为亲水,能够对OTS-SAM起到修饰作用.借助XRD,SEM测试手段分析了前驱液的pH值、沉积条件和煅烧温度对Bi4 ...     

Co-patterning chitosan and bovine serum albumin on an aldehyde-enriched glass substrate by microcontact printing

Chitosan and bovine serum albumin were co-patterned onto a glass substrate by microcontact printing technique. The process uses a microfabricated polydimethylsiloxane stamp to transfer chitosan on an aldehyde functionalized glass substrate, followed by adding a drop of albumin solution to the patterned side and holding for 30 min. After being washed with phosphate-buffered saline and cleaned by ultrasonic, the co-patterns of chitosan and albumin, each with their own micropatterns, were formed on the same surface. In this procedure, ultrasonic cleaning takes an important role to obtain clear patterns, whereas the printing/adding sequence has less influence. Moreover, patterns printed could give higher contrast than those assembled from solution. These co-patterns could find applications in cell localization and cell growth guidance.     

Biomimetic micropatterning of silica by surface-initiated polymerization and microcontact printing

Micropatterns of silica on a gold substrate were generated by a biomimetic approach, namely, the biosilicification of silicic acids. The procedure consists of three simple steps: pattern generation of a polymerization initiator, (BrC(CH(3))(2)COO(CH(2))(11)S)(2), by microcontact printing; surface-initiated, atom-transfer radical polymerization of 2-(dimethylamino)ethyl methacrylate (DMAEMA) from the patterned area; and polycondensation of silicic acids. The tertiary amine-containing polymer, pDMAEMA, aided in the spatially controlled polycondensation of silicic acids on surfaces in the presence of phosphate ions, and micropatterns of silica on a gold substrate were successfully generated in combination with the technique of microcontact printing. The procedure could be extended to the controlled fabrication of silica patterns with any size, shape, or thickness.     

Microcontact printing and selective surface dewetting for large area electronic applications

A universal microstructuring approach was developed, which facilitates the patterning of surfaces by a combination of microcontact printing (mCP) and selective surface dewetting/wetting. Self-assembled monolayers (SAMs) were patterned on glass or silicon substrates by μCP. The regions coated by the SAMs turn hydrophobic, whereas the uncoated regions stay hydrophilic. Such functionalized surfaces facilitate selective deposition of polymers or resists. Polymethyl methacrylate and prepolymer polyurethane were selectively deposited on the hydrophilic regions of the substrate. The hydrophobic regions of the substrate stay uncoated. Subsequently, the resist was used to lift-off metallic microstructures in order to realize micro coils and electrodes for radio frequency information tags. The printed electrodes were used to define drain and source contacts of organic thin film transistors. The device characteristic of the organic transistors will be presented.     

Ordered nanostructure of PS-b-PEO copolymer by solvent annealing with mixture of benzene/water vapor and its micropattern fabrication

We investigate the effect of water/benzene co-solvent vapor on the ordering of poly(styrene-b-ethylene oxide) (PS-b-PEO) copolymer thin film on silicon substrate upon solvent annealing. In-plane cylindrical PEO microdomains were observed after exposure of benzene vapor. The addition of water vapor dominantly produced the cylindrical PEO domains aligned perpendicular to the substrate. The best ordering of the cylinders was obtained at the water fraction of approximately 0.05. The degree of ordering decreases while the periodicity of haxagonally packed PEO cylinders increases with the amount of water in the vapor mixture. The average center-to-center distance of hexagonally packed cylindrical PEO microdomains increases with the water fraction from approximately 25 nm to 40 nm. As one way of utilizing the dewetting of thin films inevitable during solvent annealing, PS-b-PEO micropatterns prepared by microcontact printing were treated with co-solvent vapor, which allows us to fabricate the controlled dewet structures guided by the micropatterns. Cylinder-to-sphere phase transition of PEO microdomains also occurred upon solvent annealing in the micropatterned PS-b-PEO films.     

(Bio)functional surface structural design of substrate materials based on self-assembled monolayers from aminocellulose derivatives and amino(organo)polysiloxanes

Practical procedures according to the self-assembling principle are used to modify a number of substrate materials such as glass, silicon, gold, metals/oxides, polymers (e.g. polystyrene), implant materials (polydimethylsiloxane, polyhydroxyethylmethacrylate, polymethylacrylate, poly-l-lactate) for a wide range of (bio)functional applications based on self-assembled monolayers of structural-designed derivatives of a novel aminocellulose type with varying (bio)functional surface properties and special amino(organo)polysiloxanes.By microcontact printing, lateral structural patterns are stamped onto the substrate material surfaces in the form of monolayer composites of aminocellulose chains and amino(organo)polysiloxanes.     

构筑生物分子微图案的研究进展

随着微加工技术的发展,在材料表面构筑功能化的纳微米级图案越来越成为关注的热点。在生物科学领域,光刻蚀、微接触印刷和蘸笔纳米平板印刷等微图案技术被广泛应用并实现了生物分子在几十纳米微区域上的固定。生物分子在微纳米区域内的成功固定大大推动了生物微分析、生物芯片、生物微器件等生物技术及相关领域的发展。本文从分析生物分子与材料表面的相互作用入手,较为系统地评述了构筑生物分子微图案的几种重要方法,并对生物分子微图案技术的发展做了展望。     

Fabrication of a carbon-nanotube-based field-effect transistor by microcontact printing

The fabrication of a field-effect transistor with both channel material and source and drain electrodes made from carbon nanotubes (CNTs) through patterned deposition of CNT films by microcontact printing is described. Surfactant-dispersed single-walled CNTs are first separated into semiconducting and metallic fractions by gel filtration. The semiconducting and metallic CNTs are then sequentially transferred by dendrimer-coated polydimethylsiloxane stamps onto dendrimer-coated silicon wafers following a printing protocol optimized for this purpose. The resulting CNT micropatterns are visualized by atomic force microscopy. Semiconducting as well as metallic CNTs preserve their characteristic electronic properties within the transferred films. A device composed of a rather thick (ca. 5 nm) and densely patterned film of metallic CNTs cross-printed on top of a thinner (ca. 1.5 nm) and less dense film of semiconducting CNTs shows the typical properties of a field-effect transistor with the metallic CNT stripes as electrodes, the semiconductive CNT stripes as channel material, and the silicon substrate as gate electrode.     

Local modification of self-assembled monolayers by a photocatalytic probe

We demonstrate a novel nanolithography method based on the photocatalytic decomposition of the self-assembled monolayer (SAM) near a TiO2-coated probe. The TiO2 film was deposited on Ti-Pt coated Si probes by plasma sputtering. After annealing at 500 degrees C in air for 2 hr, the film was in the anatase phase, according to examination by Raman and X-ray diffraction spectra. Island-structured octadecyltrichlorosilane (OTS) partial monolayers on glass were used as the substrates. When the photocatalytic probe was illuminated by ultra-violet light, the modification occurred on the near OTS SAM islands. No change was observed on the exposed oxide surface between OTS islands. Without UV illumination, no modification occurred on OTS. Thus, the modification of the OTS surface is related to the photocatalytic reaction. A line width as small as 60 nm was achieved and observed by lateral force microscopy (LFM). The diffusion of reactive oxygen species were also observed from the remote photodecomposition of the OTS monolayer. These results should be beneficial to the development of hierarchically constructed nanolithography.     

玻璃基底上的蛋白质微接触压印图型化

研究了一种将胶原Ⅰ型蛋白通过微接触压印技术图型化于玻璃基底表面的方法.采用标准光刻工艺制备印章母版,并运用反应离子刻蚀设备对印章表面进行氧等离子体处理,以期改善印章表面亲水性能.将涂敷了胶原Ⅰ型蛋白,并经返潮处理的印章以50 g/cm^2大小的力与玻璃表面接触10 s,得到蛋白质微图型.结果表明,采用反应离子刻蚀技术能显著改善聚二甲基硅氧烷（PDMS）印章表面的亲水性.表面亲水性得到改善的PDMS印章,在经过湿盒返潮后,再进行微接触压印得到的蛋白质微图型其质量得到显著提高.     

Patterning Hydrophobic Surfaces by Negative Microcontact Printing and Its Applications

Here, a negative microcontact printing method is developed to form hydrophilic polydopamine (PDA) patterns with micrometer resolution on hydrophobic including perfluorinated surfaces. In the process of the negative microcontact printing, a uniform PDA thin film is first formed on the hydrophobic surface. An activated polydimethylsiloxane (PDMS) stamp is then placed in contact with the PDA‐coated hydrophobic surface. Taking advantage of the difference in the surface energy between the hydrophobic surface and the stamp, PDA is removed from the contact area after the stamp release. As a result, a PDA pattern complementary to the stamp is obtained on the hydrophobic surface. By using the negative microcontact printing, arrays of liquid droplets and single cells are reliably formed on perfluorinated surfaces. Microlens array with tunable focal length for imaging studies is further created based on the droplet array. The negative microcontact printing method is expected to be widely applicable in high‐throughput chemical and biological screening and analysis.