微图案化钙磷盐膜层的电化学构筑及其生物性能

基于表面分子自组装和光催化转印技术,在TiO2膜层表面获得超亲/超疏水阵列微图案模板,结合电化学沉积技术,成功制备了微图案化钙磷盐膜(CaP)层.扫描电子显微镜(SEM)和电子探针分析(EPMA)结果表明,通过超亲/超疏水阵列微图案模板可构筑高空间分辨的微图案化钙磷盐膜层.微图案化钙磷盐膜层的体外MG-63细胞培养证实,细胞对钙磷盐膜层微单元有强烈的选择性粘附作用,从而可望控制细胞在微单元中的贴壁生长,实现高通量评价细胞行为.     

具有超疏水性质的图案化Ag膜

以重氮树脂(DR)/聚丙烯酸(PAA)自组装膜的微图案作为模板, 通过DNA和聚二甲基二烯丙基氯化铵(PDDA)在模板上的层层沉积制备了图案化的DNA膜. 再在其中进行Ag的化学沉积得到图案化的Ag膜. 最后利用低表面能的十二烷基硫醇对Ag膜进行表面修饰, 制备了具有超疏水性质的图案化Ag膜. 其静态接触角达到约168°.     

自组装制备二氧化铪图案化薄膜

采用短波紫外光(UV)在十八烷基三氯硅烷(OTS)自组装单分子层刻蚀不同的微型图案,利用液相自组装技术在OTS模板表面沉积HfO₂图案化薄膜。通过XRD、AFM、SEM、EDS等测试手段对OTS膜和HfO₂薄膜进行表征,结果表明：以OTS为模板利用液相自组装技术成功制备出边缘轮廓清晰、粗糙度较小、条纹宽度为10μm的立方晶型的HfO₂图案化薄膜。     

软刻蚀及其应用

软刻蚀是一类基于自组装和复制模塑等原理的非光刻微米和纳米加工方法。它为形成和制作微米、纳米图案提供了简便、有效、价廉的途径。在软刻蚀中，用一个表面带图案的弹性模板来实现图案的转移，其加工的分辨率可达30nm－100μm。软刻蚀是微接触印刷、复制模塑、转移微模塑、毛细微模塑、溶剂辅助微模塑等的总称。本文将简介软刻蚀的原理、方法以及它们在微米和纳米加工、微电子学、材料科学、光学、微电子机械系统、表面化学等方面的应用。     

三维有序多孔图案化SiC陶瓷的制备

结合毛细管微模塑技术、模板技术和先驱体转化技术, 以图案化聚二甲基硅氧烷(PDMS)弹性体为模具,以氧化硅凝胶小球为模板, 以液态聚碳硅烷(PCS)为先驱体, 经过氧化硅凝胶小球图案化模板的形成, 先驱体的渗入, 模板中先驱体的交联, 弹性模具的去除, 图案化先驱体的无机化和模板的去除, 制备了图案化多孔SiC 陶瓷.研究结果表明：所制备的图案化多孔陶瓷中, 图案的尺寸受图案化PDMS 弹性模具的控制, 球形孔的孔径可由氧化硅凝胶小球来调节. 图案化陶瓷中球形孔不仅三维有序排列, 而且由于模板中小球的相互接触形成的“窗 口”使球形孔三维贯通.     

水溶液法制备图案化TiO2薄膜

从硫酸钛Ti(SO4)2的水溶液出发, 采用化学浴沉积和电沉积法来制备图案化TiO2薄膜. 通过硫酸和双氧水来稳定Ti4+, 配制了pH=1.0的硫酸钛溶液和pH=1.6的过氧硫酸钛溶液. 结合微接触印刷术在硅基底上制得自组装膜预图案, 再化学浴沉积TiO2即可得规则图纹. 无机配体对钛溶液的稳定性和TiO2的晶型均有影响, 溶液的酸度关系到所得图案的质量. 过氧硫酸钛溶液同样适用于电沉积, 在导电玻璃基底上旋涂光刻胶后选择性曝光、显影, 通过控制阴极电位可获得高差达200 nm的清晰图案.     

蜂窝状有序膜功能化研究进展*

水滴模板法是近年来引人瞩目的一种制备有序微结构材料的方法,所制备的蜂窝状有序膜在微容器和微反应器、图案化模板、细胞培养支架、光学材料、超疏水表面、分离膜等领域具有十分重要的应用前景。本文对蜂窝状有序膜功能化研究的最新进展进行了系统总结,详细介绍和分析了原位多层次自组装、表面接枝、生物活性分子固定、交联、模板法成膜以及表面填充等蜂窝状有序膜的功能化方法。     

水溶液法制备图案化TiO_2薄膜

从硫酸钛Ti(SO4)2的水溶液出发,采用化学浴沉积和电沉积法来制备图案化TiO2薄膜.通过硫酸和双氧水来稳定Ti4+,配制了pH=1.0的硫酸钛溶液和pH=1.6的过氧硫酸钛溶液.结合微接触印刷术在硅基底上制得自组装膜预图案,再化学浴沉积TiO2即可得规则图纹.无机配体对钛溶液的稳定性和TiO2的晶型均有影响,溶液的酸度关系到所得图案的质量.过氧硫酸钛溶液同样适用于电沉积,在导电玻璃基底上旋涂光刻胶后选择性曝光、显影,通过控制阴极电位可获得高差达200nm的清晰图案.     

TiO2颗粒在羟基表面的沉积行为及图案化

比较了3种具有羟基表面SiO2层的差异:紫外光照SAMs形成的羟基表面,紫外光照射前、照射后的羟基表面;用光照前后表面的差异,结合化学浴沉积技术在单晶硅基底上制得了TiO2微图案薄膜。系统考察了光源、硅片表面性质的变化、溶液等方面对图案生成的影响。实验表明TiO2沉积在未照区,电子和空穴动力学上的差异造成光照区表面正电荷增多,抑制了TiO2的沉积。该方法不需要光刻胶和自组装膜作为辅助模板,具有简单廉价的特点。     

图案化自组装膜导向的电沉积

通过图案化自组装膜导向的电沉积制备了聚吡咯(PPy)微结构. 由微接触印刷方法制备图案化自组装膜并作为电沉积的模板. 研究发现, 自组装膜在导向电沉积中在不同的基底上具有不同的作用: 在十二烷基硫醇(DDT)、十八烷基硫醇(ODT)修饰的金基底上和十八烷基三氯硅烷(OTS)修饰的铟锡氧化物玻璃上(ITO), 电沉积主要发生在自组装膜未修饰区, 而在半导体单晶硅表面, PPy沉积在OTS修饰区, 是基底表面的导电性及PPy与基底表面基团相容性共同作用的结果.     

SiO2 nanowires growing on hexagonally arranged circular patterns surrounded by TiO2 films

An effective approach has been demonstrated for the synthesis of novel composite architectures, SiO2 nanowires (NWs) growing on hexagonally arranged circular patterns surrounded by TiO2 films on Si substrate. First, a solution-dipping template strategy is used to create TiO2 films with hexagonally arranged pores on Au-coated Si substrate, resulting in hexagonally arranged circular patterns of catalysts surrounded by TiO2 films. Then the patterned catalysts guide the growth of SiO2 NWs with the original TiO2 films preserved, realizing the composite structures. Such composite architectures combine the photoluminescence (PL) properties of the two components, and also present more favorable PL property, laying a foundation for future advanced nano-optoelectronic devices.     

TiO2微图纹结构的制作

The representative soft lithographic techniques are used,which are micromolding and microtransfer molding methods to fabricate the micro array patterned titanium dioxide on glass substrates. Firstly titanium dioxide sol was synthesized by sol-gel method using tetrabutyl titanate as the precursor,then the pre-patterned poly（dimethylsiloxane） elastomeric stamp was used to mold the TiO2 sol on glass substrate by micromolding and microtransfer molding methods,micro patterned TiO2 sol was gelled at 70℃ with 0. 5 N pressure applied on the PDMS stamp,further heat treatment of TiO2 gel by annealing at 550℃ for 2 h produced the TiO2 microstructure. The TiO2 microstructure was observed by the optical microscope and the optical micrographs demonstrated the satisfactory yield and fidelity of pattern transfer by micromolding method and microtransfer method. The effect of gel temperature,the pressure applied on the PDMS stamp and the silicone mold on the fidelity and yield of TiO2 microstructure are discussed.     

Positive and negative TiO2 micropatterns on organic polymer substrates

Ordered titanium dioxide (TiO2) films have received increasing attention because of their great potential in photocatalysis, energy conversion, and electrooptical techniques. Such films are often fabricated as coatings on various substrates such as silicon or a variety of polymers. Liquid-phase deposition (LPD) of TiO2 films is especially promising for organic substrates due to its very mild reaction conditions. In the present paper, LPD is conducted on a wettability-patterned polypropylene surface to fabricate positive and negative TiO2 micropatterns. A thin layer of ammonium persulfate in an aqueous solution was sandwiched between two biaxially oriented polypropylene (BOPP) films, and a photomask was employed to control the irradiation region. Within a short time interval, a high hydrophilicity could be obtained on the irradiation region, and an effective wettability contrast between the irradiated and unirradiated regions could be created to further induce the formation of two types of TiO2 micropatterns. Up until now, most approaches for micropatterning have been based on self-assembled monolayers on surfaces of gold (or other noble metals), silicon, and various polyesters. With the present method, however, there is no longer any limitation in the type of substrate used. Our work demonstrates that an anatase TiO2 film could be selectively deposited on a hydrophilic region, giving rise to a positive pattern with significant bonding strength and good line edge acuity, providing an effective solution toward the microfabrication on various inert polymer substrates. More surprisingly, we find, for the first time, that TiO2 could also be selectively retained on a hydrophobic region to form a negative pattern by simply adjusting the reaction conditions. Further analysis of the mechanism shows that, independent of the deposition conditions, the TiO2 deposition pattern changes gradually, from being initially negative to becoming positive as the deposition time increases. The surface functionality changes (from sulfate to hydroxyl groups) during the deposition, and the resulting difference in the affinity for TiO2 is used to interpret this negative-to-positive pattern change. Such negative patterns refute the conventional opinion that only hydrophilic regions favor the formation of TiO2 films and could be used to fabricate large areas (mm2) of interconnected TiO2 micronetworks. Such networks are difficult to obtain by conventional metallic masks, and the present method is expected to provide new strategies in the fabrication of flexible photomasks and macro/mesoporous TiO2 films. An example is given wherein a patterned photografting of poly(acrylic acid) on the surface of BOPP is achieved by using such a polymer-based photomask. The innovativeness of this method arises from its ability to provide negative patterning, whereas present related approaches have been found only to give positive patterns from an equivalent photomask. Unlike complex photolithography procedures, our irradiation and patterning process does not require the use of positive or negative photoresists, and should thus prove to be a simple, fast, and low-cost method.     

一种室温下制备多孔锐钛矿型TiO2薄膜的方法

 采用具有锐钛矿晶粒的TiO2溶胶与聚苯乙烯球形粒子混合制得涂膜液,通过浸渍提拉法制备薄膜,然后在超声波振荡条件下,以甲苯为溶剂,将薄膜中的聚苯乙烯球选择性地溶解去除,在室温下获得了锐钛矿型多孔TiO2薄膜. 与致密的TiO2薄膜相比,该多孔TiO2薄膜具有较高的光催化活性. 该方法有以下两方面的优点: 一是实现了多孔TiO2薄膜的室温制备,增大了薄膜基材的选择范围; 二是可以通过添加不同粒径的聚苯乙烯球,较为方便地实现了对薄膜孔径的调节.     

Selective atomic layer deposition of titanium oxide on patterned self-assembled monolayers formed by microcontact printing

We demonstrate a selective atomic layer deposition of TiO2 thin films on patterned alkylsiloxane self-assembled monolayers. Microcontact printing was done to prepare patterned monolayers of the alkylsiloxane on Si substrates. The patterned monolayers define and direct the selective deposition of the TiO2 thin film using atomic layer deposition. The selective atomic layer deposition is based on the fact that the TiO2 thin film is selectively deposited only on the regions exposing the silanol groups of the Si substrates because the regions covered with the alkylsiloxane monolayers do not have any functional group to react with precursors.     

TiO2光催化薄膜在陶瓷器具上抗菌效果的研究

抗菌薄膜;TiO2光催化薄膜在陶瓷器具上抗菌效果的研究     

Site selective micro-patterned rutile TiO2 film through a seed layer deposition

Micro-patterned films obtained from micro-contact printing (microCP) method are often challenged by site selectivity limitation. For applications site-selectivity requires improvements. In this paper a site-selective deposition of the rutile TiO2 thin films on patterned SnO2 film, which was formed on the patterned octadecyltrichlorosilane (OTS) SAMs through microCP is described. The depositions proceeded in an environmentally friendly aqueous solution (SnCl4 and peroxotitanium acidic solution) at a lower temperature (80 degrees C). It is shown that the OTS SAMs has a good selectivity deposition for SnO2 particles, which was mainly dominated by the heterogeneous nucleation mechanism. The SnO2 layer had a structure-directing effect for growth of the rutile TiO2, which was usually formed above 600 degrees C. The patterned films were characterized by a variety of techniques, including ellipsometry, optical microscopy, SEM, AFM, XPS, and DLS to determine the thicknesses, topologies, microstructures, chemical compositions of the films, particle sizes and zeta potentials of the titanium particles.     

聚乙二醇对TiO2薄膜光致亲水性的促进作用

为了提高TiO₂薄膜的光致亲水性及其持久性, 将聚乙二醇(PEG)2000 引入TiO₂溶胶中, 利用提拉法在载玻片上制备出含PEG的TiO₂薄膜样品, 通过测试样品紫外光照下水滴接触角的变化, 考察不同浓度PEG对TiO₂薄膜光致亲水性能的影响; 并通过测试光照后的亲水薄膜样片暗处放置不同时间后接触角的变化, 比较含PEG的TiO₂薄膜和纯TiO₂薄膜样品的亲水持久性. 结果表明: PEG作为一种非离子型长链分子, 其适量的添加可促进TiO₂薄膜的光致亲水性及其持久性. 基于薄膜样品的傅里叶变换红外(FTIR)光谱和紫外-可见漫反射光谱(UV-Vis DRS)结果, 认为PEG作为空穴捕获剂有助于TiO₂薄膜中Ti³⁺的生成和稳定存在, 进而有助于亲水中心(表面羟基)的形成. 此研究对于TiO₂光自洁涂料的应用很有意义, 也为研究TiO₂的光激发瞬态行为提供了一个可能的简易方法.     

利用Breath Figures法制备具有蜂窝状结构的 PMMA/TBT复合膜

以聚甲基丙烯酸甲酯(PMMA)和钛酸四丁酯(TBT)的氯仿溶液为铸膜溶液,采用Breath Figures法制备了蜂窝状结构的PMMA/TBT多孔阵列薄膜,采用SEM、JR、XRD对制备的多孔膜进行了表征,探讨了聚合物浓度、PMMA/TBT配比以及水解抑制剂对膜蜂窝状结构的影响.实验结果表明,起始溶液浓度为20～30m...