Polyelectrolyte Multilayer Patterned Formation And Surface Modification Enhancing Selective Adsorption

Patterned surface with tailored micro-/submicro-scale structures and selectiveadsorption of functional materials on patterned surface have aroused wide interestsfor its potential application in many scientific and technological fields, such assupramolecular chemistry, material science and cell biology. By combiningLayer-by-Layer (LbL) self-assembly technique and surface patterned formation, wecan obtain patterned polyelectrolyte multilayer. For the thickness of thepolyelectrolyte multilayer can be adjust by iron intensity, concentration, pH valueand the deposition time, we can control the thickness of the patterned polyelectrolytemultilayer in nanoscale. By exactly controlling the building block in the procedure ofLbL self-assembly, we can not only adjust the physical and chemical property ofpatterned surface exactly and provide an ordered two-dimensional matrix forinterfacial selective adsorption, but also obtain functional patterned polyelectrolytemultilayer surface directly. And we can fabricate patterned polyelectrolyte multilayersurface on the substrate made of various materials, for the LbL self-assemblytechnique can be done on the substrate of any size, any shape and any kinds. Andalso, it is easy to adsorb functional materials on designed areas of the patternedsurface, by using the physical and chemical difference of the patterned surface,which is formed by the different chemical composition, and adjusting the ironintensity, concentration and pH value and using the interaction between buildingblocks in the deposition procedure. This can help us to obtain the patternedpolyelectrolyte multilayer films with controlled structure and composition, and it willbe establish the base of the parts of an apparatus of urtrathin films. Our research group have worked on the LbL self-assembly technique for about 502004 吉林大学硕士学位论文 石峰ten years using the porphyrin, nanoparticles and biomolecular as building block, andwe have developed new method for LbL by using Hydrogen bond, Coordinationbond and covalent bond as driving force. In order to fabricate robust multilayerassemblies, our group develops a new method by combining Ionic Self-assembly andin-situ chemical reaction. The assembled procedure as followed. Firstly, we fabricateultrathin films by LbL self-assembly with polyanions with sulfonic groups,carboxylic groups and phosphatic groups and polycation with diazonium groups. Andthen, we change the driving force interlayer from Electrostatic force to covalent bondby UV irradiation or heating. In this way, we can obtain robust multilayer. By taking the advantage of the different solubility of polyelectrolyte multilayerbefore and after UV irradiation, we can obtain robust multilayer patterning withtailored microscale structures. This kind of high robust pattern has many specialproperties, contrasting with non-covalent bond patterned films, such as it can be usedto induce some kinds of chemical reaction on designed area of the patterned surfacein extreme conditions and it is allow us to do some chemical reactions on thepatterned surface to enhance the physical and chemical difference, which can be usedfor selectively adsorbed functional materials on it. In this thesis, we used polyacrylic acid (PAA) and diazo-resins (DAR), which isphoto sensitive polycation, as building block to fabricated photo sensitivepolyelectrolyte multilayer by LbL self-assembly. By taking the advantage of thedifferent solubility of polyelectrolyte multilayer before and after UV irradiation andpatterned mask assistanted photolithography, we can obtain patterned robustpolyelectrolyte multilayer. In order to enlarge the using of this method, we also usedpoly( aniline-co-N-propanesulfonic acid aniline) as building block to fabricatepatterned multilayer with conductive property. And we selectively adsorbedMethylene Blue to the stripes...