Electronic Properties And Hemocompatibility Study On Liquid Phase Deposited TiO₂Film Mediated By Self-assembled Templates

Titanium dioxide (TiO2) films have already found its wide applications and increasingly intrigued investigators in various fields such as solar energy conversion, photocatalysis, gas sensing, optical antireflection and anti-thrombogenic and antibacterial coating. Principally, such wide applications are based on its unique(exclusive) electronic/semiconducting characteristics, while the quality of TiO2films and electronic properties are decisively dependent on the preparation conditions.Recently, there emerged a growing interest in surface template inducing approach to fabricate TiO2films by liquid phase deposition. The mechanism lies in prompting the film crystal nucleation and growth via the functional surface in an aqueous supersaturated titanium precursor solution. Of special advantage is that such method can not only offer wide alternatives of template layers but also tailor the deposition according to advanced demands by the way of controlling the rate of TiO2film deposition nucleation and the tendency of crystal growth to meet the needs of particular function and characteristic. Besides, such kind of chemical process usually benefits an uniform and unrestrained film growth as compared with unbalanced physical deposition processes.In this work, TiO2films were prepared on aminopropyltriethoxysilane (APTE) and Poly-dopamine (PDA)self-assembled templates through liquid phase deposition method. Through SEM, AFM, FTIR, XPS, acid orange Ⅱ amino quantification, water contact angle tests The differences, from the perspective of surface morphology, functional groups, chemical bondings, surface free energy, of the titanium dioxide films deposited on the two different templates were analyzed. Furthermore, films electronic properties and hemocompatibility were tested and evaluated, based on the results, influences of templates on the films properties and performance was discussed. Characterization results show that agglomerated garnet-shaped anatase TiO2with nano-scale structure were obtained on both templates. And the APTE template, which is net-structured and possess more amino groups, show higher inducing efficiency in the initial film nucleation and growth process. Films deposited on APTE template were superior to films deposited on PDA template in aspects such as surface smoothness and film sructural compactness. Besides, with higher carrier concentration, larger electrochemical impedance, larger electric double layer capacitors, and stronger inhibition to charge-transfer, TiO2films prepared on the APTE template exerts better photoluminescence properties. Blood test result, in terms of inhibiting platelet aggregation and adhesion of platelet and anti-hemolytic performance, showed that TiO2films deposited on APTE template possess better hemocompatibility.The presented unlike films electronic properties and hemocompatibility performance are strongly dependent on film surface morphology, surface energy, crystallinity, etc, while these film properties are closely related to the effect of template on film deposition. Therefore, all these influencing factors correlate to one another, they together manifests the regulation function of the template to deposited TiO2films.