Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Hydrothermal Growth and Characterization of TiO2 Nanorod Films with an Assisted Layer

Author TangDan
Tutor WengWenJian
School Zhejiang University
Course Materials Science and Engineering
Keywords TiO2 Nanorod film Split-phase self-assembly Inducing layer Hydrothermal method Hydrophilic Controllable
CLC TB383.1
Type Master's thesis
Year 2011
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As the most important wide band gap semiconductor titanium dioxide (TiO2) materials, nano may exhibit some of the material has superior performance, which can further promote the TiO2 in the new field of application. Suitable for applications in optoelectronic devices based on TiO2 nano-structured materials in the form of the substrate, and one-dimensional nanostructures as to build primitive, but also production has a high specific surface area and other characteristics of the device. Therefore, the controllable preparation based on one-dimensional structure of the substrate material, the nanorods film or array is an important direction in the current nanomaterials. In this paper, the nanodots film and nano-dense film as inducing layer the hot silicon Sheung Shui controlled growth of TiO2 nanorods film, and this preparation and performance of the system. This phase separation from the dense layer of nano-film and nano point TiO2 Film inducing layer assembly method was spin-coated on a substrate, hydrothermal treatment after heat treatment at different temperatures. The results showed that: in inducing layer anatase phase, with the heat treatment temperature when the heat treatment temperature was 500 ° C, the substrate crystal thin film on a substrate is changed, when the heat treatment temperature was raised to 800 ° C, inducing layer rutile appears. Induced layer of amorphous substrate after hydrothermal treatment on the growth of TiO2 nanorods; the induced layer rutile, its ability to induce more anatase only increase. This article prepared TiO2 nanodots film as inducing layer induced by hydrothermal treatment of the same condition one-dimensional TiO2 nanorods growth capacity compared to the dense film of TiO2 nano-inducing ability of the seed crystal. Hydrothermal parameter changes, you can change the the TiO2 nanorods morphology, size and density. SEM results show that: the use of titanium trichloride the titanium source nanorods morphology of needle-like; tetrabutyl titanate (TBOT) nanorod growth in the titanium source tetragonal rod. Changes in concentration of the titanium source, the substrate TiO2 Nanorods density of can be controlled in the range of 3.7-83μm-2, diameter ~ 20 ~ 244 nm, the length the in ~~ 180 - ~ 826 nm within the range of variation. With the the hydrothermal time change, the nanorods size and density on the substrate can also vary accordingly. XRD and TEM test results show that: titanium trichloride and tetrabutyl titanate as titanium source, the substrate TiO2 nanorods are rutile, the The bar growth direction is [101] and [001]. Both the morphology of the nano-rods by numerous small nanofibers composition, in the acid environment, the substrate layer is first dissolved in a strong acid environment stable rutile phase is then deposited, as the seed crystal growth of rutile Nanorods induced, and then by Orientation adhesion process to form a rod-like structure composed of numerous nanofibers. Wettability and photocatalytic properties of TiO2 nanorods on the substrate test results show that: the final transition to the super-hydrophilic state with the increase in the density of TiO2 nanorods on a substrate, the substrate surface; increase of TiO2 nanorods, the photocatalytic degradation capacity is gradually increased.

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