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Synthesis, Characterization and Properties of Ti-based Nanomaterials

Author: TaoHaiSheng
Tutor: HuZheng
School: Nanjing University
Course: Physical and chemical
Keywords: Nanomaterials Nanotube Arrays Characterization Nanowire arrays Hydrothermal Nanostructures Complexes Sodium titanate Morphology Titanium dioxide Ruthenium oxide Template Self-assembly method Solution Electron micrograph Titanium base Supercapacitors Iron acid Biosensor Electrodeposition
CLC: O614.411
Type: PhD thesis
Year: 2010
Downloads: 29
Quote: 0
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Abstract


Ti-based nanomaterials have become a topic of extensive interest in the nanomaterials world, where their excellent physicochemical properties make them suitable for wide applications in catalysis, photoelectric conversion, sensor, and energy field. The researches on the synthesis, characterization and property of Ti-based nanomaterials are significant in basic theories and potential applications, which is the major content of this dissertation. The main progresses are summarized as below:1. Titanate nanotubes (TNT) have been successfully synthesized by hydrothermal route. The structure, composition and morphology of TNT can be controlled by changing the precursor, reaction temperature and time. The growth mechanism of TNT has also been rationally discussed. Titanate is environmentally benign, chemically stable and biocompatible material. Titanate is also favorable for the immobilization of some hydrophilic species due to its functional hydroxyl groups. Herein, uricase was immobilized onto TNT to form uricase-TNT composite. After that, a biosensor (Uricase-TNT/GC) was obtained by casting the uricase-TNT composite onto glassy carbon electrodes (GC). Uricase-TNT composite retains the uricase’s bioactivity, and enhances the direct electron transfer between the uricase and the electrodes. Uricase-TNT/GC exhibits a high electrocatalytic activity to uric acid. Additionally, Titanate is a good support for the deposition of hydrous ruthenium oxide. The so-constructed hydrous ruthenium oxide-TNT composite possesses large capacity, and suits for long-time repeated charge-discharge at high speed. These results indicate that TNT is a promising material in the application of biosensors and supercapacitors. 2. Vertically aligned titania nanotube array has been prepared by anodization method. After systematic and deep study, the experimental parameters, such as electrolyte category, voltage and time, have been optimized. The growth mechanism of different morphologies was also analyzed. Titania nanotube array possesses good electronic contact with substrate. Herein, hydrous ruthenium oxide and cupric oxide have been electrodeposited into the tubes of titania nanotube array, respectively. The obtained hydrous ruthenium oxide-titania nanotube array film owns enhanced specific capacitance. The as-prepared cupric oxide-titania nanotube array is a p-n heterojunction because cupric oxide and titania are a p-and n-type semiconductor, respectively. The p-n heterojunction processes nonlinear I-V response. These results imply that titania nanotube array has potential applications in supercapacitors and micro-electronics.3. Titanate nanosheet (TNS) is a two dimensional biocompatible material. Compared with the isoelectric point of biomolecules (-7), TNS has a lower isoelectric point (1.2). Hence it’s possible to prepare a biomolecule-TNS composite with sandwich structure by self-assembly in a wide range of pH. Herein, a hemoglobin-titanate nanosheet composite (Hb-TNS), where the positive hemoglobin (HB) molecules were intercalated into the negative TNS, was assembled by turning the pH of electrolyte. After that, a biosensor (Hb-TNS/GC) was obtained by casting the composite onto GC electrode. The so-constructed biosensor retains the bioactivity of the immobilized Hb, enhances the endurance of Hb to high temperature and strong acid or alkali, accelerates the direct electron transfer between the Hb and the electrode, and exhibits high electrocatalytic activity to O2. These results indicate that titanate nanosheet has potential applications in biosensors.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section Ⅳ group metal elements and their compounds > The titanium Vice family ( IV B group metal elements) > Ti Ti
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