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TiO2 nanowires grown from nanoparticles: structure and charge density study.
P Mohanty1, S Saravanakumar, R Saravanan
1School of Materials Science and Technology, Indian Institute of Technology, Banaras Hindu University, Varanasi, UP 221005, India.
Journal of Nanoscience and Nanotechnology
|November 20, 2013
Summary
We synthesized high-aspect-ratio titanium dioxide (TiO2) nanowires using a two-step hydrothermal method. These anatase phase nanowires exhibit a single crystalline structure and lack impurities, showing enhanced ionic properties compared to nanoparticles.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Chemistry
Background:
- Titanium dioxide (TiO2) nanomaterials are crucial for various applications.
- Controlling the morphology and phase of TiO2 is essential for optimizing its properties.
- Hydrothermal synthesis offers a versatile route for nanomaterial fabrication.
Purpose of the Study:
- To synthesize high-aspect-ratio TiO2 nanowires using a two-step hydrothermal process.
- To characterize the structural, phase, and electronic properties of the synthesized nanowires.
- To investigate the presence of impurities and compare the ionic nature of nanowires with nanoparticles.
Main Methods:
- Two-step hydrothermal synthesis using TiO2 nanoparticles and NaOH.
- Characterization via Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Micro-Raman Spectroscopy, and X-ray Photoemission Spectroscopy (XPS).
- Electronic structure analysis using the Maximum Entropy Method (MEM) with XRD data.
Main Results:
- Successfully synthesized high-aspect-ratio TiO2 nanowires with the anatase phase.
- Confirmed single crystalline nature through High-Resolution Electron Microscopy (HREM) and Selected Area Electron Diffraction (SAED).
- XPS and Energy-Dispersive Spectroscopy (EDS) refuted the presence of sodium (Na) impurities.
- MEM simulations indicated that TiO2 nanowires are more ionic than TiO2 nanoparticles.
Conclusions:
- The two-step hydrothermal method is effective for producing pure, single-crystalline anatase TiO2 nanowires.
- The synthesized nanowires possess distinct electronic properties, exhibiting higher ionic character than their nanoparticle counterparts.
- This study provides valuable insights into the synthesis and properties of TiO2 nanowires for advanced applications.
