Study on Electrical Transport Properties of UV-Sensitive TiO2 Nanotube
|School||Harbin Institute of Technology|
|Keywords||TiO2 nanotubes electrical transport properties UV-sensitive fourprobe electron beam lithography (EBL) Physical Property Measurement System(PPMS)|
Titanium dioxide （TiO2）, as an important wide band gap semiconductormaterial, has been widely used in fields like photocatalysis, the degradationprocessing of pollutants and solar cell, et al. The TiO2 nanomaterial includingnanoparticles, nanowires, nanotubes, etc., have gradually become a research focusbecause of their outstanding physical and chemical properties. TiO2 nanotubesespecially attract more and more attention of the scientific community due to theirown unique structure and excellent performance.One-dimensional nano-material such as nanowires, nanotubes, nanofibers, etc.,shows great prospect in the fabrication of low-dimensional nanodevice because oftheir unique structure and novel properties. The current scientific research on TiO2nanotubes are mainly concentrated in the building methods of nanotube arraystructure, UV-sensitive properties of thin films and its application in photocatalyticdegradation and solar cell, while the electrical transport properties of single TiO2nanotube is rarely found in the Journal. In our current viewpoint, to study theelectrical transport properties of single TiO2 nanotube is vital for understanding theapplication mechanism of TiO2 for use in solar cell and other related fields.In this paper, we did some experimental study and theoretical analysis to theelectrical transport properties of TiO2 nanotubes from a different point of view. Themain contents are as follows:1) We systematically introduced the current research progress of nanomaterialand nanotubes at home and abroad, and we made a simplereview of the research situation of electrical transport properties ofsome major one-dimensional nano-material;2) We described in detail the method of dispersing single TiO2 nanotubefrom the TiO2 nanotube arrays, and we got a single independent TiO2nanotube. Finally, a "four-probe" structure on a single TiO2 nanotubewas successfully prepared by electron beam lithography （EBL）, focusedion beam （FIB） and other semiconductor process.3) We made some contrastively experimental study of TiO2 nanotube arrayfilm and single TiO2 nanotube sensitivity to UV and humidity, and wedid a simple analysis of its mechanism of photosensitive and humiditysensitive.4) Using PPMS （Physical Property Measurement System）, we studied theresistance characteristics and I-V characteristics of the single TiO2nanotube, focusing on the resistance and I-V characteristics’variation with temperature of the single TiO2 nanotube. We made a simpleanalysis of the mechanism.