Hierarchically-structured suspended TiO2 nanofibers for use in UVand pH sensor devices
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- Hierarchically-structured suspended TiO2 nanofibers for use in UVand pH sensor devices
- Lee, Won Seok; Park, Yang-Seok; Cho, Yoon-Kyoung
- semiconductor nanofiber; direct alignment; electronic device; UV and pH sensor
- Issue Date
- AMER CHEMICAL SOC
- ACS APPLIED MATERIALS & INTERFACES, v.6, no.15, pp.12189 - 12195
- Photoelectrochemical sensors based on hierarchically structured titanium dioxide (TiO2) nanofibers (NFs) were fabricated by combination of electrospinning, carbon microelectromechanical systems (MEMS), and hydrothermal reaction. During the electrospinning step, a rotating drum collector was used to align and position NFs of titanium tetraisopropoxide (TTIP) in polyvinylpyrrolidone (PVP) on top of a carbon-MEMS structure. Following calcination under vacuum, a stable ohmic contact was obtained between suspended TiO2-carbon NFs (TiO2/C NF) and the carbon electrodes. Subsequent to this, a hierarchical nanostructure of TiO2 nanowires (TiO2 NWs) was hydrothermally synthesized onto the TiO2/C NFs and successfully utilized as UV and pH sensors. This is the first demonstration of a semiconductor-based nanofiber sensor suspended on carbon electrodes that has been achieved by a relatively simple and cost-effective electrospinning method. Furthermore, these sensors demonstrate a high sensitivity, as well as a stable ohmic contact, due to the large surface area of the TiO2 NWs and the carbon-carbon contact between the suspended TiO2/C NFs and carbon electrodes.
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