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Cho, Yoon-Kyoung
Integrated Nano-Biotech Lab (INBL)
Research Interests
  • Microfluidics, Lab-on-a-chip, personalized biomedical diagnostics, nanobioengineering

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Hierarchically-structured suspended TiO2 nanofibers for use in UVand pH sensor devices

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Title
Hierarchically-structured suspended TiO2 nanofibers for use in UVand pH sensor devices
Author
Lee, Won SeokPark, Yang-SeokCho, Yoon-Kyoung
Keywords
semiconductor nanofiber; direct alignment; electronic device; UV and pH sensor
Issue Date
201407
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.6, no.15, pp.12189 - 12195
Abstract
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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DOI
http://dx.doi.org/10.1021/am501563v
ISSN
1944-8244
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