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  5. Impact of hydrogen concentrations on the impedance spectroscopic behavior of Pd-sensitized ZnO nanorods
 
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Impact of hydrogen concentrations on the impedance spectroscopic behavior of Pd-sensitized ZnO nanorods

Journal
Nanoscale Research Letters
ISSN
1556-276X
Date Issued
2013-02-11
Author(s)
Muhammad Kashif
Universiti Malaysia Perlis
Md Eaqub Ali
Universiti Malaya
Syed M Usman Ali
Universiti Malaysia Perlis
Uda Hashim
Universiti Malaysia Perlis
Sharifah Bee Abd Hamid
Universiti Malaya
DOI
10.1186/1556-276X-8-68
Abstract
ZnO nanorods were synthesized using a low-cost sol-gel spin coating technique. The synthesized nanorods were consisted of hexagonal phase having c-axis orientation. SEM images reflected perpendicular ZnO nanorods forming bridging network in some areas. The impact of different hydrogen concentrations on the Pd-sensitized ZnO nanorods was investigated using an impedance spectroscopy (IS). The grain boundary resistance (Rgb) significantly contributed to the sensing properties of hydrogen gas. The boundary resistance was decreased from 11.95 to 3.765 kΩ when the hydrogen concentration was increased from 40 to 360 ppm. IS gain curve showed a gain of 6.5 for 360 ppm of hydrogen at room temperature. Nyquist plot showed reduction in real part of impedance at low frequencies on exposure to different concentrations of hydrogen. Circuit equivalency was investigated by placing capacitors and resistors to identify the conduction mechanism according to complex impedance Nyquist plot. Variations in nanorod resistance and capacitance in response to the introduction of various concentrations of hydrogen gas were obtained from the alternating current impedance spectra.
Subjects
  • Impedance behavior

  • Nyquist plot

  • Pd-sensitized ZnO nan...

  • Sol-gel

File(s)
Impact of hydrogen concentrations on the impedance spectroscopic behavior of Pd-sensitized ZnO nanorods.pdf (1.13 MB)
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