Fig. 1.
Transducer for investigation of the impedance of the powder under pressure.
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Muhammad Tariq Saeed Chani, Sher Bahadar Khan, Kh. S. Karimov, M. Abid, Abdullah M. Asiri, Kalsoom Akhtar. Synthesis of metal oxide composite nanosheets and their pressure sensing properties[J]. Journal of Semiconductors, 2015, 36(2): 023002. doi: 10.1088/1674-4926/36/2/023002
M T S Chani, S B Khan, Kh. S. Karimov, M. Abid, A. M. Asiri, K Akhtar. Synthesis of metal oxide composite nanosheets and their pressure sensing properties[J]. J. Semicond., 2015, 36(2): 023002. doi: 10.1088/1674-4926/36/2/023002.
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Synthesis of metal oxide composite nanosheets and their pressure sensing properties
doi: 10.1088/1674-4926/36/2/023002
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Abstract
This study presents the synthesis of metal oxides composite nanosheets (oxides of cobalt, zinc and iron) and their pressure sensing properties. A transducer has been fabricated to directly measure the resistance—pressure and impedance—pressure relationships of pristine nanopowder. At the initial stage, a nanopowder sample of 10 mm diameter and 1 mm height was placed in the transducer and by applying pressure of up to 8.15 kN/m2; the DC resistance and the impedance are reduced by 44% on average. It can be explained by the densification of the samples and a decrease in porosity due to the effect of pressure. It was also observed that the DC resistance increases with time and saturated within 8 min. It is considered that this phenomenon is based on the effect of displacement currents of bound charges. The dependences of the impedance phase (θ) on frequency and pressure have also been investigated. -
References
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