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Sensitivity enhancement of OD- and OD-CNT-based humidity sensors by high gravity thin film deposition technique

Kh. S. Karimov1, 2, Noshin Fatima1, Khaulah Sulaiman3, M. Mahroof Tahir4, 5, Zubair Ahmad3 and A. Mateen6

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 Corresponding author: Zubair Ahmad, E-mail: zubairtarar@um.edu.my

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Abstract: The humidity sensing properties of the thin films of an organic semiconductor material orange dye (OD) and its composite with CNTs deposited at high gravity conditions have been reported. Impedance, phase angle, capacitance and dissipation of the samples were measured at 1 kHz and room temperature conditions. The impedance decreases and capacitance increases with an increase in the humidity level. It was found that the sensitivity of the OD-based thin film samples deposited at high gravity condition is higher than the samples deposited at low gravity condition. The impedances and capacitance sensitivities of the of the samples deposited under high gravity condition are 6.1 times and 1.6 times higher than the films deposited under low gravity condition.

Key words: orange dyesensorcompositeimpedancecapacitance



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Fig. 1.  (a) The molecular structure of the orange dye (OD). (b) Schematic diagrams of the samples, substrate (1), electrodes (2), OD-CNT composite film (3), and terminals (4) and (5).

Fig. 2.  (a), (b) Optical images of the orange dye films deposited at 1 g and 70 g, respectively. (c), (d) Optical images of the orange OD-CNT films deposited at 1 g and 70 g, respectively.

Fig. 3.  (Color online) Humidity dependent characteristic of OD and OD-CNT composite film deposited at different gravity conditions.

Fig. 4.  The equivalent electric circuit of the samples.

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Table 1.   Impedance $S (Z)$ and capacitance $S (C)$ sensitivities of the samples based on OD and OD-CNT films deposited at 1 g and 70 g.

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    Received: 19 September 2014 Revised: Online: Published: 01 March 2015

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      Kh. S. Karimov, Noshin Fatima, Khaulah Sulaiman, M. Mahroof Tahir, Zubair Ahmad, A. Mateen. Sensitivity enhancement of OD- and OD-CNT-based humidity sensors by high gravity thin film deposition technique[J]. Journal of Semiconductors, 2015, 36(3): 034005. doi: 10.1088/1674-4926/36/3/034005 Kh. S. Karimov, N Fatima, K Sulaiman, M. M. Tahir, Z Ahmad, A. Mateen. Sensitivity enhancement of OD- and OD-CNT-based humidity sensors by high gravity thin film deposition technique[J]. J. Semicond., 2015, 36(3): 034005. doi:  10.1088/1674-4926/36/3/034005.Export: BibTex EndNote
      Citation:
      Kh. S. Karimov, Noshin Fatima, Khaulah Sulaiman, M. Mahroof Tahir, Zubair Ahmad, A. Mateen. Sensitivity enhancement of OD- and OD-CNT-based humidity sensors by high gravity thin film deposition technique[J]. Journal of Semiconductors, 2015, 36(3): 034005. doi: 10.1088/1674-4926/36/3/034005

      Kh. S. Karimov, N Fatima, K Sulaiman, M. M. Tahir, Z Ahmad, A. Mateen. Sensitivity enhancement of OD- and OD-CNT-based humidity sensors by high gravity thin film deposition technique[J]. J. Semicond., 2015, 36(3): 034005. doi:  10.1088/1674-4926/36/3/034005.
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      Sensitivity enhancement of OD- and OD-CNT-based humidity sensors by high gravity thin film deposition technique

      doi: 10.1088/1674-4926/36/3/034005
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      • Corresponding author: E-mail: zubairtarar@um.edu.my
      • Received Date: 2014-09-19
      • Accepted Date: 2014-10-21
      • Published Date: 2015-01-25

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