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Aluminium phthalocyanine chloride thin films for temperature sensing

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Chinese Physics B 2013年第11期22卷 629-633页

作者： muhammad tariq saeed chani Abdullah M.Asiri Kh.S.Karimov Atif Khan Niaz Sher Bhadar Khan Khalid.A.Alamry Center of Excellence for Advanced Materials Research King Abdulaziz University Department of Chemistry Faculty of Science King Abdulaziz University GIK Institute of Engineering Sciences and Technology Physical Technical Institute Aini St. 299/1

This study presents the fabrication and temperature sensing properties of sensors based on aluminium phthalocyanine chloride （AlPcCl） thin films. To fabricate the sensors, 50-nm-thick electrodes with 50-μ gaps between them are deposited on glass substrates. AlPcCl thin films with thickness of 50–100 nm are deposited in the gap between electrodes by thermal evaporation. The resistance of the sensors decreases with increasing thickness and the annealing at 100 ℃ results in an increase in the initial resistance of sensors up to 24%. The sensing mechanism is based on the change in resistance with temperature. For temperature varying from 25 ℃ to 80 ℃, the change in resistance is up to 60%. Simulation is carried out and results obtained coincide with experimental data with an error of ±1%.

关键词： temperature sensor thin films annealing aluminium phthalocyanine chloride

Synthesis of metal oxide composite nanosheets and their pressure sensing properties

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Journal of Semiconductors 2015年第2期36卷 18-23页

作者： muhammad tariq saeed chani Sher Bahadar Khan Kh.S.Karimov M.Abid Abdullah M.Asiri Kalsoom Akhtar Center of Excellence for Advanced Materials Research (CEAMR) King Abdulaziz University Chemistry Department Faculty of Science King Abdulaziz University Interdisciplinary Research Center COMSATS Institute of Information Technology Physical Technical Institute of Academy of Sciences Division of Nano Sciences and Department of Chemistry Ewha Womans University

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/m^2; 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 （8） on frequency and pressure have also been investigated.

关键词： nanostructures oxides chemical synthesis optical properties electron microscopy

Orange dye polyaniline composite based impedance humidity sensors

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Chinese Physics B 2013年第1期22卷 161-166页

作者： muhammad tariq saeed chani Kh. S. Karimov F. A. Khalid S. Z. Abbas M. B. Bhatty GIK Institute of Engineering Sciences and Technology Topi 23640 Khyber Pakhtunkhwa Pakistan Center of Excellence for Advanced Materials Research (CEAMR) King Abdulaziz University Jeddah 21589 P.O. Box 80203 Saudi Arabia Physical Technical Institute Aini St. 299/1 Dushanbe 734063 Tajikistan

This study presents the fabrication and investigation （PANI） composite films. A blend of 3 wt.% OD with 1 of humidity sensors based on orange dye （OD） and polyaniline wt.% PANI was prepared in 1 ml water. The composite films were deposited on glass substrates between pre-deposited silver electrodes. The gap between the electrodes was 45 um. The sensing mechanism was based on the impedance and capacitance variations due to the absorption/desorption of water vapor. It was observed that with the increase in relative humidity （RH） from 30% to 90%, the impedance decreases by 5.2 × 10^4 and 8.8 × 10^3 times for the frequencies of 120 Hz and 1 kHz, respectively. The impedance-humidity relationship showed a more uniform change compared to the capacitance-humidity relationship in the RH range of 30% to 90%. The consequence of annealing, measuring frequency, response and recovery time, and absorption-desorption behavior of the humidity sensor were also discussed in detail. The annealing resulted in an increase in sensitivity of up to 2.5 times, while the measured response time and recovery time were 34 s and 450 s, respectively. The impedance-humidity relationship was simulated.

关键词： organic-organic composite humidity sensor polyaniline orange dye

Temperature sensor based on composite film of vanadium complex(VO_2(3-fl))and CNT

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Journal of Semiconductors 2015年第7期36卷 34-38页

作者： Kh.S.Karimov M.Mahroof-Tahir M.Saleem M.tariq saeed chani A.Khan Niaz GIK Institute of Engineering Sciences and Technology Center for Innovative Development of Science and New Technologies Academy of Sciences Department of Chemistry and Earth Sciences Qatar University Government College of Science Center of Excellence for Advanced Materials Research (CEAMR) King Abdulaziz University

A vanadium complex （VO2（3-fl）） and CNT composite film based temperature sensor is reported in this study. Surface-type silver electrodes were deposited on the glass substrates. A thin film of VOE（3-fl） and CNT composite was coated as a temperature-sensing material on the top of the pre-patterned Ag electrodes. The temperature-sensing principle of the sensor was based on the conductivity change of the coated sensing element upon heating or cooling processes. DC and AC （100 Hz） resistances of the temperature sensor decreased quasi- linearly with increasing the temperature in the range of 25-80 ℃. The overall resistance of the sensor decreases by 1.8-2.1 and 1.9-2.0 times at DC and AC voltage, respectively. The resistance temperature coefficients of the sensor were in the range of-（0.9-1.3）% and -（1.1-1.3）% at DC and AC voltage, respectively. The properties of the sensor studied in this work, make it beneficial to be used in the instruments for environmental monitoring of temperature.

关键词： CNT vanadium complex film temperature sensor resistance

Humidity sensing properties of CU_2O-PEPC nanocomposite films

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Journal of Semiconductors 2012年第7期33卷 11-15页

作者： Kh.S.Karimov M.Saleem Z.M.Karieva A.Mateen M.tariq saeed chani Q.Zafar GIK Institute of Engineering Sciences and Technology Topi-23640District SwabiKPKPakistan Physical Technical Institute of Academy of Sciences Rudaki Ave.33Dushanbe734025Tajikistan Government College of Science Wahdat RoadLahore-54570Pakistan Tajik Technical University Rajabov St.10Dushanbe 734000Tajikistan COMSATS Institute of Information Technology IslamabadPakistan

A blend of copper oxide nanopowder （Cu2O）, 3 wt.%, and poly-N-epoxypropylcarbazole （PEPC）, 2 wt.%, in benzol was drop-casted on glass substrates with pre-deposited surface-type silver electrodes for the fabrication of Cu20-PEPC nanocomposite thin films. The thicknesses of the Cu20-PEPC films were in the range of 10-13 μm. The effect of humidity on the electrical properties of the nanocomposite films was investigated by measuring the capacitance and dissipation of the samples at two different frequencies of the applied voltage： 120 Hz and 1 kHz. The AC resistance of the samples was determined from the dissipation values, and the DC resistance was measured directly. The effect of ageing on the humidity sensing properties of the nanocomposite was observed. After ageing, it was observed that at 120 Hz and 1 kHz, under a humidity of up to 86% RH, the capacitance of the cell increased by 85 and 8 times, and the resistance decreased by 345 and 157 times, accordingly, with respect to 30% RH conditions. It was found that with an increase in frequency, the capacitance and resistance of the samples decreased. It is assumed that the humidity response of the cell is associated with the diffusion of water vapors and doping of the semiconductor nanocomposite by water molecules.

关键词： cuprous oxide composite nano-powder poly-N-epoxypropylcarbazole humidity sensor