We report newly designed pressure and displacement capacitive sensors based on a flexible paper–CNT structure.The carbon nanotube（CNT） powder was deposited on a thin paper substrate and was pressed at an elevated t...We report newly designed pressure and displacement capacitive sensors based on a flexible paper–CNT structure.The carbon nanotube（CNT） powder was deposited on a thin paper substrate and was pressed at an elevated temperature.The sheet resistance of the paper–CNT films was in the range of 2–4 kΩ/cm^2. The paper–CNT films were used to fabricate pressure and displacement sensors. The sensitivities of the pressure and the displacement sensors were found to be17.3 p F·m^2/k N and 0.93 10-3p F/μm, respectively. The experimental results were compared with the simulated data and they found good agreement with each other.展开更多
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, ca-...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, ca- pacitance 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.展开更多
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-...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 10-13μm.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.展开更多
基金Project supported by University Malaya Research Grant(Grant No.RP007A-13AFR)
文摘We report newly designed pressure and displacement capacitive sensors based on a flexible paper–CNT structure.The carbon nanotube（CNT） powder was deposited on a thin paper substrate and was pressed at an elevated temperature.The sheet resistance of the paper–CNT films was in the range of 2–4 kΩ/cm^2. The paper–CNT films were used to fabricate pressure and displacement sensors. The sensitivities of the pressure and the displacement sensors were found to be17.3 p F·m^2/k N and 0.93 10-3p F/μm, respectively. The experimental results were compared with the simulated data and they found good agreement with each other.
文摘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, ca- pacitance 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.
基金the GIK Institute of Engineering Sciences and Technology for its support in this work
文摘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 10-13μm.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.
