Humidity sensing properties of CU_2O-PEPC nanocomposite films  

作　　者：Kh.S.Karimov M.Saleem Z.M.Karieva A.Mateen M.Tariq Saeed Chani Q.Zafar 

机构地区：[1]GIK Institute of Engineering Sciences and Technology,Topi-23640,District Swabi,KPK,Pakistan [2]Physical Technical Institute of Academy of Sciences,Rudaki Ave.33,Dushanbe,734025,Tajikistan [3]Government College of Science,Wahdat Road,Lahore-54570,Pakistan [4]Tajik Technical University,Rajabov St.10,Dushanbe 734000,Tajikistan [5]COMSATS Institute of Information Technology,Islamabad,Pakistan

出　　处：《Journal of Semiconductors》2012年第7期11-15,共5页半导体学报（英文版）

基　　金：the GIK Institute of Engineering Sciences and Technology for its support in this work

摘　　要：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.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 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN304.2[自动化与计算机技术—控制科学与工程]