Impact of Size on Humidity Sensing Property of Copper Oxide Nanoparticles

  • Yang Gu
  • Huina Jiang
  • Zi Ye
  • Ning Sun
  • Xuliang Kuang
  • Weijing LiuEmail author
  • Gaofang Li
  • Xiaojun Song
  • Lei ZhangEmail author
  • Wei Bai
  • Xiaodong Tang
Original Article - Nanomaterials


Three sizes of CuO nanosheets were synthesized by hydrothermal method. The structure and morphology of CuO nanosheets were characterized by X-ray diffraction and scanning electron microscopy. Dielectrophoresis nano-manipulation technique was employed to arrange the materials on pre-designed Ti/Au electrodes to fabricate the three humidity sensors, and the sensing properties were then tested. The experimental results show that the sensitivity greatly increases with the decreasing size of CuO nanosheets, the sensitivity of sensor a, b, c are 369%, 3278%, 22,611% in 97.3% RH, respectively. The smaller sized CuO nanomaterials have better response characteristic, the response time of sensor a, b, c under 11.3–97.3% RH are 53 s, 49 s, 32 s, respectively. And correspondingly, hysteresis properties and the repeatability are also a little influenced. In addition, based on complex impedance spectroscopy and multilayer adsorption theory, the impact of size on humidity sensing property was discussed. The results indicated the feasibility to obtain higher performance of humidity sensor, especially the higher sensitivity, via employment the smaller size sensing nanomaterials.

Graphic Abstract


Humidity sensor CuO nanosheets Dielectrophoresis Complex impedance spectroscopy Multilayer adsorption theory 



This work was supported by the National Natural Science Foundation of China (Grant Nos.61674058, 61604002,), Open Fund of Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University (Grant No. 2019MIP002).


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Copyright information

© The Korean Institute of Metals and Materials 2019

Authors and Affiliations

  1. 1.College of Electronics and Information EngineeringShanghai University of Electric PowerShanghaiChina
  2. 2.Shanghai Installation Engineering Group Co., LtdShanghaiChina
  3. 3.Shanghai Key Laboratory of Multidimensional Information ProcessingEast China Normal UniversityShanghaiChina
  4. 4.Key Laboratory of Polar Materials and DevicesEast China Normal UniversityShanghaiChina

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