Journal of Materials Science: Materials in Electronics

, Volume 29, Issue 22, pp 19558–19566 | Cite as

Construction of Co3O4 nanorods/In2O3 nanocubes heterojunctions for efficient sensing of NO2 gas at low temperature

  • Dongzhi ZhangEmail author
  • Di Wu
  • Yuhua Cao
  • Xiaoqi Zong
  • Zhimin Yang


The development of NO2 gas sensor with high sensitivity, low detection limit and high selectivity is highly required. This article reports a NO2 gas sensor based on Co3O4/In2O3 heterojunction structure fabricated by a two-step hydrothermal method. Particularly, morphological and structural analysis of the Co3O4 nanorods/In2O3 nanocubes nanocomposite was examined by SEM, TEM, XRD, EDS and XPS measurements. The Co3O4/In2O3 nanocomposite sensor was tested toward NO2 gas (1–200 ppm) under different operation temperature. The sensor exhibited excellent gas sensing properties for NO2 sensing at an optimal temperature of 150 °C. The corresponding response is 27.9 to 10 ppm NO2 at 150 °C, 1.2 times higher than that of pure In2O3 and 10 times higher than that of pure Co3O4. Moreover, the Co3O4/In2O3 sensor shows sub-ppm level detection ability, good selectivity and long-term stability at low temperature. The enhanced sensing performance can be attributed to the Co3O4/In2O3 heterojunction structure formed at the interfaces of n-type In2O3 nanocubes and p-type Co3O4 nanorods.



This work was supported by the National Natural Science Foundation of China (No. 51777215), the Key Research & Development Plan Project of Shandong Province (2018GSF117002), the Fundamental Research Funds for the Central Universities of China (18CX07010A), the Open Fund of Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology, State Oceanic Administration of China (No. 201801).


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Authors and Affiliations

  1. 1.College of Information and Control EngineeringChina University of Petroleum (East China)QingdaoChina
  2. 2.Key Laboratory of Unconventional Oil & Gas Development, Ministry of EducationChina University of Petroleum (East China)QingdaoChina

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