CuO nanoparticles prepared by alcohol-assisted hydrothermal synthesis for gas-sensing application: effect of pH value

Author affiliations


  • Nguyen Manh Hung Le Quy Don Technical University
  • Phung Dinh Hoat Department of Physics, Le Quy Don Technical University, Hanoi 100000, Viet Nam
  • Pham Tien Hung Department of Physics, Le Quy Don Technical University, Hanoi 100000, Viet Nam
  • Nguyen Van Hoang Department of Materials Science and Engineering, Le Quy Don Technical University, Hanoi, Vietnam



alcohol-assisted hydrothermal; agglomeration; CuO; pH control; H2 detection;


CuO nanoparticles were synthesized by alcohol-assisted hydrothermal method at various pH values, using sodium hydroxide as a precursor for pH control. The chemical composition, morphological and structural properties of the obtained CuO nanoparticles were investigated by the Raman and energy-dispersive X-ray spectroscopies, the field-emission scanning electron microscopy, and the X-ray diffraction. The results reveal that although the pH value does not affect the formation of the CuO phase, it strongly influences the crystalline size, the morphology, and the particle-agglomeration level of CuO. The differences in the morphology and the crystalline size of CuO nanoparticles are ascribed to various H+/OH- ratios of the growth solution. Meanwhile, with the optimized particle size, the CuO nanoparticles-based sensor can be used as a potential candidate for CO and/or H2 detection.


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How to Cite

N. M. Hung, P. D. Hoat, P. T. Hung and N. V. Hoang, CuO nanoparticles prepared by alcohol-assisted hydrothermal synthesis for gas-sensing application: effect of pH value, Comm. Phys. 33 (2023) 435. DOI:



Received 19-04-2023
Accepted 27-10-2023
Published 08-12-2023

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