Ultrasensitive, Sustainable, and Selective Electrochemical Hydrazine Detection by ALD-Developed Two-Dimensional WO3

Zihan Wei, Zhenyin Hai, Mohammad Karbalaei Akbari, Jie Hu, Lachlan Hyde, Stephen Depuydt, Francis Verpoort, Serge Zhuiykov

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Wafer-scale two-dimensional (2D) WO3 films with different thicknesses of 0.78, 1.4, 3.6, and 6.5 nm were fabricated on Au-SiO2/Si substrates using an atomic layer deposition technique. Their surface morphologies and chemical components were examined by field-emission scanning electron microscopy, atomic force microscopy and X-ray photoelectron spectroscopy. Cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy were utilized for the analysis of the electrochemical behavior of 2D WO3 films towards hydrazine detection under various conditions. The effect of the thickness of 2D WO3 on the electrochemical performance was also analyzed. Significant improvement in hydrazine sensing capabilities was obtained for monolayer 2D WO3 (0.78 nm), demonstrating a high sensitivity of 1.24 μA μM−1 cm−2, a linear hydrazine concentration detection ranging from 0.2 to 2100 μM, great long-term stability, excellent selectivity and the lowest limit of detection of 0.015 μM reported to date, which provide a great potential method for materials fabrication in the development of high-performance hydrazine detection.

Original languageEnglish
Pages (from-to)266-272
Number of pages7
Issue number2
Publication statusPublished - 1 Jan 2018


  • 2D WO
  • atomic layer deposition
  • hydrazine
  • sensing performance

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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