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<p>This paper presents the deposition of nickel oxide (NiO) nanosheets at 0.05, 0.075, 0.1, and 0.125&#xa0;M solution concentrations by using economical approach of chemical bath deposition (CBD) technique. X-ray diffraction analysis verifies that NiO is polycrystalline with a cubic phase. For NiO film prepared at 0.1&#xa0;M, FE-SEM and AFM analysis reveals the formation of porous micro-structured morphology of randomly oriented nanosheets and the surface roughness of 62.1&#xa0;nm, respectively. XPS analysis reveals Ni<sup>2+</sup> oxidation state in Ni-2p spectra corresponding to the NiO with binding energy peaks at 854.2, 873.1, and 879.8&#xa0;eV andNi<sup>3+</sup> at 855.7 and 861.2&#xa0;eV for Ni<sub>2</sub>O<sub>3</sub>.NiO nanosheets sensing performance evaluated at sensing conditions of 200&#xa0;°C to 100 ppm NO<sub>2</sub>showed32.2% response with <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="339_2025_8320_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="56" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:{\text{T}}_{\text{r}\text{e}\text{s}\text{p}\text{o}\text{n}\text{s}\text{e}}\)</EquationSource> </InlineEquation> = 17&#xa0;s and <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="339_2025_8320_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="56" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:{\text{T}}_{\text{r}\text{e}\text{c}\text{o}\text{v}\text{e}\text{r}\text{y}}\)</EquationSource> </InlineEquation> = 150&#xa0;s. The results suggest that NiO nanosheets made with the CBD process could be suitable options for commercial NO<sub>2</sub> sensing applications at 200&#xa0;°C. Finally, NO<sub>2</sub> sensing mechanism of porous NiO microstructure made up of nanosheets is discussed.</p>

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NiO nanosheet-assembled chemiresistive sensor for NO2 detection

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Ravishankar R. Ambi,
  • Rahul A. Mali,
  • Aniket B. Pawar,
  • Moshim G. Mulla,
  • Raj K. Pittala

摘要

This paper presents the deposition of nickel oxide (NiO) nanosheets at 0.05, 0.075, 0.1, and 0.125 M solution concentrations by using economical approach of chemical bath deposition (CBD) technique. X-ray diffraction analysis verifies that NiO is polycrystalline with a cubic phase. For NiO film prepared at 0.1 M, FE-SEM and AFM analysis reveals the formation of porous micro-structured morphology of randomly oriented nanosheets and the surface roughness of 62.1 nm, respectively. XPS analysis reveals Ni2+ oxidation state in Ni-2p spectra corresponding to the NiO with binding energy peaks at 854.2, 873.1, and 879.8 eV andNi3+ at 855.7 and 861.2 eV for Ni2O3.NiO nanosheets sensing performance evaluated at sensing conditions of 200 °C to 100 ppm NO2showed32.2% response with \(\:{\text{T}}_{\text{r}\text{e}\text{s}\text{p}\text{o}\text{n}\text{s}\text{e}}\) = 17 s and \(\:{\text{T}}_{\text{r}\text{e}\text{c}\text{o}\text{v}\text{e}\text{r}\text{y}}\) = 150 s. The results suggest that NiO nanosheets made with the CBD process could be suitable options for commercial NO2 sensing applications at 200 °C. Finally, NO2 sensing mechanism of porous NiO microstructure made up of nanosheets is discussed.