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<p>The low-cost spray pyrolysis technique is used for fabrication of NiO/ZnO bi-layer heterostructured nanomaterial&#xa0;on glass substrates at deposition temperature of 375°C. The&#xa0;XRD analysis shows the polycrystalline nature with distinct wurtzite and cubic crystal structures for ZnO and NiO, respectively. The FE-SEM micrograph shows the hierarchical bundles of nanosheets-like morphology with pores of varying sizes. FE-SEM cross-sectional images show the distinct nanorods and bundles of nanosheets-like morphologies. An EDX analysis verifies the existence of ZnO and NiO phases. The AFM micrograph reveals a greater root mean square (RMS) surface roughness of 127.76 nm for 772 nm film thickness. The XPS study gives core-level spin-orbit components of Zn-2p and Ni-2p corresponding to Zn<sup>2+</sup> in ZnO and Ni<sup>2+</sup> in NiO, respectively. The optical band gaps vary between 3.5 and 3.7 eV. The p-NiO/n-ZnO heterostructure yield a 95.8% response for 772 nm film thickness at 150ºC to 80 ppm NO<sub>2</sub> with response-recovery rates of 12 s and 140 s. Lastly, NiO/ZnO NO<sub>2</sub> sensing mechanism is discussed.</p>

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NiO/ZnO nanoheterostructured chemiresistive sensor: a promising platform for NO2 detection

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Moshim Gulab Mulla,
  • Raj Kumar Pittala,
  • Ravishankar Ramesh Ambi

摘要

The low-cost spray pyrolysis technique is used for fabrication of NiO/ZnO bi-layer heterostructured nanomaterial on glass substrates at deposition temperature of 375°C. The XRD analysis shows the polycrystalline nature with distinct wurtzite and cubic crystal structures for ZnO and NiO, respectively. The FE-SEM micrograph shows the hierarchical bundles of nanosheets-like morphology with pores of varying sizes. FE-SEM cross-sectional images show the distinct nanorods and bundles of nanosheets-like morphologies. An EDX analysis verifies the existence of ZnO and NiO phases. The AFM micrograph reveals a greater root mean square (RMS) surface roughness of 127.76 nm for 772 nm film thickness. The XPS study gives core-level spin-orbit components of Zn-2p and Ni-2p corresponding to Zn2+ in ZnO and Ni2+ in NiO, respectively. The optical band gaps vary between 3.5 and 3.7 eV. The p-NiO/n-ZnO heterostructure yield a 95.8% response for 772 nm film thickness at 150ºC to 80 ppm NO2 with response-recovery rates of 12 s and 140 s. Lastly, NiO/ZnO NO2 sensing mechanism is discussed.