Due to the intrinsic properties of wide band gap and the 5d shell being vacant, WO₃ still has the disadvantages of low response dynamics, slow response/recovery speed and high detection limit for real-time gas monitoring. To address such issues, the Ni³⁺ doped WO₃ hierarchical hollow structure composed of irregular nanosheets was achieved and the content of adsorbed oxygen was adjusted by Ni³⁺ doping to further improve the gas sensing performance of WO₃. In comparison to pure WO₃, the 3 wt%Ni-WO₃ sensor exhibited remarkable response value (396), short response/recovery speed (13 s/6 s) and low detection limit (510 ppt) at 160 ℃. The impressive gas properties could be attributed to the reduced band gap and oxygen inhibiting effect of Ni³⁺ doping, which provides more NO₂ adsorption sites and making it easier for NO₂ to capture more electrons in the conduction band by restraining the oxygen ions chemisorbed on the surface. The unique sensing characteristics of the Ni³⁺ doped WO₃ suggest its wonderful potential applications in environmental pollution gas detection. The mechanism of oxygen inhibiting effect induced by Ni³⁺ doping was also discussed in detail

_{WO 3}由于其宽带隙和5d壳层空置的固有特性，在实时气体监测方面仍然存在响应动力学低、响应/恢复速度慢、检出限高等缺点。针对这些问题，实现了由不规则纳米片组成的Ni ³⁺掺杂WO _{3分级中空结构，并通过Ni} ³⁺掺杂调节吸附氧含量，进一步提高WO ₃的气敏性能。_{与纯 WO 3}相比，3 wt%Ni-WO ₃传感器在 160 ℃ 时表现出显着的响应值 (396)、较短的响应/恢复速度 (13 s/6 s) 和低检测限 (510 ppt)。令人印象深刻的气体特性可归因于 Ni ³⁺掺杂的带隙减小和氧抑制作用，这提供了更多的 NO ₂吸附位点，并通过抑制化学吸附的氧离子使 NO ₂更容易在导带中捕获更多电子在表面上。Ni ³⁺掺杂WO ₃独特的传感特性表明其在环境污染气体检测方面具有广阔的应用前景。详细讨论了Ni ³⁺掺杂引起的氧抑制作用的机理