0.1–2 wt% Nb-doped SnO₂ nanoparticles were produced via flame spray pyrolysis (FSP) in a single step for the first time. The structural characterizations including X-ray diffraction, nitrogen sorption analysis, electron microscopy, energy dispersive and photoelectron X-ray spectroscopy revealed that Nb⁵⁺ species were substitutionally doped into the lattice of nanocrystalline tetragonal SnO₂ nanoparticles (5–15 nm). The sensing layers produced by spin coating were tested towards 0.05–1 vol% C₂H₂ at 200–400 °C in air. Gas-sensing results indicated that the optimal Nb content of 0.5 wt% provided the best sensor response of ~776 with an excellent response time of 1.1 s to 1 vol% C₂H₂ at the optimal sensing temperature of 350 °C. Additionally, the optimal Nb-doped SnO₂ sensor exhibited low humidity dependence, good long-term stability and high C₂H₂ selectivity relative to HCHO, CH₃OH, C₂H₅OH, C₃H₆O, CH₄, C₂H₄, C₆H₆, C₇H₈, C₈H₁₀, H₂, NO₂, NO and NH₃. Moreover, low direct cross interferences were demonstrated against CH₃OH and C₈H₁₀. The results were explained by the catalytic and electronic roles of n-type Nb dopants on C₂H₂ interaction. Thus, the Nb-doped SnO₂ sensor is an attractive candidate for selective C₂H₂-sensing applications.

0.1–2 wt% Nb 掺杂的 SnO ₂纳米颗粒是首次通过火焰喷雾热解 (FSP) 一步生产。包括 X 射线衍射、氮吸附分析、电子显微镜、能量色散和光电子 X 射线光谱在内的结构表征表明，Nb ⁵⁺物种被置换掺杂到纳米晶四方 SnO ₂纳米颗粒（5-15 nm）的晶格中。通过旋涂产生的传感层在 200-400 °C 的空气中以 0.05-1 vol% C ₂ H ₂进行测试。气敏结果表明，0.5 wt% 的最佳 Nb 含量提供了约 776 的最佳传感器响应，对 1 vol% C ₂ H 的响应时间为 1.1 s₂在 350 °C 的最佳传感温度下。此外，最佳的 Nb 掺杂 SnO ₂传感器表现出低湿度依赖性、良好的长期稳定性和相对于 HCHO、CH ₃ OH、C ₂ H ₅ OH、C ₃ H ₆ O、CH _{4 的}高 C ₂ H ₂选择性， C ₂ H ₄、C ₆ H ₆、C ₇ H ₈、C ₈ H ₁₀、H ₂、NO ₂、NO 和NH ₃. 此外，还证明了对 CH ₃ OH 和 C ₈ H _{10 的}直接交叉干扰较低。结果可以通过 n 型 Nb 掺杂剂对 C ₂ H ₂相互作用的催化和电子作用来解释。因此，Nb 掺杂的 SnO ₂传感器是选择性 C ₂ H ₂传感应用的有吸引力的候选者。