The triethylamine (TEA) sensors with high response and selective detection have been widely reported. However, sluggish kinetics of recovery process, high operating temperature, unsatisfied long-term stability and high detection limit still restrict their further application. In this work, NiO nanofibers with different contents of Sn²⁺ are prepared via electrospinning method. Gas sensing investigation indicates that the sensor based on 6 at% Sn²⁺ doped NiO nanofibers with an elevated baseline resistance exhibits the highest gas response and excellent recovery characteristic to TEA at 200 ℃. The sensor shows a low detection limit at ppb level and good long-term stability within three months. In addition, the sensor only has a small variation on baseline resistance, gas response and response/recovery speed under different relative humidity. The promising gas sensing performance can be mainly attributed to the increase of the oxygen vacancies defects caused by the difference of Sn²⁺ and Ni²⁺, resistance changes and the hollow structure of as-prepared nanofibers.

原文链接：https://doi.org/10.1016/j.snb.2023.133801