Liu Xiaolian, Li Jing, Guo Lanlan, Wang Guodong
School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo 454003, China.
Nanomaterials (Basel). 2022 Oct 20;12(20):3679. doi: 10.3390/nano12203679.
The acetone-sensing performance of BiFeO is related to structural phase transformation, morphology and band gap energy which can be modulated by rare-earth ions doping. In this work, BiErFeO nanoparticles with different amounts of Er doping were synthesized via the sol-gel method. The mechanism of Er doping on acetone-sensing performance of BiErFeO (x = 0, 0.05, 0.1 and 0.2) sensors was the focus of the research. The optimal working temperature of BiErFeO (300 °C) was decreased by 60 °C compared to BiFeO (360 °C). The BiErFeO sample demonstrated the optimal response to 100 ppm acetone (43.2), which was 4.8 times that of pure BFO at 300 °C. The primary reason, which enhances the acetone-sensing performance, could be the phase transformation induced by Er doping. The lattice distortions induced by phase transformation are favorable to increasing the carrier concentration and mobility, which will bring more changes to the hole-accumulation layer. Thus, the acetone-sensing performance of BiErFeO was improved.
BiFeO 的丙酮传感性能与结构相变、形貌以及能隙能量有关，而这些可通过稀土离子掺杂来调控。在本工作中，采用溶胶 - 凝胶法合成了不同 Er 掺杂量的 BiErFeO 纳米颗粒。研究重点是 Er 掺杂对 BiErFeO（x = 0、0.05、0.1 和 0.2）传感器丙酮传感性能的影响机制。BiErFeO 的最佳工作温度（300 °C）相较于 BiFeO（360 °C）降低了 60 °C。BiErFeO 样品对 100 ppm 丙酮表现出最佳响应（43.2），这是纯 BFO 在 300 °C 时响应的 4.8 倍。增强丙酮传感性能的主要原因可能是 Er 掺杂诱导的相变。相变引起的晶格畸变有利于增加载流子浓度和迁移率，这会给空穴积累层带来更多变化。因此，BiErFeO 的丙酮传感性能得到了改善。
