Zhang Heng, Xiao Jing, Chen Jun, Wang Yan, Zhang Lian, Yue Shuai, Li Suyan, Huang Tao, Sun Da
College of Physics and Electronic Engineering, Taishan University, Taian 271000, China.
Institute of Life Sciences & Biomedical Collaborative Innovation Center of Zhejiang Province, Wenzhou University, Wenzhou 325035, China.
Nanomaterials (Basel). 2022 Jul 18;12(14):2460. doi: 10.3390/nano12142460.
As a typical -type semiconductor gas-sensing material, LaFeO has good response stability to HS, but its responsiveness is low, and the detection limit is not low enough for large-scale use in the field of gas sensors. To obtain better performance, we synthesized Pd modified LaFeO using the sol-gel method. A total of 3 wt% of Pd-LaFeO with a high specific surface area had the highest response to HS (36.29-1 ppm) at 120 °C, with relatively fast response-recovery times (19.62/15.22 s), and it had higher selectivity to HS with other gases. Finally, we detected the HS concentrations in the air around the shrimps, and the HS concentrations that we obtained by the 3 wt% Pd-LaFeO in this study were within 10% of those obtained by GC-MS. According to the experimental results, noble-metal surface modification improves the performance of gas-sensing materials, and Pd-LaFeO has considerable potential in HS detection.
作为一种典型的n型半导体气敏材料，LaFeO对H₂S具有良好的响应稳定性，但其响应性较低，且检测限对于气敏传感器领域的大规模应用而言不够低。为了获得更好的性能，我们采用溶胶-凝胶法合成了Pd修饰的LaFeO。共3 wt%的具有高比表面积的Pd-LaFeO在120℃时对H₂S（36.29-1 ppm）具有最高响应，响应-恢复时间相对较快（19.62/15.22 s），并且对H₂S与其他气体相比具有更高的选择性。最后，我们检测了虾周围空气中的H₂S浓度，本研究中3 wt% Pd-LaFeO所获得的H₂S浓度与气相色谱-质谱联用仪（GC-MS）所获得的浓度相差在10%以内。根据实验结果，贵金属表面修饰提高了气敏材料的性能，并且Pd-LaFeO在H₂S检测方面具有相当大的潜力。
