Yoo Ran, Oh Chihon, Song Min-Jung, Cho Sungmee, Lee Wooyoung
Department of Materials Science and Engineering, Yonsei University, 262 Seongsanno Seodaemun-gu, Seoul, 129-749, Korea.
College of Liberal Art and Interdisciplinary Studies, Kyonggi University, 154-42 Gwanggyosan-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-760, Korea.
J Nanosci Nanotechnol. 2018 Feb 1;18(2):1232-1236. doi: 10.1166/jnn.2018.14205.
In this work, we present the fabrication and characterization of a 2-chloroethyl ethyl sulfide (2-CEES) gas sensor based on ZnO nanoparticles (NPs) synthesized by a hydrothermal method. We confirmed that synthesized ZnO NPs adopt a polycrystalline phase. Partially aggregated ZnO-NPs revealed spherical or ellipsoidal nanocrystalline particles in a size range of 30-50 nm, as observed by field-emission scanning electron microscopy (FE-SEM). The maximum response of the ZnO NPs was 15 at 1 ppm 2-CEES concentration, and a low detection limit of 0.4 ppm was observed at an optimal operating temperature of 250 °C. The lowest response time was 6 s in 20 ppm at 250 °C. The linearity response with correlation coefficient (R2) was 0.9887 at 2-CEE concentrations of 0.4-1 ppm at the operating temperature of 250 °C. The enhanced sensing performance and a decrease in the operating temperature were attributed to a high specific surface area and more active sites in the ZnO NPs after exposure to 2-CEES.
在本工作中，我们展示了基于水热法合成的ZnO纳米颗粒（NPs）的2-氯乙基乙基硫醚（2-CEES）气体传感器的制备及表征。我们证实合成的ZnO NPs为多晶相。通过场发射扫描电子显微镜（FE-SEM）观察发现，部分聚集的ZnO-NPs呈现出尺寸范围为30-50 nm的球形或椭球形纳米晶体颗粒。在2-CEES浓度为1 ppm时，ZnO NPs的最大响应为15，在250 °C的最佳工作温度下观察到低检测限为0.4 ppm。在250 °C下，20 ppm时最低响应时间为6 s。在250 °C的工作温度下，2-CEE浓度为0.4-1 ppm时，线性响应的相关系数（R2）为0.9887。传感性能的增强以及工作温度的降低归因于暴露于2-CEES后ZnO NPs具有高比表面积和更多活性位点。
