纳米片
化学
纳米颗粒
透射电子显微镜
热液循环
化学工程
选择性
纳米技术
扫描电子显微镜
离子
八面体
复合材料
材料科学
有机化学
工程类
催化作用
作者
Mingyue Lv,Shuiting Luo,Ye Tian,Chong Lin,Lin Jiang,Li Li,Keying Shi
摘要
To optimise the morphology and properties of LDH materials, 3D flower-like CuZnAl-LDHs were controllably synthetized by a hydrothermal method. The as-obtained CuZnAl-LDHs were assembled successfully by ultra-thin nanosheets. The optimal sensor (CZA-2) has a high sensitivity and a fast response to 100 ppm NO2 at room temperature (RH = 26%), and its response value and response/recovery time are 22.30 and 2.66/57.60 seconds, respectively. At the same time, it also has a high selectivity and significant long-term stability of up to 8 weeks at RT. The excellent performance of the sensor is attributed to the abnormal phenomenon of octahedral coordination of divalent copper ions in an excess alkaline environment with Zn2+, which increases the LDH layer spacing and is conducive to electron transport. Moreover, the metal hydroxides exhibit a nanosheet morphology under the induction of NH4F and are self-assembled into flower-like hierarchical structures. The existence of nano-islands and ultra-thin 2D layered structures synergistically constructs a fast transmission channel for the electrons, which effectively improves the gas sensing performance of NO2 at room temperature.
科研通智能强力驱动
Strongly Powered by AbleSci AI