聚乙烯亚胺
材料科学
复合数
热液循环
纳米技术
碳纳米管
基质(水族馆)
纳米颗粒
导电体
选择性
化学工程
复合材料
地质学
工程类
海洋学
催化作用
生物
化学
细胞培养
生物化学
遗传学
转染
作者
Laixu Gao,Songquan Li,Xiaoxue Xu,Chen Zou,Zhang Guo
摘要
The highly dispersed Co3O4 on the surface of CNTs modified with polyethylenimine (PEI) was synthesized using the hydrothermal method. In the CNT-Co3O4 composite materials, CNTs not only provide the substrate for the Co3O4 nanoparticles but also prevent their aggregation. Furthermore, the interaction between Co3O4 and CNTs modified with polyethylenimine (PEI) helps to improve the gas sensing performance. In particular, the CNT-Co3O4 composite synthesized at 190°C shows the outstanding sensitive characteristics to H2 with a lower detection limit of 30 ppm at room temperature. The obtained CNT-Co3O4 sensor displays excellent selectivity and stability to H2. The energy band model of the conductive mechanism has been built to explain the resistance change when the gas sensor is exposed to the H2. Hence, the CNT-Co3O4 composite material presents highly promising applications in H2 gas sensing.
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