期刊
CARBON
卷 147, 期 -, 页码 236-241出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.02.088
关键词
-
资金
- National Key Research and Development Program of China [2016YFA0203301]
- National Natural Science Foundation of China [11472291]
- Natural Science Foundation of Jiangsu Province [BK20181196]
Carbon nanotube (CNT) films have shown great promise for a wide range of applications such as high-performance composites, energy devices, and environmental protection. However, the mechanical degradation of CNT films under high temperatures caused by their inherent weak oxidation resistance significantly limits their application in high-temperature environments. This paper presents a method for improving the mechanical properties and thermal stability of CNT films using SiO2-coating modification. The SiO2 precursor was first uniformly infiltrated into a CNT film via a vacuum-assisted filtration method. The SiO2 precursor was then decomposed under a controlled temperature to form an amorphous SiO2 layer wrapped on the CNTs. This treatment remarkably enhanced the mechanical performance of the CNT film, with a tensile strength of 180.9 MPa, which was 200% higher than that of the pristine CNT film. The SiO2-modified CNT film also exhibited excellent thermal stability at 500 degrees C, making it possible to expand its usage in high-temperature environments. The mechanism of the enhanced mechanical properties and thermal stability of the SiO2/CNT film is also discussed. (c) 2019 Elsevier Ltd. All rights reserved.
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