Functionalization of multiwalled carbon nanotubes with uniform polyurea coatings by molecular layer deposition |
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| Affiliation: | 1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan 030001, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;1. Department of Health Sciences, University of Catanzaro Magna Graecia, Catanzaro, Italy;2. Department of Veterinary Medicine and Animal Productions, University of Naples “Federico II”, Naples, Italy;3. Department of Economics, University of Genoa, Genoa, Italy;4. Department of Statistics, Informatics and Applications “G. Parenti”, University of Florence, Florence, Italy;5. Biostatistics Unit, ISPO, Florence, Italy;1. Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi’an 710062, China;2. College of Chemistry & Chemical Engineering, Xianyang Normal University, Xianyang 712000, China;1. Department of Physics, Institute of Low-dimensional Carbons and Device Physics, Shanghai University, Shanghai 200444, China;2. Department of Chemistry and Institute for Advanced Research, Nagoya University, Nagoya 464-8602, Japan;3. International Centre for Quantum and Molecular Structures, Shanghai University, Shanghai 200444, China;1. College of Science, Shanghai University, Shanghai 200444, PR China;2. Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nanotech and Nanobionics, Chinese Academy of Science, Suzhou 215123, PR China;3. Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, PR China;1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In this study, we demonstrate a flexible method for functionalizing multiwalled carbon nanotubes (MWCNTs) with polyurea (PU) coatings using molecular layer deposition (MLD). Uniform and conformal PU films can be deposited on the surface of pristine MWCNTs without any surface treatment. The PU shell thickness and wrapping amount are precisely tunable by changing the number of MLD cycles. The present MLD functionalizing treatment provides better dispersion of the MWCNTs in highly polar solvents such as N,N-dimethylformamide, dimethyl sulfoxide, and 1-methyl-2-pyrrolidinone. Furthermore, the PU layers improve the compatibility between MWCNTs and the polyurethane matrix. Significant increases in tensile strength and modulus are obtained, resulting in greatly enhanced mechanical properties of PU-functionalized MWCNT/polyurethane composites. |
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