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Cellulose surface modification for improved attachment of carbon nanotubes
Cellulose ( IF 5.7 ) Pub Date : 2022-06-08 , DOI: 10.1007/s10570-022-04640-4
Madalina Elena Culica , Razvan Rotaru , Dana Bejan , Adina Coroaba , Tamilselvan Mohan , Sergiu Coseri

This paper addresses an important issue related to improving the compatibility of the components when aiming to obtain composite materials with special properties. Thus, we designed and successfully prepared and characterized new materials based on multiwalled carbon nanotubes (MWCNTs) which are more efficiently and stably attached to viscose fibers, materials that may achieve semiconductive properties. The modification of the cellulosic fibers was performed by a selective oxidation reaction with sodium periodate, a process that ensures the formation of aldehyde groups onto the fibers surface, whereas the MWCNTs were modified by a two-step reaction, aiming at obtaining functionalized MWCNTs bearing HN2 moieties. Meantime, two reference samples were additionally prepared for comparative purposes, combining one non-functionalized component with a functionalized one at a time. All samples were thoroughly characterized by FTIR and Raman spectroscopy, X-ray diffraction spectroscopy, while the morphology of the resulted composites was assessed by scanning electron microscopy (SEM). Thermal properties of the starting materials, functionalized components, and their corresponding hybrid materials were evaluated by thermogravimetric analysis. Electrical behavior of the raw and modified fibers and the both functionalized components was assessed. They exhibited low values of the contact resistance (10−4 MΏ) over the entire frequency range analyzed, as well as high values of field effect mobility, between 1.01 and 0.14 cm2 V−1 s in the frequency range 10−1–106 Hz.



中文翻译:

纤维素表面改性以改善碳纳米管的附着

本文讨论了在获得具有特殊性能的复合材料时与提高组分相容性相关的一个重要问题。因此,我们设计并成功制备和表征了基于多壁碳纳米管 (MWCNT) 的新材料,这些材料更有效、更稳定地附着在粘胶纤维上,这些材料可以实现半导体性能。纤维素纤维的改性是通过与高碘酸钠的选择性氧化反应进行的,该过程确保在纤维表面形成醛基,而多壁碳纳米管通过两步反应进行改性,旨在获得带有 HN 的功能化多壁碳纳米管2部分。同时,为了比较的目的,另外制备了两个参考样品,一次将一种非功能化组分与一种功能化组分组合。所有样品均通过 FTIR 和拉曼光谱、X 射线衍射光谱进行了全面表征,而所得复合材料的形态通过扫描电子显微镜 (SEM) 进行了评估。通过热重分析评估起始材料、功能化组件及其相应的杂化材料的热性能。评估了原始纤维和改性纤维以及两种功能化组分的电性能。它们表现出较低的接触电阻值(10 -4 MΏ) 在所分析的整个频率范围内,以及在 10 -1 –10 6  Hz频率范围内 1.01 和 0.14 cm 2  V -1  s之间的高场效应迁移率值。

更新日期:2022-06-08
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