Leyva-Porras César, Ornelas-Gutiérrez C, Miki-Yoshida M, Avila-Vega Yazmín I, Macossay Javier, Bonilla-Cruz José
Centro de Investigación en Materiales Avanzados S. C. (CIMAV-Unidad Monterrey), Av. Alianza Norte # 202, Autopista Monterrey-Aeropuerto Km 10, PIIT, Apodaca, N. L., México, C.P. 66600 ; Centro de Investigación en Materiales DIP-CUCEI, Universidad de Guadalajara, Av. Revolución # 1500, Col. Olímpica, Guadalajara, México. C.P. 44430.
Centro de Investigación en Materiales Avanzados S.C. (CIMAV) and Laboratorio Nacional de Nanotecnología. Miguel de Cervantes # 120. Complejo Industrial Chihuahua, Chihuahua, Chih. México. 31109.
Carbon N Y. 2014;70:164-171. doi: 10.1016/j.carbon.2013.12.087.
A detailed analysis by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) of nitroxide-functionalized graphene oxide layers (GOFT) dispersed in Nylon 6 nanofibers is reported herein. The functionalization and exfoliation process of graphite oxide to GOFT was confirmed by TEM using electron diffraction patterns (EDP), wherein 1 to 4 graphene layers of GOFT were observed. The distribution and alignment of GOFT layers within a sample of Nylon 6 nanofiber reveals that GOFT platelets are mainly within the fiber, but some were partially protruding from it. Furthermore, Nylon 6 nanofibers exhibit an average diameter of 225 nm with several microns in length. GOFT platelets embedded into the fiber, the pristine fiber, and amorphous carbon were analyzed by EELS where each spectra [corresponding to the carbon edge (C-K)] exhibited changes in the fine structure, allowing a clear distinction between: i) GOFT single-layers, ii) Nylon-6 nanofibers, and iii) the carbon substrate. EELS analysis is presented here for the first time as a powerful tool to identify functionalized graphene single-layers (< 4 layers of GOFT) into a Nylon 6 nanofiber composite.
本文报道了通过透射电子显微镜（TEM）和电子能量损失谱（EELS）对分散在尼龙6纳米纤维中的氮氧化物功能化氧化石墨烯层（GOFT）进行的详细分析。通过TEM利用电子衍射图谱（EDP）证实了氧化石墨到GOFT的功能化和剥离过程，其中观察到GOFT有1至4层石墨烯层。GOFT层在尼龙6纳米纤维样品中的分布和排列表明，GOFT薄片主要在纤维内部，但有些部分从纤维中突出。此外，尼龙6纳米纤维的平均直径为225纳米，长度为几微米。通过EELS对嵌入纤维中的GOFT薄片、原始纤维和无定形碳进行了分析，其中每个光谱[对应于碳边缘（C-K）]在精细结构上都表现出变化，从而能够清晰地区分：i）GOFT单层，ii）尼龙-6纳米纤维，以及iii）碳基底。EELS分析首次作为一种强大的工具，用于识别尼龙6纳米纤维复合材料中的功能化石墨烯单层（<4层GOFT）。
