Effect of Sample Geometry on Graphitization of Polyacrylonitrile

Author:

Hwang Young Woo12,Shin Tae Joo3,Seo Jae Hong14,Kim Min Hyeok14,Lee Won Jun2,Ruoff Rodney S.1456,Seong Won Kyung1,Lee Sun Hwa1ORCID

Affiliation:

1. Center for Multidimensional Carbon Materials Institute for Basic Science (IBS) Ulsan 44919 Republic of Korea

2. Department of Fiber System Engineering Dankook University Yongin 16890 Republic of Korea

3. Graduate School of Semiconductor Materials and Devices Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea

4. Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea

5. School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea

6. Department of Materials Science and Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea

Abstract

AbstractIn this study, it is analyzed how sample geometry (spheres, nanofibers, or films) influences the graphitization behavior of polyacrylonitrile (PAN) molecules. The chemical bonding and changes in the composition of these three geometries are studied at the oxidation, carbonization, and graphitization stages via scanning electron microscopy (SEM), in situ thermogravimetric‐infrared (TGA‐IR) analysis, elemental analysis, Raman spectroscopy, and X‐ray photoelectron spectroscopy (XPS). The influence of molecular alignment on the graphitization of the three sample geometries is investigated using synchrotron wide‐angle X‐ray diffraction (WAXD) and transmission electron microscopy (TEM). The effects of molecular alignment at different draw rates during spinning are explored in detail.

Funder

Institute for Basic Science

Publisher

Wiley

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