材料科学
热导率
氧化物
热传导
导电体
光电子学
作者
Simon Hettler,David Sebastian,Mario Pelaez-Fernandez,Ana M. Benito,Wolfgang K. Maser,Raul Arenal
出处
期刊:arXiv: Mesoscale and Nanoscale Physics
日期:2021-04-14
被引量:1
标识
DOI:10.1088/2053-1583/abedc9
摘要
Graphene oxide (GO) is reduced by Joule heating using in-situ transmission electron microscopy (TEM). The approach allows the simultaneous study of GO conductivity by electrical measurements and of its composition and structural properties throughout the reduction process by TEM, electron diffraction and electron energy-loss spectroscopy. The small changes of GO properties observed at low applied electric currents are attributed to the promotion of diffusion processes. The actual reduction process starts from an applied power density of about 2 1014 Wm-3 and occurs in a highly uniform and localized manner. The conductivity increases more than 4 orders of magnitude reaching a value of 3 103 Sm-1 with a final O content of less than 1%. We discuss differences between the reduction by thermal annealing and Joule heating.
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