Room-temperature Ferromagnetic All-carbon Films Based on Reduced Graphene Oxide

doi:10.15541/jim20240374

Abstract

Abstract:

Nano carbon materials with ferromagnetism have significant application value in fields such as spintronics, biomedical imaging, electrodes, and dye adsorption. Graphene derivatives graphene oxide (GO) and reduced graphene oxide (rGO) exhibit excellent physical and chemical properties, presenting a room temperature ferromagnetic ordered structure. In order to achieve large-scale, low-cost, and stable performance of all-carbon films, a dual dimensional carbon composite strategy combining thermal reduction was adopted to prepare composite films of micro reduced graphene oxide fibers (rGOFs) and nano scale rGO sheets, and the ferromagnetic mechanism of all-carbon films was explained partially. This work prepared rGO-rGOFs all-carbon composite films with different masses of rGOFs, focusing on the ferromagnetic mechanism and magnetoresistance effect of the materials. The research results find that introducing a certain amount of rGOFs can increase the room temperature saturation magnetization of rGO films from 0.0083 to 0.0960 A·m²·kg^-1. Enhancement of the ferromagnetism is achieved through combined effect of vacancy type defects and sp³(C-C) states in carbon film. Interference of metal impurities in the sample, which may affect the saturation magnetization, is eliminated by inductively coupled plasma mass spectrometry. In addition, at room temperature and ±1 T magnetic field, the magnetoresistance (MR) curve shows MR value of sample is negative. By regulating the surface topology and sp³(C-C)/sp²(C=C) ratio of the material, the room temperature saturation magnetization has been improved to a higher extent. In short, this new type of all-carbon thin film is expected to be applied to spintronic devices and biomedical fields in the near future.

Key words: all-carbon composite film, reduced graphene oxide fiber, room-temperature ferromagnetism, magnetoresistance effect

CLC Number:

O441

WANG Yue, WANG Xin, YU Xianli. Room-temperature Ferromagnetic All-carbon Films Based on Reduced Graphene Oxide[J]. Journal of Inorganic Materials, 2025, 40(3): 305-313.

Figures/Tables 6

Fig. 1 SEM images of samples (a) rGO, (b) rGO-rGOFs10, (c) rGO-rGOFs20 and (d) rGO-rGOFs100; (c-1, c-2) rGO-rGOFs20 at different magnifications

Fig. 2 Characterizations of structure and chemical composition of sample (a) XRD patterns; (b) Raman spectrum of rGO-rGOFs20; (c) Intensity and area ratios; (d) FT-IR spectra; (e) C1s XPS spectrum of rGO-rGOFs20; (f) sp3/sp2(C-C, C-O, C=O, and -COOH contributing to the sp3 carbon, while C=C contributing to the sp2 carbon) and C-OH/C-O-C area ratios. Colorful figures are available on website

Fig. 3 Magnetic properties of samples (a) M-H curves; (b) Saturation magnetization intensity; (c) FC and ZFC curves of rGO-rGOFs20; (d) Contents of the selected metal impurities in GO. Colorful figures are available on website

Fig. 4 Magnetoresistance properties of samples at room temperature and ±1 T magnetic field (a) Variation of resistance with magnetic field; (b) Magnetoresistance values of samples

Fig. S1 XPS C1s (a) and O1s (b) spectra of samples GO, rGO, rGO-rGOFs10, rGO-rGOFs20, and rGO-rGOFs100

Fig. S2 M-H curves of CF (7 μm in diameter and 80 μm in length) and rGO-CF

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