Graphene Nanosheets Prepared by Arc Discharge Method and Their Application in Conductive Inkjet

doi:10.15541/jim20160189

Abstract

Abstract:

Conductive ink is one of the dominant electronic materials for printed electronics technology. As the main component in conductive inks, conductive fillers are required to have favorable electronic properties and good chemical stability. Up to date, graphene-based conductive ink has attracted enormous research interest mainly due to its remarkable electrical properties. In present study, the graphene sheets as the conductive fillers were fabricated via a direct current arc discharge evaporation method. Furthermore, the as-prepared graphene sheets were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and Raman spectra analysis. The results demonstrated that the graphene sheets consisting of 2-10 layers with sheet size ranging from 100 nm to 200 nm had high purity and high crystallinity. Besides, the relationships between conductive properties and coating thicknesses, annealing temperatures and bending angles of conductive ink, were also carried out. It was found that the resistivity of conductive ink was inversely proportional to its thickness and annealing temperature, i.e. with gradual increase in thickness and temperature, the resistivity was decreased. And the resistivity of the conductive ink on the flexible substrate remained stable under different folding angles. Specially, the conductive ink with a thickness of 170 μm achieved the specific resistivity of 0.003 Ω•cm after being annealed at 360℃ for 30 min. The results indicate that arc-discharge graphene sheets are promising alternative for next generation of printed electronics.

Key words: graphene sheets, arc discharge, conductive ink

CLC Number:

TQ174

YANG Jie, PAN Zheng-Hui, SHENG Lei-Mei, AN Kang, ZHAO Xin-Luo. Graphene Nanosheets Prepared by Arc Discharge Method and Their Application in Conductive Inkjet[J]. Journal of Inorganic Materials, 2017, 32(1): 39-44.

Figures/Tables 4

Fig. 1 (a) SEM and (b) TEM images of arc-discharge graphene sheets prepared by arc discharge evaporation; (c-e) HRTEM images of graphene sheets with 5, 8 and 9 layers taken from region A, B and C in Fig. 1(b), respectively

Fig. 2 Raman spectra of a few layer graphene sheets prepared by arc discharge evaporation(a) Typical Raman spectrum of graphene sheets; (b) D/G peak ratio mapping; (c) G/2D peak ratio mapping; (d) FWHM Raman mapping

Fig. 3 Raman spectra of graphene conductive ink with (a) different thicknesses and (b) being annealed at different temperatures

Fig. 4 (a) Picture of graphene conductive ink after being laid for 30 d, Relationship between resistivity and thickness(b), annealing temperature(c) (The insert showing thermogravimetric analysis (TGA) of ethyl cellulose (EC)), and bending angle (d) of graphene conductive ink

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