Preparation and Performance of Reduced Graphene Oxide Functionalized Flexible and Multicolor Electrothermal Chromatic Films

doi:10.15541/jim20180054

Abstract

Abstract:

By using a chemical oxidation-reduction method, reduced graphene oxide (RGO) nanomaterials were synthesized. The powder materials were further dispersed in water and filtered to form a RGO film, which was used as a conductive layer. On the other side of the filter paper, a color changing layer was prepared through screen printing. A multicolor (red-blue-white and orange-yellow-white, etc.) and flexible electrothermal chromatic film was then obtained through combining conductive and color changing layers with protecting substrates. The structural properties of the film (red-blue-white) were analyzed by using SEM, XRD and Raman, etc. Their thermal and color-changing properties were studied by using infrared thermal imaging and absorption spectrum. The results show that when surface temperature of the film reaches 38℃ (within 3.4 s under Joule heat treatment at ambient conditions), it turns blue. Further heating to 45℃ (within 6.3 s under Joule heat treatment), it turns white. The multi-color changes are achieved at low working voltage (6 V). After switching off the voltage, the film restores its original color within 9.2 s. The electrothermal chromatic films have good flexibility too, therefore, they might be applied in wearable displays.

Key words: RGO, flexible, multicolor, electrothermal chromatic

CLC Number:

TQ174

ZHANG Bin, HOU Cheng-Yi, WANG Hao-Peng, WANG Zhi-Qiang, BAI Yu-Miao, LI Qiang, ZHANG Qing-Hong, LI Yao-Gang, WANG Hong-Zhi. Preparation and Performance of Reduced Graphene Oxide Functionalized Flexible and Multicolor Electrothermal Chromatic Films[J]. Journal of Inorganic Materials, 2018, 33(11): 1232-1236.

Figures/Tables 8

Fig. 1 XRD patterns (a) and Raman spectra (b) of GO and RGO

Fig. 2 Schematic illustration of the flexible electrothermal chromatic films

Fig. 3 Cross-sectional SEM image (a) and photograph (b) of the flexible conductive film

Fig. 4 SEM image of RGO

Fig. 5 Photographs of the flexible electrothermal chromatic film during a color-change cycle under an applied voltage of 6 V

Fig. 6 Thermal images of the flexible electrothermal chromatic film during a cycle under an applied voltage of 6 V

Fig. 7 Temperature-time curves of the flexible electrothermal chromatic film under a current voltage of 6 V

Fig. 8 Absorbance spectra (a) and response time (b) of the flexible electrothermal chromatic film

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