Formation of uniform reduced graphene oxide films on modified PET substrates using drop-casting method--颗粒学报PARTICUOLOGY

Zhao, C., Xing, L., Xiang, J., Cui, L., Jiao, J., Sai, H., Li, Z., & Li, F. (2014). Formation of uniform reduced graphene oxide films on modified PET substrates using drop-casting method. Particuology, 17, 66–73. https://doi.org/10.1016/j.partic.2014.02.005

Formation of uniform reduced graphene oxide films on modified PET substrates using drop-casting method

Chunlin Zhao ^a, Li Xing ^a, Junhui Xiang ^a *, Lijie Cui ^b, Jianbin Jiao ^c, Huazheng Sai ^a, Zhenyou Li ^a, Fei Li ^a

a College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China b College of Chemistry and Chemical Engineering, University of the Chinese Academy of Sciences, Beijing 100049, China c College of Engineering and Information Technology, University of the Chinese Academy of Sciences, Beijing 100049, China

10.1016/j.partic.2014.02.005

Volume 17, December 2014, Pages 66-73

Received 20 December 2013, Revised 21 February 2014, Accepted 28 February 2014, Available online 16 April 2014.

E-mail: xiangjh@ucas.ac.cn

Highlights

• Drop-casting method was used to prepare reduced graphene oxide transparent and conductive films.

• Four types of PET substrates with or without modification were investigated.

• Uniform and continuous RGO films were deposited on polydopamine-coated PET substrate.

• The prepared RGO film exhibited a sheet resistance of 21.75 kΩ/sq at 82% transmittance.

Abstract

In this work, uniform reduced graphene oxide (RGO) films were formed on poly-(ethylene terephthalate) (PET) substrates using a simple drop-casting method. We investigated four types of substrates: unmodified PET, polydopamine-coated PET, carboxyl-group-modified PET, and alkyl-group-modified PET. Upon water evaporation, the surface of the polydopamine-modified PET substrates can interact with the reduced graphene oxide sheets to form flattened and continuous RGO films, which exhibit a sheet resistance of 21.75 kΩ/sq at 82% transmittance. The result indicates that the properties of the surface groups determined whether uniform and flattened RGO films could be formed on the substrates. Hence, we proposed a simple and effective way to produce transparent and conductive films in which the catechol unit exhibits a great effect on the deposition of uniform RGO films on PET substrates.

Graphical abstract

Keywords

Reduced graphene oxide; Modified PET substrates; Drop-casting; Polydopamine; Transparent conductive films

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