Direct Laser Writing of Transparent Polyimide Film for Supercapacitor.

Fei Huang,Yun Luo,Guoying Feng,Jiajia Yin,Shutong Wang,Li Shen,Sikun Zhou

doi:10.3390/nano10122547

Abstract

Direct laser writing (DLW) is a convenient approach for fabricating graphene-based flexible electronic devices. In this paper, laser-induced graphene was successfully prepared on a thin and transparent polyimide film through the DLW process. Experiments have demonstrated that interdigital thin film capacitor prepared by the DLW method has a high specific capacitance of 8.11 mF/cm2 and volume capacitance density of 3.16 F/cm3 (0.05 mA/cm2) due to the doped fluoride in the laser-induced graphene. The capacitance is about 20 times larger than the super-capacitor based non-transparent polyimide film of the same thickness. Owing to its thin, flexible, higher electrochemical characteristics, the transparent polyimide film is promising for integrating and powering portable and wearable electronics.

Highlights

Flexible electronics show great promise to enable a variety of new applications for energy conversion and storage, food security tags, environmental monitoring, personalized healthcare, and bioinspired soft robotics [1,2,3,4,5]
The Ragone plot (Figure 4j) shows a specific power and energy of supercapacitor preparation from transparent PI and other non-transparent materials, which shows good capacitors performance of this supercapacitor compared with previous materials [18,22,42,43,44]. These results show that supercapacitors made of transparent polyimide film have good capacitance characteristics
Transparent polyimide film has been successfully carbonized by semiconductor laser

Summary

Introduction

Flexible electronics show great promise to enable a variety of new applications for energy conversion and storage, food security tags, environmental monitoring, personalized healthcare, and bioinspired soft robotics [1,2,3,4,5]. A number of materials have been reported to fabricate graphene devices, including lignocellulose [14], lignin [15], phenolic resin [16], polydimethylsiloxane (PDMS) [17], polyether ether ketone (PEEK) [18], polysulfone-class polymers [19], polytetrafluoroethylene (PTFE) [20], polyetherimide (PEI) [21], and polyimide film (PI) [22]. These materials are mainly high-temperature engineering plastics and cross-linked polymers which have better performance in converting into LIG (Laser-Induced Graphene) [23]. The attributes of small size, thin thickness, and flexibility of the device ensures a potential possibility that it can be used to prepare miniaturized, flexible, and wearable supercapacitors

Preparation and Characterizations

Results and Discussions

Electrochemical Performance of the Supercapacitors

Conclusions