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Related Experiment Video

Updated: Feb 2, 2026

Brain Mapping Using a Graphene Electrode Array

Brain Mapping Using a Graphene Electrode Array

Published on: October 20, 2023

Secondary-Transferring Graphene Electrode for Stable FOLED.

Yunjie Teng¹, Shoufeng Tong², Min Zhang³

¹College of Opto-Electronic Engineering, Changchun University of Science and Technology, Changchun, 130012, People's Republic of China.

Nanoscale Research Letters

|November 8, 2018

Summary

Sharp wrinkles on graphene films, caused by copper foil grain boundaries, were addressed. A secondary-transferring process smoothed graphene surfaces, enhancing its use in stable flexible organic light-emitting devices (FOLEDs).

Keywords:

Flexible organic light emitting device Graphene Secondary-transferring Sharp winkles

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Area of Science:

Materials Science
Nanotechnology
Surface Science

Background:

Graphene films prepared on copper foil often exhibit sharp wrinkles.
These wrinkles originate from the duplication of copper grain boundary cracks during graphene synthesis.
Surface morphology defects negatively impact graphene's electronic and device applications.

Purpose of the Study:

To explore the formation mechanism of sharp wrinkles on graphene films.
To develop a novel method for smoothing wrinkled graphene surfaces.
To demonstrate the improved performance of graphene in electronic devices after surface modification.

Main Methods:

Investigated wrinkle formation by analyzing graphene grown on copper foil.
Developed a secondary-transferring process to modify graphene surface morphology from "Peak" to "Valley" form.
Evaluated surface morphology and photo-electric properties before and after the secondary-transferring process.

Main Results:

The secondary-transferring process effectively smoothed graphene surface wrinkles with minimal damage.
Fabricated flexible organic light-emitting devices (FOLEDs) using modified single-layer graphene (SLG).
Achieved high performance in FOLEDs, with maximum luminance of 35000 cd/m² and current efficiency of 16.19 cd/A.

Conclusions:

The proposed secondary-transferring method successfully mitigates graphene wrinkles caused by substrate defects.
This technique significantly enhances the stability and performance of graphene-based devices like FOLEDs.
The method is suitable for scalable, high-quality graphene production via roll-to-roll manufacturing.