Flexible self-supported laser-induced graphene (LIG) electrode devices were facilely fabricated through laser ablation technique by employing commercial polyimide film as the precursor material. Compared with the widely used traditional glassy carbon electrodes, the resulted LIG electrodes displayed abundant porous structure and surface defects. Notably, the onestep yielded LIG electrode devices were endowed with large electrochemically active surface area and accelerated electron transfer ability. Benefiting from its superior electrochemical property, these unmodified LIG electrodes exhibited remarkable enhanced electrochemical oxidation reactivity toward the food additive molecule Allura Red. Based on the augmented oxidation signal of Allura Red molecules on the LIG electrodes, a novel electrochemical sensor with high sensitivity for the detection of Allura Red was successfully developed. The sensor demonstrated a linear detection range spanning from 5 nM to 1 μM and exhibited a detection limit as low as 2.5 nM. Besides, the sensitivity was calculated to be 240.62 μA μM−1 cm− 2. More importantly, the sensor manifested outstanding stability, reproducibility, and practicality, further emphasizing its potential for real-world application.

Flexible self-supporting laser-induced graphene electrode devices for highly sensitive electrochemical analysis of Allura Red
    Abstract
    1 Introduction
    2 Experimental section
        2.1 Reagents and materials
        2.2 Preparation of laser-induced graphene electrode devices
        2.3 Electrochemical analysis procedures
    3 Results and discussion
        3.1 Structure characterization of LIG electrode
        3.2 Electrochemical property of LIG electrode
        3.3 Fabrication of LIG electrode-based electrochemical sensor
    4 Conclusions
    Acknowledgements 
    References

• Yanhong Zeng(Yueyang Vocational Technical College, Yueyang 414000, China)
• Yong Tang(Department of Hepatobiliary Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China)
• Tian Gan(College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China)
• Can Wu(College of Health Science and Engineering, Hubei University, Wuhan 430062, China, Hubei Jiangxia Laboratory, Wuhan 430299, China) Corresponding author