Laser-Induced Graphene-based Flexible Substrate with Photothermal Conversion and Photoresponse Performance on...

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Graphene-based flexible electronic devices are crucial for photoelectric components and photodetectors.
• Efficient and economical fabrication of these devices remains a significant challenge.
• Laser direct writing offers a promising alternative for fabricating flexible graphene substrates.

Purpose of the Study:

• To develop an efficient and economical method for fabricating graphene-based flexible substrates (GFS) using laser direct writing.
• To investigate the optical and photoresponse properties of laser-induced GFS and carbon nanoparticle-decorated GFS (GFSC).
• To explore the potential applications of GFS and GFSC in flexible photodetectors and sensors.

Main Methods:

• Fabrication of GFS by CO2 laser direct writing on polyimide (PI) film.
• Further surface modification of GFS with carbon nanoparticles (GFSC) using femtosecond (fs) laser reprocessing.
• Characterization of electrical resistance, optical absorptivity, photothermal conversion, and photoresponse performance.

Main Results:

• GFS with a resistance of 15 Ω and GFSC with 25 Ω were successfully fabricated in one step.
• GFS exhibited absorptivity up to 90% (200-2000 nm), enhanced to 97.5% for GFSC.
• GFSC reached a surface temperature of 70.8 °C under 1 sun irradiation and showed stable photoresponse.

Conclusions:

• Laser direct writing provides an efficient and economical route for GFS fabrication.
• The porous graphene structure and carbon nanoparticles significantly enhance light absorption and photothermal properties.
• GFS and GFSC demonstrate considerable potential for flexible photodetector and sensor applications.