Printed Graphene Derivative Circuits as Passive Electrical Filters

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Traditional electronic components often rely on rigid substrates and complex manufacturing.
• Developing flexible and printable electronic components is crucial for next-generation devices.
• Graphene-based inks offer potential for novel conductive and functional materials.

Purpose of the Study:

• To inkjet print resistor-capacitor (RC) low pass electrical filters using a novel water-based cellulose graphene ink.
• To compare the electrical performance of printed RC filters with those made from discrete passive components.
• To investigate the effect of mechanical stress on the performance of flexible printed circuits.

Main Methods:

• Synthesis of a non-toxic graphene-carboxymethyl cellulose (G-CMC) ink.
• Inkjet printing of first-order and second-order low-pass RC filters on flexible polyimide substrates.
• Characterization of filter parameters including time constant, cut-off frequency, and roll-off rate.
• Evaluation of voltage-frequency and transient behavior, and impact of mechanical bending.

Main Results:

• The synthesized G-CMC ink was successfully deposited using a customized inkjet printer.
• Printed RC filters demonstrated comparable performance to discrete component circuits for low-frequency (<100 kHz) applications.
• Both low-pass filter and RC integrator functionalities were achieved with the printed circuits.
• The study assessed the influence of mechanical bending on the electrical characteristics of the flexible printed filters.

Conclusions:

• Inkjet-printed graphene-cellulose composite filters are a viable alternative to discrete components for low-frequency applications.
• Flexible printed electronics using novel inks offer promising solutions for adaptable and integrated circuits.
• Further research can explore higher frequency applications and advanced functionalities for these printed circuits.