Water-based 2-dimensional anatase TiO₂ inks for printed diodes and transistors

Area of Science:

• Materials Science
• Nanotechnology
• Electronics Engineering

Background:

• Two-dimensional (2D) materials are crucial for printed electronics due to their unique properties and processability.
• Hexagonal boron nitride (h-BN) is a common dielectric but its >1 μm thickness limits low-voltage applications.
• Current h-BN inks derived from liquid-phase exfoliation have broad nanosheet size distributions.

Purpose of the Study:

• To investigate anatase titanium dioxide nanosheets (TiO2-NS) as a printable dielectric material.
• To develop a water-based, printable TiO2-NS ink for low-voltage printed electronic devices.
• To demonstrate the potential of TiO2-NS in sub-micron dielectric layers for printed electronics.

Main Methods:

• Mass-scalable bottom-up synthesis of anatase TiO2 nanosheets.
• Formulation of TiO2-NS into a water-based printable ink.
• Fabrication and characterization of printed diodes and transistors utilizing TiO2-NS dielectric layers.

Main Results:

• TiO2-NS were successfully synthesized via a scalable bottom-up approach.
• A printable, water-based TiO2-NS ink was formulated.
• Sub-micron TiO2-NS dielectric layers were achieved in printed diodes and transistors.

Conclusions:

• Anatase TiO2-NS show significant potential as a dielectric for printed electronics.
• TiO2-NS enable low-voltage applications due to their sub-micron film capability.
• This work validates TiO2-NS as a viable alternative to h-BN for printable dielectrics.