Patterned Arrays of Functional Lateral Heterostructures via Sequential Template-Directed Printing.

Area of Science:

• Materials Science
• Nanotechnology
• Microfabrication

Background:

• Precise integration of microscale features is crucial for advanced functional devices.
• Current solution-processing methods struggle with controlling interfacial connections in micropatterns, hindering device performance.

Purpose of the Study:

• To develop a new fabrication strategy for creating arrayed microdots connected by microwires with controllable interfaces.
• To overcome the limitations of existing methods in engineering solution kinetics on microstructures.

Main Methods:

• A sequential template-directed printing process was employed.
• Rayleigh-Taylor instability of material solutions/suspensions was regulated to control fluidic behaviors.
• Fabrication of microdots and microwires with various morphologies and interface connections (traversing, overlapping, connecting).

Main Results:

• Demonstrated precise interface connections between microdots and microwires.
• Achieved diverse microdot (circular, rhombic, star-shaped) and microwire (straight, broken, curved) morphologies.
• Successfully fabricated a dichromatic photoluminescent lateral heterostructure using quantum dots and a rapid-response ammonia gas sensor using polyaniline and silver nanoparticles.

Conclusions:

• The developed printing strategy offers facile construction of heterostructures by eliminating uncertainties in multimaterial interface connections.
• This approach holds significant promise for the development of novel lateral functional devices.