Origami nanogap electrodes for reversible nanoparticle trapping.

Area of Science:

• Materials Science
• Nanotechnology
• Microfluidics

Background:

• Traditional methods for creating nanogap devices often involve complex and expensive lithographic techniques.
• Developing facile and scalable fabrication methods for nanodevices is crucial for their widespread application.

Purpose of the Study:

• To present a simplified desktop fabrication method for origami-based nanogap indium tin oxide (ITO) electrokinetic particle traps.
• To demonstrate the effective trapping of nanoparticles using these novel nanogap structures.

Main Methods:

• Fabrication of nanogap ITO electrodes by bending ITO thin films on PET substrates.
• Controlled introduction of nanocracks using cut-sharp edges to form nanogaps.
• Analysis of trapping conditions and electrode performance using optical microscopy and electrokinetic impedance spectroscopy.

Main Results:

• Successful creation of an array of parallel nanogaps through controlled nanocracking.
• Demonstrated effective trapping of small nanoparticles within the nanogaps under alternating electric potential.
• Identified conditions for reversible trapping and optimal performance of the nanogap ITO electrodes.

Conclusions:

• The facile desktop fabrication method offers a simplified alternative to traditional lithography for creating nanogap ITO particle traps.
• These origami-based nanogap ITO electrodes show significant potential for use in active electro-actuated traps within microfluidic systems.