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Updated: Aug 31, 2025

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

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Flexible iontronics based on 2D nanofluidic material.

Di Wei¹, Feiyao Yang², Zhuoheng Jiang²

¹Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, 101400, Beijing, People's Republic of China. weidi@binn.cas.cn.

Nature Communications

|August 24, 2022

Summary

This summary is machine-generated.

Researchers developed an ultrathin osmotic power source using graphene oxide, achieving record energy density. This iontronics device operates in extreme conditions, paving the way for self-powered electronics.

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Area of Science:

Iontronics
Nanofluidics
Energy Harvesting

Background:

Iontronics studies electron-ion interactions vital for science.
Osmotic power sources convert ion gradients to electricity but suffer from low power output and environmental sensitivity.
Existing osmotic devices struggle with humidity and freezing temperatures.

Purpose of the Study:

To develop an improved osmotic power source with high energy density and stability.
To explore the potential of 2D nanofluidic graphene oxide materials for energy generation.
To create a self-powered device for implantable electronics and human-machine interfaces.

Main Methods:

Fabrication of an ultrathin osmotic power source using 2D nanofluidic graphene oxide.
Integration with a triboelectric nanogenerator to form a self-charged device.
Development of a 3D aerogel structure to enhance areal power density.

Main Results:

Achieved record voltage (1.5 V), volumetric specific energy density (6 mWh cm⁻³), and power density (28 mW cm⁻³).
Demonstrated operation under extreme conditions (-40 °C) and overcame humidity limitations.
Scaled up areal power density to 1.3 mW cm⁻² using a 3D aerogel.

Conclusions:

The developed graphene oxide-based osmotic power source offers superior performance and environmental resilience.
This technology enables self-powered, conformable devices for advanced applications like implantable electronics.
Nanoconfined enhancement in graphene oxide is key to overcoming limitations of traditional ion gradient energy harvesting.