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Related Experiment Video

Updated: Jan 8, 2026

Planar and Three-Dimensional Printing of Conductive Inks

Planar and Three-Dimensional Printing of Conductive Inks

Published on: December 9, 2011

Flexible monolithic 3D complementary circuits based on 2D semiconductor inks.

Taoyu Zou¹, Seongmin Heo¹, Youjin Reo¹

¹Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk, Republic of Korea.

Nature Communications

|December 22, 2025

Summary

This summary is machine-generated.

Researchers developed a low-temperature monolithic 3D (M3D) integration method using 2D semiconductor inks. This scalable approach enables high-performance flexible circuits for wearable electronics and bio-integrated systems.

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Last Updated: Jan 8, 2026

Planar and Three-Dimensional Printing of Conductive Inks

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Published on: January 31, 2019

Area of Science:

Materials Science
Electronics Engineering
Nanotechnology

Background:

Flexible and wearable electronics demand high-density, low-power circuits compatible with soft substrates.
Monolithic 3D (M3D) integration with 2D semiconductors offers vertical stacking for compliance, but high-temperature processing limits scalability on flexible materials.

Purpose of the Study:

To present a low-temperature M3D integration strategy for 2D semiconductor inks.
To enable scalable fabrication of compliant, high-performance flexible electronic circuits.

Main Methods:

Utilized a tailored anion-cation doping approach for precise carrier control in n- and p-type 2D semiconductor devices.
Developed a fabrication process entirely below 150°C, including complementary metal-oxide-semiconductor (CMOS) circuits.

Main Results:

Successfully fabricated vertically assembled CMOS circuits, including inverters, logic gates, photosensor-integrated gates, and ring oscillators (ROs).
Achieved a voltage gain of up to 462 in inverters and a maximum oscillation frequency of 13.5 kHz in 5-stage ROs.
Demonstrated robust mechanical stability, conformability to curved surfaces, and excellent skin compatibility of the fabricated circuits.

Conclusions:

The study presents a scalable, low-temperature platform for M3D electronics fabrication.
This technology is suitable for wearable low-power neuromorphic computing and bio-integrated electronic applications.