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Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

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Published on: November 27, 2015

Chemoelectronic circuits based on metal nanoparticles.

Yong Yan¹, Scott C Warren^2,3, Patrick Fuller⁴

¹CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.

Nature Nanotechnology

|March 15, 2016

Summary

Researchers developed novel chemoelectronic circuits using metal nanoparticles and charged organic ligands. These circuits enable electronic devices to sense and process chemical signals with high sensitivity and low power consumption.

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Area of Science:

Materials Science
Nanotechnology
Electronics

Background:

Non-silicon materials and nanoparticles offer unique properties for advanced electronic devices.
Metal nanoparticles have unique optical and catalytic properties but are limited in electronic circuitry due to electric field screening.
Existing applications of nanoparticles include solar cells, transistors, photodetectors, plasmonics, and energy conversion.

Purpose of the Study:

To demonstrate the feasibility of creating electronic circuits exclusively from metal nanoparticles.
To explore the use of charged organic ligands to overcome electric field screening in metal nanoparticle systems.
To develop 'chemoelectronic' devices capable of sensing, processing, and reporting chemical signals.

Main Methods:

Fabrication of electronic circuits using metal nanoparticles functionalized with charged organic ligands.
Utilizing ionic gradients of mobile counterions to control electronic currents in 'jammed' nanoparticle systems.
Interfacing nanoparticle electronic elements with sensing nanoparticles for environmental detection.

Main Results:

Demonstrated simple electronic circuits made entirely from functionalized metal nanoparticles.
Showcased current control via ionic gradients surrounding jammed nanoparticles.
Developed chemoelectronic devices capable of sensing humidity, gases, and cations with high sensitivity (parts-per-trillion).

Conclusions:

Metal nanoparticle-based chemoelectronic circuits offer a new paradigm for electronic devices.
These circuits exhibit fast switching times, low power consumption (microwatts), mechanical flexibility, and 'green' fabrication methods.
The technology enables electronic systems to directly sense, process, and report chemical information.