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Metal-Semiconductor Junctions

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Related Experiment Video

Updated: Jun 18, 2026

Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications

Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications

Published on: April 21, 2016

Self-Aligning Nanojunctions for Integrated Single-Molecule Circuits.

Bo Liu¹, Busra Demir^2,3, Caglanaz Akin Gultakti^2,3

¹Biodesign Center for Bioelectronics and Biosensors at Arizona State University, Tempe, Arizona 85287, United States.

|January 12, 2024

Summary

This summary is machine-generated.

Researchers developed a novel method to integrate nanoscale components into electronic circuits using DNA-templated nanojunctions. This high-yield approach enables robust, single-molecule biosensors for detecting specific DNA sequences, like those in SARS-CoV-2.

Keywords:

biosensors carbon nanotubes molecular devices nanoelectronics nanojunction self-alignment single-molecule electronics

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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

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Published on: August 28, 2018

Area of Science:

Nanotechnology
Molecular Electronics
Biosensing

Background:

Integrating nanoscale components (e.g., graphene, nanoparticles, single molecules) with conventional electronics is challenging due to precise contact fabrication requirements.
Current lithographic tools lack the angstrom-level resolution needed for reliable nanoscale connections at manufacturing scales.

Purpose of the Study:

To introduce a scalable, high-yield method for integrating nanoscale devices into electronic circuits.
To create robust, single-molecule electronic biosensors with high specificity.

Main Methods:

A self-aligning, solution-phase process was used to create nanometer-scale gaps between metallic carbon nanotube (mCNT) electrodes.
DNA duplexes were covalently bound to mCNT electrodes to form mCNT-DNA-mCNT nanojunctions, precisely controlling the gap size.
These nanojunctions were integrated with lithographic techniques to form single-molecule circuits.

Main Results:

Achieved yields approaching 50% for integrating nanoscale devices with conventional electronics.
Fabricated nanojunctions exhibited reproducible conductance values dominated by DNA properties.
Demonstrated robust, high-specificity electronic biosensors for dynamic, single-molecule detection of oligonucleotides, including SARS-CoV-2 related sequences.

Conclusions:

The developed DNA-templated nanojunction approach offers a scalable solution for high-yield integration of nanometer-scale devices.
This method facilitates the manufacturing of hybrid electronic systems with applications in advanced biosensing and beyond.