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Updated: May 20, 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

Step-gate polysilicon nanowires field effect transistor compatible with CMOS technology for label-free DNA biosensor.

G Wenga¹, E Jacques, A-C Salaün

¹Institut d'Electronique et de Télécommunications de Rennes (IETR), UMR CNRS 6164, Université de Rennes 1, 35000 Rennes, France.

Biosensors & Bioelectronics

|July 31, 2012

Summary

Researchers developed low-cost silicon nanowire sensors for ultrasensitive DNA hybridization detection. These novel electronic sensors achieve a 1 femtomolar detection limit, offering a promising alternative to expensive fluorescence methods.

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Area of Science:

Nanotechnology
Biotechnology
Electrical Engineering

Background:

Current DNA hybridization detection relies on expensive optical systems and complex bioinformatics.
There is a need for low-cost, direct, and highly sensitive DNA detection devices.
Silicon nanowires offer high surface-to-volume ratios, making them suitable for ultrasensitive electrical biosensing.

Purpose of the Study:

To develop innovative, low-cost devices for ultrasensitive electronic detection of DNA hybridization.
To utilize step-gate polycrystalline silicon nanowire field-effect transistors (poly-Si NW FETs) as DNA sensors.
To demonstrate the feasibility of CMOS-compatible nanowire-based DNA sensing.

Main Methods:

Fabrication of step-gate polycrystalline silicon nanowire FETs using a simple and low-cost process.
Synthesis of poly-SiNWs via the sidewall spacer formation technique.
Testing the NW FET sensors for DNA hybridization detection using complementary and no-complementary sequences.

Main Results:

Successfully fabricated and characterized step-gate poly-Si NW FETs.
Demonstrated clear discrimination between complementary and no-complementary DNA sequences.
Achieved an ultrasensitive detection limit in the 1 femtomolar (fM) range for DNA hybridization.

Conclusions:

The developed poly-Si NW FETs are effective ultrasensitive electronic sensors for DNA hybridization.
This technology offers a promising pathway for developing low-cost, CMOS-compatible DNA sensors.
The results pave the way for advanced molecular diagnostics and biosensing applications.