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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
Published on: April 21, 2016
Improving nanowire sensing capability by electrical field alignment of surface probing molecules
Chia-Jung Chu1, Chia-Sen Yeh, Chun-Kai Liao
1Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, 10608, Taiwan.
Nano Letters
|May 3, 2013
Summary
Ordered molecular monolayers enhance nanowire sensor reliability and sensitivity. Electrical field alignment improves structure ordering, leading to highly sensitive DNA hybridization (0.1 fM) and alcohol detection (0.5 ppm) sensors.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Nanowire-based field-effect sensors offer high sensitivity but require optimized molecular interactions for reliable performance.
- The structural arrangement of molecular layers significantly impacts sensor efficiency and signal transduction.
Purpose of the Study:
- To investigate the role of structure ordering in self-assembled molecular monolayers for enhancing nanowire sensor performance.
- To develop and apply electrical field alignment techniques for optimizing molecular layer structure.
- To demonstrate the improved sensitivity and reliability of nanowire sensors using aligned molecular complexes.
Main Methods:
- Fabrication of nanowire-based field-effect sensors.
- Self-assembly of probing molecular monolayers.
- Application of electrical field alignment to improve molecular structure ordering.
- Testing sensor performance for DNA hybridization and alcohol detection.
Main Results:
- Electrical field alignment effectively improved the structure ordering of molecular monolayers.
- Achieved high sensitivity for 15-base single-strand DNA molecule hybridization detection at 0.1 femtomolar (fM).
- Demonstrated high sensitivity for alcohol detection at 0.5 parts per million (ppm).
- Confirmed sensor reliability through repeated tests on multiple nanowire sensors.
Conclusions:
- Structure ordering of molecular monolayers is critical for the reliability and sensitivity of nanowire sensors.
- Electrical field alignment is a viable method to enhance molecular ordering in sensor applications.
- The developed technique significantly improves the performance of nanowire-based sensors for molecular detection.
