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Colorimetric plasmon sensors with multilayered metallic nanoparticle sheets
Shuhei Shinohara1, Daisuke Tanaka, Koichi Okamoto
1Institute for Materials Chemistry and Engineering, Kyushu University, Motooka Nishi-ku Fukuoka, 819-0395, Japan. tamada@ms.ifoc.kyushu-u.ac.jp.
Physical Chemistry Chemical Physics : PCCP
|June 27, 2015
Summary
This study presents a novel colorimetric plasmon sensor using layered silver and gold nanoparticles for sensitive, naked-eye detection of molecular binding events. The sensor shows a significant color change, indicating its potential for simple diagnostic systems.
Area of Science:
- Nanotechnology
- Plasmonics
- Biosensing
Background:
- Colorimetric plasmon sensors offer a promising avenue for naked-eye detection of molecular recognition.
- Existing methods require sensitive substrates for accurate detection.
Purpose of the Study:
- To develop a highly sensitive colorimetric plasmon sensor for molecular recognition.
- To investigate the role of layered silver and gold nanoparticles in enhancing sensor performance.
Main Methods:
- Fabrication of 3-layered silver nanoparticle sheets on a gold substrate using the Langmuir-Schaefer method.
- Utilizing avidin-biotin interactions for nanoparticle binding and detection.
- Employing finite-difference time-domain (FDTD) simulations to understand optical properties.
Main Results:
- A drastic color change was observed upon binding of gold nanoparticles at less than 30% surface coverage.
- The color change is attributed to localized surface plasmon resonance (LSPR) and a multiple light trapping effect.
- FDTD simulations corroborated the experimental observations.
Conclusions:
- The developed sensor demonstrates high sensitivity and potential for naked-eye detection.
- Layered plasmonic nanostructures enhance sensor performance through combined LSPR and light trapping.
- This technology holds significant promise for the development of simple and sensitive diagnostic systems.
