Related Experiment Video
Updated: Oct 29, 2025
11:44
Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
Published on: March 20, 2015
20.8K
Engineering Electromagnetic Hot-Spots in Nanoparticle Cluster Arrays on Reflective Substrates for Highly Sensitive
Rishabh Rastogi1,2, Ekoue A Dogbe Foli2, Remi Vincent2
1MRT Department, Luxembourg Institute of Technology, 41, Rue du Brill, Belvaux L-4422, Luxembourg.
ACS Applied Materials & Interfaces
|July 9, 2021
Summary
Gold nanoparticle cluster arrays create electromagnetic hot-spots for ultrasensitive detection of small and large molecules in biosensing applications. This self-assembly approach enhances sensitivity for molecular detection using plasmonic biosensors.
Area of Science:
- Plasmonics and Nanotechnology
- Biosensing
- Surface Chemistry
Background:
- Electromagnetic (EM) hot-spots in plasmonic nanoparticle assemblies enhance molecular detection sensitivity.
- Accessing these hot-spots is challenging for large biomolecules.
Purpose of the Study:
- To demonstrate self-assembly derived gold nanoparticle cluster arrays (NCAs) for controlled hot-spot generation.
- To investigate the impact of NCA structure and substrate on analyte detection sensitivity.
Main Methods:
- Fabrication of gold nanoparticle cluster arrays (NCAs) on gold substrates using self-assembly.
- Utilizing surface-enhanced Raman spectroscopy (SERS) and metal-enhanced fluorescence (MEF) assays.
- Employing numerical simulations to analyze EM field enhancements.
Main Results:
- NCAs exhibited controlled interparticle (<1 nm) and intercluster (<10 nm) hot-spots.
- Analyte sensitivity was influenced by cluster size and substrate reflectivity.
- Achieved picomolar detection limits for both small organic and large protein analytes.
Conclusions:
- Self-assembly derived NCAs provide effective EM hot-spots for sensitive molecular detection.
- Analyte leverage over hot-spots and EM field enhancement are key to sensitivity.
- This approach enables rational design of plasmonic biosensors for diverse analytes.
