
388 Nanosensors: Physical, Chemical, and Biological
TABLE 6.1
Optical Nanosensor Family
Sl.
No. Name of the Nanosensor Nanomaterial Used Operating Principle
Sensed Quantity/
Applications
1. Localized surface plasmon
resonance (LSPR) spectroscopy
Noble-metal nanoparticles Refractive index–based detection:
wavelength shift in the LSPR
extinction or scattering maximum
Chemical and biological
targets
2. Surface-enhanced Raman
scattering (SERS)
Metallic nanostructures LSPR, uorescence, and Raman
spectroscopy
Biosensing applications
3. Colorimetric gold nanoparticle
spectrophotometric sensor
Colloidal gold on an optically
transparent substrate
A colorimetric signal ...