Title: Biosensing based on light absorption of nanoscaled gold and silver particles
Authors: Frederix, Filip ×
Friedt, Jean-Michel
Choi, KH
Laureyn, W
Campitelli, A
Mondelaers, D
Maes, Guido
Borghs, Gustaaf #
Issue Date: Jan-2003
Publisher: Amer chemical soc
Series Title: Analytical chemistry vol:75 issue:24 pages:6894-6900
Abstract: The absorption spectrum of noble metal spherical nanoparticles is known to be strongly influenced by the dielectric constant of the surrounding material, and as such, these particles are well suited for biosensing applications. To perform biosensing using nanoparticles on a substrate, the metal particles are covalently attached onto quartz using an organic adhesion layer of mercaptosilanes. The particles in solution are characterized by UV-vis spectroscopy and transmission electron microscopy, while those attached to the quartz are characterized with UV-vis spectroscopy and atomic force microscopy. Antibodies are attached to the metal nanoparticles, and the antigen recognition is monitored via the change of light absorption when this binding event occurs. Not only is the absorbance originating from plasmon resonances of the particles influenced by the dielectric properties of molecules attached to the nanospheres but also the interband absorption of the particles changes, which will be demonstrated in this report. A light absorption change is detected when a molecular recognition occurs between the bioreceptor molecules attached to the nanoparticle and a biomolecular counterpart. This change in absorption can be very large when adhered molecules are at resonance (interband transitions). In addition, the presented type of biosensing can be a cost-effective and easy to use alternative to conventional biosensing techniques.
ISSN: 0003-2700
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Faculty of Science - miscellaneous
Electrical Engineering - miscellaneous
Quantum Chemistry and Physical Chemistry Section
Physics and Astronomy - miscellaneous
× corresponding author
# (joint) last author

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