Surface plasmon resonance on gold and silver films coated with thin layers of amorphous silicon-carbon alloys.
The paper reports on a novel surface plasmon resonance (SPR) substrate architecture based on the coating of a gold (Au) or silver (Ag) substrate with 5 nm thin amorphous silicon-carbon alloy films. Ag/a-Si(1-x)C(x):H and Au/a-Si(1-x)C(x):H multilayers are found to provide a significant advantage in terms of sensitivity over both Ag and Au for SPR refractive index sensing. The possibility for the subsequent linking of stable organic monolayers through Si-C bonds is demonstrated. In a proof-of-principle experiment that this structure can be used for real-time biosensing experiments, amine terminated biotin was covalently linked to the acid-terminated SPR surface and the specific streptavidin-biotin interaction recorded.
Physique de la Matière Condensée, Ecole Polytechnique, CNRS, 91128 Palaiseau, France.
Larbi
L
Touahir
Joanna
J
Niedziółka-Jönsson
Elisabeth
E
Galopin
Rabah
R
Boukherroub
Anne Chantal
AC
Gouget-Laemmel
Ionel
I
Solomon
Mikhail
M
Petukhov
Jean-Noël
JN
Chazalviel
François
F
Ozanam
Sabine
S
Szunerits
D000497:Alloys / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D008567:Membranes, Artificial; D008956:Models, Chemical; D015394:Molecular Structure; D012825:Silicon / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*
D000497:Alloys; D008567:Membranes, Artificial; D012834:Silver; D002244:Carbon; D006046:Gold; D012825:Silicon