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Jia, K., Khaywah, M. Y., Li, Y., Bijeon, J. L., Adam, P. M., Deturche, R., Guelorget, B., Francois, M., Louarn, G. & Ionescu, R. E. (2014) Strong Improvements of Localized Surface Plasmon Resonance Sensitivity by Using Au/Ag Bimetallic Nanostructures Modified with Polydopamine Films. ACS Appl. Mater. Interfaces, 6 219–227.
Added by: Florent Boucher (2016-04-29 09:26:45) |
| Type de référence: Article DOI: 10.1021/am403943q Numéro d'identification (ISBN etc.): 1944-8244 Clé BibTeX: Jia2014 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: albumin detection, arrays, gold nanoparticle, gold/silver bimetallic nanoparticles, improved LSPR sensitivity, metal, nanocrystals, optical-properties, polydopamine surface functionalization, sensors, shape, silver nanoparticle, size, spectroscopy Créateurs: Adam, Bijeon, Deturche, Francois, Guelorget, Ionescu, Jia, Khaywah, Li, Louarn Collection: ACS Appl. Mater. Interfaces |
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In the present work, the standard monometallic localized surface plasmon resonance (LSPR) biosensing sensitivity is highly improved when using a new system based on glass substrates modified with high-temperature annealed gold/silver bimetallic nanoparticles (Au/Ag bimetallic NPs) coated with polydopamine films before biomolecule specific immobilization. Thus, different zones of bimetallic NPs are spatially created onto a glass support thanks to a commercial transmission electron microscopy (TEM) grid marker in combination with two sequential evaporations of continuous films of gold (4 nm) and silver (2 nm) and, followed by annealing at 500 degrees C for 8 h. By using the scanning electron microscopy (SEM), it is found that annealed Au/Ag bimetallic NPs have uniform size and shape distribution that exhibited a sharper well-defined LSPR resonant peak when compared with that of monometallic Au NPs and thereby contributing to an improved sensitivity in LSPR biosensor application. The controlled micropatterns consisting of bimetallic particles are used in the construction of LSPR biochips for high-throughput detection of different concentrations of a model antigen named bovine serum albumin (BSA) on a single glass sample, with a lower limit of detection of 0.01 ng/mL under the optimized conditions.
Added by: Florent Boucher |