Topic
Surface plasmon resonance
About: Surface plasmon resonance is a research topic. Over the lifetime, 24909 publications have been published within this topic receiving 810976 citations. The topic is also known as: Surface plasmon resonance & SPR (technology).
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TL;DR: In this article, the interaction between Ag nanoparticles and graphene supports along with the surface plasmon resonance properties were investigated for the first time, and the Ag/graphene heterostructures were synthesized through a simple thermal reduction process.
Abstract: The Ag/graphene heterostructures were synthesized through a simple thermal reduction process. The interaction between Ag nanoparticles and graphene supports along with the surface plasmon resonance properties of Ag nanoparticles on graphene were investigated for the first time.
284 citations
TL;DR: The immobilization of one binding partner, the possible depletion of analyte close to the sensor surface, and the assumed interaction model are important in the interpretation of binding data.
284 citations
TL;DR: The modified sensor chip showed an increasing SPR angle in response to dopamine concentration, which agrees with the expected sensing mechanism and the analyte binding process and the consequent swelling appeared to be reversible, allowing one the repeated use of the presented sensor chip.
Abstract: Molecularly imprinted polymer gel with embedded gold nanoparticle was prepared on a gold substrate of a chip for a surface plasmon resonance (SPR) sensor for fabricating an SPR sensor sensitive to a low molecular weight analyte. The sensing is based on swelling of the imprinted polymer gel that is triggered by an analyte binding event within the polymer gel. The swelling causes greater distance between the gold nanoparticles and substrate, shifting a dip of an SPR curve to a higher SPR angle. The polymer synthesis was conducted by radical polymerization of a mixture of acrylic acid, N-isopropylacrylamide, N,N‘-methylenebisacrylamide, and gold nanoparticles in the presence of dopamine as model template species on a sensor chip coated with allyl mercaptan. The modified sensor chip showed an increasing SPR angle in response to dopamine concentration, which agrees with the expected sensing mechanism. Furthermore, the gold nanoparticles were shown to be effective for enhancing the signal intensity (the change ...
283 citations
TL;DR: A new method for observing cell/substrate contacts of living cells in culture based on the optical excitation of surface plasmons is developed, which obtained a cell/ substrate distance of 160 +/- 10 nm for most parts of the cells.
283 citations
TL;DR: In this paper, the synthesis method of Au nanoparticles protected by a well-defined polymer monolayer is described, and the number mean diameter of the Au core was 3.2 nm as observed by high-resolution transmission electron microscopy.
Abstract: This work focuses on the synthesis method of Au nanoparticles protected by a well-defined polymer monolayer. Nanosized, spherical gold clusters coated with poly(N-isopropylacrylamide) (PNIPA) grafts were prepared by controlled radical polymerization. The polymerization of N-isopropylacrylamide was initiated from the surface of a gold nanoparticle modified with 4-cyanopentanoic acid dithiobenzoate for a reversible-addition-fragmentation chain-transfer polymerization. The number mean diameter of the Au core was 3.2 nm as observed by high-resolution transmission electron microscopy. The molar mass of the PNIPA ligand was 21000 g/mol by gel permeation chromatography. The changes in the surface plasmon of gold were investigated in different media, and as functions of particle concentration, as well as of temperature in aqueous solutions. The particles were soluble at least slightly in water, forming aggregates. The area and the maximum wavelength of the plasmon band in water decreased with dilution and increas...
283 citations