Gold nanoparticles surface plasmon resonance

Surface plasmon resonance (SPR) is a method for measuring adsorption of materials onto planar (frequently gold or silver) surfaces or to the surface of metal nanoparticles. Surface plasmon resonance is observed when the frequency of photons matches the frequency of oscillation of the bound metal electrons. SPR can be used in a number of colour-based biosensor applications as well as lab-on-a chip sensors. SPR has been used to follow the rate of release of DNA III polymerase holo-enzyme following gap filling between Ozaki fragments where it was... 

Long period gratings modified by the deposition of a self-assembled colloid monolayer of gold have been shown to enhance SRI sensitivity, which was attributed to the localized surface plasmon resonance (LSPR) of gold nanoparticles61. The system was used after functionalization of the gold nanoparticles with dini-trophenyl (DNP) antigen, for the detection of anti-(DNP) with a limit of detection as low as 9.5 x 10 10 M. 

The electronic structure and hence optical properties of nanomaterials depend on the core size. For example, nanoparticles of core size >3 nm show surface plasmon resonance, which is due to the excitation of surface plasmons of nanoparticles by light. When the size of gold nanoparticles comes down to around 1 nm, which is equal to the de Broglie wavelength of the conduction electrons, the electronic bands... 

Template core-shell particles with cores comprised mainly of poly(glycidyl methacrylate) (GMA) and shells consisting mainly of PNIPAM and amino or thiol-functionalized have been used for the synthesis of Au NPs. The obtained hybrid particles exhibited a reversible color change from red to purple, which originated from the surface plasmon resonance of gold nanoparticles and was temperature-dependent in the range 25-40 °C [96] (Scheme 3.15). 

Similar to zero-dimensional metal nanoparticles, most of the work on one-dimensional metal nanostructures focuses almost exclusively on gold nanorods. The high interest in anisometric gold nanoclusters arises from their unique optical and electronic properties that can be easily tuned through small changes in size, structure (e.g., the position, width, and intensity of the absorption band due to the longitudinal surface plasmon resonance is strongly influenced by the shell as well as the aspect ratio of the nanorods), shape (e.g., needle, round capped cylinder, or dog bone), and the inter-particle distance [157]. 

Ghosh SK Pal T, Interparticle coupling effect on the surface plasmon resonance of gold nanoparticles From theory to applications, Chem. Rev., 2007, 107, 4797-4862. 

Eusns S El-Sayed MA, Why gold nanoparticles are more precious than pretty gold Noble metal surface plasmon resonance and its enhancement of the radiative and nonradiative properties of nanocrystals of different shapes, Chem. Soc. Rev., 2006, 35, 209-217. 

Quantum size effects famous examples are the color shift upon size reduction of semiconductor nanoparticles like CdSe [14-16], and the surface plasmon resonance of metallic nanoparticles like gold [17, 18]. 

El-Sayed IH, Huang X, El-Sayed MA. Surface plasmon resonance scattering and absorption of anti-EGFR antibody conjugated gold nanoparticles in cancer diagnostics applications in oral cancer. Nano Lett 2005 5 829-34. 

Tokareva I, Minko S, Fendler H, Hutter E (2004) Nanosensors based on responsive polymer brushes and gold nanoparticle enhanced transmission surface plasmon resonance spectroscopy. 1 Am Chem Soc 126 15950-15951... 

Sato Y, Hosokawa K, Maeda M (2008) Detection of non-cross-linking interaction between DNA-modified gold nanoparticles and a DNA-modified flat gold surface using surface plasmon resonance imaging on a microchip. Colloids Surf Biointerfaces 62 71-76... 

A parallel development in sensor technology is the use of gold nanoparticles (AuNPs) and their localized surface plasmon resonances (LSPR) [41] for sensing purposes. Mirkin et al. [42] showed how single nanoparticles (NPs) in solution can... 

Rooney P, Rezaee A, Xu S et al (2008) Control of surface plasmon resonances in dielectrically-coated proximate gold nanoparticles immobilized on a substrate. Phys Rev B 77 235446... 

Wang TJ, Lin CS (2006) Electro-optically modulated localized surface plasmon resonance biosensors with gold nanoparticles. Appl Phys Lett 89 173903... 

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