Silver nanoshells

Zhang, J., Gryczynsld, I., Gryczynski, Z. and Lakowicz, J. R. (2006). Dye-labeled silver nanoshell-bright particle, y. Phys. Chem. B 110 8986-8991. 

Zhang J, Gryczynski I, Gryczynski Z, Lakowicz JR (2006) Dye-labeled silver nanoshell — bright particle. J Phys Chem B 110 8986... 

Kiistner B, Gellner M, Schiitz M, Schdppler F, Marx A, Strdbel P, Adam P, Schmuck C, Schliicker S (2009) SERS labels for red laser excitation silica-encapsulated SAMs on tunable gold/silver nanoshells. Angew Chem Inter Ed 48 1950... 

FIGURE 20.10 Schematic view of the formation of metallic shells around organic micelles in aqueous solution. (From Attia, J., Remita, S., Jonic, S. et al.. Radiation-induced synthesis and cryo-TEM characterization of silver nanoshells on linoleate spherical micelles, Langmuir, 23, 9523-9526. Copyright 2007, with permission from American Chemical Society.)... 

Jackson, J.B. and N.J. Halas, Silver Nanoshells Variations in Morphologies and Optical Properties. J. Phys. Chem. B., 2001.105 p. 2743-2746. 

Qu, Y., Porter, R., Shan, F., Carter, J. and Guo, T. (2005) Synthesis of tubular gold and silver nanoshells using silica nanowire core templates. Langmuir, 22(14), 5357-74. 

B. Kiistner, M. Gellner, M. Schiitz, F. Sehoppler, A. Marx, P. Strobel, P. Adam, C. Sehmuek, S. Schliicker, SERS labels fm red laser exeitation Siliea-eneapsulated SAMs on tunable gold/silver nanoshells. Angew. Chem Int Ed. 48, 1950 (2009)... 

Figure 3. Various type of SERS active metallic nanostructures (a) metal-island films (b) metal-coated nanospheres (semi-nanoshells) (c) metal-coated random nanostructures and (d) polymer coatings embedded with metal nanoparticles. Inset An SEM image of silver-coated polystyrene spheres.

Metallic Gold, silver, palladium, platinum Nanoparticles, nanoshells... 

Figure 6.38. Schematic of Ag nanoshell formation from a nanostructural Co core. Due to favorable redox couples between Ag and Co, a nanoshell of metallic silver forms at the expense of the inner Co core. Reproduced with permission from Chen, M. Gao, L. Inorg. Cheni. 2006, 45, 5145. Copyright 2006 American Chemical Society.

Significant progress has been made in controlling the size and shape of metal nanoparticies. Monodis-perse single crystal nanocubes, nanorods, and nanoshells have all been prepared using simple methods. The size and shape of gold particles are more easily controlled than those of silver, and consequently silver-clad gold nanoparticies have been prepared and shown to possess distinct optical properties. 

The use of optical radiation is perspective for remote control over the capsule shell permeability in chemical technology and medical applications. Optical radiation can be used for therapeutic and diagnostic applications together with adressable excitation of capsule shells. To achieve capsules sensitivity to the optical radiation, absorbing dyes are used as plasmon-resonant nanoparticles, nanoshells and nanorods of noble metals (silver, gold). 

Figure 15.13. Combined imaging and therapy of SKBR-3 cells using anti-HER2 coated nanoshells. Darkfield imaging (top row), calcein AM staining for cell viability (middle row), and silver staining of nanoshell binding (bottom row). Increased contrast was observed only when cells were incubated with anti-HER2 nanoshells, and only these samples experienced cell death after exposure to a NIR laser. Reprinted with permission from Ref. 19. Copyright 2005 American Chemical Society.

Removal of the silver cores by chemical etching formation of dye-doped silica nanoshells... 

Figure 22 Schematic representation, (a) Preparation of eosin-doped silica-coated silver nanoparticles (b) addition of fluorescein-doped sihca shells onto eosin-doped silica-coated silver nanoparticles (c) preparation of dye-doped hollow silica nanoshells by dissolution of the silver core. (Reproduced with permission from Ref. 41. 2009, American Chemical Society.)...

A. Giiltekin, A. Ersoz, A. Denizli, and R. Say, Gold-silver-nanoclusters having chohc acid imprinted nanoshell, Talanta, 93,364-370,2012. 

The difference in standart potentials of two metals or solid template can induce or promote the reduction process. This is the case with HAUCI4 and silver nanorod template. Gold nanoshells have been synthesized by reacting aqueous HAuCb solutions with solid templates (silver nanorods), because the standard reduction potential of AuCU Au pair (0.99V, vs. SHE) is higher than that of kgikg pair (0.80V, vs. SHE), silver nanostructures suspended in solution can be oxidized by HAuCU according to the following replacement reaction... 

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