Surface-functionalized nanostructured gold

Gonsalves K E, Carlson G, Chen X, Gayen S K, Perez R and Jose-Yacainan M (1995) Surface functionalized nanostructured gold/polymer composites, Polym Mater Sci Eng 73 298-302. 

Cho EC, Au L, Zhang Q, Xia Y (2010) The effects of size, shape, and surface functional group of gold nanostructures on their adsorption and intemalization by cells. Small 6 517... 

Hasegawa M, Keum C D, Watanabe O. 2002. Enhanced photofabrication of a surface nanostructure on azobenzene functionalized pol5mer films with evaporated gold Nanoislands. Adv Mater 14(23) 1738 1741. 

Another possible application of chiral metal nanostructures is catalysis. For example, Kobayashi et al7 used chiral noble metal nanoparticles for asymmetric C-C bond formation. In another work Heiz et al. employed variations of the pH for the ligand N-acetyl cysteine that were subsequently bound to platinum nanoclusters to generate differences in the moieties bound to the surface of the cluster. The researchers also reported the special production of Pt nanoclusters in the presence of ethylene glycol which were then replaced with cysteine and derivatives generating chiral functionality on the particles. These nanoclusters were then be used for the enantioselective hydrogenation of butanone. Finally, Somorjai et al7 produced a chiral self assembled monolayer of gold nanoparticles in mesoporous silica which has been used to catalyse the production of cyclic propanes in high enantiomeric excess. 

In another work, silica nano helices have been prepared from the organic self-assemblies of -tartrate amphiphiles by sol-gel transcription. Then this chiral nanostructures were functionalized with (3-aminopropyl)-trietho)y-silane (APTES) or (3-mercaptopropyl)triethoxysilane (MPTES) and decorated with gold nanoparticles of various diameters (1-15 nm) resulting in nanohelix hybrid structures (Fig. 25). ° It was found that the surface plasmon resonance intensity of these nanohybrid systems increased with gold particle size. Gold nanoparticles of 10-14 nm diameter have clearly showed a surface enhanced effect on Raman spectroscopy. This sj tem is a unique example of the 3D hybrid network that could be used as ultrasensitive chemical and biological sensors for detection of molecules of interest in liquids by accumulation under flow. 

---