Gold Nanoparticle Supports

Polyaniline is an attractive electropolymerizable polymer for surface modifications due to its unique redox properties, high electrical conductance, and ease of preparation. In addition, polyaniline-modified surfaces retain a large specific surface area and can remain conductive facilitating subsequent electron transfer. Feng and coworkers [8] constructed a DNA impedance biosensor based on gold nanoparticle/pol5 niline nanotube membranes formed in the presence of chitosan as shown in Fig. 14.1. Chitosan was used 

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Maye et al. studied gold nanoparticles supported on carbon black for ORR in both acidic and alkaline media.210 The gold nanoparticles were of a core-shell type where the particle consisted of a gold nanocrystal core of 1-6 nm in diameter that was surrounded by an organic monolayer shell.214 While the Au/C catalyst was found to be active for ORR, its activity was much lower than that of Pt/C, PtRu/C and AuPt/C. The electron transfer in 0.5 M H2S04 was reported as 2.9 0.2, indicating a mixed reduction pathway.210... 

This chapter is divided into three parts. Firstly, the catalytic activities and stabilities of gold nanoparticles supported on allotropic Ti02 phases are compared. To understand the mechanism of catalysis of the gold nanoparticles deposited on metal... 

Zanella R, Giogio S, Shin CH, Henry CR Louis C (2004) Characterization and reactivity in CO oxidation of gold nanoparticles supported on Xi02 prepared by deposition-preparation with NaOH and Urea. J Catal 222 257-267... 

An example of the usefulness of the methodology was the new industrial route to cyclohexanone oxime developed by Corma and Serna, a process which is based on the selective hydrogenation of 1-nitro-l -cyclohexene by gold nanoparticles supported on Ti02 or Fe203 [220]. 

Zanella, R., Giorgio, S., Henry, C. R. and Louis, C. (2002). Alternative methods forthe preparation of gold nanoparticles supported on Ti02. J. Phys. Chem. B 106(31), 7634-7642. 

K. Mallick, M. S. Scurrell, CO oxidation over gold nanoparticles supported on TiOi and TiOi-ZnO Catalytic activity effects due to surface modification of TiOi with ZnO, Appl. Catal. A 253 (2003) 527. 

Fig. 2a - STEM image of gold hemisphere on y-AhOs 2b - Larger area STEM image of gold nanoparticles supported on y-Al203 2c - Histogram of as-prepared Au on y-AlaCh catalyst particles.

Other diols, polyols [77], amino alcohols [77] and glucose [77, 80,120] have also been oxidized with remarkable selectivity to hydroxy- and amino- acids by oxygen in strong basic aqueous media using gold nanoparticles supported on carbon and metal oxides as catalysts (Schemes 12.14 and 12.15). 

V. Idakiev, T. Tabakova, K. Tenchev, Z.-Y. Yuan, T.-Z. Ren, B.-L. Su, Gold nanoparticles supported on ceria-modified mesoporous titania as highly active catalysts for low-temperature water-gas shift reaction, Catal. Today 128 (2007) 223-229. 

A. Sandoval, A. Gomez-Cortes, R. ZaneUa, G. Diaz, J. M. Saniger, Gold nanoparticles support effects for the WGS reaction, J. Mol. Catal. A Chem. 278 (2007) 200-208. 

Gold nanoparticles supported on oxides and carbides show a high activity in many catalytic processes not seen for bulk metallic gold. Quantum-effects related to the small size of the particles could be responsible for the enhancement in catalytic activity with respect to bulk gold. The edge and corner sites of a gold nanoparticle have... 

Yan SH, Zhang SC, Lin Y, Liu GR (2011) Electrocatalytic performance of gold nanoparticles supported on activated carbon for methanol oxidation in alkaline solution. J Phys Chem C 115 6986-6993... 

In good agreement with Yagi et al., Guerin et al. observed that for gold nanoparticles supported on substoichiometric titanium dioxide (TiO ) and on carbon, the activity decreased for diameters <3 nm with decreasing particle size, independently of the supporting material [28]. Nevertheless, unlike the aforementioned studies, the catalytic activity was clearly independent of particle size above this critical size (Fig. 16.4). 

Kominami H, Tanaka A, Hashimoto K (2010) Mineralization of organic acids in aqueous suspensions of gold nanoparticles supported on cerium(lV) oxide powder under visible light irradiation. Chem Commun 46 1287... 

Abdolmohammadi S (2013) Simple route to indeno[l,2-6]quinoline derivatives via a coupling reaction catalyzed by TiO nanoparticles. Chinese Chem Lett 24 318—320 Symeonidis TS, Lykakis IN, Litinas KE (2013) Synthesis of quinolines and fused pyrido-coumarins from N-propargylanilines or propargylaminocoumarins by catalysis with gold nanoparticles supported on TiO. Tetrahedron 69 4612 616... 

Alvaro M., Cojocaru B., Ismail A. A., et al. Visible-light photocatalytic activity of gold nanoparticles supported on template-synthesized mesoporous titania for the decontamination of the chemical warfare agent Soman. Appl. Catal. B. 99 no. 1-2 (2010) 191-197. 

Wei, Y., Liu, J., Zhao, Z., Chen, Y., Xu, C., Duan, A., Jiang, G., and He, H. (2011) Highly active catalysts of gold nanoparticles supported on three-dimensionally ordered macroporous LaFeOa for soot oxidation. Angew. Chem., Int. Ed., 50, 2326-2329. 

Su, R, Chen, M., Wang, L., et al. (2008). Aerobic Oxidation of Alcohols Catalyzed by Gold Nanoparticles Supported on Gallia Polymorphs, Catal. Commun., 9, pp. 1027-1032. 

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