Ag nanocluster

Similarly, Pd, Ag, and Pd-Ag nanoclusters on alumina have been prepared by the polyol method [230]. Dend-rimer encapsulated metal nanoclusters can be obtained by the thermal degradation of the organic dendrimers [368]. If salts of different metals are reduced one after the other in the presence of a support, core-shell type metallic particles are produced. In this case the presence of the support is vital for the success of the preparation. For example, the stepwise reduction of Cu and Pt salts in the presence of a conductive carbon support (Vulcan XC 72) generates copper nanoparticles (6-8 nm) that are coated with smaller particles of Pt (1-2 nm). This system has been found to be a powerful electrocatalyst which exhibits improved CO tolerance combined with high electrocatalytic efficiency. For details see Section 3.7 [53,369]. 

Figure 6. Absorption spectra of spherical non-interacting nanoclusters embedded in no absorbing matrices (a) effect of the size for Ag nanoclusters in silica (b) effect of the matrix for R = 2.5 nm Au clusters (the refractive index n = and the position of the plasma resonance are reported for each considered matrix) (c) effect of the cluster composition for i = 5 nm noble-metal clusters (Ag, Au, Cu) in silica. (Reprinted from Ref [1], 2005, with permission from Italian Physical Society.)...

Peyser LA, Lee T-H, Dickson RM (2002) Mechanism of Ag nanocluster photoproduction from silver oxide films. J Phys Chem B 106 7725-7728... 

Vosch T, Antoku Y, Hsiang J-C, Richards Cl, Gonzalez JI, Dickson RM (2007) Strongly emissive individual DNA-encapsulated Ag nanoclusters as single-molecule fluorophores. Proc Natl Acad Sci 104 12616-12621... 

Shen Z, Duan H, Frey H (2007) Water-soluble fluorescent ag nanoclusters obtained from multiarm star poly(acrylic acid) as molecular hydrogel templates. Adv Mater 19 349-352... 

Richards Cl, Choi S, Hsiang J-C, Antoku Y, Vosch T, Bongiomo A, Tzeng Y-L, Dickson RM (2008) Oligonucleotide-stabilized Ag nanocluster fluorophores. J Am Chem Soc 130 5038-5039... 

Ritchie CM, Johnsen KR, Kiser JR, Antoku Y, Dickson RM, Petty JT (2007) Ag nanocluster formation using a cytosine oligonucleotide template. J Phys Chem C 111 175-181... 

Yu J, Choi S, Richards Cl, Antoku Y, Dickson RM (2008) Live cell surface labeling with fluorescent Ag nanocluster conjugates. Photochem Photobiol 84 1435-1439... 

Guo W, Yuan J, Wang E (2009) Oligonucleotide-stabilized Ag nanoclusters as novel fluorescence probes for the highly selective and sensitive detection of the Hg2+ ion. Chem Commun 23 3395-3397... 

The synthesis of conductive metallic nanowires that bridged two microelectrodes separated by a gap of 12-16 im was demonstrated by the growth of a silver nanowire on a DNA template that bridged the gap (Fig. 12.26).92 Short thiolated nucleic acids (12 bases long) were attached to the microelectrodes, and these acted as sticky ends for the hybridization of /.-DNA that bridged the gap. The association of Ag+ to the phosphate groups of the template, followed by their reduction with hydroquinone under basic conditions, resulted in the formation of Ag° nanoclusters on the DNA template. The subsequent enlargement of the Ag° seeds by the catalytic reduction of Ag+ by hydroquinone, under acidic conditions, yielded continuous Ag nanowires with a width of ca. lOOnm. The nanowires revealed nonlinear I—V... 

Tada, H., K. Teranishi, Y. Inubushi and S. Ito (2000). Ag nanocluster loading effect an TiOj photocatalytic reduction of bis(2-dipyridyl)disulfide to 2-mercaptopyridine by H20. Langmuir, 16(7), 3304-3309. 

Figure 12 Combined electron diffraction and imaging characterization of supported Ag nanoclusters/nanocrystals on Si(lOO) substrate, (a) and (b) show randomly oriented nanoclusters, (c) and (d) show epitaxial nanocrystals after annealing...

Yang, G., Wang. W., Zhou, Y., Lu, H., Yang. G.. Chen. Z. Linear and nonlinear optical properties of Ag nanocluster/BaTiOj composite films. Appl. Phys. Lett. 81. 3969-3971 (2002)... 

Lai, X.F. St. Clair, T.P. Goodman, D.W. Oxygen-induced morphological changes of Ag nanoclusters supported on TiO2(110). Faraday Discuss. 1999, 114, 279. 

Thin layers of PTCBI (50 A thick) and BCP (75 A thick) are used as the EBL in the front and back subcells, respectively, thereby forming a high efficiency double HJ PV structure (Peumans et al., 2000). A CRZ consisting of Ag nanoclusters (-5 A average thickness) buried in a 50 A thick 4,4, 4"-tris(3-methyl-phenyl-phenyl-amino)triphenylamine (m-MTDATA) p-doped with 5 mol% tetrafluoro-tetracyano-quinodimethane (F4-TCNQ) (Maeimig et al., 2004) was employed to connect the two subcells in series, where electrons generated in the front cell and holes generated in the back cell recombine. 

Considerable potential is associated with the catalytic applications of Ag NPs, and there are several reports on the research in this field. The oxidation of ethylene, catalyzed by polyacrylic acid (PAA)-Ag nanoclusters, was performed in glycol under 1 atm of ethyleneioxygen. Products were identified as ethylene oxide by analysis with gas chromatography. Ag nanoclusters thus prepared had higher catalytic activity than a commercial silver catalyst. The oxidation rate catalyzed by the PAA-Ag nanoclusters remarkably inaeased with inaeasing reaction temperature. PAA-protected Ag nanoclusters had much higher activity than poly(A-vinyl-2-pyrrolidone)-protected particles at high temperatures. The addition of both caesium and rhenium ions eminently increased the catalytic activity of PAA-Ag nanoclusters (Shiraishi and Toshima 2000, Toshima et al. 2001). 

Silver AgN03, AgC2H302 Ag nanoclusters behaving as spacers within the carbon matrix 35... 

Korotcenkov G, Brinzari V, Boris Y, Ivanov M, Schwank J, Morante J (2003b) Surface Pd doping influence on gas sensing characteristics of SnO thin films deposited by spray pyrolysis. Thin Solid Films 436 119-126 Korotcenkov G, Macsanov V, Brinzari V, Tolstoy V, Schwank J, Cornet A, Morante J (2004) Influence of Cu, Fe, Co, and Mn oxide nanoclusters on sensing behavior of SnOj films. Thin Solid Films 467 209-214 Korotcenkov G, Cho BK, Gulina LB, Tolstoy VP (2012) Gas sensor application of Ag nanoclusters synthesized by SILD method. Sens Actuators B 166-167 402-410... 

M. Ferrari, F. Gonella, M. Montagna, C. Tosello, Detection and size determination of Ag nanoclusters in ion-exchanged soda-lime glasses by waveguided Raman spectroscopy. J. Appl. Phys. 79(4), 2055-2059 (1996)... 

Riskin M, Katz E, Willner I. Photochemically-controUed electrochemical deposition and dissolution of Ag° nanoclusters. Langmuir 2006 22 10483-10489. 

A.S. Kuznetsov, Y-G. Lu, S. Turner, M. V. Shestakov, V. K. Tikhomirov, D. Kirilenko, J. Verbeeck, A. N. Baranov, V. V. Moshchalkov, Preparation, structural and optical characterization of nanocrystalline ZnO doped with luminescent Ag-nanoclusters, Optical Materials Express 2 (2012) 723-734. 

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