Surfaces gold-doped

Nolan M, Verdugo VS, Metiu H. Vacancy formation and CO adsorption on gold-doped ceria surfaces. Surf Sci. 2008 602 2734-42. 

Figure 1812 Surface-enhanced Raman spectra of phenylacetylene adsorbed from a 1% v/v solution in methanol onto (a) silver-doped and (b) gold-doped TEOS sol gel. (c) Standard Raman spectrum of the neat hquid. (Courtesy of Stuart Farquharson, Real-Time Analyzers, Inc.)...

The first reports on direct electrochemistry of a redox active protein were published in 1977 by Hill [49] and Kuwana [50], They independently reported that cytochrome c (cyt c) exhibited virtually reversible electrochemistry on gold and tin doped indium oxide (ITO) electrodes as revealed by cyclic voltammetry, respectively. Unlike using specific promoters to realize direct electrochemistry of protein in the earlier studies, recently a novel approach that only employed specific modifications of the electrode surface without promoters was developed. From then on, achieving reversible, direct electron transfer between redox proteins and electrodes without using any mediators and promoters had made great accomplishments. 

Other materials such as gold (< = 4.9 eV), aluminum (< = 4.2 eV), indium-doped zinc oxide, magnesium indium oxide, nickel tungsten oxide, or other transparent conductive oxide materials, have been studied as anodes in OLEDs. Furthermore, the WF of ITO can be varied by surface treatments such as application of a very thin layer of Au, Pt, Pd, or C, acid or base treatments, self-assembly of active surface molecules, or plasma treatment. 

It is difficult to predict the effect of surface functionalization on the optical properties of nanoparticles in general. Surface ligands have only minor influence on the spectroscopic properties of nanoparticles, the properties of which are primarily dominated by the crystal field of the host lattice (e.g., rare-earth doped nanocrystals) or by plasmon resonance (e.g., gold nanoparticles). In the case of QDs, the fluorescence quantum yield and decay behavior respond to surface functionalization and bioconjugation, whereas the spectral position and shape of the absorption and emission are barely affected. 

Fulleride anions are often more soluble, especially in more polar solvents, than the parent fullerenes. For example, in bulk electrolysis experiments with tetra-n-butylammonium perchlorate (TBACIO4) as supporting electrolyte, carried out in acetonitrile where Cjq is completely insoluble, fairly concentrated, dark red-brown solutions of 50 can be obtained [81]. Upon reoxidation, a quantitative deposition of a neutral Cjq film on the surface of a gold/quartz crystal working electrode takes place. This Cjq film can be stepwise reductively doped with TBA, leading to (Cjo )... 

Again, the precise roles of coordination-compound chemical sensitizers, in most cases, are not understood. In fact, their effects may have little to do with their own coordination chemistry. Many simple salts of gold and other noble metals are effective sensitizers. They also may be added to solutions during silver halide precipitation to produce doped emulsions that have special properties. A variety of compounds that can act as ligands to metal ions are also effective alone as chemical sensitizers, the result of complicated oxidation-reduction, ion replacement and adsorption reactions on the silver halide grain surface. These include polyamines, phosphines and thioether- or thiol-containing compounds. The chemistry of these materials with the silver halide surface is discussed in the reference literature. 

Fig. 5 Principal scheme of interactions of LbL films (b), namely, PSS/PAH and HA/PLL, with gold nanoparticles (a, c) and DNA (d, f). The nanoparticles and DNA interact only with the surface PAH groups of the PSS/PAH film (a, d). However, they can accumulate in large quantities as a result of the interaction with PLL doping from the whole interior of the HA/PLL film (c, f). Diffusion of DNA into the HA/PLL film can be triggered by heating to 70°C (e). Optical and confocal fluorescent microscopy images of gold nanoparticles (g) and DNA-EtBr (h) adsorbed onto the (PLL/HA)24/PLL film, respectively. Reproduced from [98]...

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