Carbon/molecule/TiO2/Au molecular electronic junctions show robust conductance switching, in which a metastable high conductance state may be induced by a voltage pulse which results in redox reactions in the molecular and TiO2 layers. When Ag is substituted for Au as the "top contact", dramatically different current/voltage curves and switching behavior result. When the carbon substrate is bia...

Gold nanoparticles with two different size distributions (average sizes of ∼1.5 and ∼5 nm) have been synthesized by inverse micelle encapsulation and deposited on reducible (TiO2) and nonreducible (SiO2) supports. The thermal and chemical stability of oxidized gold species formed upon cluster exposure to atomic oxygen have been investigated in ultrahigh vacuum using a combination of temperature...

The charge state of Ag and Au atoms and clusters (Ag4 and Au4, Ag5 and Au5) adsorbed on defective TiO2 anatase(101) and tetragonal ZrO2(101) has been systematically investigated as a function of oxide doping and defectivity using a DFT+U approach. As intrinsic defects, we have considered the presence of oxygen vacancies. As extrinsic defects, substitutional nitrogen- and niobium-doping have bee...

We provide direct evidence of a water-mediated reaction mechanism for room-temperature CO oxidation over Au/TiO2 catalysts. A hydrogen/deuterium kinetic isotope effect of nearly 2 implicates O-H(D) bond breaking in the rate-determining step. Kinetics and in situ infrared spectroscopy experiments showed that the coverage of weakly adsorbed water on TiO2 largely determines catalyst activity by ch...

The development of new fabrication techniques of plasmonic nanocomposites with specific properties is an ongoing issue in the plasmonic and nanophotonics community. In this paper we report detailed investigations on the modifications of the microstructural and plasmonic properties of metal-titania nanocomposite films induced by swift heavy ions. Au-TiO2 and Ag-TiO2 nanocomposite thin films with...

Furfural (FF) has a high potential to become major renewable platform molecule produce biofuels and bio-based chemicals. The catalytic performances of AuxPty AuxPdy bimetallic nanoparticulate systems supported on TiO2 were studied in base-free aerobic oxidation furfural furoic acid (FA) maleic (MA) water. characterization the catalysts was performed using standard techniques. optimum reaction c...

0021-9517/$ see front matter Published by Elsevier doi:10.1016/j.jcat.2010.11.001 ⇑ Corresponding author at: Department of Electric Southern California, Los Angeles, CA 90089, USA. Fax: E-mail address: [email protected] (S.B. Cronin). By integrating strongly plasmonic Au nanoparticles with strongly catalytic TiO2, we observe enhanced photocatalytic decomposition of methyl orange under visible ill...

Surface-enhanced Raman scattering (SERS) and surface-enhanced resonance Raman scattering (SERRS) results are reported for self-assembled monolayers (SAMs) of 4-(4-mercaptobutyl)-4‘-ferrocenylazobenzene, compound 1, on Admica and Wmica thin films. Two different Admica surfaces, designated Au(rough)/ mica and Au(lll)/mica, have been characterized by atomic force microscopy (AFM) to define their r...

High quality homoepitaxial growth of Si on Si(ll1) through an overlayer of Au is shown to occur at 450-500 “C, far below the temperature required for growth of Si of similar quality on bare Si(ll1). Films of unlimited thickness can be obtained with excellent crystalline quality, as revealed by Rutherford backscattering spectrometry ion channeling measurements (~~~“2.2%). A distinct range of Au ...