Journal ArticleDOI
Growth and Stability of Titanium Dioxide Nanoclusters on Graphene/Ru(0001)
Ryan T. Frederick,Zbynek Novotny,Falko P. Netzer,Gregory S. Herman,Zdenek Dohnálek,Zdenek Dohnálek +5 more
TLDR
The studies demonstrate that highly thermally stable TiOx nanoclusters of controlled composition and morphology can be prepared on Gr supports, and show that cluster ripening proceeds via a Smoluchowski mechanism below 800 K and above 800 K.Abstract:
Titanium dioxide/graphene composites have recently been demonstrated to improve the photocatalytic activity of TiO2 in visible light. To better understand the interactions of TiO2 with graphene we have investigated the growth of TiO2 nanoclusters on single-layer graphene/Ru(0001) using scanning tunneling microscopy (STM) and Auger electron spectroscopy (AES). Deposition of Ti in the O2 background at 300 K resulted in the formation of nanoclusters nucleating on intrinsic defects in the graphene (Gr) layer. The saturation nanocluster density decreased as the substrate temperature was increased from 300 to 650 K, while deposition at 700 K resulted in the significant etching of the Gr layer. We have also prepared nanoclusters with Ti2O3 stoichiometry using lower O2 pressures at 650 K. Thermal stability of the TiO2 nanoclusters prepared at 300 K was evaluated with AES and STM. No change in oxidation state for the TiO2 nanoclusters or etching of the Gr layer was observed up to ∼900 K. Annealing studies revealed...read more
Citations
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Effect of Oxygen on Thermal and Radiation-Induced Chemistries in a Model Organotin Photoresist
TL;DR: Mechanistic information is provided that can be applied to organotin EUV photoresists, where a significant increase in photoresist sensitivity may be obtained by varying the ambient conditions during EUV exposures.
Journal ArticleDOI
Photocatalytic Initiation of Radical Thiol–ene Reactions Using Carbon-Bi2O3 Nanocomposites
Viviana Maffeis,Viviana Maffeis,Ruairí O. McCourt,Rita Petracca,Olivier Laethem,Adalberto Camisasca,Adalberto Camisasca,Paula E. Colavita,Silvia Giordani,Silvia Giordani,Eoin M. Scanlan +10 more
TL;DR: A mild, inexpensive, and general photocatalytic initiation protocol for anti-Markovnikov hydrothiolation of olefins using carbon nanomaterial/metal oxide (carbon NM-MO) composites is reported in this paper.
Journal ArticleDOI
Quasi van der Waals epitaxy of copper thin film on single-crystal graphene monolayer buffer
TL;DR: In this paper, the authors demonstrate the epitaxial growth of polycrystalline cubic Cu films on single-crystal monolayer graphene using thermal evaporation at an elevated substrate temperature of 250 °C.
Journal ArticleDOI
Interfacial two-dimensional oxide enhances photocatalytic activity of graphene/titania via electronic structure modification
Dario De Angelis,Francesco Presel,Naila Jabeen,Naila Jabeen,Luca Bignardi,Daniel Lizzit,Paolo Lacovig,Silvano Lizzit,Tiziano Montini,Paolo Fornasiero,Dario Alfè,Alessandro Baraldi,Alessandro Baraldi,Alessandro Baraldi +13 more
TL;DR: In this paper, the photocatalytic activity of titania nanoparticles deposited on epitaxial graphene is proven to be significantly affected by the substrate on which graphene is supported, and it has been revealed that the addition of a two-dimensional TiO1.5 layer sandwiched between graphene and the supporting metal induces a p-doping of graphene itself and a consistent shift in the Ti d states.
References
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Journal ArticleDOI
Development of nanocrystalline TiO2–Er2O3 and TiO2–Ta2O5 thin film gas sensors: Controlling the physical and sensing properties
TL;DR: In this article, a comparison of single and binary metal oxide sensors with nanocrystalline and mesoporous microstructure, prepared by sol-gel route, was conducted.
Journal ArticleDOI
Bottom-up synthesis of anatase nanoparticles with graphene domains.
Gregory Mogilevsky,Olga Hartman,Erik D. Emmons,Alex Balboa,Jared B. DeCoste,Bryan J. Schindler,Ivan Iordanov,Christopher J. Karwacki +7 more
TL;DR: This novel graphene-based composite offers a practical alternative to synthesizing photocatalytically active materials with maximized graphene-TiO2 interface using alizarin and titanium isopropoxide following a bottom-up synthetic approach.
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Oxide stoichiometry in the early stages of titanium oxidation
TL;DR: In this article, the first stages of the titanium oxidation process were studied using principal component analysis (PCA) and electron spectroscopy and principal component decomposition (PCD) and it was shown that titanium oxidizes from nearly the beginning of the process with an almost negligible stage of oxygen adsorption.
Journal ArticleDOI
Enhanced Performance of Dye-Sensitized TiO2 Solar Cells Incorporating COOH-Functionalized Si Nanoparticles
TL;DR: In this article, dye-sensitized solar cells (DSSCs) treated with COOH-functionalized Si (Si-COOH) nanoparticles exhibited a higher short-circuit photocurrent density (Jsc) and opencircuit voltage than the corresponding untreated DSSC.
Journal ArticleDOI
Preparation of TiO2 Nanocrystallites by Oxidation of Ti−Au(111) Surface Alloy
TL;DR: In situ scanning tunneling microscopy studies show that the approach to form nanocrystals of TiO(2) on Au(111) yields arrays of 8-11 nm wide crystals with relatively narrow size dispersion and uniform crystallography.