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2019-08-29
02:27
OpenAccess [PUBDB-2019-03140] Journal Article
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A versatile nanoreactor for complementary in situ X-ray and electron microscopy studies in catalysis and materials science
Two in situ `nanoreactors' for high-resolution imaging of catalysts have been designed and applied at the hard X-ray nanoprobe endstation at beamline P06 of the PETRA III synchrotron radiation source. The reactors house samples supported on commercial MEMS chips, and were applied for complementary hard X-ray ptychography (23 nm spatial resolution) and transmission electron microscopy, with additional X-ray fluorescence measurements. [...]
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2019-08-23
14:28
[PUBDB-2019-03100] Journal Article
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Correlating Nanostructure, Optical and Electronic Properties of Nanogranular Silver Layers during Polymer-Template-Assisted Sputter Deposition
Tailoring the optical and electronic properties of nanostructured polymer–metal composites demonstrates great potential for efficient fabrication of modern organic optical and electronic devices such as flexible sensors, transistors, diodes, or photovoltaics. Self-assembled polymer–metal nanocomposites offer an excellent perspective for creating hierarchical nanostructures on macroscopic scales by simple bottom-up processes. [...]
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2019-08-08
15:08
Embargoed OpenAccess [PUBDB-2019-02948] Journal Article
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Potential-Induced Pitting Corrosion of an $\mathrm{IrO_{2}(110)-RuO_{2}(110)/Ru(0001)}$ Model Electrode under Oxygen Evolution Reaction Conditions
ACS catalysis 9(7), 6530 - 6539 () [10.1021/acscatal.9b01402]  GO
Sophisticated $\mathrm{IrO_{2}(110)}$-based model electrodes are prepared by deposition of a 10 nm thick single-crystalline $\mathrm{IrO_{2}(110)}$ layer supported on a structure-directing $\mathrm{IrO_{2}(110)-RuO_{2}(110)/Ru(0001)}$ template, exposing a regular array of mesoscopic rooflike structures. With this model electrode together with the dedicated in situ synchrotron based techniques (SXRD, XRR) and ex situ characterization techniques (SEM, ToF-SIMS, XPS), the corrosion process of $\mathrm{IrO_{2}(110)}$ in an acidic environment (pH 0.4) is studied on different length scales. [...]
Published on 2019-06-12. Available in OpenAccess from 2020-06-12.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: acscatal.9b01402 - Download fulltextPDF Download fulltextPDF (PDFA); Pitting_corrosion_IrO2(110)_SI_revision_proof - Download fulltextPDF Download fulltextPDF (PDFA); External link: Download fulltextFulltext
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2019-08-08
11:36
[PUBDB-2019-02941] Journal Article
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Surface Reconstruction under the Exposure of Electric Fields Enhances the Reactivity of Donor-Doped SrTiO$_{3}$
In the present work, we show how exposure to electricfieldsduring a high-temperature treatment can be used to manipulate surfaceproperties of donor-doped ceramics and thus improve their reactivity. La$_{0.1}$Sr$_{0.9}$TiO$_3$(LSTO) nanoparticles, prepared by hydrothermal synthesis,were consolidated under air with and without external electricfields. [...]
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2019-08-08
11:21
[PUBDB-2019-02940] Journal Article
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Tuning the Elasticity of Cross-Linked Gold Nanoparticle Assemblies
Composite materials of organically stabilized or cross-linked metal nanoparticles represent a versatile material class with manifold potential applications. Numerous studies explored their tunable optical and charge transport properties. [...]
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2019-07-19
15:23
OpenAccess [PUBDB-2019-02752] Journal Article
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Carboxylic acid induced near-surface restructuring of a magnetite surface
A fundamental knowledge of the interaction of carboxylic acids, such as formic acid, withmagnetite surfaces is of prime importance for heterogeneous catalysis and the synthesis ofnovel materials. Despite this, little is known about the atomic scale adsorption mechanisms.Here we show by in-situ surface X-ray diffraction that the oxygen rich subsurface cationvacancy reconstruction of the clean magnetite (001) surface is lifted by dissociative formicacid adsorption, reestablishing a surface with bulk stoichiometry. [...]
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2019-06-04
14:06
OpenAccess [PUBDB-2019-02412] Journal Article
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Characterization of Native Oxide and Passive Film on Austenite/Ferrite Phases of Duplex Stainless Steel Using Synchrotron HAXPEEM
A new measurement protocol was used for microscopic chemical analysis of surface oxide films with lateral resolution of 1 μm.The native air-formed oxide and an anodic passive film on austenite and ferrite phases of a 25Cr-7Ni super duplex stainless steelwere investigated using synchrotron hard X-ray photoemission electron microscopy (HAXPEEM). Pre-deposited Pt-markers, incombination with electron backscattering diffraction mapping (EBSD), allowed analysis of the native oxide on individual grains ofthe two phases and the passive film formed on the same area after electrochemical polarization of the sample. [...]
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2019-02-27
13:56
Embargoed OpenAccess [PUBDB-2019-01264] Journal Article
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In Situ Studies of the Electrochemical Reduction of a Supported Ultrathin Single-Crystalline $RuO_{2}$ (110) Layer in an Acidic Environment
With in situ surface X-ray diffraction (SXRD)and X-ray reflectivity (XRR) in combination with ex situcharacterization by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and cyclic voltamme-try, the electrochemical reduction of an ultrathin (1.66 nmthick) single-crystalline RuO$_2$(110) layer supported onRu (0001) is studied in an acidic environment, providingclear-cut evidence and mechanistic details for the trans-formation of RuO$_2$ to hydrous RuO$_2$ and metallic Ru. The reduction process proceeds via proton insertion into the RuO$_2$ (110)lattice. [...]
Published on 2019-01-24. Available in OpenAccess from 2020-01-24.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA); External link: Download fulltextFulltext
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2019-02-26
15:33
Embargoed OpenAccess [PUBDB-2019-01256] Journal Article/Contribution to a conference proceedings/Contribution to a book
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Atomically thin monolayers of metal organic frameworks (MOFs) through implementing a Langmuir-Schaefer method
Recent Advances on Environment, Chemical Engineering and Material, SliemaSliema, Malta, 22 Jun 2018 - 24 Jun 20182018-06-222018-06-24 AIP conference proceedings 2022, 020007 () [10.1063/1.5060687]  GO
Metal Organic Frameworks (MOFs) have been of increasing interest over the last few years. They are structures which consist of metal ions or clusters coordinated to organic ligands in order to form one-, two-, or three-dimensional networks that often exhibit high porosity, an asset that is commonly exploited in hydrogen storage, heterogeneous catalysis and photo-catalysis as well as gas separation. [...]
Published on 2018-11-07. Available in OpenAccess from 2019-11-07.: Download fulltextPDF Download fulltextPDF (PDFA); External link: Download fulltextFulltext
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2019-01-10
12:20
[PUBDB-2019-00278] Journal Article
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Fabrication of Strain Gauges via Contact Printing: A Simple Route to Healthcare Sensors Based on Cross-Linked Gold Nanoparticles
In this study, we developed a novel and efficient process for the fabrication of resistive strain gauges for healthcare-related applications. First, 1,9-nonanedithiol cross-linked gold nanoparticle (GNP) films were prepared via layer-by-layer (LbL) spin-coating and subsequently transferred onto flexible polyimide foil by contact printing. [...]
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