Charge Polarization at Catalytic Metal–Support Junctions. Part B: Theoretical Modeling of Kelvin Probe Force Microscopy

Kittel, Tobias; Roduner, Emil

doi:10.1021/acs.jpcc.6b00898

Cited by 7 publications

(18 citation statements)

References 31 publications

(81 reference statements)

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“…Finally, we believe that the enhanced adhesion observed for Pt can also be explained by the proposed mechanism. Charge polarization at the interface of Pt–oxide support has been reported elsewhere. , …”

Section: Results and Discussionmentioning

confidence: 71%

Postdeposition UV-Ozone Treatment: An Enabling Technique to Enhance the Direct Adhesion of Gold Thin Films to Oxidized Silicon

et al. 2019

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We found that continuous films of gold (Au) on oxidized silicon (SiO2) substrates, upon treatment with ultraviolet (UV)-ozone, exhibit strong adhesion to the SiO2 support. Importantly, the enhancement is independent of micro- or nanostructuring of such nanometer-thick films. Deposition of a second Au layer on top of the pretreated Au layer makes the adhesion stable for at least 5 months in environmental air. Using this treatment method enables us to large-scale fabricate various SiO2-supported Au structures at various thicknesses with dimensions spanning from a few hundreds of nanometers to a few micrometers, without the use of additional adhesion layers. We explain the observed adhesion improvement as polarization-induced increased strength of Auδ−Siδ+ bonds at the Au–SiO2 interface due to the formation of a gold oxide monolayer on the Au surface by the UV-ozone treatment. Our simple and enabling method thus provides opportunities for patterning Au micro/nanostructures on SiO2 substrates without an intermediate metallic adhesion layer, which is critical for biosensing and nanophotonic applications.

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Section: Results and Discussionmentioning

confidence: 71%

Postdeposition UV-Ozone Treatment: An Enabling Technique to Enhance the Direct Adhesion of Gold Thin Films to Oxidized Silicon

et al. 2019

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“…11-13 of companion paper) 15 were used, otherwise it was calculated numerically (Eqns. 7-9 of companion paper) 15 which was much more time consuming. Further details are given elsewhere.…”

Section: Scanning Probe Microscopymentioning

confidence: 99%

“…15 In all cases the potential of charge carriers is assumed to be constant over the conductive metal particle. Three profiles were evaluated to describe the particle shapes: a cone, a truncated ellipsoid, and a truncated paraboloid.…”

Section: Simulations Of the Surface Potentialmentioning

confidence: 99%

“…The simulations were carried out for the five samples with a total of ~180 particles using a pre-fixed charge density  S in the support which was determined as described in the companion paper. 15 Figure 8 summarizes the results of the simulations for charges and the derived charge densities as a function of the true (i.e. corrected, see Figure S4 of ESI) particle size R* for all five systems.…”

Section: Simulations Of the Surface Potentialmentioning

confidence: 99%

“…A detailed description of the KPFM method in various applications is available in the literature. 14 The theoretical foundation of the method and the development of data analysis based on different models and exemplified for the typical case of a Pt particle on a TiO 2 support is given in a companion paper (10.1021/acs.jpcc.6b00898), 15 and full details are available in a Ph.D. thesis, which can be accessed online. 16 ■ BACKGROUND Nature of the Kelvin Signal.…”

Section: ■ Introductionmentioning

confidence: 99%

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Charge Polarization at Catalytic Metal–Support Junctions, Part A: Kelvin Probe Force Microscopy Results of Noble Metal Nanoparticles

Kittel

Roduner

2016

J. Phys. Chem. C

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Metal oxide-supported nanoparticles of the platinum group metals Pt, Rh and Pd were studied at ambient temperature and atmosphere using Kelvin probe force microscopy. In all cases, the results reveal electron transfer from the metal to the oxide support which decreases in the order TiO 2 > CeO 2 >> Al 2 O 3 , leading to charge polarization at the Schottky type interfaces analogous to that of a parallel plane capacitor. This polarization cancels out to a large extent for the Kelvin signal. On top of this there is a much smaller number of positive charges at the outer catalyst particle surface, compensated by negative charges near the oxide surface. They show the same trend over the different oxides. These charges determine the constant electrical potential of the metal and are suggested to be the important component of the electronic catalytic metal-support interaction which are known to be much stronger for reducible than for non-reducible oxides.KEYWORDS: Noble metal catalysis; metal oxide support; catalyst-support effect; charge polarization; Kelvin probe microscopy 2

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Metal Clusters Dispersed on Oxide Supports: Preparation Methods and Metal-Support Interactions

Zhang

2018

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Charge Polarization at Catalytic Metal–Support Junctions. Part B: Theoretical Modeling of Kelvin Probe Force Microscopy

Cited by 7 publications

References 31 publications

Postdeposition UV-Ozone Treatment: An Enabling Technique to Enhance the Direct Adhesion of Gold Thin Films to Oxidized Silicon

Postdeposition UV-Ozone Treatment: An Enabling Technique to Enhance the Direct Adhesion of Gold Thin Films to Oxidized Silicon

Charge Polarization at Catalytic Metal–Support Junctions, Part A: Kelvin Probe Force Microscopy Results of Noble Metal Nanoparticles

Metal Clusters Dispersed on Oxide Supports: Preparation Methods and Metal-Support Interactions

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