Pulsed laser deposition of heteroepitaxial thin Pt films on MgO(100)

Cillessen, J. F. M.; Wolf, R.M.; Leeuw, D.M. de

doi:10.1016/0040-6090(93)90205-4

Cited by 33 publications

(12 citation statements)

References 6 publications

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“…Apart from the cube-on-cube epitaxy -referred to as [ [57][58][59][60][61][62][63][64][65] . Here we make use of the same notation for the different particle epitaxies as employed in 57 .…”

Section: Methodsmentioning

confidence: 99%

In Situ Oxidation Study of Pt Nanoparticles on MgO(001)

et al. 2013

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Noble metal nanoparticles supported by oxide carriers are widely employed in heterogeneous catalysis. In order to improve catalyst efficiency it is important to understand oxidation processes on the atomic scale. Here we studied oxygen-induced shape changes of Pt nanoparticles on MgO(001) by means of in-situ surface x-ray diffraction (SXRD) and x-ray reflectivity measurements (XRR). The x-ray results on the particle morphology were complemented by transmission electron microscopy (TEM) studies. The samples were prepared by means of physical vapor deposition and differed in average particle size and lateral particle size distribution. The oxygen-induced particle shape changes were found to be independent of particle size * To whom correspondence should be addressed † Max-Planck-Institut für Intelligente Systeme (former Max-Planck-Institut für Metallforschung), Heisenbergstr. and were characterized by the emergence of higher indexed facets. We propose a particle sizedependent oxidation behavior with a kinetically hindered bulk oxide formation. The formed bulk oxide structures were concluded to be (110)-oriented Pt 3 O 4 and a modified structure of (0001)-oriented α-PtO 2 . CO exposure of the oxidized particles did not lead to a shape change reversibility.

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“…Apart from the cube-on-cube epitaxy -referred to as [ [57][58][59][60][61][62][63][64][65] . Here we make use of the same notation for the different particle epitaxies as employed in 57 .…”

Section: Methodsmentioning

confidence: 99%

In Situ Oxidation Study of Pt Nanoparticles on MgO(001)

et al. 2013

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“…In alloys, rocking curves of films often show a much sharper texture in the case of PLD. Epitaxial growth at room temperature has been observed for Pt films on MgO by Cillessen et al [1993] or Mo on Al 2 O 3 by Malikov and Mikhailov [1997]. Epitaxial growth at room temperature was also observed for Cu or Fe on Ag (and vice versa) by in situ reflection/ transmission high energy electron diffraction (RHEED/THEED) by Fähler et al [2000].…”

Section: Improved Film Growthmentioning

confidence: 83%

Pulsed Laser Deposition of Metals

Krebs

2006

Pulsed Laser Deposition of Thin Films

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“…Naturally, one possibility for a homogenous and surely interconnected Pt film would be to produce films of relatively large thickness. For instance, Cillessen et al showed that above a critical thickness of 40 nm, Pt films fully covered the substrate. However, it has to be taken into account that the strain energy induced by lattice misfit increases with increasing thickness and in turn also the probability of inserting misfit dislocations to release the stress .…”

Section: Resultsmentioning

confidence: 99%

“…Several studies have been dedicated to the PLD growth of (111)‐ and (001)‐oriented Pt films. For instance, (111)‐oriented Pt films were successfully grown on (100) yttrium‐stabilized zirconia (YSZ) at substrate temperatures from 200–800 °C .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, (111)‐oriented Pt films were successfully grown on (100) yttrium‐stabilized zirconia (YSZ) at substrate temperatures from 200–800 °C . Epitaxial (100) Pt films were successfully produced on (100) MgO heated up to 700 °C, despite the relatively large lattice mismatch (7%) between the two materials. The latter study showed that crucial parameters to favor the growth along the (100) direction—while suppressing the (111) orientation—were the oxygen partial pressure of the background atmosphere and the deposition rate.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the Surface Electrochemistry by Strained Epitaxial Pt Thin Film Model Electrodes Prepared by Pulsed Laser Deposition

Temmel

Fabbri

Pergolesi

et al. 2016

Adv Materials Inter

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toward different reactions such as methanol [ 1 ] or ethanol [ 2,3 ] oxidation, hydrogen oxidation, [ 4 ] and oxygen reduction reaction. [ 5,6 ] However, the slow kinetics of some of these reactions results in great losses concerning the respective energy conversion effi ciencies. This drawback, together with Pt dissolution phenomena requires a large amount of Pt at the electrode. The accompanying cost and scarcity of Pt represent the prime impediments toward a broad practical application of fuel cells. Electrode interface properties play a decisive role in controlling the electrocatalytic performance. [ 7 ] Since Pt-based materials are to date the best electrocatalysts for these reactions, [ 8 ] extensive research has been dedicated to develop novel Pt-based catalyst architectures with a specifi cally tailored electrode-electrolyte interface. In recent years it has been demonstrated that strain on metal surfaces can have a signifi cant impact on the adsorbate's binding energies and on the activation energy barrier for adsorption processes. [ 9 ] In this regard, core-shell nanoparticles (NPs), where an outer monolayer (ML) of Pt is supported on another metal [ 10,11 ] or on Pt-alloy NPs [ 12 ] have been designed. The strain in these systems is generated due to the difference in lattice constant between the outer ML and the core of the NP. When the top ML adapts its crystal lattice to the underlying core lattice, depending on the sign of the lattice misfi t the ensuing stress induces tensile or compressive lattice distortions (strain).In general, surface strain can also be generated by deposition of ultrathin (few ML thick) metal fi lms on substrates. [ 3,[13][14][15] One strategy utilizes the galvanic displacement of an underpotentially deposited (UPD) copper-ML by Pt on various substrates. [ 3,13 ] The strained Pt MLs reveal a substantial increase in activity toward methanol and ethanol electrooxidation. The electrochemical behavior of ultrathin Pt fi lms of varying thickness evaporated on Ru(0001) substrates was also examined by cyclic voltammetry (CV). [ 16 ] It was found that the reversible adsorption of H and OH strongly depends on the Pt thickness and in turn the extent of the strain induced in the Pt surface. Recently, another approach involved growing ultrathin Pt fi lms on W(111) substrates with varying Pt thickness of 2.2, 3.3, and A novel approach for tailoring strained Pt model electrocatalysts using pulsed laser deposition is presented. The physical properties of Pt fi lms grown on single-crystalline (100)-and (111)-oriented strontium titanate depend signifi cantly on the various deposition parameters (e.g., fl uence, temperature, background atmosphere, postannealing, and number of process steps), as revealed by scanning electron microscopy and X-ray studies. By properly selecting the deposition conditions, thin, epitaxial, and strained (100)-and (111)-oriented Pt fi lms suitable as model electrodes can be prepared. Cyclic voltammetry measurements indicate that the strain in the Pt fi lms changes sig...

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Pulsed laser deposition of heteroepitaxial thin Pt films on MgO(100)

Cited by 33 publications

References 6 publications

In Situ Oxidation Study of Pt Nanoparticles on MgO(001)

In Situ Oxidation Study of Pt Nanoparticles on MgO(001)

Pulsed Laser Deposition of Metals

Tuning the Surface Electrochemistry by Strained Epitaxial Pt Thin Film Model Electrodes Prepared by Pulsed Laser Deposition

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