Ferroelectric polarization dependent interactions at Pd–LiNbO3(0001) interfaces

Zhao, Mosha H.; Bonnell, Dawn A.; Vohs, John M.

doi:10.1116/1.3248268

Cited by 10 publications

(1 citation statement)

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“…This is not surprising since although the polarization surface charge density (σ = P .n) is large in canonical ferroelectrics and is in the range of 0. In the same year, Zhao et al studied the same system using a combination of Auger electron spectroscopy (AES) and TPD [181]. They found that at 300 K, vapor-deposited Pd lms grew in a layer-by-layer fashion on the negatively polarized LiNbO 3 (0001) surface, in contrast to the positively poled surface where they formed 3D clusters for otherwise identical growth conditions.…”

Section: Ferroelectrics Modied By Transition Metalsmentioning

confidence: 99%

Ferroelectrics: A pathway to switchable surface chemistry and catalysis

2016

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It has been known for more than six decades that ferroelectricity can aect a material's surface physics and chemistry thereby potentially enhancing its catalytic properties. Ferroelectrics are a class of materials with a switchable electrical polarization that can aect surface stoichiometry and electronic structure and thus adsorption energies and modes; e.g., molecular versus dissociative. Therefore, ferroelectrics may be utilized to achieve switchable surface chemistry whereby surface properties are not xed but can be dynamically controlled by, for example, applying an external electric eld or modulating the temperature. Several important examples of applications of ferroelectric and polar materials in photocatalysis and heterogeneous catalysis are discussed. In photocatalysis, the polarization direction can control band bending at water/ferroelectric and ferroelectric/semiconductor interfaces, thereby facilitating charge separation and transfer to the electrolyte and enhancing photocatalytic activity. For gas-surface interactions, available results suggest that using ferroelectrics as supports for catalytically active transition metals and oxides is another way to enhance catalytic activity. Finally, the possibility of incorporating ferroelectric switching into the catalytic cycle itself is described. In this scenario, a dynamic collaboration of two polarization states can be used to drive reactions that have been historically challenging to achieve on surfaces with xed chemical properties (e.g., direct NO x decomposition and the selective partial oxidation of methane). These predictions show that dynamic modulation of the polarization can help overcome some of the fundamental limitations on catalytic activity imposed by the Sabatier principle.

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Section: Ferroelectrics Modied By Transition Metalsmentioning

confidence: 99%

Ferroelectrics: A pathway to switchable surface chemistry and catalysis

2016

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Controlling Polarization Dependent Reactions to Fabricate Multi‐Component Functional Nanostructures

Conklin

Park

Nanayakkara

et al. 2011

Adv Funct Materials

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In spite of novel lithographic processes that enable new approaches to fabricating materials, directed assembly of multi‐component hybrid devices remains a challenge. Ferroelectric nanolithography exploits polarization dependent surface interactions to pattern nanoparticles, but the factors that control the particle size and distribution are not sufficiently well understood to produce hybrid nanostructures. Here the effects of photon energy, photon flux, and polarization vector orientation on ferroelectric domain specific photoreactions are quantified, leading to an understanding of the nanoparticle deposition mechanism. Patterned nanoparticle arrays functionalized with optically active porphyrin complexes are configured into optoelectronic devices.

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