Enhanced surface-and-interface coupling in Pd-nanoparticle-coated LaAlO3/SrTiO3heterostructures: Strong gas- and photo-induced conductance modulation

Haeri Kim; Ngai Yui Chan; Jiyan Dai; Dong Wook Kim

doi:10.1038/srep08531

Enhanced surface-and-interface coupling in Pd-nanoparticle-coated LaAlO₃/SrTiO₃heterostructures: Strong gas- and photo-induced conductance modulation

Haeri Kim, Ngai Yui Chan, Jiyan Dai, Dong Wook Kim

Research output: Journal article publication › Journal article › Academic research › peer-review

30 Citations (Scopus)

Abstract

Pd nanoparticle (NP) coated LaAlO3/SrTiO3(LAO/STO) heterointerface exhibits more notable conductance (G) change while varying the ambient gas (N2, H2/N2, and O2) and illuminating with UV light (wavelength: 365 nm) than a sample without the NPs. Simultaneous Kelvin probe force microscopy and transport measurements reveal close relationships between the surface work function (W) and G of the samples. Quantitative analyses suggest that a surface adsorption/desorption-mediated reaction and redox, resulting in a band-alignment modification and charge-transfer, could explain the gas- and photo-induced conductance modulation at the LAO/STO interface. Such surface-and-interface coupling enhanced by catalytic Pd NPs is a unique feature, quite distinct from conventional semiconductor hetero-junctions, which enables the significant conductance tunability at ultrathin oxide heterointerfaces by external stimuli.

Original language	English
Article number	8531
Journal	Scientific Reports
Volume	5
DOIs	https://doi.org/10.1038/srep08531
Publication status	Published - 1 Jan 2014

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10.1038/srep08531

http://hdl.handle.net/10397/27375

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title = "Enhanced surface-and-interface coupling in Pd-nanoparticle-coated LaAlO3/SrTiO3heterostructures: Strong gas- and photo-induced conductance modulation",

abstract = "Pd nanoparticle (NP) coated LaAlO3/SrTiO3(LAO/STO) heterointerface exhibits more notable conductance (G) change while varying the ambient gas (N2, H2/N2, and O2) and illuminating with UV light (wavelength: 365 nm) than a sample without the NPs. Simultaneous Kelvin probe force microscopy and transport measurements reveal close relationships between the surface work function (W) and G of the samples. Quantitative analyses suggest that a surface adsorption/desorption-mediated reaction and redox, resulting in a band-alignment modification and charge-transfer, could explain the gas- and photo-induced conductance modulation at the LAO/STO interface. Such surface-and-interface coupling enhanced by catalytic Pd NPs is a unique feature, quite distinct from conventional semiconductor hetero-junctions, which enables the significant conductance tunability at ultrathin oxide heterointerfaces by external stimuli.",

author = "Haeri Kim and Chan, {Ngai Yui} and Jiyan Dai and Kim, {Dong Wook}",

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AU - Kim, Haeri

AU - Chan, Ngai Yui

AU - Dai, Jiyan

AU - Kim, Dong Wook

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AB - Pd nanoparticle (NP) coated LaAlO3/SrTiO3(LAO/STO) heterointerface exhibits more notable conductance (G) change while varying the ambient gas (N2, H2/N2, and O2) and illuminating with UV light (wavelength: 365 nm) than a sample without the NPs. Simultaneous Kelvin probe force microscopy and transport measurements reveal close relationships between the surface work function (W) and G of the samples. Quantitative analyses suggest that a surface adsorption/desorption-mediated reaction and redox, resulting in a band-alignment modification and charge-transfer, could explain the gas- and photo-induced conductance modulation at the LAO/STO interface. Such surface-and-interface coupling enhanced by catalytic Pd NPs is a unique feature, quite distinct from conventional semiconductor hetero-junctions, which enables the significant conductance tunability at ultrathin oxide heterointerfaces by external stimuli.

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Enhanced surface-and-interface coupling in Pd-nanoparticle-coated LaAlO₃/SrTiO₃heterostructures: Strong gas- and photo-induced conductance modulation

Abstract

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