Defects in oxygen-depleted titanate nanostructures

Vittadini A, Schirmer M, Walz MM, Vollnhals F, Lukasczyk T, Steinrück HP, Marbach H, Riss A, Elser MJ, Schürer B, Diwald O (2012)

Publication Type: Journal article, Original article

Publication year: 2012

Journal

Langmuir American Chemical Society

Original Authors: Vittadini A., Schirmer M., Walz M.-M., Vollnhals F., Lukasczyk T., Steinrück H.-P., Marbach H., Riss A., Elser M.J., Schürer B., Diwald O.

Publisher: American Chemical Society

Book Volume: 28

Pages Range: 7851-7858

Journal Issue: 20

DOI: 10.1021/la301129v

Abstract

The identification of defects and their controlled generation in titanate nanostructures is a key to their successful application in photoelectronic devices. We comprehensively explored the effect of vacuum annealing on morphology and composition of Na Ti O nanowires and protonated H Ti O nanoscrolls using a combination of scanning electron microscopy, Auger and Fourier-transform infrared (FT-IR) spectroscopy, as well as ab initio density functional theory (DFT) calculations. The observation that H Ti O nanoscrolls are more susceptible to electronic reduction and annealing-induced n-type doping than Na Ti O nanowires is attributed to the position of the conduction band minimum. It is close to the vacuum level and, thus, favors the Fermi level-induced compensation of donor states by cation vacancies. In agreement with theoretical predictions that suggest similar formation energies for oxygen and sodium vacancies, we experimentally observed the annealing induced depletion of sodium from the surface of the nanowires. © 2012 American Chemical Society.

Authors with CRIS profile

Michael Schirmer Lehrstuhl für Physikalische Chemie II Marie-Madeleine Walz Lehrstuhl für Physikalische Chemie II Florian Vollnhals Lehrstuhl für Physikalische Chemie II Hans-Peter Steinrück Lehrstuhl für Physikalische Chemie II Hubertus Marbach Naturwissenschaftliche Fakultät Oliver Diwald Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials

Involved external institutions

University of Padua / Universita degli Studi di Padova IT Italy (IT) University of California, Berkeley US United States (USA) (US)

How to cite

APA:

Vittadini, A., Schirmer, M., Walz, M.-M., Vollnhals, F., Lukasczyk, T., Steinrück, H.-P.,... Diwald, O. (2012). Defects in oxygen-depleted titanate nanostructures. Langmuir, 28(20), 7851-7858. https://dx.doi.org/10.1021/la301129v

MLA:

Vittadini, Andrea, et al. "Defects in oxygen-depleted titanate nanostructures." Langmuir 28.20 (2012): 7851-7858.

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