Surfaces of colloidal PbSe nanocrystals probed by thin-film positron annihilation spectroscopy

L. Chai; W. Al-Sawai; Y. Gao; A. J. Houtepen; P. E. Mijnarends; B. Barbiellini; H. Schut; L. C. van Schaarenburg; M. A. van Huis; L. Ravelli; W. Egger; S. Kaprzyk; A. Bansil; S. W. H. Eijt

doi:10.1063/1.4818001

journal article·2013-08-01Open access

Surfaces of colloidal PbSe nanocrystals probed by thin-film positron annihilation spectroscopy

L. Chai, W. Al-Sawai, Y. Gao, A. J. Houtepen, P. E. Mijnarends, B. Barbiellini, H. Schut, L. C. van Schaarenburg, M. A. van Huis, L. Ravelli, W. Egger, S. Kaprzyk, A. Bansil, S. W. H. Eijt

APL Materials· Volume 1· Issue 2

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Source abstract

Abstract

Positron annihilation lifetime spectroscopy and positron-electron momentum density (PEMD) studies on multilayers of PbSenanocrystals (NCs),supported by transmission electron microscopy, show that positrons are strongly trapped at NC surfaces, where they provide insight into the surface composition and electronic structure of PbSeNCs. Our analysis indicates abundant annihilation of positrons with Se electrons at the NC surfaces and with O electrons of the oleic ligands bound to Pb ad-atoms at the NC surfaces, which demonstrates that positrons can be used as a sensitive probe to investigate the surface physics and chemistry of nanocrystals inside multilayers. Ab initio electronic structure calculations provide detailed insight in the valence and semi-core electron contributions to the positron-electron momentum density of PbSe. Both lifetime and PEMD are found to correlate with changes in the particle morphology characteristic of partial ligand removal.

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Research context

Nanomaterials

OpenAlex topics: Quantum Dots Synthesis And Properties · Muon and positron interactions and applications · Nanocluster Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Delft University of Technology 1 Department of Radiation, Radionuclides and Reactors, Faculty of Applied Sciences, , Mekelweg 15, NL-2629 JB Delft, The Netherlands

Northeastern University 2 Physics Department, ,Boston, Massachusetts 02115, USA

Delft University of Technology 3 Department of Chemical Engineering, Faculty of Applied Sciences, , Julianalaan 136, NL-2628 BL Delft, The Netherlands

Delft University of Technology 4 Kavli Institute of Nanoscience, Faculty of Applied Sciences, , Lorentzweg 1, NL-2628 CJ Delft, The Netherlands

Universität der Bundeswehr München 5 Institut für Angewandte Physik und Messtechnik, , Werner-Heisenberg-Weg 39, D-85579 Neubiberg, Germany

Academy of Mining and Metallurgy AGH 6 ,PL-30059 Kraków, Poland

Funding

DOE

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