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Nanocrystal size distribution analysis from transmission electron microscopy images
Delft Univ Technol, Photovolta Mat & Devices, NL-2628 CD Delft, Netherlands..
Delft Univ Technol, Pattern Recognit Lab, NL-2628 CD Delft, Netherlands..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Delft Univ Technol, Photovolta Mat & Devices, NL-2628 CD Delft, Netherlands..
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2015 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 7, no 48, 20593-20606 p.Article in journal (Refereed) PublishedText
Abstract [en]

We propose a method, with minimal bias caused by user input, to quickly detect and measure the nanocrystal size distribution from transmission electron microscopy (TEM) images using a combination of Laplacian of Gaussian filters and non-maximum suppression. We demonstrate the proposed method on bright-field TEM images of an a-SiC:H sample containing embedded silicon nanocrystals with varying magnifications and we compare the accuracy and speed with size distributions obtained by manual measurements, a thresholding method and PEBBLES. Finally, we analytically consider the error induced by slicing nanocrystals during TEM sample preparation on the measured nanocrystal size distribution and formulate an equation to correct this effect.

Place, publisher, year, edition, pages
2015. Vol. 7, no 48, 20593-20606 p.
National Category
Other Engineering and Technologies
URN: urn:nbn:se:uu:diva-272431DOI: 10.1039/c5nr06292fISI: 000365982700031PubMedID: 26593390OAI: oai:DiVA.org:uu-272431DiVA: diva2:894332
Available from: 2016-01-14 Created: 2016-01-13 Last updated: 2016-06-15Bibliographically approved
In thesis
1. Electron tomography analysis of 3D order and interfacial structure in nano-precipitates
Open this publication in new window or tab >>Electron tomography analysis of 3D order and interfacial structure in nano-precipitates
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Structural characterization is essential to understand the formation mechanisms of the nanostructures in thin absorber layers in third generation solar cells and amyloid protein aggregates. Since to the dimension of the precipitated structures is in nanometer scale, electron tomography technique in transmission electron microscopy (TEM) has been applied as a major tool to analyze the 3D order and distribution of precipitates using the electron tomography technique. 

Silicon rich silicon carbide (SRSC) films were deposited by plasma enhanced chemical vapor deposition (PECVD) technique and annealed in the nitrogen atmosphere for 1 hour at 1100 °C. The spectrum-imaging (SI) technique in Energy filtered TEM (EFTEM) imaging mode was used to develop electron tomography. From the reconstructed sub-volumes, the complex, three dimensional interfacial nanostructure between the precipitated NPs and their parental matrix was observed and explained in terms of thermodynamic concepts. Additionally, the feasibility of raw data 4D electron tomography has been demonstrated using the EFTEM SI dataset.

The aggregation process of the human islet amyloid polypeptide (hIAPP) has a great impact on human health. In this thesis, a model system has been taken to study the ultrastructure of the hIAPP aggregates that are present in the fat body tissue surrounding the brain of Drosophila melanogaster. Electron tomography technique on TEM revealed clear crystalline structures in 3D. For the first time, the presence of a 5-fold twinned structure in biology was discovered. An intriguing finding is the filament like interconnection of hIAPP protein granules observed predominantly along the nearest neighbor directions. This suggests the existence of the directional binding forces between two nearest protein granules in addition to dipole-dipole interactions.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 84 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1380
Electron tomography, nanoprecipitate, interfacial structure.
National Category
Physical Sciences
Research subject
Materials Science
urn:nbn:se:uu:diva-284102 (URN)978-91-554-9590-9 (ISBN)
Public defence
2016-06-14, Polhemssalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:00 (English)
Available from: 2016-05-23 Created: 2016-04-15 Last updated: 2016-06-15

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