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Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests
In order to enable advanced technological applications of nanocrystal composites, e.g., as functional coatings and layers in flexible optics and electronics, it is necessary to understand and control their mechanical properties. The objective of this study was to show how the elasticity of such comp...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6780250/ https://www.ncbi.nlm.nih.gov/pubmed/31470667 http://dx.doi.org/10.3390/nano9091230 |
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author | Hensel, Andreas Schröter, Clemens J. Schlicke, Hendrik Schulz, Norbert Riekeberg, Svenja Trieu, Hoc Khiem Stierle, Andreas Noei, Heshmat Weller, Horst Vossmeyer, Tobias |
author_facet | Hensel, Andreas Schröter, Clemens J. Schlicke, Hendrik Schulz, Norbert Riekeberg, Svenja Trieu, Hoc Khiem Stierle, Andreas Noei, Heshmat Weller, Horst Vossmeyer, Tobias |
author_sort | Hensel, Andreas |
collection | PubMed |
description | In order to enable advanced technological applications of nanocrystal composites, e.g., as functional coatings and layers in flexible optics and electronics, it is necessary to understand and control their mechanical properties. The objective of this study was to show how the elasticity of such composites depends on the nanocrystals’ dimensionality. To this end, thin films of titania nanodots (TNDs; diameter: ~3–7 nm), nanorods (TNRs; diameter: ~3.4 nm; length: ~29 nm), and nanoplates (TNPs; thickness: ~6 nm; edge length: ~34 nm) were assembled via layer-by-layer spin-coating. 1,12-dodecanedioic acid (12DAC) was added to cross-link the nanocrystals and to enable regular film deposition. The optical attenuation coefficients of the films were determined by ultraviolet/visible (UV/vis) absorbance measurements, revealing much lower values than those known for titania films prepared via chemical vapor deposition (CVD). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed a homogeneous coverage of the substrates on the µm-scale but a highly disordered arrangement of nanocrystals on the nm-scale. X-ray photoelectron spectroscopy (XPS) analyses confirmed the presence of the 12DAC cross-linker after film fabrication. After transferring the films onto silicon substrates featuring circular apertures (diameter: 32–111 µm), freestanding membranes (thickness: 20–42 nm) were obtained and subjected to atomic force microscopy bulge tests (AFM-bulge tests). These measurements revealed increasing elastic moduli with increasing dimensionality of the nanocrystals, i.e., 2.57 ± 0.18 GPa for the TND films, 5.22 ± 0.39 GPa for the TNR films, and 7.21 ± 1.04 GPa for the TNP films. |
format | Online Article Text |
id | pubmed-6780250 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-67802502019-10-30 Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests Hensel, Andreas Schröter, Clemens J. Schlicke, Hendrik Schulz, Norbert Riekeberg, Svenja Trieu, Hoc Khiem Stierle, Andreas Noei, Heshmat Weller, Horst Vossmeyer, Tobias Nanomaterials (Basel) Article In order to enable advanced technological applications of nanocrystal composites, e.g., as functional coatings and layers in flexible optics and electronics, it is necessary to understand and control their mechanical properties. The objective of this study was to show how the elasticity of such composites depends on the nanocrystals’ dimensionality. To this end, thin films of titania nanodots (TNDs; diameter: ~3–7 nm), nanorods (TNRs; diameter: ~3.4 nm; length: ~29 nm), and nanoplates (TNPs; thickness: ~6 nm; edge length: ~34 nm) were assembled via layer-by-layer spin-coating. 1,12-dodecanedioic acid (12DAC) was added to cross-link the nanocrystals and to enable regular film deposition. The optical attenuation coefficients of the films were determined by ultraviolet/visible (UV/vis) absorbance measurements, revealing much lower values than those known for titania films prepared via chemical vapor deposition (CVD). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed a homogeneous coverage of the substrates on the µm-scale but a highly disordered arrangement of nanocrystals on the nm-scale. X-ray photoelectron spectroscopy (XPS) analyses confirmed the presence of the 12DAC cross-linker after film fabrication. After transferring the films onto silicon substrates featuring circular apertures (diameter: 32–111 µm), freestanding membranes (thickness: 20–42 nm) were obtained and subjected to atomic force microscopy bulge tests (AFM-bulge tests). These measurements revealed increasing elastic moduli with increasing dimensionality of the nanocrystals, i.e., 2.57 ± 0.18 GPa for the TND films, 5.22 ± 0.39 GPa for the TNR films, and 7.21 ± 1.04 GPa for the TNP films. MDPI 2019-08-29 /pmc/articles/PMC6780250/ /pubmed/31470667 http://dx.doi.org/10.3390/nano9091230 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Hensel, Andreas Schröter, Clemens J. Schlicke, Hendrik Schulz, Norbert Riekeberg, Svenja Trieu, Hoc Khiem Stierle, Andreas Noei, Heshmat Weller, Horst Vossmeyer, Tobias Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests |
title | Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests |
title_full | Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests |
title_fullStr | Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests |
title_full_unstemmed | Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests |
title_short | Elasticity of Cross-Linked Titania Nanocrystal Assemblies Probed by AFM-Bulge Tests |
title_sort | elasticity of cross-linked titania nanocrystal assemblies probed by afm-bulge tests |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6780250/ https://www.ncbi.nlm.nih.gov/pubmed/31470667 http://dx.doi.org/10.3390/nano9091230 |
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