A Novel Approach to Obtaining Metal Oxide HAR Nanostructures by Electrospinning and ALD

In this work, a novel approach is suggested to grow bilayer fibers by combining electrospinning and atomic layer deposition (ALD). Polyvinyl alcohol (PVA) fibers are obtained by electrospinning and subsequently covered with thin Al O deposited at a low temperature by ALD. To burn the PVA core, the f...

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Bibliographic Details
Published in:Materials 2023-12, Vol.16 (23), p.7489
Main Authors: Blagoev, Blagoy S, Georgieva, Borislava, Starbova, Kirilka, Starbov, Nikolay, Avramova, Ivalina, Buchkov, Krastyo, Tzvetkov, Peter, Stoykov, Rumen, Terziyska, Penka, Delibaltov, Damyan, Mehandzhiev, Vladimir, Paskaleva, Albena
Format: Article
Language:English
Subjects:
Aluminum oxide
Annealing
Atomic layer epitaxy
Calorimetry
Catalysis
Electron microscopes
Ellipsometry
Energy consumption
Fibers
Glass substrates
High temperature
Low temperature
Metal oxides
Nanomaterials
Nitrogen
Polymers
Polyvinyl alcohol
Scanning electron microscopy
Stoichiometry
Temperature
X ray photoelectron spectroscopy
Zinc oxide
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Summary:In this work, a novel approach is suggested to grow bilayer fibers by combining electrospinning and atomic layer deposition (ALD). Polyvinyl alcohol (PVA) fibers are obtained by electrospinning and subsequently covered with thin Al O deposited at a low temperature by ALD. To burn the PVA core, the fibrous structures are subjected to high-temperature annealing. Differential scanning calorimetry (DSC) analysis of the PVA mat is performed to establish the proper annealing regime for burning off the PVA core and obtaining hollow fibers. The hollow fibers thus formed are covered with a ZnO layer deposited by ALD at a higher temperature within the ALD window of ZnO. This procedure allows us to prepare ZnO films with better crystallinity and stoichiometry. Different characterization methods-SEM, ellipsometry, XRD, and XPS-are performed at each step to investigate the processes in detail.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16237489