Universität zu Köln

Stadler, Daniel ORCID: 0000-0003-3233-9167, Brede, Thomas ORCID: 0000-0002-6041-9052, Schwarzbach, Danny, Maccari, Fernando ORCID: 0000-0002-4585-4179, Fischer, Thomas, Gutfleisch, Oliver ORCID: 0000-0001-8021-3839, Volkert, Cynthia A. and Mathur, Sanjay (2019). Anisotropy control in magnetic nanostructures through field-assisted chemical vapor deposition. Nanoscale Adv., 1 (11). S. 4290 - 4296. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2516-0230

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Abstract

Chemical vapor deposition of iron pentacarbonyl (Fe(CO)(5)) in an external magnetic field (B = 1.00 T) was found to significantly affect the microstructure and anisotropy of as-deposited iron crystallites that could be transformed into anisotropic hematite (alpha-Fe2O3) nanorods by aerobic oxidation. The deterministic influence of external magnetic fields on CVD deposits was found to be substrate-independent as demonstrated by the growth of anisotropic alpha-Fe columns on FTO (F:SnO2) and Si (100), whereas the films deposited in the absence of the magnetic field were constituted by isotropic grains. TEM images revealed gradual increase in average crystallite size in correlation to the increasing field strength and orientation, which indicates the potential of magnetic field-assisted chemical vapor deposition (mfCVD) in controlling the texture of the CVD grown thin films. Given the facet-dependent activity of hematite in forming surface-oxygenated intermediates, exposure of crystalline facets and planes with high atomic density and electron mobilities is crucial for oxygen evolution reactions. The field-induced anisotropy in iron nanocolumns acting as templates for growing textured hematite pillars resulted in two-fold higher photoelectrochemical efficiency for hematite films grown under external magnetic fields (J = 0.050 mA cm(-2)), when compared to films grown in zero field (J = 0.027 mA cm(-2)). The dark current measurements indicated faster surface kinetics as the origin of the increased catalytic activity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Stadler, Daniel UNSPECIFIED orcid.org/0000-0003-3233-9167 UNSPECIFIED Brede, Thomas UNSPECIFIED orcid.org/0000-0002-6041-9052 UNSPECIFIED Schwarzbach, Danny UNSPECIFIED UNSPECIFIED UNSPECIFIED Maccari, Fernando UNSPECIFIED orcid.org/0000-0002-4585-4179 UNSPECIFIED Fischer, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Gutfleisch, Oliver UNSPECIFIED orcid.org/0000-0001-8021-3839 UNSPECIFIED Volkert, Cynthia A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-129291
DOI:	10.1039/c9na00467j
Journal or Publication Title:	Nanoscale Adv.
Volume:	1
Number:	11
Page Range:	S. 4290 - 4296
Date:	2019
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2516-0230
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OXIDE PHOTOANODES; GROWTH; REDUCTION; ARRAYS; FE Multiple languages Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12929