The role of growth directors in controlling the morphology of hematite nanorods

Allender, Christopher J., Bowen, Jenna L. ORCID: https://orcid.org/0000-0003-1964-6832, Celorrio, Veronica, Davies-Jones, Josh A., Davies, Philip R. ORCID: https://orcid.org/0000-0003-4394-766X, Guan, Shaoliang, O'Reilly, Padraic and Meenakshisundaram, Sankar ORCID: https://orcid.org/0000-0002-7105-0203 2020. The role of growth directors in controlling the morphology of hematite nanorods. Nanoscale Research Letters 15 , 161. 10.1186/s11671-020-03387-w

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Abstract

The control of the growth of hematite nanoparticles from iron chloride solutions under hydrothermal conditions in the presence of two different structure promoters has been studied using a range of both structural and spectroscopic techniques including the first report of photo induced force microscopy (PiFM) to map the topographic distribution of the structure-directing agents on the developing nanoparticles. We show that the shape of the nanoparticles can be controlled using the concentration of phosphate ions up to a limit determined to be ~6 × 10−3 mol. Akaganéite (β-FeOOH) is a major component of the nanoparticles formed in the absence of structure directors but only present in the very early stages (< 8 h) of particle growth when phosphate is present. The PiFM data suggest a correlation between the areas in which phosphate ions are adsorbed and areas where akaganéite persists on the surface. In contrast, goethite (α-FeOOH) is a directly observed precursor of the hematite nanorods when 1,2-diamino propane is present. The PiFM data shows goethite in the center of the developing particles consistent with a mechanism in which the iron hydroxide re-dissolves and precipitates at the nanorod ends as hematite.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Pharmacy Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	SpringerOpen
ISSN:	1931-7573
Funders:	EPSRC and KESS Funded PhD Studenthip
Date of First Compliant Deposit:	12 August 2020
Date of Acceptance:	21 July 2020
Last Modified:	25 Oct 2024 15:31
URI:	https://orca.cardiff.ac.uk/id/eprint/134190

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