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

Allender, Christopher J., Bowen, Jenna L. ORCID:, Celorrio, Veronica, Davies-Jones, Josh A., Davies, Philip R. ORCID:, Guan, Shaoliang, O'Reilly, Padraic and Meenakshisundaram, Sankar ORCID: 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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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
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: 05 May 2023 19:01

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