Crystallization-induced top-down wormlike hierarchical porous α-Fe2O3 self-assembly

Ramakrishnan Amutha; Manickavachagam Muruganandham; Marappan Sathish; Sambandam Akilandeswari; Rominder P.S. Suri; Eveliina Repo; Mika Sillanpää

doi:10.1021/jp200301g

Crystallization-induced top-down wormlike hierarchical porous α-Fe₂O₃ self-assembly

Ramakrishnan Amutha, Manickavachagam Muruganandham, Marappan Sathish, Sambandam Akilandeswari, Rominder P.S. Suri, Eveliina Repo, Mika Sillanpää

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

In the first large-scale investigation we found a novel crystallization-induced fabrication of top-down wormlike hierarchical porous hematite self-assembly (WHHS). WHHS results in the crystallization of stable amorphous iron oxide microbundles at higher temperatures (400 °C). Oxalic acid was successfully used as both a complexing and an etching agent for the preparation; etching induced a morphological transition from microbundles to microsheets. The preparation method of the ferric oxalate complex is a crucial step for the formation of WHHS. The synthesized ferric oxalate and WHHS was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), Raman spectra, FTIR, and nitrogen adsorption analysis. We investigated the influence of decomposition temperatures and concentration of both oxalate and iron precursors on the formation of WHHS and its surface properties as well as the magnetic and electrochemical properties of the synthesized WHHS. The WHHS showed weak ferromagnetic properties. We also examined a plausible WHHS formation mechanism.

Original language	English
Pages (from-to)	6367-6374
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	115
Issue number	14
DOIs	https://doi.org/10.1021/jp200301g
Publication status	Published - 14 Apr 2011
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp200301g

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title = "Crystallization-induced top-down wormlike hierarchical porous α-Fe2O3 self-assembly",

abstract = "In the first large-scale investigation we found a novel crystallization-induced fabrication of top-down wormlike hierarchical porous hematite self-assembly (WHHS). WHHS results in the crystallization of stable amorphous iron oxide microbundles at higher temperatures (400 °C). Oxalic acid was successfully used as both a complexing and an etching agent for the preparation; etching induced a morphological transition from microbundles to microsheets. The preparation method of the ferric oxalate complex is a crucial step for the formation of WHHS. The synthesized ferric oxalate and WHHS was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), Raman spectra, FTIR, and nitrogen adsorption analysis. We investigated the influence of decomposition temperatures and concentration of both oxalate and iron precursors on the formation of WHHS and its surface properties as well as the magnetic and electrochemical properties of the synthesized WHHS. The WHHS showed weak ferromagnetic properties. We also examined a plausible WHHS formation mechanism.",

author = "Ramakrishnan Amutha and Manickavachagam Muruganandham and Marappan Sathish and Sambandam Akilandeswari and Suri, {Rominder P.S.} and Eveliina Repo and Mika Sillanp{\"a}{\"a}",

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doi = "10.1021/jp200301g",

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T1 - Crystallization-induced top-down wormlike hierarchical porous α-Fe2O3 self-assembly

AU - Amutha, Ramakrishnan

AU - Muruganandham, Manickavachagam

AU - Sathish, Marappan

AU - Akilandeswari, Sambandam

AU - Suri, Rominder P.S.

AU - Repo, Eveliina

AU - Sillanpää, Mika

PY - 2011/4/14

Y1 - 2011/4/14

N2 - In the first large-scale investigation we found a novel crystallization-induced fabrication of top-down wormlike hierarchical porous hematite self-assembly (WHHS). WHHS results in the crystallization of stable amorphous iron oxide microbundles at higher temperatures (400 °C). Oxalic acid was successfully used as both a complexing and an etching agent for the preparation; etching induced a morphological transition from microbundles to microsheets. The preparation method of the ferric oxalate complex is a crucial step for the formation of WHHS. The synthesized ferric oxalate and WHHS was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), Raman spectra, FTIR, and nitrogen adsorption analysis. We investigated the influence of decomposition temperatures and concentration of both oxalate and iron precursors on the formation of WHHS and its surface properties as well as the magnetic and electrochemical properties of the synthesized WHHS. The WHHS showed weak ferromagnetic properties. We also examined a plausible WHHS formation mechanism.

AB - In the first large-scale investigation we found a novel crystallization-induced fabrication of top-down wormlike hierarchical porous hematite self-assembly (WHHS). WHHS results in the crystallization of stable amorphous iron oxide microbundles at higher temperatures (400 °C). Oxalic acid was successfully used as both a complexing and an etching agent for the preparation; etching induced a morphological transition from microbundles to microsheets. The preparation method of the ferric oxalate complex is a crucial step for the formation of WHHS. The synthesized ferric oxalate and WHHS was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), Raman spectra, FTIR, and nitrogen adsorption analysis. We investigated the influence of decomposition temperatures and concentration of both oxalate and iron precursors on the formation of WHHS and its surface properties as well as the magnetic and electrochemical properties of the synthesized WHHS. The WHHS showed weak ferromagnetic properties. We also examined a plausible WHHS formation mechanism.

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JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 14

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Crystallization-induced top-down wormlike hierarchical porous α-Fe₂O₃ self-assembly

Abstract

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