Issue 44, 2011

CO2-assisted template synthesis of porous hollow bi-phase γ-/α-Fe2O3nanoparticles with high sensor property

Abstract

In this contribution, monodisperse porous hollow bi-phase γ-/α-Fe2O3 nanoparticles were successfully fabricated based on hard-template method with using carbon colloids as sacrificial templates. A new concept of assembling one kind of metal oxide with different crystalline structures into a single shell was presented for the first time. The critical procedure of coating carbon cores with a uniform layer of oxide was performed in CO2-expanded ethanol, which is a versatile way to produce high-quality hollow oxide nanoparticles. The formation of the novel bi-phase shell was achieved through combining the reduction ability of carbon cores under inert calcination atmosphere and the unique chemical composition of intermediate-shell formed in CO2-expanded ethanol. The porous hollow γ-/α-Fe2O3 nanoparticles with an average diameter of 99 nm not only possess combined properties of γ-Fe2O3 and α-Fe2O3, but also have a large specific surface area of 93.7 m2 g−1 and a high pore volume of 1.056 cm3 g−1, enabling them to have widespread applications in sensors, catalysis, magnetic and electrochemical areas, etc. Herein, such hollow bi-phase γ-/α-Fe2O3 nanoparticles were utilized to prepare a sensor device, and intriguingly it shows higher sensitivity and selectivity to ethanol than γ-Fe2O3 powders and many other porous α-Fe2O3 materials reported recently. The probable sensor mechanism of hollow γ-/α-Fe2O3 nanoparticles was discussed in detail.

Graphical abstract: CO2-assisted template synthesis of porous hollow bi-phase γ-/α-Fe2O3 nanoparticles with high sensor property

Supplementary files

Article information

Article type
Paper
Submitted
22 Jun 2011
Accepted
02 Sep 2011
First published
10 Oct 2011

J. Mater. Chem., 2011,21, 17776-17782

CO2-assisted template synthesis of porous hollow bi-phase γ-/α-Fe2O3 nanoparticles with high sensor property

J. Ming, Y. Wu, L. Wang, Y. Yu and F. Zhao, J. Mater. Chem., 2011, 21, 17776 DOI: 10.1039/C1JM12879E

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