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Issue 26, 2011
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Highly defective MgO nanosheets from colloidal self-assembly

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Abstract

Highly defective magnesium oxide nanosheets were synthesized using a colloidal synthesis in which magnesium ethoxide was thermally decomposed in high-boiling-point weakly coordinating solvents. The nanosheets were assembled of small nanocrystal building blocks by oriented attachment. This assembly could be inhibited by using a strongly coordinating surfactant, such as oleic acid. The 2–3 nm spaced extended defects formed at the grain boundaries make up a material with a record defect density which causes an increased conductivity and dielectric constant, strong luminescence and paramagnetism. The point defect type prevailing at those interfaces is apparently charged oxygen vacancies. In situTEM annealing experiments showed that the extended defects begin to anneal out at temperatures as low as 300 °C, but a high density of point defects apparently survives even at 750 °C.

Graphical abstract: Highly defective MgO nanosheets from colloidal self-assembly

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Publication details

The article was received on 12 Jan 2011, accepted on 04 May 2011 and first published on 02 Jun 2011


Article type: Paper
DOI: 10.1039/C1JM10181A
Citation: J. Mater. Chem., 2011,21, 9532-9537
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    Highly defective MgO nanosheets from colloidal self-assembly

    B. M. Maoz, E. Tirosh, M. B. Sadan, I. Popov, Y. Rosenberg and G. Markovich, J. Mater. Chem., 2011, 21, 9532
    DOI: 10.1039/C1JM10181A

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