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Rare earth oxides/hydroxides are important emerging materials owing to their unique properties. Shape-controlled synthesis of elongated hexagonal bipyramid shaped La(OH)3 nanorods with different aspect ratios and trigram-shaped LaCO3OH nanosheets was systematically carried out by controlling the reaction conditions. Hydrazine and polyvinylpyrrolidone (PVP) surfactants used in synthesis are assumed to play a key "dual-template" role in determining the aspect ratio and shape of the resulting nanostructures. Elongated hexagonal bipyramid shaped La(OH)3 nanorods were found to grow along the preferred orientation [0001]. Six equivalent crystallographic facets, (202¯0),(022¯0),(22¯00), (02¯20),(2¯200), and (2¯020) lattice planes, were found to be exposed on the side surfaces on each nanorod as confirmed by combined transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) analyses. A double-polarization phenomenon was found to occur at the nanorod surfaces by employing off-axis electron holography, implying that the material could be used as an effective dielectric microwave absorber. La(OH)3 nanorods with larger aspect ratios exhibit better absorption properties with respect to the maximum reflection loss and effective absorbing bandwidth. Thus, a novel method towards the reasonable design of bipyramid shaped La(OH)3 nanorods exhibiting tunable microwave absorption properties is proposed based on our synthesis strategy.

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Publication history

Received: 11 February 2016
Revised: 09 May 2016
Accepted: 10 May 2016
Published: 13 June 2016
Issue date: September 2016

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© Tsinghua University Press and Springer‐Verlag Berlin Heidelberg 2016

Acknowledgements

Acknowledgements

This work was supported by the National Basic Research Program of China (973 Project, No. 2013CB932901), and the National Natural Science Foundation of China (Nos. 11274066, 51172047, 51102050, amd U1330118). This project was sponsored by Shanghai Pujiang Program and "Shu Guang" project of Shanghai Municipal Education Commission and Shanghai Education Development Foundation (No. 09SG01).

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Email: nanores@tup.tsinghua.edu.cn

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