Temperature-triggered self-assembly of ZnO: From nanocrystals to nanorods to tablets

Yong Hu; Ting Mei; Jun Guo; Tim White

doi:10.1021/ic700863g

Temperature-triggered self-assembly of ZnO: From nanocrystals to nanorods to tablets

Yong Hu^*, Ting Mei, Jun Guo, Tim White

^*Corresponding author for this work

Nanyang Technological University

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

25 Citations (Scopus)

Abstract

ZnO nanocrystals, nanorods, and tablets were prepared at 110, 140, and 180°C in a water-ethanol system. Nanorods (∼2 x 40 nm) arranged in serpentine morphologies formed by the oriented coalescence of anhedral ZnO nanocrystals (∼3.5 nm diameter), while tabular ZnO grew by [1210] textural attachment of the nanorods. The development of these crystal habits is believed to proceed via a dissolution and growth mechanism mediated by a transient amorphous phase. Materials synthesized at intermediate temperatures (125 and 160°C) possessed microstructures containing mixed crystal forms in the expected orientation relationship. Photoluminescent spectra of the nanocrystals and nanorods showed blue shifts of 0.16 and 0.13 eV with respect to the bulk ZnO band gap (3.26 eV) due to quantum confinement, with the narrow emission peaks typical of particles possessing uniform size and shape. The larger tablets displayed a less energetic emission (3.10 eV) ascribed to exciton-exciton collisions.

Original language	English
Pages (from-to)	11031-11035
Number of pages	5
Journal	Inorganic Chemistry
Volume	46
Issue number	26
DOIs	https://doi.org/10.1021/ic700863g
Publication status	Published - Dec 24 2007
Externally published	Yes

ASJC Scopus Subject Areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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title = "Temperature-triggered self-assembly of ZnO: From nanocrystals to nanorods to tablets",

abstract = "ZnO nanocrystals, nanorods, and tablets were prepared at 110, 140, and 180°C in a water-ethanol system. Nanorods (∼2 x 40 nm) arranged in serpentine morphologies formed by the oriented coalescence of anhedral ZnO nanocrystals (∼3.5 nm diameter), while tabular ZnO grew by [1210] textural attachment of the nanorods. The development of these crystal habits is believed to proceed via a dissolution and growth mechanism mediated by a transient amorphous phase. Materials synthesized at intermediate temperatures (125 and 160°C) possessed microstructures containing mixed crystal forms in the expected orientation relationship. Photoluminescent spectra of the nanocrystals and nanorods showed blue shifts of 0.16 and 0.13 eV with respect to the bulk ZnO band gap (3.26 eV) due to quantum confinement, with the narrow emission peaks typical of particles possessing uniform size and shape. The larger tablets displayed a less energetic emission (3.10 eV) ascribed to exciton-exciton collisions.",

author = "Yong Hu and Ting Mei and Jun Guo and Tim White",

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T2 - From nanocrystals to nanorods to tablets

AU - Hu, Yong

AU - Mei, Ting

AU - Guo, Jun

AU - White, Tim

PY - 2007/12/24

Y1 - 2007/12/24

N2 - ZnO nanocrystals, nanorods, and tablets were prepared at 110, 140, and 180°C in a water-ethanol system. Nanorods (∼2 x 40 nm) arranged in serpentine morphologies formed by the oriented coalescence of anhedral ZnO nanocrystals (∼3.5 nm diameter), while tabular ZnO grew by [1210] textural attachment of the nanorods. The development of these crystal habits is believed to proceed via a dissolution and growth mechanism mediated by a transient amorphous phase. Materials synthesized at intermediate temperatures (125 and 160°C) possessed microstructures containing mixed crystal forms in the expected orientation relationship. Photoluminescent spectra of the nanocrystals and nanorods showed blue shifts of 0.16 and 0.13 eV with respect to the bulk ZnO band gap (3.26 eV) due to quantum confinement, with the narrow emission peaks typical of particles possessing uniform size and shape. The larger tablets displayed a less energetic emission (3.10 eV) ascribed to exciton-exciton collisions.

AB - ZnO nanocrystals, nanorods, and tablets were prepared at 110, 140, and 180°C in a water-ethanol system. Nanorods (∼2 x 40 nm) arranged in serpentine morphologies formed by the oriented coalescence of anhedral ZnO nanocrystals (∼3.5 nm diameter), while tabular ZnO grew by [1210] textural attachment of the nanorods. The development of these crystal habits is believed to proceed via a dissolution and growth mechanism mediated by a transient amorphous phase. Materials synthesized at intermediate temperatures (125 and 160°C) possessed microstructures containing mixed crystal forms in the expected orientation relationship. Photoluminescent spectra of the nanocrystals and nanorods showed blue shifts of 0.16 and 0.13 eV with respect to the bulk ZnO band gap (3.26 eV) due to quantum confinement, with the narrow emission peaks typical of particles possessing uniform size and shape. The larger tablets displayed a less energetic emission (3.10 eV) ascribed to exciton-exciton collisions.

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Temperature-triggered self-assembly of ZnO: From nanocrystals to nanorods to tablets

Abstract

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