Structural and optical properties of ZnO nanosaws

Chun Yi Wu, Hsu-Cheng Hsu, Hsin Min Cheng, Song Yang, Wen Feng Hsieh

Research output: Contribution to journalConference article

8 Citations (Scopus)

Abstract

The randomly oriented ZnO nanosaws were synthesized on Si substrates by a simple vapor transport method. For structure characterization of the products, the SEM micrograph clearly reveals that length of nanosaw exceeds several tens of μm and the side of sharp teeth of a saw has a length of about 1-5 μm and diameters of about 100 nm. The results of TEM, XRD, and Raman measurements indicate that the ZnO nanosaw is the single-crystal structure with the wurtzite phase. Under low excitation density, this UV emission peak measured at room temperature is attributed to the recombination of free excitons. Several sharp peaks emerge at photon energy around 3.18 eV with FWHM less than 4 meV when the sample is excited above a certain threshold. We refer that the random lasing in ZnO nanosaws results from the multiple coherent scattering in highly random-oriented ZnO nanosaws.

Original languageEnglish
Pages (from-to)189-193
Number of pages5
JournalJournal of Crystal Growth
Volume287
Issue number1
DOIs
Publication statusPublished - 2006 Jan 18
EventProceedings of the International Conference on Materials for Advanced Technologies (ICMAT 2005) Symposium N ZnO and Related Materials -
Duration: 2005 Jul 32005 Jul 8

Fingerprint

Nanosaws
Structural properties
Optical properties
optical properties
coherent scattering
teeth
wurtzite
lasing
excitons
vapors
transmission electron microscopy
scanning electron microscopy
crystal structure
thresholds
single crystals
Coherent scattering
photons
room temperature
products
Multiple scattering

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Wu, Chun Yi ; Hsu, Hsu-Cheng ; Cheng, Hsin Min ; Yang, Song ; Hsieh, Wen Feng. / Structural and optical properties of ZnO nanosaws. In: Journal of Crystal Growth. 2006 ; Vol. 287, No. 1. pp. 189-193.
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Structural and optical properties of ZnO nanosaws. / Wu, Chun Yi; Hsu, Hsu-Cheng; Cheng, Hsin Min; Yang, Song; Hsieh, Wen Feng.

In: Journal of Crystal Growth, Vol. 287, No. 1, 18.01.2006, p. 189-193.

Research output: Contribution to journalConference article

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T1 - Structural and optical properties of ZnO nanosaws

AU - Wu, Chun Yi

AU - Hsu, Hsu-Cheng

AU - Cheng, Hsin Min

AU - Yang, Song

AU - Hsieh, Wen Feng

PY - 2006/1/18

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AB - The randomly oriented ZnO nanosaws were synthesized on Si substrates by a simple vapor transport method. For structure characterization of the products, the SEM micrograph clearly reveals that length of nanosaw exceeds several tens of μm and the side of sharp teeth of a saw has a length of about 1-5 μm and diameters of about 100 nm. The results of TEM, XRD, and Raman measurements indicate that the ZnO nanosaw is the single-crystal structure with the wurtzite phase. Under low excitation density, this UV emission peak measured at room temperature is attributed to the recombination of free excitons. Several sharp peaks emerge at photon energy around 3.18 eV with FWHM less than 4 meV when the sample is excited above a certain threshold. We refer that the random lasing in ZnO nanosaws results from the multiple coherent scattering in highly random-oriented ZnO nanosaws.

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