The preparation and property control of Zinc Oxide NPs

Yusuke Sakai, Chan Gi Lee, Masato Uehara, Hiroyuki Nakamura, Hideaki Maeda

Research output: Contribution to journalConference article

Abstract

ZnO nanoparticles (NPs) have attracted increasing attention recently because it is nontoxic, chemically stable towards air, and inexpensive luminescent material instead of the GaN- based structures. However, in general, two emission peaks appear in the ultraviolet and visible region in the photoluminescence spectra of ZnO NPs because of trapping with surface states or a lattice defect. Therefore, in this study, we tried to control the defect of ZnO NPs to obtain pure band-edge emission peak, as well as to keep the dispersivity as colloidal solution. At first, we applied high temperature (300°C) to synthesize ZnO NPs, however, short reaction time (<30s) was not enough for obtaining pure-band-edge emission ZnO NPs, whereas long time (>120s) reaction made ZnO NPs to lose its colloidal stability and aggregated to decrease their PL intensity significantly. So, low synthesis temperature (200°C) was hardly obtaining emission peak even after 1h of heating. Therefore, it was tried to divide synthesis into two steps to generate ZnO NPs at high temperature (300°C) and to heal the defect with the dispersing quality keeping at low temperature (200°C). As a result, we succeed to suppress the defects of ZnO NPs and obtain the well-dispersed pure band-edge emission ZnO NPs.

Original languageEnglish
Article number082026
JournalIOP Conference Series: Materials Science and Engineering
Volume18
Issue numberSYMPOSIUM 5
DOIs
Publication statusPublished - Jan 1 2011
Event3rd International Congress on Ceramics, ICC 2011 - Osaka, Japan
Duration: Nov 14 2010Nov 18 2010

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Zinc Oxide
Zinc oxide
Nanoparticles
Defects
Temperature
Crystal defects
Surface states
Photoluminescence
Heating

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

Cite this

The preparation and property control of Zinc Oxide NPs. / Sakai, Yusuke; Lee, Chan Gi; Uehara, Masato; Nakamura, Hiroyuki; Maeda, Hideaki.

In: IOP Conference Series: Materials Science and Engineering, Vol. 18, No. SYMPOSIUM 5, 082026, 01.01.2011.

Research output: Contribution to journalConference article

Sakai, Yusuke ; Lee, Chan Gi ; Uehara, Masato ; Nakamura, Hiroyuki ; Maeda, Hideaki. / The preparation and property control of Zinc Oxide NPs. In: IOP Conference Series: Materials Science and Engineering. 2011 ; Vol. 18, No. SYMPOSIUM 5.
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