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Self-Etching-Induced Morphological Evolution of ZnO Microrods Grown on FTO Glass by Hydrothermal Method.

Hsu WD, Tsai JK, Meen TH, Wu TC, He YK, Lai YD - Nanoscale Res Lett (2015)

Bottom Line: The results confirm that the morphology change at the top end is due to self-etching.A satellite peak in the UV emission spectra was observed.The peak may be attributed to the morphology effect of the microrods.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 70101, Taiwan. wendung@mail.ncku.edu.tw.

ABSTRACT
In this research, the zinc oxide (ZnO) microrods were grown by hydrothermal method on fluorine-doped tin oxide (FTO) glass functionalized by self-assembled monolayer of octadecyltrimethoxysilane (ODS; CH3(CH2)17Si(OCH3)3). The sharp-tip or polygonal shape with specific facets at the top end of ZnO microrods can be obtained by post retention at low temperature. The morphologies were characterized by the field-emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM). The results confirm that the morphology change at the top end is due to self-etching. The mechanism responsible for the formation of various top-end morphologies was proposed. The specific facets that left after 6-h retention were identified. The room-temperature micro-photoluminescence spectra showed a strong ultraviolet emission at 387 nm, and a broad emission at a range of from 500 to 700 nm. The morphology change also influences the photoluminescence (PL) spectra. A satellite peak in the UV emission spectra was observed. The peak may be attributed to the morphology effect of the microrods.

No MeSH data available.


XRD patterns of ZnO microrods synthesized on FTO glass with a retention time from 0 to 6 h
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Fig2: XRD patterns of ZnO microrods synthesized on FTO glass with a retention time from 0 to 6 h

Mentions: Figure 2 shows XRD patterns of all the samples after retention from 0 to 6 h. The three main diffraction peaks at 2θ = 31.79°, 34.50°, and 36.29° come from the (10–10), (0002), and (10–11) diffraction pattern of hexagonal wurtzite structure, respectively. They match well with the JCPDS card of no. 36-1451 with lattice constants of a = 3.25 and c = 5.21 Å. The diffraction peaks of FTO glass also can be observed indicating low area density ZnO microrods were grown on functionalized FTO glass because no seed layer was used. The intensity ratio of (0002) to (10–11) peaks is strong for the sample without retention. While the retention time increases, the ratio decreases.Fig. 2


Self-Etching-Induced Morphological Evolution of ZnO Microrods Grown on FTO Glass by Hydrothermal Method.

Hsu WD, Tsai JK, Meen TH, Wu TC, He YK, Lai YD - Nanoscale Res Lett (2015)

XRD patterns of ZnO microrods synthesized on FTO glass with a retention time from 0 to 6 h
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4628042&req=5

Fig2: XRD patterns of ZnO microrods synthesized on FTO glass with a retention time from 0 to 6 h
Mentions: Figure 2 shows XRD patterns of all the samples after retention from 0 to 6 h. The three main diffraction peaks at 2θ = 31.79°, 34.50°, and 36.29° come from the (10–10), (0002), and (10–11) diffraction pattern of hexagonal wurtzite structure, respectively. They match well with the JCPDS card of no. 36-1451 with lattice constants of a = 3.25 and c = 5.21 Å. The diffraction peaks of FTO glass also can be observed indicating low area density ZnO microrods were grown on functionalized FTO glass because no seed layer was used. The intensity ratio of (0002) to (10–11) peaks is strong for the sample without retention. While the retention time increases, the ratio decreases.Fig. 2

Bottom Line: The results confirm that the morphology change at the top end is due to self-etching.A satellite peak in the UV emission spectra was observed.The peak may be attributed to the morphology effect of the microrods.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 70101, Taiwan. wendung@mail.ncku.edu.tw.

ABSTRACT
In this research, the zinc oxide (ZnO) microrods were grown by hydrothermal method on fluorine-doped tin oxide (FTO) glass functionalized by self-assembled monolayer of octadecyltrimethoxysilane (ODS; CH3(CH2)17Si(OCH3)3). The sharp-tip or polygonal shape with specific facets at the top end of ZnO microrods can be obtained by post retention at low temperature. The morphologies were characterized by the field-emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM). The results confirm that the morphology change at the top end is due to self-etching. The mechanism responsible for the formation of various top-end morphologies was proposed. The specific facets that left after 6-h retention were identified. The room-temperature micro-photoluminescence spectra showed a strong ultraviolet emission at 387 nm, and a broad emission at a range of from 500 to 700 nm. The morphology change also influences the photoluminescence (PL) spectra. A satellite peak in the UV emission spectra was observed. The peak may be attributed to the morphology effect of the microrods.

No MeSH data available.