Synthesis and photoluminescence of ultra-thin ZnO nanowire/nanotube arrays formed by hydrothermal growth

Sun, Ye; Ndifor-Angwafor, Nche George; Riley, D. Jason; Ashfold, Michael N. R.

doi:10.1016/j.cplett.2006.09.100

Cited by 238 publications

(120 citation statements)

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“…59 It is generally accepted that annealing in argon facilitates the removal of chemisorbed oxygen or other oxygen-containing species (e.g., OH − ) from the ZnO surface, reducing the defect concentration and the charge depletion region and thus enhancing the UV emission. 60 The decrease of the yellow and orange emission intensities with the annealing process is also consistent with the reduction of the defect concentration. In particular, the defects at the origin of these emissions are clearly eliminated with the annealing treatment.…”

Section: 49−52supporting

confidence: 66%

Visible Photoluminescence Components of Solution-Grown ZnO Nanowires: Influence of the Surface Depletion Layer

et al. 2012

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Arrays of electrodeposited ZnO nanowires (NWs) were used to illustrate the dependence of the ZnO visible photoluminescence (PL) emission on the extension of the surface depletion layer and obtain further insight into the localization of the related states. With this goal in mind, three sets of measurements were carried out: (i) analysis of the PL spectra of ZnO:Cl NWs as a function of their carrier concentration; (ii) analysis of the PL spectra of ZnO:Cl/ZnO core−shell NWs as a function of the thickness of their intrinsic ZnO shell; (iii) in situ analysis of the PL dependence on the polarization of ZnO:Cl photoelectrodes. The obtained experimental results evidenced that the yellow and orange emissions from electrodeposited ZnO NWs are correlated with the extension of the NWs surface depletion region. This result points out the surface localization of the states at the origin of these transitions. On the other hand, the green emission that dominates the visible part of the PL spectra in annealed ZnO NWs showed no dependence on the surface band bending, thus pointing toward its origin in the bulk.

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Section: 49−52supporting

confidence: 66%

Visible Photoluminescence Components of Solution-Grown ZnO Nanowires: Influence of the Surface Depletion Layer

et al. 2012

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“…48,49 The UV emission from the bare ZnO NRs grown in the present work is already rather strong, and the maximum UV emission enhancement achieved using either of 4 | J. Name., 2012, 00, 1-3 This journal is © The Royal Society of Chemistry 2012…”

Section: Resultsmentioning

confidence: 63%

“…Emission centred at ~520 nm within the latter is usually assigned to defects of oxygen vacancies, while the longer wavelength emission (maximising in the 570-610 nm range) is traditionally associated with defects based on oxygen interstitials. 48 The intensity of the former (blue) emission, in contrast, is seen to increase with the amount of TEOS used in the silica-coating process (Figure 3), and is thus attributed to the amorphous silica shells (see Figure S6). Figure 6 shows how the PL emission from ZnO ND/SiO 2 NR samples is affected by annealing in an O 2 atmosphere.…”

Section: Resultsmentioning

confidence: 99%

Arrays of nanorods composed of ZnO nanodots exhibiting enhanced UV emission and stability

Yin

Sun

et al. 2014

Nanoscale

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“…The UV emission is generally considered to emanate from the inner part of the NRs, beneath the depletion layer. 25,59 I UV will therefore be sensitively dependent on any expansion or reduction of the depletion layer. Previous Apart from enhancing the UV emission of CuO-ZnO, Cu-doped ZnO and pure ZnO NRs (to differing extents), H 2 S adsorption can also influence I vis .…”

Section: H 2 S Sensing Mechanisms Of Cuo-zno Nrsmentioning

confidence: 99%

Sensitive Room Temperature Photoluminescence-Based Sensing of H₂S with Novel CuO–ZnO Nanorods

Liu

Sun

et al. 2016

ACS Appl. Mater. Interfaces

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. ABSTRACTNovel CuO nanoparticle-capped ZnO nanorods have been produced using a pulsed laser deposition (PLD) method. These nanorods are shown to grow by a CuO-nanoparticle-assisted vapour-solid-solid (V-S-S) mechanism. The photoluminescence (PL) accompanying ultraviolet illumination of these capped nanorod samples shows large variations upon exposure to trace quantities of H 2 S gas. The present data suggests that both the Cu-doped ZnO stem and the CuO capping nanoparticle contribute to optical H 2 S sensing with these CuO-ZnO nanorods. This study represents the first demonstration of PL-based H 2 S gas sensing, at room temperature, with sub-ppm sensitivity. It also opens the way to producing CuO-ZnO nanorods by a V-S-S mechanism using gas phase methods other than PLD.2

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Synthesis and photoluminescence of ultra-thin ZnO nanowire/nanotube arrays formed by hydrothermal growth

Cited by 238 publications

References 29 publications

Visible Photoluminescence Components of Solution-Grown ZnO Nanowires: Influence of the Surface Depletion Layer

Visible Photoluminescence Components of Solution-Grown ZnO Nanowires: Influence of the Surface Depletion Layer

Arrays of nanorods composed of ZnO nanodots exhibiting enhanced UV emission and stability

Sensitive Room Temperature Photoluminescence-Based Sensing of H₂S with Novel CuO–ZnO Nanorods

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Synthesis and photoluminescence of ultra-thin ZnO nanowire/nanotube arrays formed by hydrothermal growth

Cited by 238 publications

References 29 publications

Visible Photoluminescence Components of Solution-Grown ZnO Nanowires: Influence of the Surface Depletion Layer

Visible Photoluminescence Components of Solution-Grown ZnO Nanowires: Influence of the Surface Depletion Layer

Arrays of nanorods composed of ZnO nanodots exhibiting enhanced UV emission and stability

Sensitive Room Temperature Photoluminescence-Based Sensing of H2S with Novel CuO–ZnO Nanorods

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Sensitive Room Temperature Photoluminescence-Based Sensing of H₂S with Novel CuO–ZnO Nanorods