The structural and optical properties of a single ZnO comb and an individual nail-like tooth

Huang, Xing; Xia, Jing; Luan, Chunyan; Sun, Mingliang; Wang, Xuecong; She, Guangwei; Lee, Chun‐Sing; Meng, Xiang‐Min

doi:10.1039/c3ce41424h

Cited by 6 publications

(4 citation statements)

References 42 publications

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“…During the past two decades, one dimensional (1D) semiconductor nanomaterials, including nanorods, 1 nanowires, 2 nanobelts, 3 nanotubes, 4 and so forth, have aroused considerable research interest due to their unique geometry shape with a high surface-to-volume ratio and exceptional physicochemical properties. [5][6][7] Among these nanostructures, 1D ZnO nanomaterials, [8][9][10] especially ZnO nanotubes, have attracted particular attention because of their excellent photonic and electric properties. [11][12][13][14][15][16][17] The high porosity and large surface area of ZnO nanotubes can largely satisfy the need for high efficiency and activity in numerous applications, such as, bio-/gas sensors, 18 solar cells 19 and photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Three dimensional ZnO nanotube arrays and their optical tuning through formation of type-II heterostructures

et al. 2016

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In this paper, we report on the first successful attempt of chemical vapor deposition (CVD) synthesis of well-aligned single-crystalline ZnO nanotube arrays on Mo wire mesh. According to detailed morphology and composition analyses, a rational growth model is proposed to illustrate the growth process of the hollow ZnO nanotubes. Metastable Zn-rich ZnO_x nanorods formed in the early stage are believed to play a vital role towards the formation of nanotube configuration. In addition, we also successfully fabricate ZnO/ ZnS and ZnO/CdS core/shell nanotube arrays by simply depositing ZnS and CdS on the pre-fabricated ZnO nanotubes. Despite the existence of a large lattice mismatch, the grown ZnS and CdS layers are somewhat single-crystalline and show an epitaxial orientation relationship with the inner ZnO, that is, [0001]_{ZnS or CdS}//[0001]_ZnO and (10-10)_{ZnS or CdS}//(10-10)_ZnO. Further, room temperature cathodoluminescence (CL) characterization indicates that after surface decoration, the formed ZnO-based heterostructures show dis- tinguished optical properties. Quenching of 67.2% and 99.7% of ZnO near-band-gap (NBE) emission is ob- served on ZnO/CdS and ZnO/ZnS, respectively. Efficient charge separation resulting from type-II band con- figuration is considered to be responsible for the variation of optical properties. Our method may represent a powerful synthesis platform for creation of ZnO nanotubes and ZnO-based hollow heterostructures with tunable properties

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Section: Introductionmentioning

confidence: 99%

Three dimensional ZnO nanotube arrays and their optical tuning through formation of type-II heterostructures

et al. 2016

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“…Micro/nanoscale branched comb-like semiconductor structures have stimulated intensive interest due to their novel properties and potential applications on nanoscale optical and optoelectronic devices [1][2][3][4], which extends their structural dimensionality and complexity greatly, providing more functions [5]. In particular, orderly branched nanostructures, such as natural nanowire arrays, will promote the realization of array devices due to their superior array characteristics [6].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent raman and photoluminescence of an individual Sn-doped CdS branched nanostructure

et al. 2015

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Temperature dependent Raman spectra and photoluminescence, as well the Raman mapping of different parts in an individual Sn-doped CdS comb-like nanostructure reveal that the stronger electron-phonon coupling exist at the trunk-branch junctions than other parts. The Huang-Rhys factor was calculated and further confirms that the strong electron-phonon correlation at the junction. The localized deformation from the Sn dopant in the lattice leads to strong electron-phonon coupling at the local junction, which is proved by the scanning transmission electron microscope and energy dispersion spectrum. Moreover, the lifetime of near-band-edge emission and deep-level emission drastically increase with decreasing temperature, which both relate to the localized electronphonon coupling and relaxation process. This work provides a clear description of the localized carrier correlation in the cross junction part of these branched nanostructures, which can be used to modulate the optoelectronic performance of micro/nanodevices.

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“…These particular behaviors require growing ZnO nanostructures with controllable and tunable morphologies, sizes and crystallinity which have direct effects on carrier transport and photon trapping and scattering . Various ZnO nanostructures have thus far been developed, including particles, rods, wires, belts, tubes, rings, sheets, combs, nails, tetrapods, branched structures and hierarchical structures …”

Section: Controllable Synthesis and Post‐treatments Of Zno Nanostructmentioning

confidence: 99%

Surface Engineering of ZnO Nanostructures for Semiconductor‐Sensitized Solar Cells

et al. 2014

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Semiconductor-sensitized solar cells (SSCs) are emerging as promising devices for achieving efficient and low-cost solar-energy conversion. The recent progress in the development of ZnO-nanostructure-based SSCs is reviewed here, and the key issues for their efficiency improvement, such as enhancing light harvesting and increasing carrier generation, separation, and collection, are highlighted from aspects of surface-engineering techniques. The impact of other factors such as electrolyte and counter electrodes on the photovoltaic performance is also addressed. The current challenges and perspectives for the further advance of ZnO-based SSCs are discussed.

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The structural and optical properties of a single ZnO comb and an individual nail-like tooth

Cited by 6 publications

References 42 publications

Three dimensional ZnO nanotube arrays and their optical tuning through formation of type-II heterostructures

Three dimensional ZnO nanotube arrays and their optical tuning through formation of type-II heterostructures

Temperature dependent raman and photoluminescence of an individual Sn-doped CdS branched nanostructure

Surface Engineering of ZnO Nanostructures for Semiconductor‐Sensitized Solar Cells

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