Enhancement of the near-band-edge photoluminescence of ZnO nanowires: Important role of hydrogen incorporation versus plasmon resonances

Dev, Apurba; Richters, Jan‐Peter; Sartor, Janos; Kalt, H.; Gutowski, J.; Voss, T.

doi:10.1063/1.3569951

Cited by 43 publications

(31 citation statements)

References 16 publications

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“…However, their d‐shells may be not completely filled, giving them a variety of unique properties that make them potentially of great use in electronic devices. These unique properties include wide bandgaps,3, 4 high dielectric constants,5–7 reactive electronic transitions,8, 9 and good electrical,10, 11 optical,12, 13 and electrochromic characteristics,14, 15 as well as superconductivity 16, 17. Therefore, metal‐oxides are considered to be some of the most fascinating functional materials and have been widely exploited in various technological applications.…”

Section: Introductionmentioning

confidence: 99%

One‐Dimensional Metal‐Oxide Nanostructures: Recent Developments in Synthesis, Characterization, and Applications

Devan

Patil

Lin

et al. 2012

Adv Funct Materials

730

396

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1D metal-oxide nanostructures have attracted much attention because metal oxides are the most fascinating functional materials. The 1D morphologies can easily enhance the unique properties of the metal-oxide nanostructures, which make them suitable for a wide variety of applications, including gas sensors, electrochromic devices, light-emitting diodes, fi eld emitters, supercapacitors, nanoelectronics, and nanogenerators. Therefore, much effort has been made to synthesize and characterize 1D metal-oxide nanostructures in the forms of nanorods, nanowires, nanotubes, nanobelts, etc. Various physical and chemical deposition techniques and growth mechanisms are exploited and developed to control the morphology, identical shape, uniform size, perfect crystalline structure, defects, and homogenous stoichiometry of the 1D metal-oxide nanostructures. Here a comprehensive review of recent developments in novel synthesis, exceptional characteristics, and prominent applications of one-dimensional nanostructures of tungsten oxides, molybdenum oxides, tantalum oxides, vanadium oxides, niobium oxides, titanium oxides, nickel oxides, zinc oxides, bismuth oxides, and tin oxides is provided. FEATURE ARTICLEpoint lower but the resistivity higher, so the thermal and chemical stability of the 1D metal-oxide nanostructures may be weakened. In other words, overheating caused by the passage of high currents through the nanodevices or nanoelectronics can easily burn the 1D metal-oxide nanostructures causing them to break. Ideally the 1D metal-oxide nanostructures used for the nanodevices or nanoelectronics are expected to be identical in shape, uniform in size, perfect in crystalline structure, and easy in taking apart, and have no morphological defects and a consistent chemical composition. However, control of the morphology, shape, size, crystalline structure, and chemical composition of the 1D metal-oxide nanostructures remains a challenge in the development of 1D controllable synthesis methods.A number of physical and chemical methods have been use to achieve the goals of identical shape, uniform size, perfect crystals, no defects, and homogenous stoichiometry in the synthesis of ideal 1D metal-oxide nanostructures. In Section 2, we introduce some of the synthesis techniques for the production of various 1D metal-oxide nanostructures, covering the theoretical and experimental aspects of recent developments, such as 1D nanostructure design, processing, modeling, and fabrication. In Section 3, we present several growth mechanisms for the growth of 1D metal-oxide nanostructures. Since such 1D nanostructures possess a highly anisotropic morphology, they preferentially grow along one particular crystalline direction to form the 1D morphology. This anisotropic growth is strongly dominated by internal and external stresses, such as easy-growth lattice-planes and template confi nement, respectively. In Section 4, we provide a comprehensive review of a variety of 1D metal-oxide nanostructures, including tungsten oxides, molybdenum oxides, ta...

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Section: Introductionmentioning

confidence: 99%

One‐Dimensional Metal‐Oxide Nanostructures: Recent Developments in Synthesis, Characterization, and Applications

Devan

Patil

Lin

et al. 2012

Adv Funct Materials

730

396

View full text Add to dashboard Cite

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“…ZnO, Cu 2 O, NiO, V 2 O 5 , Fe 2 O 3 , and TiO 2 ) having unique properties such as photoconduction, catalytic activity, a wide bandgap, and a high dielectric constant. [14][15][16] Nevertheless, controlling the anisotropic growth of metal oxides and manipulating a target 1D structure remain major challenges. One method for resolving difficulties in the synthetic process and taking advantage of metal oxides is to incorporate metal oxides into nonmetaltemplate materials such as a carbon substrate or SiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a silica/titania hollow nanorod and its electroresponsive activity

et al. 2017

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In this study, a 1D oriented hollow SiO 2 /TiO 2 (HST) rod-like material was successfully fabricated via a sequential combination of sol-gel use, TiO 2 incorporation, and a sonication-mediated etching and redeposition method. This carefully manipulated new material has numerous advantageous physical and intrinsic properties, such as increased surface area, pore volume, interfacial polarization, and dielectric properties introduced from each synthetic step. The synthesized HST rod was adopted as an electrorheological (ER) material for practical examination of these characteristics. The HST rod materials exhibited 1.5-and 3-fold higher ER performance than a non-metal SiO 2 rod and a non-hollow SiO 2 /TiO 2 core/shell (ST/CS) rod, which are interim synthetic steps. Moreover, the HST rod exhibited remarkable 6-fold increased ER efficiency relative to a sphere-shaped hollow SiO 2 /TiO 2 particle synthesized using a similar experimental method. These notable enhancements in ER performance are attributed to incorporation of the experimentally designed characteristics of the HST rod: 1D structure, metal oxide incorporation, and creation of a hollow cavity. For future study, we expect that these versatile HST rod materials can be applied in a range of fields including drug delivery, photo-catalysis, and as building blocks.SiO 2 rod, ST/CS rod, and HST rod (L/D ¼ 3), (2) TEM micrographs HCl untreated and calcined SiO 2 rod and resulting HST rod, (3) TEM micrographs of shell thickness controlled HST rod, (4) TEM micrographs of SiO 2 rod, ST/CS rod, and HST materials with varying aspect ratio (L/D ¼ 1, 2, 6), (5) low-magnied TEM micrographs of various HST materials (L/D ¼ 1, 2, 6), (6) physical parameters of various HST materials, (7) porosity, pore volume, and BET surface area of HST rod (L/D ¼ 3), (8) EDS analysis of SiO 2 rod, ST/CS rod, and HST rod (L/D ¼ 3), (9) STEM elemental mapping of SiO 2 rod (L/D ¼ 3), (10) FT-IR spectra and XRD pattern of SiO 2 rod, ST/CS rod, and HST rod (L/D ¼ 3), (11) FT-IR spectra of HCl treated and untreated SiO 2 rod, (12) atomic compositions of various HST materials (L/D ¼ 1, 2, 6), (13) shear stress of HST material-based ER uids with varying aspect ratio (L/D ¼ 1, 2, 6), (14) dielectric properties of HST sphere. See

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“…5 The ZnO nanostructure is an important semiconductor with a direct bandgap of 3.34 eV, and the primary motivator of ZnO research is its great potential for a variety of practical applications, such as in LEDs, 6 solar cells, 7 nanogenerators, 8 transistors, 9 sensors, 10 catalysts, 11 etc. In many literature studies, a variety of strategies, such as doping, 14,15 thermal annealing, [16][17][18] plasma treatment, 19,20 and constructing heteronanostructures, 21,22 have been developed. For example, visible-light-driven photocatalytic properties have been observed in ZnO/ZnFe 2 O 4 core/shell nanocable arrays.…”

Section: Introductionmentioning

confidence: 99%

Novel photoluminescence properties and enhanced photocatalytic activities for V₂O₅-loaded ZnO nanorods

Yin

et al. 2015

Dalton Trans.

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Three different kinds of V2O5/ZnO heteronanorods were synthesized through a CVD process and oxidized in air at temperatures of 350, 420 and 500 °C. These 1D heteronanorods were formed from ZnO nanorods (NRs) coated with V2O5 nanoparticles (NPs). With the rise of oxidation temperature, the coated V2O5 NPs were found to be growing and their crystallinity gradually improved. Photoluminescence (PL) spectra for these V2O5/ZnO samples exhibited some novel characteristics, such as the appearance of new emission peaks, the variation in PL intensity, and the tremendously enhanced visible emission for the 500 °C sample. Photocatalysis investigation for all V2O5/ZnO samples showed enhanced photocatalytic activities compared to their single-component counterparts. Furthermore, their photocatalytic activities were also influenced by the oxidation temperature. The 350 °C sample showed the highest photocatalytic activity, and gradually decreased photocatalytic activities were observed for the other two samples. The novel PL properties and enhanced photocatalytic activities were attributed to the coupling between ZnO NRs and V2O5 NPs, and can be attributed to the collective effect of the V-doped ZnO layer near the interface, the decreased defect concentration in V2O5 NPs, and the improved particle crystallinity.

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Enhancement of the near-band-edge photoluminescence of ZnO nanowires: Important role of hydrogen incorporation versus plasmon resonances

Cited by 43 publications

References 16 publications

One‐Dimensional Metal‐Oxide Nanostructures: Recent Developments in Synthesis, Characterization, and Applications

One‐Dimensional Metal‐Oxide Nanostructures: Recent Developments in Synthesis, Characterization, and Applications

Fabrication of a silica/titania hollow nanorod and its electroresponsive activity

Novel photoluminescence properties and enhanced photocatalytic activities for V₂O₅-loaded ZnO nanorods

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Enhancement of the near-band-edge photoluminescence of ZnO nanowires: Important role of hydrogen incorporation versus plasmon resonances

Cited by 43 publications

References 16 publications

One‐Dimensional Metal‐Oxide Nanostructures: Recent Developments in Synthesis, Characterization, and Applications

One‐Dimensional Metal‐Oxide Nanostructures: Recent Developments in Synthesis, Characterization, and Applications

Fabrication of a silica/titania hollow nanorod and its electroresponsive activity

Novel photoluminescence properties and enhanced photocatalytic activities for V2O5-loaded ZnO nanorods

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Product

Resources

About

Novel photoluminescence properties and enhanced photocatalytic activities for V₂O₅-loaded ZnO nanorods