Photoluminescent and Structural Properties of Precipitated ZnO Fine Particles

Gomi, Manabu; Oohira, Naoko; Ozaki, Kenichi; Koyano, Mikio

doi:10.1143/jjap.42.481

Cited by 180 publications

(96 citation statements)

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“…Origin of this emission is unknown. It is down-shifted in energy, as compared to the spectral positions of the green and yellow ZnO PL bands, but peaks at the higher energy than the red ZnO emission, observed typically at 1.9-2.0 eV, as reported by Nanto et al [11] and Gomi et al [12]. Moreover, the yellow and the red PL emissions are usually deactivated at increased temperatures and are replaced by the green ZnO PL band [4], whereas the 580-610 nm PL emission remains strong at the room temperature.…”

Section: Optical Properties Of Nanoparticlessupporting

confidence: 50%

Growth and Characterization of ZnO Nanoparticles

et al. 2005

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In this work we evaluate structural and optical properties of ZnO nanoparticles grown by wet chemistry method. Light emission properties of these nanoparticles are studied with cathodoluminescence and microphotoluminescence. Even at the room temperature excitonic emission is well resolved, due to high exciton binding energy of ZnO. Decay kinetics of photoluminescence emissions and efficiency of inter-nanoparticles energy migration is evaluated from maps of in-plane variations of photoluminescence decay times measured in microphotoluminescence setup.

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Section: Optical Properties Of Nanoparticlessupporting

confidence: 50%

Growth and Characterization of ZnO Nanoparticles

et al. 2005

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“…The UV spectrum is associated with near band-edge transition in ZnO, namely, the recombination of the free excitons. The visible emission is produced because of the presence of the defect levels in ZnO such as Oxygen and Zinc vacancies (Vo, VZn) [65,66], Oxygen and Zinc interstitial (Oi, Zni) [67,68], Oxygen and Zinc anti-site (OZn and ZnO) [69] as shown in figure 2.3.…”

Section: Zinc Oxide (Zno)mentioning

confidence: 99%

Synthesising Metal Oxide Materials and Their Composite Nanostructures for Sensing and Optoelectronic Device Applications

Khun¹

2015

Linköping Studies in Science and Technology. Dissertations

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Research on nanomaterials has been revolutionized in the last few years because of the attractive properties they have in comparison to the bulk phase of similar materials. These properties are physical, chemical, catalytic and optical. Among these nanomaterials, the metal oxide nanostructures have become of particular interest to scientists for the development of different optical, biochemical and biomedical nanodevices. In the present research work using the advantageous features of nanotechnology, high performance nanodevices for optoelectronics with a wide band gap compound nanostructure and highly sensitive sensor devices have been demonstrated. The nanotechnology is used to fabricate sensitive and precise nanodevices based on nanomaterials for the application of sensing.Among metal oxide nanostructures, ZnO, CuO and NiO are attractive materials because of their unique properties; their high surface area to volume ratio, their energy band gap of 3.37 eV, 1.2 eV and 3.7 eV, respectively, biocompatibility, high electron mobility, fast electron transfer rate and they are environmental-friendly in many applications. When used in sensor devices, nanomaterials have indicated high selectivity for possible use to detect the various analytes even in small volumes. Metal oxide nanostructures have shown to be good for optoelectronic nanodevices because of their electrical characteristics, high optical absorption and low-processing temperature.In this thesis, the synthesis of different morphologies of metal oxide semiconductor nanostructures and their composite using the hydrothermal method are demonstrated for various applications. This thesis is divided into three parts:In the first part of this research work, the fabrication of well-aligned ZnO nanorods using different concentrations of composite seed layer of inorganic and organic materials when using the hydrothermal growth method is presented. The effect of the composite seed layer on the i Abstract alignment, density and optical properties of the grown ZnO nanorods is investigated (paper I).Utilizing the advantage of ZnO nanostructure, a comparative study of ZnO nanorods and thin films for chemical and biosensing application was carried out. The ZnO nanorods and thin films were functionalized with strontium ionophore membrane, immobilized the galactose oxidase and lactate oxidase for determining the strontium ions, D-galactose and L-lactic acid, respectively (paper II).In the second part, the effects of different urea concentrations on the morphology of CuO nanostructures is studied as described in paper III. Moreover, CuO nanoflowers were functionalized with cadmium ion ionophore for the detection of Cd ions, while CuO nanosheets were grown by the low temperature growth method and were used for the development of a nonenzymatic glucose sensor, respectively (Paper IV).In the last part of this thesis, composite nanostructures of CuO/ZnO and NiO/ZnO were applied to develop dopamine sensor and fast sensitive UV photodetector, respectively. A nanohybrid of C...

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“…It is quite obvious that the observed changes are due to complicated defect chemistry relevant to the sonochemical processing. As reported in the literature [1,10,[27][28][29], room-temperature PL of ZnO can exhibit one emission peak in the UV region which is due to the recombination of free excitons, and one or more peaks in the visible region. The latter ones are commonly associated with the defectrelated emissions, such that the defect properties strongly affect optical spectra of ZnO.…”

Section: Pl Spectramentioning

confidence: 59%

Carrier recombination in sonochemically synthesized ZnO powders

Zakirov

Korotchenkov

2017

Materials Science-Poland

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ZnO powders with particle size in the nm to µm range have been fabricated by sonochemical method, utilizing zinc acetate and sodium hydroxide as starting materials. Carrier recombination processes in the powders have been investigated using the photoluminescence, FT-IR and surface photovoltage techniques. It has been shown that the photoluminescence spectra exhibit a number of defect-related emission bands which are typically observed in ZnO lattice and which depend on the sonication time. It has been found that the increase of the stirring time results in a faster decay of the photovoltage transients for times shorter than approximately 5 ms. From the obtained data it has been concluded that the sonication modifies the complicated trapping dynamics from volume to surface defects, whereas the fabrication method itself offers a remarkably convenient means of modifying the relative content of the surface-to-volume defect ratio in powder grains and altering the dynamics of photoexcited carriers.

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Photoluminescent and Structural Properties of Precipitated ZnO Fine Particles

Cited by 180 publications

References 0 publications

Growth and Characterization of ZnO Nanoparticles

Growth and Characterization of ZnO Nanoparticles

Synthesising Metal Oxide Materials and Their Composite Nanostructures for Sensing and Optoelectronic Device Applications

Carrier recombination in sonochemically synthesized ZnO powders

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