ZnO microspheres: Controllable preparation and optical properties

Wang, Yongqian; Yang, Jun; Kong, Jinming; Jia, Hanxiang; Yu, Meihua

doi:10.1016/j.spmi.2015.07.055

Cited by 15 publications

(8 citation statements)

References 21 publications

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“…ZnO has also attracted attention for its low cost, ease of preparation, very good chemical stability, suitability to doping, non-toxicity, and ease of processing, for example in the form of thin films [ 84 , 128 ]. This is a material that can be easily synthesized in various types of nanostructures, such as nanorods ( Figure 2 a) [ 122 ], nanosheets ( Figure 2 b) [ 132 ], nanotubes ( Figure 2 c) [ 133 ], nanoflowers ( Figure 2 d) [ 1 ], microspheres ( Figure 2 e) [ 134 ], nanoplates ( Figure 2 f) [ 113 ], nanoflakes ( Figure 2 g) [ 135 ], nanowires ( Figure 2 h) [ 136 ], and nanofibers ( Figure 2 i) [ 137 ]. These types of microstructures ensure a large specific surface area and allow the penetration of gas molecules into the volume of the material, which is a great advantage for RT detection with SAW sensors [ 128 , 138 , 139 , 140 , 141 ].…”

Section: Zno In Saw Sensorsmentioning

confidence: 99%

“… Scanning Electron Microscope (SEM) images for different types of morphologies obtained for ZnO: nanorods ( a ) [ 122 ], nanosheets ( b ) [ 132 ], nanotubes ( c ) [ 133 ], nanoflowers ( d ) [ 1 ], microspheres ( e ) [ 134 ], nanoplates ( f ) [ 113 ], nanoflakes ( g ) [ 135 ], nanowires ( h ) [ 136 ], and nanofibers ( i ) [ 137 ]. Reproduced (2020) with permission from Elsevier and ACS Publications.…”

Section: Figurementioning

confidence: 99%

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ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Constantinoiu

Viespe

2020

Sensors

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Surface acoustic wave (SAW) gas sensors are of continuous development interest to researchers due to their sensitivity, short detection time, and reliability. Among the most used materials to achieve the sensitive film of SAW sensors are metal oxide semiconductors, which are highlighted by thermal and chemical stability, by the presence on their surface of free electrons and also by the possibility of being used in different morphologies. For different types of gases, certain metal oxide semiconductors are used, and ZnO is an important representative for this category of materials in the field of sensors. Having a great potential for the development of SAW sensors, the discussion related to the development of the sensitivity of metal oxide semiconductors, especially ZnO, by the synthesis method or by obtaining new materials, is suitable and necessary to have an overview of the latest results in this domain.

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Section: Zno In Saw Sensorsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Constantinoiu

Viespe

2020

Sensors

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“…Besides, ZnO films are considered high transparency materials ranging from infrared (IR) to visible regions with significant refractive constants. As a result, all those characteristic behaviors are potentially broadening the ZnO technological applications, such as in UV-light emitters, solar cell windows, thin-film transistors, biological and chemical gas sensors, and biomedical sensors varistors [7]. Among these properties, the extremely photocatalytic characteristic with ultraviolet (UV) light, ZnO displayed excellent potentials for photocatalyst applications in wastewater treatments [8,9].…”

Section: Introductionmentioning

confidence: 99%

Structural, Morphological and Optical Bandgap Analysis of Multifunction Applications of Y2O3 -ZnO Nanocomposites : Varistors and Visible Photocatalytic Degradations of Wastewater

AlAbdulaal

AlShadidi

Hussien

et al. 2021

Preprint

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In this study, a combustion method as an efficient, easy, low-cost, and eco-friendly technique was used to synthesize nano-ZnO as a matrix with different yttrium doping ratios with different doping concentrations. Not only X-ray diffraction (XRD), but also scanning electron microscopy (SEM), and Fourier transformation Infrared spectroscopy (FT-IR) technique employed to characterize the structural and surface morphology of the Y2O3-ZnO nanocomposites. The obtained results supported ZnO's growth from crystalline to satisfactory nanoparticle structure by changing the yttrium doping concentrations inside ZnO nanoparticles. Moreover, UV-Vis diffuse reflectance spectroscopy, AC electrical conductivity, and current-voltage characteristics were considered to characterize the effects of yttrium doping on the energy bandgaps and electrical/dielectric properties and discussed the parameters of the ceramic varistors of the studied Y2O3-ZnO nano-complex oxides. The photocatalytic degradation efficiency of phenol, Methylene Blue, and Rhodamine B was investigated using all prepared Y2O3-ZnO nanostructured samples. As the yttrium doping ratios increased, the photocatalytic efficiency increased. After the addition of moderate Y3+ ions-doping, Further generation of hydroxyl radicals over ZnO. For Y2O3-ZnO (S5), the optimal photocatalyst is a degradation of 100 % of phenol, Methylene Blue, and Rhodamine B solutions compared to 80% of photocatalysis for ZnO stand alone. The prepared Y2O3-ZnO nanostructured materials are considered novel potential candidates in broad nano-applications ranging from biomedical and photocatalytic degradation for organic dyes and phenol to environmental and varistor applications.

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“…Various synthetic approaches using different chemical and physical methods [15], such as electro-deposition [16][17][18], sol-gel [19], and hydrothermal [14,20,21] have been employed to fabricate several types of ZnO nano-and microstructures including nanorods [16,22,23], nanowires [20,24], and micro- [14,21,25] and nano-spheres [26]. Nevertheless, the fabrication of well-defined micrometer-sized particles is still challenging.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the fabrication of well-defined micrometer-sized particles is still challenging. Among all the aforementioned studies, only two studies [21,25] are related to the synthesis of ZnO microparticles, which suffer from a poor control of the particle sizes and a narrow particle size distribution, because of the use of a standard hydrothermal condensation procedure. The fabrication of ZnO microspheres and microcapsules with a highly monodisperse and controlled size in the micrometer range (and above) is highly desirable for many applications such as a highly sensitive optical biosensing based on whispering gallery mode (WGM) detection [27].…”

Section: Introductionmentioning

confidence: 99%

Rhodamine B Doped ZnO Monodisperse Microcapsules: Droplet-Based Synthesis, Dynamics and Self-Organization of ZnO Nanoparticles and Dye Molecules

et al. 2020

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In the present work, droplet-based microfluidics and sol-gel techniques were combined to synthesize highly monodisperse zinc oxide (ZnO) microspheres, which can be doped easily and precisely with dyes, such as rhodamine B (RhB), and whose size can be finely tuned in the 10–30 μm range. The as-synthesized microparticles were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and confocal microscopy. The results reveal that the microspheres exhibit an excellent size monodispersity, hollow feature, and a porous shell with a thickness of about 0.6 μm, in good agreement with our calculations. We show in particular by means of fluorescence recovery after photobleaching (FRAP) analysis that the electric charges carried by ZnO nanoparticles primary units play a crucial role not just in the formation and structure of the synthesized ZnO microcapsules, but also in the confinement of dye molecules inside the microcapsules despite a demonstrated porosity of their shell in regards to the solvent (oil). Our results enable also the measurement of the diffusion coefficient of RhB molecules inside the microcapsules (DRhB=3.8×10−8 cm2/s), which is found two order of magnitude smaller than the literature value. We attribute such feature to a strong interaction between dye molecules and the electrical charges carried by ZnO nanoparticles. These results are important for potential applications in micro-thermometry (as shown recently in our previous study), photovoltaics, or photonics such as whispering gallery mode resonances.

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ZnO microspheres: Controllable preparation and optical properties

Cited by 15 publications

References 21 publications

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Structural, Morphological and Optical Bandgap Analysis of Multifunction Applications of Y2O3 -ZnO Nanocomposites : Varistors and Visible Photocatalytic Degradations of Wastewater

Rhodamine B Doped ZnO Monodisperse Microcapsules: Droplet-Based Synthesis, Dynamics and Self-Organization of ZnO Nanoparticles and Dye Molecules

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