Hierarchical porous Ga doped ZnO films synthesized by sol-electrophoretic deposition

Hallajzadeh, Amir Mohammad; Abdizadeh, Hossein; Taheri, Mahtab; Golobostanfard, Mohammad Reza

doi:10.1016/j.ceramint.2020.02.032

Cited by 13 publications

(3 citation statements)

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“…Third, it deals with the anisotropic nature of the crystal by considering the internal energy density in its uniform deformation energy density model (UDEDM), given by equation (14). Furthermore, the size-strain plot (SSP) was also considered for its crucial approach in separating the functions of the strain and size effects into Gaussian and Lorentzian, respectively, as given in equation (15). Using the following equations, the fitted models are shown in figures 5-6 and the obtained values are listed in table 1 [46]:…”

Section: Resultsmentioning

confidence: 99%

“…Among the tremendous efforts that scientists have been exerting to promote the properties of ZnO, doping has been one of the most common approaches. Herein, it is noteworthy to mention that the empty sites occurring at half of the tetrahedral coordination and all of the octahedral coordination of the ZnO wurtzite structure, render ZnO as a suitable host for doping processes [15]. Doping ZnO by cations possessing a higher oxidation state than Zn 2+ ions, with preserving its phase purity, is important; as this supplies extra electrons and enhances the optical and electrical properties of the ZnO nanoparticles [16].…”

Section: Introductionmentioning

confidence: 99%

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Optoelectronic investigations of needle-shaped Zn_1-xSn_xO nanoparticles synthesized by coprecipitation method

2020

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In this work, Zn1-xSnxO (x = 0, 0.01, 0.02, 0.04, 0.06 and 0.1) nanoparticles were synthesized via the coprecipitation method. The prepared nanoparticles were characterized by x-ray powder diffraction (XRD), transmission electron microscope (TEM) and Fourier transform infrared spectroscopy (FTIR). The optical investigations were utilized by UV–vis spectroscopy (UV) and photoluminescence (PL). Moreover, the electrical studies were performed through dc conductivity and dielectric measurements. The successful Sn doping in ZnO nanoparticles induced structural and electronic modifications that triggered oriented growth and gave rise to smaller nanoparticles accompanied by lower lattice distortions and strains. Sn doping had a high impact on the morphology of ZnO nanoparticles, which transformed from nearly non-specified and circular to needle-like shape. Widening of the optical band gap was observed (2.6104 eV for x = 0.00 and 3.0760 eV for x = 0.02) escorted by a decrease in the lattice disorders, as the Urbach energy was reduced (2.8445 eV for x = 0.00 and 0.9980 eV for x = 0.02). Luminescent recombination mechanisms were detected from the UV to the blue region upon excitation by 330 nm. The UV emissions were suppressed whereas the blue emissions were improved due to Sn doping, rendering the prepared nanoparticles beneficial for biological fluorescence labeling applications. The concentration of x = 0.04 showed the minimum UV emissions as well as the minimum blue emissions. Furthermore, the dc conductivity (σdc) was enhanced by Sn doping, with x = 0.04 attaining the highest value of 0.3712 Ω−1.m−1 in comparison with 0.0002 Ω−1.m−1 for x = 0.00, at 573 K. The activation energy was found to increase in the low temperature region, while it decreases in the high temperature region. The dielectric parameters were enhanced by Sn doping, which introduces surface defects and charge carriers that aid in overcoming the sintering consequences and enhancing the dielectric response.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optoelectronic investigations of needle-shaped Zn_1-xSn_xO nanoparticles synthesized by coprecipitation method

2020

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“…The research outcomes revealed that the doping elements change the ZnO structure. For example, doping elements decrease the crystallite size, increase the crystallinity, and modify the ZnO morphology [ 54 , 55 , 56 , 57 ]. The structural and morphological changes increase the surface-to-volume ratio, creating a more active center at the grain boundaries [ 58 ].…”

Section: Experimental Studiesmentioning

confidence: 99%

Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Pineda-Reyes

Herrera-Rivera

Rojas-Chávez

et al. 2021

Sensors

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Monitoring and detecting carbon monoxide (CO) are critical because this gas is toxic and harmful to the ecosystem. In this respect, designing high-performance gas sensors for CO detection is necessary. Zinc oxide-based materials are promising for use as CO sensors, owing to their good sensing response, electrical performance, cost-effectiveness, long-term stability, low power consumption, ease of manufacturing, chemical stability, and non-toxicity. Nevertheless, further progress in gas sensing requires improving the selectivity and sensitivity, and lowering the operating temperature. Recently, different strategies have been implemented to improve the sensitivity and selectivity of ZnO to CO, highlighting the doping of ZnO. Many studies concluded that doped ZnO demonstrates better sensing properties than those of undoped ZnO in detecting CO. Therefore, in this review, we analyze and discuss, in detail, the recent advances in doped ZnO for CO sensing applications. First, experimental studies on ZnO doped with transition metals, boron group elements, and alkaline earth metals as CO sensors are comprehensively reviewed. We then focused on analyzing theoretical and combined experimental–theoretical studies. Finally, we present the conclusions and some perspectives for future investigations in the context of advancements in CO sensing using doped ZnO, which include room-temperature gas sensing.

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Ga-concentration-dependent optical and electrical properties of Ga-doped ZnO thin films prepared by low-temperature atomic layer deposition

Zhu

Cao

et al. 2022

J Mater Sci: Mater Electron

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Hierarchical porous Ga doped ZnO films synthesized by sol-electrophoretic deposition

Cited by 13 publications

References 40 publications

Optoelectronic investigations of needle-shaped Zn_1-xSn_xO nanoparticles synthesized by coprecipitation method

Optoelectronic investigations of needle-shaped Zn_1-xSn_xO nanoparticles synthesized by coprecipitation method

Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Ga-concentration-dependent optical and electrical properties of Ga-doped ZnO thin films prepared by low-temperature atomic layer deposition

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Hierarchical porous Ga doped ZnO films synthesized by sol-electrophoretic deposition

Cited by 13 publications

References 40 publications

Optoelectronic investigations of needle-shaped Zn1-xSnxO nanoparticles synthesized by coprecipitation method

Optoelectronic investigations of needle-shaped Zn1-xSnxO nanoparticles synthesized by coprecipitation method

Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Ga-concentration-dependent optical and electrical properties of Ga-doped ZnO thin films prepared by low-temperature atomic layer deposition

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Optoelectronic investigations of needle-shaped Zn_1-xSn_xO nanoparticles synthesized by coprecipitation method

Optoelectronic investigations of needle-shaped Zn_1-xSn_xO nanoparticles synthesized by coprecipitation method