“…This means that ZnO NRs are a prospective material for many applications in PDs [8], flame sensing [9] and sensors [10] and they have been synthesized through various growth methods such as laser pulse deposition [11], chemical vapor deposition [12], hydrothermal methods [13] and sol-gel methods [14]. Among these methods, hydrothermal methods are used to synthesize ZnO NRs due to their advantages of simple experimental steps, low-temperature [15] and low-cost [16].…”
Zinc oxide nanorods (ZnO NRs) were modified by decorating with silver (Ag) nanoparticles to enhance visible absorption. The morphology, structure and optical properties of the modified ZnO NRs were investigated by scanning electron microscopy, x-ray diffraction and UV–vis absorption spectroscopy. Photodetectors (PDs) based on the modified ZnO NRs successfully detected visible radiation. The result showed high performance of the visible sensor (λ = 400 nm) with a maximum responsivity of 46 mA W−1. The photoconductive gain of Ag/ZnO NR-based PDs was 5.8 times higher than that of pure ZnO NR ones. With their enhanced visible absorption, the multi-modified ZnO NRs are suitable for practical applications, especially in optoelectronic devices operating in the visible region.
“…This means that ZnO NRs are a prospective material for many applications in PDs [8], flame sensing [9] and sensors [10] and they have been synthesized through various growth methods such as laser pulse deposition [11], chemical vapor deposition [12], hydrothermal methods [13] and sol-gel methods [14]. Among these methods, hydrothermal methods are used to synthesize ZnO NRs due to their advantages of simple experimental steps, low-temperature [15] and low-cost [16].…”
Zinc oxide nanorods (ZnO NRs) were modified by decorating with silver (Ag) nanoparticles to enhance visible absorption. The morphology, structure and optical properties of the modified ZnO NRs were investigated by scanning electron microscopy, x-ray diffraction and UV–vis absorption spectroscopy. Photodetectors (PDs) based on the modified ZnO NRs successfully detected visible radiation. The result showed high performance of the visible sensor (λ = 400 nm) with a maximum responsivity of 46 mA W−1. The photoconductive gain of Ag/ZnO NR-based PDs was 5.8 times higher than that of pure ZnO NR ones. With their enhanced visible absorption, the multi-modified ZnO NRs are suitable for practical applications, especially in optoelectronic devices operating in the visible region.
“…There are many approaches for the growth of ZnO nanostructures such as catalytic growth via vapor liquid solid (VLS) mechanism [ 21 , 22 ], thermal evaporation [ 23 , 24 , 25 ], pulsed laser deposition (PLD) [ 26 , 27 ], hydrothermal growth [ 28 , 29 , 30 , 31 ], rapid hydrothermal growth [ 32 , 33 , 34 ], and wet chemical processing [ 35 , 36 , 37 ], etc. The choice of the growth technique is dictated by the requirements of the application.…”
Vertically-oriented zinc oxide (ZnO) nanowires were synthesized on glass and silicon substrates by Pulsed Laser Deposition and without the use of a catalyst. An intermediate c-axis oriented nanotextured ZnO seed layer in the form of nanowall network with honey comb structure allows the growth of high quality, self-forming, and vertically-oriented nanowires at relatively low temperature (<400 °C) and under argon atmosphere at high pressure (>5 Torr). Many parameters were shown to affect the growth of the ZnO nanowires such as gas pressure, substrate–target distance, and laser energy. Growth of a c-axis-crystalline array of nanowires growing vertically from the energetically favorable sites on the seed layer is observed. Nucleation occurs due to the matching lattice structure and the polar nature of the ZnO seed layer. Morphological, structural, and optical properties were investigated. X-ray diffraction (XRD) revealed highly c-axis aligned nanowires along the (002) crystal plane. Room temperature photoluminescence (PL) measurements showed a strong and narrow bandwidth of Ultraviolet (UV) emission, which shifts to lower wavelength with the increase of pressure.
“…Also, in the case of PAZT composite fibers, the peak is not observed in the visible region; this shows the suppression or removal of defect sites that are present in PZT fibers. It may be due to Ag particles that may be trapped in ZnO defect sites and electron transfer takes place between the energy levels of ZnO and Ag metal nanoparticles (Shahi et al 2020 ). Fig.…”
Membrane technology is an advanced approach to making a healthier and cleaner environment. Using such catalytic membrane technology to get clean, usable water by removal of dye impurities as well as pathogenic microbes is the main goal behind the research work. Here, we present the synthesis and efficacy study of polymethyl methacrylate (PMMA)-based Ag/ ZnO/TiO 2 trimetallic bifunctional nanofibers with antibacterial and photocatalytic activity. The nanofibers have been proven to be effective for the degradation of methylene blue (MB 93.4%), rhodamine B (Rh 34.6%), auramine-O (Au 65.0%) and fuchsin basic (FB 69.8%) dyes individually within 90 min in daylight. The study is further extended in abating a mixture of these dyes from contaminated water using composite nanofibers. Also, in the case of a mixture of these dyes (3 ppm each), nanofibers show dye degradation efficiency (DDE) of 90.9% (MB), 62.4% (Au) and 90.3% (FB and Rh) in 60 min. The role of Ag nanoparticles with a synergic photocatalytic effect on ZnO and TiO 2 is also demonstrated. Also, PMMA/ZnO/TiO 2 composite fiber membrane in synergy with silver particles shows better antibacterial activity against Gram-negative bacteria E. coli, making PMMA/Ag/ZnO/TiO 2 fibers a promising candidate in water purification.
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