Study of Optical and Structural Properties of Zinc Oxide Nanofibers by Using Zn(ac)2/PVA Precursors

Kavosh, Masoud; Moallemian, H.; Molaei, Hamidreza; Mehranniya, H.; Salami, M.; Dehdashti, M. E.

doi:10.1080/15533174.2014.963248

Cited by 4 publications

(4 citation statements)

References 45 publications

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“…The IR spectra in figure 7(b) show vibration bands at around 476 cm −1 attributed to the Zn-O vibrations of ZnO samples [51]. The FTIR spectra results obtained from our work are in line with results reported in the literature [49,52,53]. The remaining FTIR spectra (of pyrolyzed fibers) are included in ESI 7.1.…”

Section: Ftir Spectroscopysupporting

confidence: 87%

“…The calculated bandgap energies of the samples pyrolyzed at different temperatures are summarized in table 4. From the literature, it is reported bandgap energy increased with the pyrolysis temperature for pure ZnO films due to the presence of defects, structural orders, and disorders in the samples [53,[60][61][62][63]. The change in crystal size during the pyrolysis process also causes the change in energy bandgap [64].…”

Section: Optical Propertiesmentioning

confidence: 99%

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Understanding the interplay of solution and process parameters on the physico-chemical properties of ZnO nanofibers synthesized by sol-gel electrospinning

Prabhu,

Rajendra,

Anandhan

et al. 2023

Mater. Res. Express

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Aging populations and the increase in chronic diseases worldwide demand efficient healthcare tools for simple, rapid, and accurate diagnosis and monitoring the human health. In this context, gas sensors are used to analyze the type of gas in the breath to diagnose chronic diseases. Metal oxide and ceramic nanofibers (NFs) produced by the electrospinning (ES) method have been investigated for potential use as gas sensors in engineering and medical sectors. The material and process parameters are the main influencing factors on the functional performance of electrospun metal oxide NFs. Zinc oxide (ZnO) based NFs are used in various gas sensors due to the wide band gap (3.37eV), large exciton binding energy, and high mobility of charge carriers of ZnO. In this research, we made an attempt to study the effect of poly(vinyl alcohol) (PVA) and zinc acetate dihydrate (ZnAc2) concentrations and feed rate, voltage, spinneret tip-to-collector distance (TCD), and pyrolysis temperature on the physical properties of ZnO NFs. An average fiber diameter of 119 nm was obtained after pyrolysis at 600° C of electrospun fiber produced from an aqueous PVA solution of concentration 15 w/v% with 7.5 w% ZnAc2 based on the weight of PVA. The grain size, transmittance, structural defects and band gap energy of NFs were found to increase as a function of the pyrolysis temperature, which could be beneficial for the functional applications of these NFs.

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Section: Ftir Spectroscopysupporting

confidence: 87%

Section: Optical Propertiesmentioning

confidence: 99%

Understanding the interplay of solution and process parameters on the physico-chemical properties of ZnO nanofibers synthesized by sol-gel electrospinning

Prabhu,

Rajendra,

Anandhan

et al. 2023

Mater. Res. Express

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“…The XRD pa ern of ZnO shows that it matches well with the known hexagonal structure of zinc oxide PDF #36-1451, confirming the expected crystal structure. The peaks at 31.7°, 34.4°, 36.2°, 47.5°, 56.6°, 62.9°, 66.4°, 68.0°, and 69.1° are indexed to the (100), (002), (101), ( 102), ( 110), ( 103), ( 200), (112), and (201) planes of hexagonal ZnO crystals in the nanofibers [30].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photodegradation of Acetaminophen Using Efficient ZnO-NiO Nanofibers

Gomaa,

El-Maghrabi,

Gomaa

et al. 2024

Catalysts

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The increasing presence of pharmaceutical pollutants, such as acetaminophen, in water bodies poses a significant environmental challenge due to their persistence and potential toxicity. This study investigated the enhanced photodegradation of acetaminophen using ZnO-NiO nanofibers as superior photocatalysts. The nanofibers synthesized with varying NiO contents (designated as ZN0.5, ZN1, ZN1.5, and ZN2), were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman, FTIR, Brunauer–Emmett–Teller (BET) analysis, and diffuse reflectance spectroscopy (DRS) to elucidate their structural, morphological, and optical properties. Thermogravimetric analysis (TGA) indicated that the nanofibers exhibit high thermal stability, with major weight loss attributed to the decomposition of the polymer matrix and residual organics. The BET analysis revealed that the specific surface area remains stable after increasing the NiO content up to a certain ratio. This stability correlates with the enhanced photocatalytic performance due to increased light absorption and improved charge separation. The diffuse reflectance spectra and Kubelka–Munk plots demonstrated a reduction in bandgap energy with higher NiO content, facilitating greater visible light absorption. Photocatalytic experiments under visible light irradiation, in the presence of peroxymonosulfate (PMS), showed that the ZN1.5 nanofibers achieved the highest acetaminophen degradation rate, i.e., 92%, within 3 h. Mechanistic studies, supported by radical trapping experiments, revealed that the improved photocatalytic efficiency is due to the synergistic effects of ZnO and NiO heterojunctions, which enhance charge separation and reactive oxygen species (ROS) generation. This research highlights the potential of ZnO-NiO nanofibers as effective photocatalysts for the degradation of pharmaceutical pollutants. The findings demonstrate that optimizing the composition and structure of nanofibers can significantly improve their environmental remediation capabilities, providing a promising solution for sustainable water treatment.

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“…35,36 Antibacterial activity, catalysis, gas sensors, and diodes are further examples of suitable applications. [37][38][39][40] Different ZnO nanomaterial forms (such as nanorods, 41,42 nanotubes and nanowires, 43,44 nanocrystals, 45,46 nanoclusters, 47 nanofibers, 48,49 and numerous forms nanostructures) have been produced by using various methods whereas these materials revealed that different characteristics allowed for several applications to be practically produced. 50,51 As can be seen from literature, several techniques such as precipitation, 52 microwave hydrothermal, 53 sonochemical, 54,55 solvothermal, 56 chemical, 57,58 thermal treatment, 59 and sol-gel 60,61 can be used to create ZnO nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Down-top nanofabrication of binary (CdO)x  (ZnO)1-x nanoparticles and their antibacterial activity

Al‐Hada¹,

Kamari²,

Abdullah³

et al. 2017

IJN

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In the present study, binary oxide (cadmium oxide [CdO]) x (zinc oxide [ZnO]) 1–x nanoparticles (NPs) at different concentrations of precursor in calcination temperature were prepared using thermal treatment technique. Cadmium and zinc nitrates (source of cadmium and zinc) with polyvinylpyrrolidone (capping agent) have been used to prepare (CdO) x (ZnO) 1–x NPs samples. The sample was characterized by X-ray diffraction (XRD), scanning electron microscopy, energy-dispersive X-ray (EDX), transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy. XRD patterns analysis revealed that NPs were formed after calcination, which showed a cubic and hexagonal crystalline structure of (CdO) x (ZnO) 1–x NPs. The phase analysis using EDX spectroscopy and FTIR spectroscopy confirmed the presence of Cd and Zn as the original compounds of prepared (CdO) x (ZnO) 1–x NP samples. The average particle size of the samples increased from 14 to 33 nm as the concentration of precursor increased from x=0.20 to x=0.80, as observed by TEM results. The surface composition and valance state of the prepared product NPs were determined by X-ray photoelectron spectroscopy (XPS) analyses. Diffuse UV–visible reflectance spectra were used to determine the optical band gap through the Kubelka–Munk equation; the energy band gap was found to decrease for CdO from 2.92 to 2.82 eV and for ZnO from 3.22 to 3.11 eV with increasing x value. Additionally, photoluminescence (PL) spectra revealed that the intensity in PL increased with an increase in particle size. In addition, the antibacterial activity of binary oxide NP was carried out in vitro against Escherichia coli ATCC 25922 Gram (−ve), Salmonella choleraesuis ATCC 10708, and Bacillus subtilis UPMC 1175 Gram (+ve). This study indicated that the zone of inhibition of 21 mm has good antibacterial activity toward the Gram-positive B. subtilis UPMC 1175.

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Study of Optical and Structural Properties of Zinc Oxide Nanofibers by Using Zn(ac)₂/PVA Precursors

Cited by 4 publications

References 45 publications

Understanding the interplay of solution and process parameters on the physico-chemical properties of ZnO nanofibers synthesized by sol-gel electrospinning

Understanding the interplay of solution and process parameters on the physico-chemical properties of ZnO nanofibers synthesized by sol-gel electrospinning

Enhanced Photodegradation of Acetaminophen Using Efficient ZnO-NiO Nanofibers

Down-top nanofabrication of binary (CdO)<sub>x</sub> <br />(ZnO)<sub>1-x</sub> nanoparticles and their antibacterial activity

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Study of Optical and Structural Properties of Zinc Oxide Nanofibers by Using Zn(ac)2/PVA Precursors

Cited by 4 publications

References 45 publications

Understanding the interplay of solution and process parameters on the physico-chemical properties of ZnO nanofibers synthesized by sol-gel electrospinning

Understanding the interplay of solution and process parameters on the physico-chemical properties of ZnO nanofibers synthesized by sol-gel electrospinning

Enhanced Photodegradation of Acetaminophen Using Efficient ZnO-NiO Nanofibers

Down-top nanofabrication of binary (CdO)<sub>x</sub>&nbsp;<br />(ZnO)<sub>1-x</sub>&nbsp;nanoparticles and their antibacterial activity

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Product

Resources

About

Study of Optical and Structural Properties of Zinc Oxide Nanofibers by Using Zn(ac)₂/PVA Precursors

Down-top nanofabrication of binary (CdO)<sub>x</sub> <br />(ZnO)<sub>1-x</sub> nanoparticles and their antibacterial activity