Correlation between calcination temperature and optical parameter of zinc oxide (ZnO) nanoparticles

Sangeetha, A.; Seeli, S. Jaya; Bhuvana, K.P.; Kader, M. Abdul; Nayak, Sanjay K.

doi:10.1007/s10971-019-05000-8

Cited by 42 publications

(27 citation statements)

References 19 publications

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“…The diffraction angle at 2θ=36° corresponding to the (101) plane in Zn PPV confirms the presence of hexagonal wurtzite structure of ZnO NPs which coincides with the JCPDS No. 36‐1451 [24,20] . Similarly, in the case of 5 % Zr PPV, the peaks corresponding to the (111) and (002) plane confirms the presence of monoclinic ZrO 2 (m‐ZrO 2 ) which coincides with JCPDS No.…”

Section: Resultssupporting

confidence: 65%

“…The FTIR spectra of both Zn PPV and 1 % Zr PPV were similar to that of MEH‐PPV suggesting that the main structure of the polymer is not breached due to the addition of metal oxide NPs [19] . In Zn PPV FTIR spectra, the characteristics band in the finger print region (435 cm −1 ) indicates the Zn–O stretching, assigned to the E 2 mode of hexagonal ZnO (Raman active) [20] . Similarly, in 1 % Zr PPV, the IR active modes in the fingerprint region correspond to the asymmetric stretching and symmetric stretching frequencies of Zr−O−Zr vibrational bands [21] .…”

Section: Resultsmentioning

confidence: 81%

“…The following are the factors accounting for excellent photostability of ZrO 2 incorporated MEH-PPV are: (1) decrease in polymer chain defects, (2) quenching of triplet excitons and (3) controlled oxygen and moisture diffusion rate by NPs. [20] The presence of excessive defects in pristine MEH-PPV resulted in rapid degradation when exposed to the ambient environment, which leads to photobleaching of the fluorescence moiety from the substrate. Since the in-situ polymerization process draws the polymer chains into the surface of the NPs and facilitates the growth of polymer with reduced kinks, the defect formation in HyNCs was greatly reduced which has been one possible reason for improved photostability.…”

Section: Photostability Analysismentioning

confidence: 99%

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Exciton Dynamics of MEH‐PPV polymer based Nanocomposites: Effect of Molecular Orbital Energy Levels of Nanoparticles**

Kumar

Periyasamy

2022

ChemistrySelect

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Exploring and investigating the strategies to improve quantum efficiency and photostability of light‐emitting polymers in polymer light‐emitting diodes is significantly an important topic of research. Thus this study endeavours towards the determination of the role of molecular orbital energy levels of metal oxide nanoparticles on the performance characteristics of hybrid nanocomposites. This work attempts to vary the proportions of zirconium dioxide (ZrO2) nanoparticles in nanocomposites of poly[2‐methoxy‐5‐(2’‐ethylhexyloxy)‐1,4‐phenylenevinylene] (MEH‐PPV), which leads to a six‐fold enhancement of luminescence quantum efficiency and increased radiative recombination rate due to an appropriate energy level alignment. An improvement in photostability was also reported due to a reduction in polymer chain defects, inhibition of moisture intervention and most importantly, impediment of the photo‐oxidation by controlling the triplet exciton dynamics. Thus, efforts are made to validate the role of energy levels of ZrO2 nanoparticles in improving the luminescence quantum efficiency and photostability of MEH‐PPV compared to ZnO incorporated MEH‐PPV.

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 81%

Section: Photostability Analysismentioning

confidence: 99%

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Exciton Dynamics of MEH‐PPV polymer based Nanocomposites: Effect of Molecular Orbital Energy Levels of Nanoparticles**

Kumar

Periyasamy

2022

ChemistrySelect

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“…A. Sangeetha et al 81 investigated the significance of various calcination temperatures on structural, morphological and optical properties of ZnO. ZnO nanoparticles were synthesized via sol-gel system taking precursors zinc nitrate and sodium hydroxide and DI water as a solvent.…”

Section: Sol-gel Synthesis Of Zno Nanoparticlesmentioning

confidence: 99%

Review—Influence of Processing Parameters to Control Morphology and Optical Properties of Sol-Gel Synthesized ZnO Nanoparticles

Arya

Mahajan

Mahajan³

et al. 2021

ECS J. Solid State Sci. Technol.

220

132

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ZnO has several potential applications into its credit. This review article focuses on the influence of processing parameters involved during the synthesis of ZnO nanoparticles by sol-gel method. During the sol-gel synthesis technique, the processing parameters/experimental conditions can affect the properties of the synthesized material. Processing parameters are the operating conditions that are to be kept under consideration during the synthesis process of nanoparticles so that various properties exhibited by the resulting nanoparticles can be tailored according to the desired applications. Effect of parameters like pH of the sol, additives used (like capping agent, surfactant), the effect of annealing temperature and calcination on the morphology and the optical properties of ZnO nanoparticles prepared via sol-gel technique is analyzed in this study. In this study, we tried to brief the experimental investigations done by various researchers to analyze the influence of processing parameters on ZnO nanoparticles. This study will provide a platform to understand and establish a correlation between the experimental conditions and properties of ZnO nanoparticles prepared through sol-gel route which will be helpful in meeting the desired needs in various application areas.

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“…The process of fabricating ZnO powder is simple as it can be easily prepared using simple equipment and is suitable for up-scale, which can facilitate low-cost production. In addition to the synthesis method, several factors in the synthesis process can lead to diverse ZnO morphologies, such as the specific Zn precursor [20,33], pH [34,35], capping agent [26,36,37], reaction time [38,39], and calcination temperature [40,41] that are used.…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide Synthesis from Extreme Ratios of Zinc Acetate and Zinc Nitrate: Synergistic Morphology

et al. 2022

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The synthesis of ZnO comprising different ratios of zinc acetate (ZA) and zinc nitrate (ZN) from the respective zinc precursor solutions was successfully completed via a simple precipitation method. Zinc oxide powders with different mole ratios of ZA/ZN were produced—80/1, 40/1, and 20/1. The crystallinity, microstructure, and optical properties of all produced ZnO powders were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis-NIR spectrophotometry. The average agglomerated particle sizes of ZnO-80/1, ZnO-40/1, and ZnO-20/1 were measured at 655, 640, and 620 nm, respectively, using dynamic light scattering (DLS). The optical properties of ZnO were significantly affected by the extreme ratio differences in the zinc precursors. ZnO-80/1 was found to have a unique coral-sheet structure morphology, which resulted in its superior ability to reflect near-infrared (NIR) radiation compared to ZnO-40/1 and ZnO-20/1. The NIR-shielding performances of ZnO were assessed using a thermal insulation test, where coating with ZnO-80/1 could lower the inner temperature by 5.2 °C compared with the neat glass substrate. Due to the synergistic effects on morphology, ZnO-80/1 exhibited the property of enhanced NIR shielding in curtailing the internal building temperature, which allows for its utilization as an NIR-reflective pigment coating in the construction of building envelopes.

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Correlation between calcination temperature and optical parameter of zinc oxide (ZnO) nanoparticles

Cited by 42 publications

References 19 publications

Exciton Dynamics of MEH‐PPV polymer based Nanocomposites: Effect of Molecular Orbital Energy Levels of Nanoparticles**

Exciton Dynamics of MEH‐PPV polymer based Nanocomposites: Effect of Molecular Orbital Energy Levels of Nanoparticles**

Review—Influence of Processing Parameters to Control Morphology and Optical Properties of Sol-Gel Synthesized ZnO Nanoparticles

Zinc Oxide Synthesis from Extreme Ratios of Zinc Acetate and Zinc Nitrate: Synergistic Morphology

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