Calcined Solution-Based PVP Influence on ZnO Semiconductor Nanoparticle Properties

Kamari, Halimah Mohamed; Al‐Hada, Naif Mohammed; Saion, Elias; Shaari, Abdul Halim; Talib, Zainal Abidin; Flaifel, Moayad Husein; Ahmed, Abdullah Ahmed Ali

doi:10.3390/cryst7020002

Cited by 42 publications

(25 citation statements)

References 69 publications

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“…While linking the influence of several PVP amounts, it is evident that along with a decrease in particle size, higher amounts of PVP result in a reduction in intensity of the emission. This is in good agreement with the findings of other researchers on the effects of PVP on optical and structural properties of metal oxide NPs [10,11].…”

Section: Photoluminescence Studysupporting

confidence: 93%

“…Inorganic metal oxide semiconductor NPs formed in the polymer matrices had attracted significant attention, due to the outstanding characteristics of the materials [9][10][11][12].The NPs fabricated in such manner exhibited interesting properties such as optical, electrical, magnetic, catalytic, and mechanical features that were distinct from those observed in their molecular and bulk materials counterparts [13][14][15]. Willemite or zinc silicate (Zn 2 SiO 4 ) belongs to the families of functional inorganic semiconductor materials, and it has been reported to have potentials for phosphors applications [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Effects of polyvinylpyrrolidone on structural and optical properties of willemite semiconductor nanoparticles by polymer thermal treatment method

Alibe

Матори

Sidek

et al. 2018

J Therm Anal Calorim

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Willemite is an inorganic semiconductor material used for optoelectronic applications. The present study purposes a new polymer thermal treatment method involving calcination temperature to fabricate the willemite nanoparticles. The effects of polyvinylpyrrolidone (PVP) on the structural and optical properties of the material were thoroughly investigated. Thermogravimetric and its derivative confirmed the decomposition behavior of PVP. The minimum calcination temperature to decompose PVP was appraised at 740°C. The FTIR and the Raman analyses confirmed the presence of organic source before the calcination process and the formation of the crystalline structure of the willemite nanoparticles after the heat treatment. The optimum PVP concentration in this study based on the FTIR results was found to be 40 g L-1. This is the minimum concentration at which the willemite nanoparticles remained pure with homogenous distribution. X-ray diffraction analysis of the PVP samples before calcination was confirmed to be amorphous, and upon calcination between 800 and 1000°C, an a-willemite phase was obtained. The morphology and the average particle size were determined with FESEM and HR-TEM analysis. The average particle size is between 23.8 and 36.7 nm. The optical energy band was found to be increasing from 5.24 to 5.32 eV with the corresponding increase in PVP concentration from 20 to 50 g L-1. The findings in this study provides a new pathway to understand the effects of PVP concentrations on the structural and optical properties of willemite semiconductor nanoparticles as it may have key potential applications for future optoelectronic devices.

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Section: Photoluminescence Studysupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effects of polyvinylpyrrolidone on structural and optical properties of willemite semiconductor nanoparticles by polymer thermal treatment method

Alibe

Матори

Sidek

et al. 2018

J Therm Anal Calorim

View full text Add to dashboard Cite

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“…To investigate the interactions of the chemical component and phase composition of metallic salts and PVP, Figure 3a–e illustrates the FT–IR spectrum of the samples before and after calcination process. The uncalcined sample at room temperature presented in Figure 3a exhibits several absorption peaks at bands of 3414, 2945, 1648, 1428, 1278, 850, and 639 cm –1 related to the presence of organic source from PVP [41,42,50,51,52]. For more comprehensive details on the FT–IR bands and their assignment, a tabular presentation is provided in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Effects of Calcination Holding Time on Properties of Wide Band Gap Willemite Semiconductor Nanoparticles by the Polymer Thermal Treatment Method

et al. 2018

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Willemite is a wide band gap semiconductor used in modern day technology for optoelectronics application. In this study, a new simple technique with less energy consumption is proposed. Willemite nanoparticles (NPs) were produced via a water–based solution consisting of a metallic precursor, polyvinylpyrrolidone (PVP), and underwent a calcination process at 900 °C for several holding times between 1–4 h. The FT–IR and Raman spectra indicated the presence of metal oxide bands as well as the effective removal of PVP. The degree of the crystallization and formation of the NPs were determined by XRD. The mean crystallite size of the NPs was between 18.23–27.40 nm. The morphology, particle shape and size distribution were viewed with HR-TEM and FESEM analysis. The willemite NPs aggregate from the smaller to larger particles with an increase in calcination holding time from 1–4 h with the sizes ranging between 19.74–29.71 nm. The energy values obtained from the experimental band gap decreased with increasing the holding time over the range of 5.39 eV at 1 h to at 5.27 at 4 h. These values match well with band gap obtained from the Mott and Davis model for direct transition. The findings in this study are very promising and can justify the use of these novel materials as a potential candidate for green luminescent optoelectronic applications.

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“…Intensive research of ZnO nanomaterials (NMs) enabled finding new potential applications for them, e.g., in electronics, dentistry, pharmacy, biomedicine, agriculture, photovoltaics, or for the modification of liquid crystals [1,3,[17][18][19][20][21][22]. It is common knowledge that the properties of NMs can be controlled by changing their size, shape, chemical composition and modifying their surface, e.g., by polymer coating or selective molecule addition.…”

Section: Introductionmentioning

confidence: 99%

Size Control of Cobalt-Doped ZnO Nanoparticles Obtained in Microwave Solvothermal Synthesis

et al. 2018

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This article presents the method of size control of cobalt-doped zinc oxide nanoparticles (Zn 1−x Co x O NPs) obtained by means of the microwave solvothermal synthesis. Zinc acetate dihydrate and cobalt(II) acetate tetrahydrate dissolved in ethylene glycol were used as the precursor. It has been proved by the example of Zn 0.9 Co 0.1 O NPs (x = 10 mol %) that by controlling the water quantity in the precursor it is possible to precisely control the size of the obtained Zn 1−x Co x O NPs. The following properties of the obtained Zn 0.9 Co 0.1 O NPs were tested: skeleton density (helium pycnometry), specific surface area (BET), dopant content (ICP-OES), morphology (SEM), phase purity (XRD), lattice parameter (Rietveld method), average crystallite size (FW1/5/4/5M method and Scherrer's formula), crystallite size distribution (FW1/5/4/5M method), and average particle size (from TEM and SSA). An increase in the water content in the precursor between 1.5% and 5% resulted in the increase in Zn 0.9 Co 0.1 O NPs size between 28 nm and 53 nm. The X-ray diffraction revealed the presence of only one hexagonal phase of ZnO in all samples. Scanning electron microscope images indicated an impact of the increase in water content in the precursor on the change of size and shape of the obtained Zn 0.9 Co 0.1 O NPs. The developed method of NPs size control in the microwave solvothermal synthesis was used for the first time for controlling the size of Zn 1−x Co x O NPs. Keywords: Co 2+-doped zinc oxide nanoparticles (Zn 1−x Co x O NPs); cobalt-doped ZnO NPs; size control of Co 2+-doped ZnO NPs; synthesis and characterisation of Co 2+-doped ZnO NPs; microwave solvothermal synthesis (MSS) of Co 2+-doped NPs; microwave-assisted synthesis of Co 2+-doped NPs; microwave reactor

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Calcined Solution-Based PVP Influence on ZnO Semiconductor Nanoparticle Properties

Cited by 42 publications

References 69 publications

Effects of polyvinylpyrrolidone on structural and optical properties of willemite semiconductor nanoparticles by polymer thermal treatment method

Effects of polyvinylpyrrolidone on structural and optical properties of willemite semiconductor nanoparticles by polymer thermal treatment method

Effects of Calcination Holding Time on Properties of Wide Band Gap Willemite Semiconductor Nanoparticles by the Polymer Thermal Treatment Method

Size Control of Cobalt-Doped ZnO Nanoparticles Obtained in Microwave Solvothermal Synthesis

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