Effect of size reduction on structural and optical properties of ZnO matrix due to successive doping of Fe ions

Hassan, Mohammed; Khan, Wasi; Azam, Ameer; Naqvi, Andleeb Z.

doi:10.1016/j.jlumin.2013.06.024

Cited by 126 publications

(49 citation statements)

References 43 publications

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“…Various researchers [22][23][24] have reported that the strain in the samples is inversely proportional to the crystallite size, and this is clearly observed in the above results also. The strain may be caused by the change in the bondlength due to a change in the values of lattice constants (a and c) [23] and due to charge-carrier gradient within the crystal structure, resulting in overall shrinkage of the crystallite size. From the crystallite size vs. molar ratio plot (Fig.…”

Section: X-ray Diffraction (Xrd) Analysissupporting

confidence: 71%

“…The diffraction peaks are also broadened which represents smaller crystallite size of the material. Small variation in the intensity and broadening of peaks represents the rearrangement of crystal plane according to synthesis conditions [23]. Also reduction of the values of cell parameters: a and c indicates the presence of some stress or strain in the crystal lattice of the samples [22,23].…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

“…Small variation in the intensity and broadening of peaks represents the rearrangement of crystal plane according to synthesis conditions [23]. Also reduction of the values of cell parameters: a and c indicates the presence of some stress or strain in the crystal lattice of the samples [22,23]. The strain observed in the samples can be explained by the Uniform Deformation Model (UDM) using Williamson-Hall (W-H) plot [22,24] which claims that the diffraction line broadening is due to strain ( ) effect and reduction in crystallite size.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

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Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Koutu

Shastri

Malik

2016

Materials Science-Poland

101

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In the present work, powder zinc oxide samples were prepared by varying NaOH concentration (0.1 M -0.4 M) using wet-chemical co-precipitation method. As-synthesized ZnO was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence (PL) and Raman spectroscopy. Formation of hexagonal wurtzite structure of the ZnO samples has been revealed from XRD studies. This study further suggests reduction in crystallite size from 40 nm to 23 nm with an increase in NaOH concentration which is confirmed by FESEM. PL and Raman spectroscopy studies of these samples show significant peak shift towards the higher and lower energy respectively, with maximum PL emission between 400 nm and 470 nm region of the visible spectrum. Noticeable inverse relationship between optical properties of ZnO nanoparticles and NaOH concentration may be attributed to the rapid nucleation during the synthesis process. With these remarkable properties, ZnO nanoparticles may find applications in nanoelectronic devices, sensors, nanomedicine, GATE dielectrics, photovoltaic devices, etc.

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Section: X-ray Diffraction (Xrd) Analysissupporting

confidence: 71%

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

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Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Koutu

Shastri

Malik

2016

Materials Science-Poland

101

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“…In 1980s, a considerable progress was achieved in the field of material science to understand the size related properties of the materials [1]. ZnO is II-VI semiconductor compound with tuneable wide band gap energy of ∼3.4 eV and a large exciton binding energy of 60 meV at room temperature [2]. Nanocrystalline ZnO exhibits variety of morphological structures like nanorods, nanowires, nanoribbon, nanoflower, nanowalls, quantum dots, nanopyramids, etc.…”

Section: Introductionmentioning

confidence: 99%

Investigation of physical properties of screen printed nanosized ZnO films for optoelectronic applications

Zargar

Arora

Hafiz

2015

Eur. Phys. J. Appl. Phys.

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Abstract. Nanosized ZnO particles derived from chemical co-precipitation route were used for casting ZnO films by screen printing method followed by sintering at two different temperatures. The variation in structural, optical and electrical properties of these films with temperature have been investigated by XRD, SEM, FTIR, Raman, UV-VIS, EPR and four probe analytical techniques. XRD patterns of these films exhibit polycrystalline nature with hexagonal wurtzite structure and SEM images reveal the smooth, dense and without any cracks/damage porous surface morphology. Infrared transmission spectra shows peaks pertaining to Zn-O stretching modes and their multiphonon modes. While Raman spectra exhibited strong peaks of E 2 (high) phonon and overtone of surface phonon mode at 429 cm −1 and 1144 cm −1 respectively with weak components of LO and TO branches. The direct band gap energy of these films showed narrowing of band gap from 3.21 eV to 3.12 eV on increasing sintering temperature from 500 • C to 600 • C. DC conductivity measurements confirmed semiconducting behaviour and showed lowering of activation energy. EPR spectra showed single narrow line resonance signal of g-value ∼ 1.9469 due to oxygen vacancies which are produced during synthesis of ZnO nanoparticles by sol-gel process. These studies revealed that on increasing sintering temperature the crystallinity of the film improves with reduction in lattice deformations in these screen printed ZnO films.

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“…ZnO is an important group II-VI metal oxide semiconductor with a wide direct band gap [3]. It exhibits n-type semiconducting properties and occupies a special place among wide band gap semiconductors (such as GaN, ZnS), which have been extensively studied because of increased need for solid state light sources and detectors in the blue and UV spectral ranges [4,5].…”

Section: Introductionmentioning

confidence: 99%