Structural and Magnetic Properties of Zn&lt;SUB&gt;1–x&lt;/SUB&gt;Cu&lt;SUB&gt;x&lt;/SUB&gt;O (0 ≤ x ≤ 0.1) Systems

Mohapatra, Jyoshnarani; Mishra, Dilip Kumar; Berma, V.; Kamilla, Sushanta Kumar; Sakthivel, R.; Mohapatra, B. K.; Singh, Saroj Kumar

doi:10.1166/asl.2011.1228

Cited by 7 publications

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“…The peak corresponding to E 2 (high) vibration mode, centered at 437 cm −1 , is recognized as the band characteristic of the wurtzite phase of ZnO. It strongly depends on the isotropic composition of ZnO and c ‐axis preferred orientation . With increasing fluence, the characteristic peak shift toward high frequency region suggests the presence of compressive stress in the films, which is also confirmed from XRD calculation.…”

Section: Resultssupporting

confidence: 58%

100 keV H⁺ ion irradiation of as‐deposited Al‐doped ZnO thin films: An interest in tailoring surface morphology for sensor applications

Sahoo

Mangal

Mishra

et al. 2018

Surface & Interface Analysis

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We report the influence of 100 keV H + ion beam irradiation on the surface morphology, crystalline structure, and transport properties of as-deposited Al-doped ZnO (Al:ZnO) thin films. The films were deposited on silicon (Si) substrate by using DC sputtering technique. The ion irradiation was carried out at various fluences ranging from 1.0 × 10 12 to 3.0 × 10 14 ions/cm 2 . The virgin and ion-irradiated films were characterized by X-ray diffraction, Raman spectroscopy, atomic force microscopy, and Hall probe measurements. Using X-ray diffraction spectra, 5 points Williamson-Hall plots were drawn to deduce the crystallite site and strain in Al:ZnO films. The analysis of the measurements shows that the films are almost radiation resistant in the structural deformation under chosen irradiation conditions. With beam irradiation, the transport properties of the films are also preserved (do not vary orders of magnitude). However, the surface roughness and the crystallite size, which are crucial parameters of the ZnO film as a gas sensor, are at variation with the ion fluence. As ion fluence increases, the root-mean-square surface roughness oscillates and the surface undergoes for smoothening with irradiation at chosen highest fluence. The crystallite size decreases initially, increases for intermediate fluences, and drops almost to the value of the pristine film at highest fluence. In the paper, these interesting experimental results are discussed in correlations with ion-matter interactions especially energy losses by the ion beam in the material. KEYWORDS Al-doped ZnO, atomic force microscopy, ion beam irradiation, sputtering, thin film 1 | INTRODUCTION The ZnO is a direct wide band gap semiconductor. Due to being nontoxic, inexpensive, and abundant in nature, ZnO finds several potential applications in new technology such as solar cells, piezoelectric, gas sensors, and optoelectronic communication. 1,2 The ZnO has more than one stable crystal structure. It can exist in hexagonal wurtzite as well as in cubic zinc blende structure. This feature of ZnO allows us to synthesize a tetrapod-like morphology with multifunctionality. The synthesis of nano-dimensional tetrapod ZnO with various morphologies, their unique properties, and functional applications such as photocatalytic, UV photodetection, and gas sensing are reported elsewhere. 3-5 By tailoring the morphology, the properties of ZnO can be tuned for diverse applications. For instance, the quasi 1-dimensional ZnO nanowires exhibit piezo-resistivity. 6 The pure ZnO thin films show lack of stability due to thermal edging in air or corrosive environment, and native point defects such as O vacancies make it resistive. 7,8 Therefore, ZnO films are commonly doped with group II and group III metal ions such as indium (In), aluminium (Al), gallium (Ga), copper (Cu), and cadmium (Cd) to enhance its structural, optical, and electrical properties. 9 The indium (In) doping in ZnO improves both electrical and optical properties, but In is toxic and costly as well due to natural...

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Section: Resultssupporting

confidence: 58%

100 keV H⁺ ion irradiation of as‐deposited Al‐doped ZnO thin films: An interest in tailoring surface morphology for sensor applications

Sahoo

Mangal

Mishra

et al. 2018

Surface & Interface Analysis

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“…Similar observations have been obtained for remnant magnetization. The saturation magnetizations observed for 3%, 5% and 7% Cu-doped ZnO nanopowders 28 The saturation magnetization goes on increasing with the increase in Cu concentration. The same trend is followed in nanocrystalline Cu-doped ZnO samples.…”

Section: Resultsmentioning

confidence: 95%

“…However, the saturation magnetization value is much higher than that of conventional sintered specimen. 28 It is reported that the saturation magnetization decreases with the increase in Cu concentration. 16,17 The super-exchange interaction in between the Cu atoms suppressing the ferromagnetic nature is the reason behind the decrease of saturation magnetization.…”

Section: Resultsmentioning

confidence: 99%

“…17 However, our earlier work on Cu-doped ZnO system showed enhanced nature of ferromagnetism with increased percentage of Cu. 28 The increased percentage of secondary phases like CuO distorts the lattice structure and contracts the unit cell structure of ZnO. The induced lattice defects in the form of zinc interstitials and oxygen vacancies are treated as the source of enhanced ferromagnetism.…”

Section: Introductionmentioning

confidence: 99%

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ENHANCEMENT OF FERROMAGNETISM IN NANOCRYSTALLINE Zn_1-xCu_xO(0.03 ≤ x ≤ 0.07)

Mohapatra

Mishra

et al. 2011

NANO

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We report room temperature ferromagnetism (RTFM) in nanocrystalline Zn 1−x Cu x O (0.03 ≤ x ≤ 0.07) materials synthesized by autocombustion technique. The average particle sizes are in the range of 60 nm. The saturation magnetization and coercivity of 7% Cu-doped ZnO is enhanced significantly in comparison to 3% and 5% Cu-doped ZnO. There is not much variation in the optical band gap due to Cu doping, thus suggesting the uniform distribution of Cu in the ZnO matrix. Micro-Raman and photoluminescence analysis predict the presence of clusters of oxygen vacancies in Cu-doped system which improves with the increase in Cu concentration. This study provides further evidence that oxygen vacancies play an important role in the enhancement of room temperature ferromagnetic property in Cu-doped ZnO. . Downloaded from www.worldscientific.com by NANYANG TECHNOLOGICAL UNIVERSITY on 08/24/15. For personal use only.388 J. Mohapatra et al.

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“…HRTEM images of as-synthesized nanoparticles of (a)12.5 nm and (b) 22.5 nm. Delivered by Publishing Technology to: McMaster University IP: 109.161.229.147 On: Mon, 12 Oct 2015 07:59:01 Copyright: American Scientific Publishers Ni et al Effects of PEG Length and Iron Oxide Nanoparticles Size on Reduced Protein Adsorption Non-Specific Macrophage Cells Scheme 1.…”

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confidence: 99%

Effects of PEG Length and Iron Oxide Nanoparticles Size on Reduced Protein Adsorption and Non-Specific Uptake by Macrophage Cells

Jiang²,

Yang³

et al. 2012

j nanosci nanotechnol

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At present, the studies showed that applications of magnetic iron oxide nanoparticels in vivo are hampered by their non-specific uptake by the innate immune system. And surface PEGylation of the nanoparticles maybe a feasible approach to escape from the reticular-endothelial system for a long blood circulation half-life. In this paper, we synthesized two sizes of monodisperse nanoparticles and studied the effects of PEG length on reduced protein adsorption and non-specific uptake by macrophage cells for an ideal material with a relatively long blood half-life. The results show that small nanoparticles with high molecular weight PEGylation may be a more applicable candidate due to their size effect and high efficiency in reducing protein adsorption.

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Structural and Magnetic Properties of Zn<SUB>1–x</SUB>Cu<SUB>x</SUB>O (0 ≤ x ≤ 0.1) Systems

Cited by 7 publications

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100 keV H⁺ ion irradiation of as‐deposited Al‐doped ZnO thin films: An interest in tailoring surface morphology for sensor applications

100 keV H⁺ ion irradiation of as‐deposited Al‐doped ZnO thin films: An interest in tailoring surface morphology for sensor applications

ENHANCEMENT OF FERROMAGNETISM IN NANOCRYSTALLINE Zn_1-xCu_xO(0.03 ≤ x ≤ 0.07)

Effects of PEG Length and Iron Oxide Nanoparticles Size on Reduced Protein Adsorption and Non-Specific Uptake by Macrophage Cells

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Structural and Magnetic Properties of Zn<SUB>1–x</SUB>Cu<SUB>x</SUB>O (0 ≤ x ≤ 0.1) Systems

Cited by 7 publications

References 0 publications

100 keV H+ ion irradiation of as‐deposited Al‐doped ZnO thin films: An interest in tailoring surface morphology for sensor applications

100 keV H+ ion irradiation of as‐deposited Al‐doped ZnO thin films: An interest in tailoring surface morphology for sensor applications

ENHANCEMENT OF FERROMAGNETISM IN NANOCRYSTALLINE Zn1-xCuxO(0.03 ≤ x ≤ 0.07)

Effects of PEG Length and Iron Oxide Nanoparticles Size on Reduced Protein Adsorption and Non-Specific Uptake by Macrophage Cells

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100 keV H⁺ ion irradiation of as‐deposited Al‐doped ZnO thin films: An interest in tailoring surface morphology for sensor applications

100 keV H⁺ ion irradiation of as‐deposited Al‐doped ZnO thin films: An interest in tailoring surface morphology for sensor applications

ENHANCEMENT OF FERROMAGNETISM IN NANOCRYSTALLINE Zn_1-xCu_xO(0.03 ≤ x ≤ 0.07)