Dislocations and particle size governed band gap and ferromagnetic ordering in Ni doped ZnO nanoparticles synthesized via co-precipitation

Saikat Chattopadhyay, Kamakhya Prakash Misra, Arunava Agarwala, Aga Shahee, Sukriti Jain, Nilanjan Halder, Ashok Rao, P. D. Babu, Mukesh Saran, Anoop Kumar Mukhopadhyay

Research output: Contribution to journalArticle

Abstract

To the best of our knowledge, the present work is the first ever report on how the Ni dopant concentration affects the dislocation density, band gap and most importantly the diamagnetic to ferromagnetic transition in ZnO nanoparticles (NPs), well known for multifunctional applications. For this purpose, undoped and Ni doped (1, 3, 5, and 7 at. wt.%) Wurtzite phase ZnO nanoparticles (NPs in size range 13–34 nm) are synthesized by sol-gel co-precipitation technique. As a function of the dopant concentrations (c), the polycrystalline NPs are characterized by XRD, Williamson-Hall plot, Rietveld refinement, UV–Vis spectroscopy, band-gap evaluation, dislocation density estimation, photoluminescence (PL) spectra, scanning electron microscopy (SEM),vibrating sample magnetometer (VSM) based magnetic moment (M) versus magnetic field (H) measurement, magnetic hysteresis measurement and resistivity (ρ) measurement. The results confirm that the dislocations density (δ(hkl)) along the (002) peak of XRD pattern governs the band gap energy (Eg) estimated from the corresponding Tauc's plot. Further, both δ(hkl) and Eg exhibit interesting empirical dependencies on c. The PL spectra of all the NPs show the blue emission due to Zn interstitials. The SEM based photomicrographs prove the presence of the elongated spherical i.e, elliptical sub-structures forming a chain-like distribution in the microstructures which are sensitive to c. Further, the M-H loop reveal a transition from diamagnetic to ferromagnetic behavior as the presence of Ni in ZnO matrix enhances. A similar behavior is exhibited by ρ. These results are finally summarized in terms of structure-property correlations. The implications of the present materials in terms of possible futuristic applications are also discussed.

Original languageEnglish
Pages (from-to)23341-23354
Number of pages14
JournalCeramics International
Volume45
Issue number17
DOIs
Publication statusPublished - 01-12-2019

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Coprecipitation
Energy gap
Particle size
Nanoparticles
Photoluminescence
Doping (additives)
Magnetic hysteresis
Scanning electron microscopy
Rietveld refinement
Magnetometers
Magnetic moments
Sol-gels
Spectroscopy
Magnetic fields
Microstructure

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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Chattopadhyay, S., Misra, K. P., Agarwala, A., Shahee, A., Jain, S., Halder, N., ... Mukhopadhyay, A. K. (2019). Dislocations and particle size governed band gap and ferromagnetic ordering in Ni doped ZnO nanoparticles synthesized via co-precipitation. Ceramics International, 45(17), 23341-23354. https://doi.org/10.1016/j.ceramint.2019.08.034
Chattopadhyay, Saikat ; Misra, Kamakhya Prakash ; Agarwala, Arunava ; Shahee, Aga ; Jain, Sukriti ; Halder, Nilanjan ; Rao, Ashok ; Babu, P. D. ; Saran, Mukesh ; Mukhopadhyay, Anoop Kumar. / Dislocations and particle size governed band gap and ferromagnetic ordering in Ni doped ZnO nanoparticles synthesized via co-precipitation. In: Ceramics International. 2019 ; Vol. 45, No. 17. pp. 23341-23354.
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Chattopadhyay, S, Misra, KP, Agarwala, A, Shahee, A, Jain, S, Halder, N, Rao, A, Babu, PD, Saran, M & Mukhopadhyay, AK 2019, 'Dislocations and particle size governed band gap and ferromagnetic ordering in Ni doped ZnO nanoparticles synthesized via co-precipitation', Ceramics International, vol. 45, no. 17, pp. 23341-23354. https://doi.org/10.1016/j.ceramint.2019.08.034

Dislocations and particle size governed band gap and ferromagnetic ordering in Ni doped ZnO nanoparticles synthesized via co-precipitation. / Chattopadhyay, Saikat; Misra, Kamakhya Prakash; Agarwala, Arunava; Shahee, Aga; Jain, Sukriti; Halder, Nilanjan; Rao, Ashok; Babu, P. D.; Saran, Mukesh; Mukhopadhyay, Anoop Kumar.

In: Ceramics International, Vol. 45, No. 17, 01.12.2019, p. 23341-23354.

Research output: Contribution to journalArticle

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T1 - Dislocations and particle size governed band gap and ferromagnetic ordering in Ni doped ZnO nanoparticles synthesized via co-precipitation

AU - Chattopadhyay, Saikat

AU - Misra, Kamakhya Prakash

AU - Agarwala, Arunava

AU - Shahee, Aga

AU - Jain, Sukriti

AU - Halder, Nilanjan

AU - Rao, Ashok

AU - Babu, P. D.

AU - Saran, Mukesh

AU - Mukhopadhyay, Anoop Kumar

PY - 2019/12/1

Y1 - 2019/12/1

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AB - To the best of our knowledge, the present work is the first ever report on how the Ni dopant concentration affects the dislocation density, band gap and most importantly the diamagnetic to ferromagnetic transition in ZnO nanoparticles (NPs), well known for multifunctional applications. For this purpose, undoped and Ni doped (1, 3, 5, and 7 at. wt.%) Wurtzite phase ZnO nanoparticles (NPs in size range 13–34 nm) are synthesized by sol-gel co-precipitation technique. As a function of the dopant concentrations (c), the polycrystalline NPs are characterized by XRD, Williamson-Hall plot, Rietveld refinement, UV–Vis spectroscopy, band-gap evaluation, dislocation density estimation, photoluminescence (PL) spectra, scanning electron microscopy (SEM),vibrating sample magnetometer (VSM) based magnetic moment (M) versus magnetic field (H) measurement, magnetic hysteresis measurement and resistivity (ρ) measurement. The results confirm that the dislocations density (δ(hkl)) along the (002) peak of XRD pattern governs the band gap energy (Eg) estimated from the corresponding Tauc's plot. Further, both δ(hkl) and Eg exhibit interesting empirical dependencies on c. The PL spectra of all the NPs show the blue emission due to Zn interstitials. The SEM based photomicrographs prove the presence of the elongated spherical i.e, elliptical sub-structures forming a chain-like distribution in the microstructures which are sensitive to c. Further, the M-H loop reveal a transition from diamagnetic to ferromagnetic behavior as the presence of Ni in ZnO matrix enhances. A similar behavior is exhibited by ρ. These results are finally summarized in terms of structure-property correlations. The implications of the present materials in terms of possible futuristic applications are also discussed.

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