Effect of Co doping on optical behaviors in ZnO nanorods

Ghosh, Avijit; Karak, N.; Kundu, Tapanendu

doi:10.1063/1.4810158

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…Similar redshift in PL emission in ZnO NPs has been reported earlier by Sendi and Mahmud [55]. A strong redshift in UV PL spectra of cobalt-doped ZnO nanorods was also observed by Ghosh et al [56].…”

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confidence: 88%

Doping Efficiency in Cobalt-Doped ZnO Nanostructured Materials

Kaphle

Reed

Apblett

et al. 2019

Journal of Nanomaterials

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Nanostructured ZnO thin films doped with cobalt from 5% to 20% were grown on glass substrates by a low-temperature chemical bath deposition (CBD) technique. We compared the doping efficiency of incorporating cobalt in ZnO nanostructured samples doped with cobalt via cobalt nitrate and cobalt chloride. The concentration of cobalt incorporated into the ZnO matrix was precisely determined using inductively coupled plasma mass spectroscopy (ICP-MS). Scanning electron microscopy (SEM) images showed that only at a 0.1 M ratio of the precursor solutions in CBD using cobalt nitrate as a dopant, the morphology of ZnO yielded hexagonally shaped nanorods. At a 1 M ratio of the precursor solutions, SEM images showed that the morphology of ZnO was nanoplatelets at all doping levels, irrespective of the doping method used. The synthesized nanostructures retained the wurtzite hexagonal structure only at 0.1 M precursor solution using cobalt nitrate doping, which was confirmed by X-ray diffraction (XRD) studies. In cobalt-doped samples using cobalt chloride as a dopant, XRD analysis confirmed the formation of a Simonkolleite structure. At 300°C, the Simonkolleite structure was converted to a wurtzite structure without changing the morphology. Electrical conductivity measurements at 300 K showed that ZnO nanorods doped with cobalt using cobalt nitrate yielded the lowest resistivity. The molarity of the precursor solution and dopant was found to have a substantial impact on the morphology and doping efficiency of the ZnO nanostructures.

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supporting

confidence: 88%

Doping Efficiency in Cobalt-Doped ZnO Nanostructured Materials

Kaphle

Reed

Apblett

et al. 2019

Journal of Nanomaterials

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“…This degradation corresponds to a breakdown of the thermostable aromatic rings present in the polymer structure. These thermal data indicate that the poly(t‐CNSL) is thermally stable and can safely be used when the temperature reaches 150°C 28,37,56–59 …”

Section: Resultsmentioning

confidence: 88%

“…In recent years, t‐CNSL has been used as precursors of coatings for the corrosion protection of metallic alloys 36 . Ghosh and Karak 37 reported the synthesis of mechanically resistant polyurethane (PU) using dimer acid‐glycerol‐modified polyol, sunflower oil monoglyceride, and CNSL (natural) as raw materials. The authors applied the PU as an anticorrosion coating.…”

Section: Introductionmentioning

confidence: 99%

Corrosion protection of stainless steel by a new and low‐cost organic coating obtained from cashew nutshell liquid

Nunes

Bandeira

Figueiredo

et al. 2022

J of Applied Polymer Sci

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In this work, the corrosion protection of 316L steel was promoted by an electro‐synthesized polymer obtained from the technical cashew nutshell liquid (t‐CNSL). Spectroscopic techniques confirmed the polymer formation. The polymer was dispersed in the ethyl acetate solvent and used to form coatings on 316L steel substrates. The coated samples were subjected to electrochemical tests in a saline environment. The coated electrode with poly(t‐CNSL) polymer was exposed to the corrosive medium for 24 days, and superior corrosion protection was observed compared with the uncoated sample. The open circuit potential measurements showed that the coated sample possessed a more positive corrosion potential when compared with the uncoated substrate. The electrochemical impedance spectroscopy results indicated that the coated electrode's polarization resistance (Rp) recorded ~1.0 MΩ cm2 after 24 days of exposure. A decrease in polarization resistance was observed with the exposure time due to the presence of micropores in the t‐CNSL coating. The polarization curves exhibited that the coated electrode with poly(t‐CNSL) has lower corrosion current density and less negative corrosion potential than the uncoated steel electrode. Therefore, t‐CNSL favors the manufacture of thin poly(t‐CNSL) coatings for corrosion protection purposes besides being a low‐cost material.

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