Effect of Co substitution on the structural and optical properties of ZnO nanoparticles synthesized by sol–gel route

Arshad, Mohd Khairuddin; Azam, Ameer; Ahmed, Arham S.; Mollah, S.; Naqvi, Andleeb Z.

doi:10.1016/j.jallcom.2011.05.047

Cited by 185 publications

(41 citation statements)

References 48 publications

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“…Furthermore, bands at 1632 cm −1 are attributed to the angular deformation of H 2 O and bands around 3436 cm −1 show the O-H stretching of H 2 O. These findings are in accordance with the available literature [20,21]. A clear confirmation of hollow structure was done by TEM characterization (Figure 4).…”

Section: Resultssupporting

confidence: 90%

Synthesis and Characterization of Nontoxic Hollow Iron Oxide (α-Fe2O

Riasat

Nie

2016

Journal of Nanomaterials

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Hollow spheres of iron oxide ( -Fe2O 3 ) were successfully synthesized in a simple one-pot synthesis by using hydrothermal method. Iron salt was dissolved together with glucose in water and then the mixture was heated to 180 ∘ C in an autoclave at 12 and 24 hours of synthesis time separately. Carbon spheres were formed with the metal ions into their hydrophilic shell after the hydrothermal approach. Hollow -Fe 2 O 3 spheres of around 200 to 300 nm size were formed after the calcination that lead to the removal of carbon. Size of nanoparticles, surface area, and thickness of the -Fe 2 O 3 shell can be precisely controlled by controlling the ratio of iron and glucose. Increasing the reaction time will decrease the shell thickness. Phase confirmation and crystalline structure of these nanoparticles were done by XRD. Surface morphology was characterized by SEM and TEM analysis showed the hollow spheres inside and a shell of -Fe 2 O 3 . Further confirmation was done by EDX and FTIR analysis. Iron content was measured by ICP-OES. Cytotoxicity was done by using CCK-8 assay kit in the Hep G-2 cell line showing the nontoxic behavior of -Fe 2 O 3 nanoparticles. The as-prepared nanoparticles can be exploited in a number of applications in areas ranging from medicine to pharmaceutics to material science.

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Section: Resultssupporting

confidence: 90%

Synthesis and Characterization of Nontoxic Hollow Iron Oxide (α-Fe2O

Riasat

Nie

2016

Journal of Nanomaterials

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“…Previous work reported on a study of the oxygen sensing properties of Cr doped (1 at.%) and undoped ZnO [15] fabricated by reactive RF co-sputtering. The reduced particle size and lattice constants have been described by Arshad et al [16] with the increase of Cu concentration in the ZnO nanoparticles. Tuning of photo-catalytic activity, gas sensitivity, room temperature ferromagnetism, etc.…”

Section: Introductionmentioning

confidence: 77%

“…Even though some of the research works have been carried out on Cu or Cr doped ZnO system separately [11,13,[16][17][18][19], comprehensive study of the structural and optical properties of Cu and Mn co-doped ZnO nanocrystals is still scanty. Therefore, in present investigation, Zn 0.94 Cu 0.04 Cr 0.02 O nanocrystals were synthesized by using co-precipitation method.…”

Section: Introductionmentioning

confidence: 99%

Band gap tailoring and enhanced visible emission by two-step annealing in Zn0.94Cu0.04Cr0.02O nanocrystals

Sangeetha

Muthukumaran²

2015

J Mater Sci: Mater Electron

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Zn 0.94 Cu 0.04 Cr 0.02 O nanocrystals were synthesized by co-precipitation method and the effects of annealing at 600°C and 800°C under two steps on the structural, optical and morphological properties were investigated systematically. X-ray diffraction pattern showed the secondary phases such as CuO and ZnCr 2 O 4 were found at 600 ? 800°C annealed sample. In addition, I (002) /I (100) ratio became almost equal to 1 at 600 ? 800°C which described the grains with lower surface energy became larger. Chemical composition of the samples was confirmed by energy dispersive X-ray spectra. The variation of absorption peaks between 473 and 556 cm -1 and the shift of absorption frequency towards the lower side by annealing revealed that Zn-O-Zn network is perturbed by the presence of Cu/Cr in its environment. Absorption intensity and blue shift of energy gap were discussed based on size, defects and secondary phase formation. The broad transmittance spectra noticed around visible region illustrated the presence of oxygen related defects and Cu/Cr interstitials. I green /I blue ratio is increased with increase in annealing temperature. The noticed high value of this ratio at 800°C confirmed the existence more defect related states.

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“…This band gap engineering through transition metal doping firmly empowers the investigation of the magneto-optical properties of the transition metal-doped ZnO system. This may prompt the advancement of the novel magneto-optical devices [21].…”

Section: Introductionmentioning

confidence: 99%

Investigations on absorption, photoluminescence and magnetic properties of ZnO: Co nanoparticles

Kumar

Pandey

2016

J Sol-Gel Sci Technol

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We have investigated the consequences of cobalt (Co) incorporation with different doping concentrations (0, 2, 4 and 6 %) on structural, optical and magnetic properties of ZnO nanoparticles. The results of X-ray diffraction spectra (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) pattern of single particle, energydispersive X-ray spectroscopy (EDS) and Fourier transform infrared (FT-IR) authenticate the substitution of cobalt and hexagonal crystal structure without any secondary phase formation of all the samples under investigation. The ultravioletvisible (UV-Vis) absorption study indicates that increase in Co concentration improves the visible region absorption (550-700 nm). The absorption edge of Co-doped ZnO shifts towards visible region with increase in Co concentration. The band gap of samples shows a red shift with increase in Co percentage. The photoluminescence (PL) study of the samples indicates that Co doping shifts the intense peak position of ZnO from violet to blue colour. The weak emission peak at 572 nm is also observed in all the samples. The emission is represented by chromaticity diagram. The room temperature magnetic properties have been studied using vibrating sample magnetometer (VSM). The room temperature magnetisation curve shows that an increase in Co concentration increases the linear behaviour of M-H loop. The magnetic susceptibility results indicate that all the samples have Curie-Weiss behaviour. The coercive field (H c ) and the remanence magnetisation (M r ) increase with Co doping concentration. Graphical Abstract Fig. M-H curve of pure and cobaltdoped ZnO nanoparticles at 300 K. Inset (a) shows absorption spectra, and inset (b) shows the emission spectra of Zn 1-x Co x O nanoparticles.

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Effect of Co substitution on the structural and optical properties of ZnO nanoparticles synthesized by sol–gel route

Cited by 185 publications

References 48 publications

Synthesis and Characterization of Nontoxic Hollow Iron Oxide (α-Fe2O

Synthesis and Characterization of Nontoxic Hollow Iron Oxide (α-Fe2O

Band gap tailoring and enhanced visible emission by two-step annealing in Zn0.94Cu0.04Cr0.02O nanocrystals

Investigations on absorption, photoluminescence and magnetic properties of ZnO: Co nanoparticles

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