Magnetodielectric effect in composites of nanodimensional glass and CuO nanoparticles

Saha, Dhriti Ranjan; Mukherjee, M.; Chakravorty, D.

doi:10.1016/j.jmmm.2012.07.021

Cited by 8 publications

(1 citation statement)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7 The latter property was also reported in the case of composites of nanodimensional glass and CuO nanoparticles. 8 It has been shown earlier that semiconducting behaviour in oxide glasses arises due to the presence of transition metal ions in two valence states. [9][10][11] The electrical property of nanosilica glasses with semiconducting characteristics has not been reported earlier.…”

mentioning

confidence: 99%

Enhancement of electrical conductivity in CoO-SiO2 nanoglasses and large magnetodielectric effect in ZnO-nanoglass composites

Chatterjee

Maiti

Saha

et al. 2015

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

Articles you may be interested inSuperior magnetic, dielectric, and magnetodielectric effects in graphene/ZnCo2O4 nanocomposites Nanoglasses of compositions xCoOÁ(100-x)SiO 2 (mol. %) with x having values 10, 15, and 20, respectively, were grown within the nanopores of a pellet comprising of ZnO nanoparticles by soaking the latter in a suitable sol followed by necessary heat treatment. Both Co 2þ and Co 3þ ions were present and confirmed by X-ray photoelectron spectroscopy, the fraction of Co 2þ species being $ 0.70. Small polaron hopping conduction was found to be present in the nanoglasses. The activation energy in the latter was observed to be smaller (range of 0.32-0.44 eV) than that in the corresponding bulk glass (0.70-0.77 eV). This was caused by the higher free volume in the nanoglass as compared to that of the bulk glass. This was confirmed by the extracted values of intersite separation between cobalt ions, which were higher in the nanoglass. Weak ferromagnetism was exhibited by the nanocomposites. This was ascribed to super exchange interaction between spin moments associated with Co 2þ and Co 3þ ions, respectively, leading to an antiferromagnetic spin alignment. The nanocomposites showed magnetodielectric effect with the magnetodielectric parameter having values in the range of 5.5% to 10%. The experimental data were fitted to equations derived from Catalan's model by invoking a negative and a positive magnetoresistance for nanoglasses of compositions having x ¼ 20 and x ¼ 10, respectively. A weak spin-orbit coupling and wave function shrinkage in a magnetic field for strongly localized states, respectively, are believed to cause such behaviour in the nanoglass systems concerned. Direct magnetoresistance measurements were carried out on the nanocomposites containing nanoglasses having 10CoO and 20CoO, respectively. The trend of results obtained indeed confirmed the presence of positive and negative magnetoresistance in the two nanoglasses, respectively. The materials would be suitable for magnetic sensor applications. V C 2015 AIP Publishing LLC.

show abstract

mentioning

confidence: 99%

Enhancement of electrical conductivity in CoO-SiO2 nanoglasses and large magnetodielectric effect in ZnO-nanoglass composites

Chatterjee

Maiti

Saha

et al. 2015

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

show abstract

Sonochemical synthesis of CuO nanostructures and their morphology dependent optical and visible light driven photocatalytic properties

Pandiyarajan

Saravanan

Karthikeyan

et al. 2016

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

A controlled synthesis of CuO nanostructures with various morphologies were successfully achieved by presence/absence of low frequency (42 kHz) ultrasound with two different methods. The size, shape and morphology of the CuO nanostructures were tailored by altering the ultrasound, mode of addition and solvent medium. The crystalline structure and molecular vibrational modes of the prepared nanostructures were analysed through X-ray diffraction and FTIR measurement, respectively which confirmed that the nanostructures were phase pure high-quality CuO with monoclinic crystal structure. The morphological evaluation and elemental composition analysis were done using TEM and EDS attached with SEM, respectively. Furthermore, we demonstrated that the prepared CuO nanostructures could be served as an effective photocatalyst towards the degradation of methyl orange (MO) under visible light irradiation. Among the various nanostructures, the spherical shape CuO nanostructures were found to have the better catalytic activities towards MO dye degradation. The catalytic degradation performance of MO in the presence of CuO nanostructures showed the following order: spherical \ nanorod \ layered oval \ nanoleaf \ triangular \ shuttles structures. The influence of loading and reusability of catalyst revealed that the efficiency of visible light assisted degradation of MO was effectively enhanced and more than 95 % of degradation was achieved after 3 cycles.

show abstract

Glass-Based Nanocomposites

Chatterjee

Saha

Chakravorty

2016

Glass Nanocomposites

View full text Add to dashboard Cite

Magnetodielectric effect in composites of nanodimensional glass and CuO nanoparticles

Cited by 8 publications

References 32 publications

Enhancement of electrical conductivity in CoO-SiO2 nanoglasses and large magnetodielectric effect in ZnO-nanoglass composites

Enhancement of electrical conductivity in CoO-SiO2 nanoglasses and large magnetodielectric effect in ZnO-nanoglass composites

Sonochemical synthesis of CuO nanostructures and their morphology dependent optical and visible light driven photocatalytic properties

Glass-Based Nanocomposites

Contact Info

Product

Resources

About