• Balwinder Kaur

Articles written in Bulletin of Materials Science

• High resolution X-ray diffraction studies on unirradiated and irradiated strontium hexaferrite crystals

High-resolution X-ray diffraction technique, employing a three-crystal monochromator–collimator combination is used to study the irradiation induced defects in flux grown Sr-hexaferrite crystals irradiated with 50 MeV Li3+ ion beams at room temperature with a fluence value of 1 × 1014 ions/cm2. The diffraction curves of the irradiated crystals suggest the possibility of creation of low angle grain boundaries and other point/clusters of defects causing amorphization in the irradiated crystals. The perfection of the irradiated and unirradiated (0001) cleaved surfaces of the crystals is studied using the bulk method of X-ray topography. The topographs supplement the findings suggestive of modifications in the crystalline quality of SrFe12O19 on irradiation with SHI of Li3+. Etching of the (0001) cleaved surfaces in H3PO4 at 120°C suggests that the dissolution characteristics of the surfaces get affected on irradiation with SHI of Li3+, besides supporting the findings of HRXRD and X-ray topography regarding modifications in the perfection of SrFe12O19 on irradiation.

• Detoxification of dye contaminated water by Mn$^{2+}$-doped ZnS nanostructures

Chemical co-precipitation route was successfully employed to synthesize polyethylene glycol-coated pure and doped Zn$_{1−x}$Mn$_x$S (0 ≤ x ≤ 0.1) nanoparticles. The crystallographic and morphological analyses have been done by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The formation of cubic crystal structure and quasi-spherical morphology has been revealed by XRD and TEM, respectively. The optical analyses have been done by UV–Vis absorption spectroscopy and energy resolved photoluminescence spectroscopy. Energy dispersive X-ray spectroscopy study has been carried to analyse the elemental composition. The doping concentration dependent photo-catalytic activity was checked to analyse the photo-catalytic potential of Zn$_{1−x}$Mn$_x$S nanoparticles under UV irradiation.

• Study of precursor-dependent CuS nanostructures: crystallographic, morphological, optical and photocatalytic activity

Diethylenetriamine (DETA)-assisted solvothermal method is explored for the synthesis of CuS nanostructures (NSs). Cu(ethylxanthate)$_2$, Cu(morpholine-4-dithiocarbamate)$_2$ and Cu(piperazine-1-dithiocarbamate)$_2$ are used as efficient single source precursors for the synthesis of CuS NSs. DETA acts as stabilizing as well as reducing agent. Diffraction and electron microscopy techniques are used for the analyses of crystallographic and morphological features of the synthesized NSs. Synthesized NSs crystalize in hexagonal crystal structure, having average crystallite size ${\sim}$28.95, 32.85 and 33.30 nm for CuS prepared from Cu(ethylxanthate)$_2$, Cu(morpholine-4-dithiocarbamate)$_2$ and Cu(piperazine-1-dithiocarbamate)$_2$ precursors, respectively. Transmission electron microscope analysis shows the formation of multifaceted NSs. Topographical studies carried out with the help of field-emission scanning electron microscope reveal the agglomeration of layered NSs. Photocatalytic activity of synthesized CuS NSs is assessed by evaluating the degradation of methylene-blue dye aqueous solution under visible light irradiation. Photocatalytic activity dependence on morphology is thoroughly studied.

• # Bulletin of Materials Science

Volume 45, 2022
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020