• T K Gundu Rao

      Articles written in Bulletin of Materials Science

    • Luminescent studies of impurity doped SrS phosphors

      Vijay Singh Manoj Tiwari T K Gundu Rao S J Dhoble

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      SrS phosphors activated with Ce and Dy ions were prepared by solid-state diffusion method. Photoluminescent study was carried out on SrS : Ce, SrS : Dy and SrS : Dy, Ce. Thermoluminescence and electron spin resonance studies were also carried out on SrS : Dy phosphor. The thermoluminescence glow curve shows a peak at around 142°C. Irradiated SrS : Dy exhibits an ESR line due to a defect centre. Thermal annealing behaviour indicates that this centre correlates with the TL peak at 142°C. The centre is characterized by an isotropic g-value of 2.0039 and is assigned to a 𝐹+ centre.

    • Role of particle size in visible light photocatalysis of Congo Red using TiO2.[ZnFe2O4]𝑥 nanocomposites

      Himanshu Narayan Hailemichael Alemu Lebohang Macheli Mantoa Sekota Madhavi Thakurdesai T K Gundu Rao

      More Details Abstract Fulltext PDF

      TiO2.[ZnFe2O4]𝑥 (𝑥 = 0.0–0.5) nanocomposites (NCs) with an average particle size of 72.4 nm were synthesized by the method of co-precipitation/hydrolysis (CPH). For the comparison of particle-size dependent effects, a set of polycrystalline samples with similar compositions was also prepared by solid state reaction (SSR) route. Average particle size for SSR prepared samples was about 3.0 𝜇m. All the samples were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), particle size analyzer, Raman spectroscopy and Fourier transform infra-red (FTIR) spectroscopy. Their visible light photocatalytic activity was tested for the degradation of Congo Red dye. Maximum photodegradation was observed for the NC with 𝑥 = 0.1 synthesized by CPH (particle size, 71 nm). Similar composition prepared by SSR method (particle size, 6.19 𝜇m) showed lower photoactivity in comparison even with that observed for pure TiO2 (particle size, 4.03 𝜇m). It was, therefore, concluded that enhanced photodegradation is directly related to the reduced particle size of the composites, which implies that photosensitization is the process primarily involved. Although, doping of TiO2 with ZnFe2O4 does extend the cut-off wavelength towards visible parts of the spectrum, its contribution in the enhancement is not as significant as that due to the photosensitization.

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      Posted on October 12, 2020

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

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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