Browsing by Author "Suchitra, S.M."

Filter results by typing the first few letters
Now showing 1 - 6 of 6
  • No Thumbnail Available
    Item
    Effect of pore widening time on the structural aspects of self-organized nanopore arrays formed by anodization of aluminum in chromic acid
    (2016) Suchitra, S.M.; Ramana, Reddy, P.; Udayashankar, N.K.
    Anodic aluminium oxide (AAO) membranes were prepared by two-step anodization of aluminum formed in 0.3M chromic acid at the ambient temperature of ~ 30� C with anodization potential of 50 V. The radial average fast Fourier transform based study of nanopores has been carried out. The duration of the pore widening was varied from 0min to 60min in steps of 15 minutes. The effect of the pore widening time on the structural parameters of porous anodic alumina such as pore diameter (Dp), interpore distance (Dc), porosity (P) and pore density (n) were studied. It was observed that pore diameter and porosity increased with increasing pore widening time. Highly ordered and better nanopore array of AAO membrane was obtained for the sample anodized in chromic acid with 60 min pore widening time. � 2016 Elsevier Ltd.
  • No Thumbnail Available
    Item
    Effect of pore widening time on the structural aspects of self-organized nanopore arrays formed by anodization of aluminum in chromic acid
    (Elsevier Ltd, 2016) Suchitra, S.M.; Ramana Reddy, P.; Udayashankar, N.K.
    Anodic aluminium oxide (AAO) membranes were prepared by two-step anodization of aluminum formed in 0.3M chromic acid at the ambient temperature of ~ 30° C with anodization potential of 50 V. The radial average fast Fourier transform based study of nanopores has been carried out. The duration of the pore widening was varied from 0min to 60min in steps of 15 minutes. The effect of the pore widening time on the structural parameters of porous anodic alumina such as pore diameter (Dp), interpore distance (Dc), porosity (P) and pore density (n) were studied. It was observed that pore diameter and porosity increased with increasing pore widening time. Highly ordered and better nanopore array of AAO membrane was obtained for the sample anodized in chromic acid with 60 min pore widening time. © 2016 Elsevier Ltd.
  • No Thumbnail Available
    Item
    Influence of porewidening duration on the template assisted growth of graphitic carbon nitride nanostructures
    (Institute of Physics Publishing helen.craven@iop.org, 2018) Suchitra, S.M.; Udayashankar, N.K.
    Porous anodic aluminium oxide (AAO) membranes with a highly ordered pore arrangement are typically used as ideal templates for the synthesis of numerous nanostructured materials. Highly ordered templates gained significant attraction due to the fact that they are readily fabricated through self-organised simple anodization process. In this paper, the effect of different pore-widening treatments on the quality of the pores of the AAO templates prepared with different electrolytes were inspected. Results confirmed that, without altering the interpore distance different pore dimensions and diameters of the AAO templates can be easily achieved by chemical pore widening process at room temperature. Also, graphitic carbon nitride nanorods of different dimension have been fabricated from AAO template after porewidening process. These nanostructures are widely used in case of metal free visible light driven photo catalysis, photo degradation of organic pollutants, photo electric conversion and water splitting applications. © 2018 IOP Publishing Ltd.
  • No Thumbnail Available
    Item
    Structural and wetting properties of porous anodic alumina templates prepared by different electrolytes
    (2016) Suchitra, S.M.; Ramana, Reddy, P.; Udayashankar, N.K.
    Porous anodic alumina (PAA) has been extensively studied in recent years due to their unique properties and applications for manufacturing nanostructured materials. In this article, we report our studies on structural and wetting properties of PAA membranes prepared using different electrolytes such as sulphuric, oxalic and phosphoric acids. The morphological parameters such as pore diameter and porosity were measured using SEM and analysed using image-J software. The structural investigation of PAA membranes was carried out through X-ray diffraction analysis and it was confirmed that PAA membranes were amorphous in nature. The wetting behaviour of PAA membranes were measured using contact angle measurement technique. The results show that PAA membranes were hydrophilic in nature with contact angles 26.03�, 35.21� and 42.0� for sulphuric, oxalic and phosphoric acids respectively. � 2016 Author(s).
  • No Thumbnail Available
    Item
    Structural and wetting properties of porous anodic alumina templates prepared by different electrolytes
    (American Institute of Physics Inc. subs@aip.org, 2016) Suchitra, S.M.; Ramana Reddy, P.R.; Udayashankar, N.K.
    Porous anodic alumina (PAA) has been extensively studied in recent years due to their unique properties and applications for manufacturing nanostructured materials. In this article, we report our studies on structural and wetting properties of PAA membranes prepared using different electrolytes such as sulphuric, oxalic and phosphoric acids. The morphological parameters such as pore diameter and porosity were measured using SEM and analysed using image-J software. The structural investigation of PAA membranes was carried out through X-ray diffraction analysis and it was confirmed that PAA membranes were amorphous in nature. The wetting behaviour of PAA membranes were measured using contact angle measurement technique. The results show that PAA membranes were hydrophilic in nature with contact angles 26.03°, 35.21° and 42.0° for sulphuric, oxalic and phosphoric acids respectively. © 2016 Author(s).
  • No Thumbnail Available
    Item
    Synthesis and photocatalytic properties of graphitic carbon nitride nanofibers using porous anodic alumina templates
    (Institute of Physics Publishing helen.craven@iop.org, 2017) Suchitra, S.M.; Udayashankar, N.K.
    In the present study, we describe an effective method for the synthesis of Graphitic carbon nitride (GCN) nanostructures using porous anodic alumina (AAO) membrane as template by simple thermal condensation of cyanamide. Synthesized nanostructure was fully analysed by various techniques to detect its crystalline nature, morphology, luminescent properties followed by the evaluation of its photocatalytic activity in the degradation of Methylene blue dye. Structural analysis of synthesized GCNNF was systematically carried out using x-ray powder diffraction (XRD) and scanning electron microscope (SEM), and. The results confirmed the growth of GCN inside the nanochannels of anodic alumina templates. Luminescent properties of GCNNF were studied using photoluminescence (PL) spectroscopy. PL analysis showed the presence of a strong emission peak in the wavelength range of 350-600 nm in blue region. GCNNF displays higher photocatalytic performance in the photodegradation of methylene blue compare to the bulk GCN. Highlights 1. In the present paper, we report the synthesis of graphitic carbon nitride nanofibers (GCNNF) using porous anodic aluminium oxide membranes as templates through thermal condensation of cyanamide at 500 °C. 2. The synthesis of Graphitic carbon nitride nanofibers using porous andic alumina template is the efficient approach for increasing crystallinity and surface area. 3. The high surface area of graphitic carbon nitride nanofibers has a good impact on novel optical and photocatalytic properties of the bulkGCN. 4. AAO templating of GCN is one of the versatile method to produce tailorable GCN nanostructures with higher surface area and less number of structural defects. 5. Towards photocatalytic degradation of dyes, the tuning of physical properties is very essential thing hence we are succeeded in achieving better catalytic performance of GCN nanostructures by making use of AAO templates. © 2017 IOP Publishing Ltd.