Biennial Report 2005-2007 - Saha Institute of Nuclear Physics

148 Biennial Report 2005-07Fig.5.1.1.9. (a) Line profiles of the conductance current of the lines marked A andB, respectively, in the inset. Inset: conductance map showing top layer having highconductance, the intermediate step showing intermediate conductance and the lowestlayer showing lowest conductance. Bright current streaks appearing on certain edgesare shown by an arrow. (b) Conductance map of a single ribbon edge containing twotypes of edges labeled A (armchair) and Z (Zigzag).It has also been observed that zig-zag edges show sharp rise in current than the arm-chair edgesindicating enhanced electronic density of states at the Fermi energy of the zig-zag edges than thearm-chair edges.S Banerjee, N Gayathri†, S Dash†, AK Tyagi†, Baldev Raj†SP5.1.1.10 Physics and chemistry of photocatalytic titanium dioxide: Visualization ofbactericidal activity using atomic force microscopy (AFM)When titanium dioxide (TiO 2 ) is exposed to near ultraviolet light, it exhibits strong bactericidalactivity. Anatase phase of TiO 2 film was prepared by anodizing pure titanium coupons (substrate).With the formation of a thin film of TiO 2 , we observed strong bactericidal activity.