Pradosh K. Sahoo; G. Mangamma; M. Kamruddin; S. Dash; Ashok K. Tyagi
Abstract
In the present work ZnO dendritic nanostructures (NS) were synthesized by sol-gel and spin coating methods over silicon (100) substrate. The phase purity was confirmed by XRD. Grain size was found to be less than 10 nm. The vibrational modes of the nano ZnO wurtzite structure were observed by laser Raman ...
Read More
In the present work ZnO dendritic nanostructures (NS) were synthesized by sol-gel and spin coating methods over silicon (100) substrate. The phase purity was confirmed by XRD. Grain size was found to be less than 10 nm. The vibrational modes of the nano ZnO wurtzite structure were observed by laser Raman spectroscopy. Raman spectra revealed asymmetrically broadened red shift of E2 (high) optical phonon mode which accrues from contribution of Non-Brillouin Zone (NBZ) phonons. The shift in the peak is attributed to the quantum mechanical confinement of phonon due to their nano grains as inferred from XRD and morphological studies by Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). SEM and AFM images revealed the leaf like dendrite structures having several branches. Possible growth mechanism has been discussed in line with the synthesis. Box counting method was implemented to determine the fractal dimension (D) and the value of D is found to be ~1.6±0.1. This work will be useful in designing novel optoelectronic devices and sensors from ZnO nanostructures (NS) exhibiting complex morphology. Copyright © 2017 VBRI Press.
Susai Rajendran; R Joseph Rathish; S Santhana Prabha
Abstract
Self-assembling molecules form protective layers on metal surfaces Self assembled nanofilms of adipic acid, N-cetyl-N,N,N-trimethyl ammonium bromide, Tween- 60, Sodium dodecyl sulphate and an aqueous extract of banana peel have been formed on the surface of carbon steel ...
Read More
Self-assembling molecules form protective layers on metal surfaces Self assembled nanofilms of adipic acid, N-cetyl-N,N,N-trimethyl ammonium bromide, Tween- 60, Sodium dodecyl sulphate and an aqueous extract of banana peel have been formed on the surface of carbon steel by the immersion method. The formation of the nanofilms has been confirmed by Fourier Transform Infrared spectral study and Atomic Force Microscopy Study. The corrosion inhibitive nature of the protective film has been estimated by the classical weight loss method and electrochemical study such as polarization study. The hydrophobic nature of the protective film has been investigated by measurement of contact angles of the protective films. The hydrophobic surfaces may find application in various exciting fields such as corrosion protection, raincoats, water proof surfaces and biomaterials. Copyright © 2017 VBRI Press.
Rashmi Singh; Puneet Jain; Naresh Kumar; Pramod Kumar
Abstract
Thin films of Co2MnSi are grown on n-doped Si (100) and SiO2 (100) substrates by RF sputtering. The deposition time to grow the films is varied, once for ten minutes and another for an hour at a particular substrate temperature 600oC and keeping all the other parameters same. The Co2MnSi thin films deposited ...
Read More
Thin films of Co2MnSi are grown on n-doped Si (100) and SiO2 (100) substrates by RF sputtering. The deposition time to grow the films is varied, once for ten minutes and another for an hour at a particular substrate temperature 600oC and keeping all the other parameters same. The Co2MnSi thin films deposited on Si and SiO2 are crystalline irrespective of the deposition time. The grains were round in the thin films deposited for 10 minutes and these grains are more consistently interconnected in the films deposited for 1 hour. This is supported by the surface roughness data from AFM. The rms roughness is found to be 4.82nm for Si for 10 minutes and 2.50nm for Si for 1 hour deposition that was observed over an area of 3µm2. Copyright © 2017 VBRI Press.
