About Me |
|---|
Dr. Dojalisa Sahu completed her M.Sc. and M. Phil. degrees from Sambalpur University and joined CSIR-IMMT Bhubaneswar thereafter as a research assistant to pursue a career in research. In this institute, she worked under different mega projects and has a number of publications in international journals of high repute. For her Ph.D, she worked on functional metal oxide nanomaterials with suitable doping to study the structural-optical properties for possible applications and got the degree from Sambalpur University in 2014. She has also acquired MBA degree(HR,IT) in her credit. Dr. Sahu joined as an Assistant professor in the Department of Chemistry, School of Applied Sciences, Centurion University of Technology and Management, Bhubaneswar and presently continues as an Associate Professor. She was also serving as the head of the department of Chemistry and academic co-coordinator of School of Applied Sciences. Her present research focus is on the synthesis of novel functional nanostructured materials with significance in optical properties like photoluminescence, photo-catalytic and antibacterial activity. She has more than 39 publications in international journals,15 publications in national journal, 2 book publication, 3 book chapters and more than 15 conference proceedings. She is also a reviewer of a number of international journals and members of professional bodies. She had guided 03 PhD, 38 number of M.Sc. and 3 number of M. Phil. students. Presently, two more Ph.D. students are working under her. |
- Material Chemistry
- Biopolymer film
- Photo luminescence and Photo catalyst
- Instrumental Data analysis
- Solid State Chemistry(PG)
- Inorganic chemistry(PG)
- Nuclear Chemistry(PG)
- Nanomaterial and metal oxide synthesis and characterization
- Applied Analytical Chemistry
- Applied Engineering material
- Advanced Characterization Techniques
- Industrial Chemicals
- Material Synthesis and its application
- Instrumental method of Characterization
- Semiconducting material synthesis
- Bio polymeric film preparation
- Photo catalytic material preparation and their biological activity study
- Polymeric metal oxide nanocomposite film
Research Fields
Her present research focus is on the synthesis of novel functional nanomaterials with significance in structural and optical properties like photoluminescence, photo-catalytic and anti-bacterial activity. She has more than 39 publications in international journal, 15 publications in national journal and more than 15 conference proceedings. She is also a reviewer of number of international journals and members of professional bodies like Plasma Science and Society India, Orisha Chemical Society. She had guided 38 M.Sc., 3 M. Phil. students and three PhD students . She has also published three book chapters.
Recent Publications (International Journals)
| Sl. No. | Title | Issuer |
|---|---|---|
| 1 | Distinguished Achiever Award | CUTM,ODISHA |
| 2 | Faculty incentive award | CUTM Odisha |
Academic Honors & Awards
Effect of Zn concentration on microstructural, optical and hyperfine properties of nanocrystalline ?-Fe2O3
Efforts have been made to prepare nanocomposites of a-Fe2O3-ZnO by wet chemical route with varying
concentrations of the precursors. The microstructural properties of the samples are investigated by powder X-ray diffractometry
(PXRD) and Transmission electron microscopy. Initial concentration of Zn ions (up to 20 at%) leads to the
formation of nanocomposites of a-Fe2O3 and ZnO. Evolution of ZnFe2O4 phase is detected by the substitution of higher
concentration of Zn2? (30 at%) in the sample. The average size of the nanoparticles remains in the range of 22–27 nm as
obtained from XRD data. The results obtained from electron microscopic studies are also close to these values. Photoluminescence
measurement shows the excitonic peak of ZnO around 390 nm which gets strengthened with Zn addition.
FTIR spectra show the metal–oxygen band below 700 cm-1. Room temperature Mo¨ssbauer studies of the samples show
the transition of iron oxide form antiferromagnetic state to paramagnetic state with increasing concentration of Zn2?. Sharp
quenching of hyperfine field with Zn concentration is observed as the Hint value reduced to zero from 51 T.
Enhanced UV absorbance and photoluminescence properties of ultrasound assisted synthesized gold doped ZnO nanorods.
Au doped ZnO (ZnO:Au) nanostructures were synthesized by ultrasound assisted wet chemical method.
The concentration of dopant was varied and both structural and optical properties of ZnO:Au were investigated.
The crystal structure and morphology of the samples were examined by X-ray diffraction (XRD)
and transmission electron microscopy (TEM). These results showed the formation of nanorods of ZnO:Au
having wurtzite structure and c-axis orientation. Gradual increase in crystallite size and bond length was
also observed with the increase in gold concentration in ZnO intending the expansion of lattice after gold
doping. The optical absorption measurements showed high ultraviolet (UV) absorbance property of
ZnO:Au with sharp and intense absorption band in this region as compared to pristine ZnO. Photoluminescence
(PL) measurements showed excitonic emission band of ZnO around 390 nm for both undoped
and Au doped ZnO nanoparticles. Further, a strong emission around 467 nm was observed in the PL spectra
of ZnO/ZnO:Au which was attributed to the transitions related to excess of oxygen vacancies. Interestingly,
a new band was observed at 582 nm for doped ZnO samples which grew in intensity with
doping concentration. This band was ascribed to the gold nanoparticle adsorbed on the surface of ZnO.
Microstructural and optical investigations on sonochemically synthesized Cu doped ZnO nanobricks.
Copper doped ZnO (ZnO:Cu) nanoparticles were synthesized by sonochemical method varying the doping concentration. Copper nitrate was
taken as the dopant source and its concentration was varied as 0.001, 0.002 and 0.003 M and added to 0.2 M zinc nitrate to prepare ZnO:Cu
nanoparticles. Systematic investigations like X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Transmission electron
microscopy (TEM) were carried out to understand the microstructural properties. XRD result revealed the formation of wurtzite phase of ZnO
with average crystallite size in the range of 23–57 nm. Further, an increase in the crystallite size of ZnO:Cu was observed with the increase in
doping concentration. The result obtained from XRD was also supported by the results obtained from electron microscopic measurements.
Moreover, formation of brick like nanostructures of ZnO:Cu was observed from the images obtained from these studies. X-ray photo-electron
spectroscopic (XPS) studies showed the presence of Cu2p levels in the spectra. This confirmed the divalent state of Cu ions in ZnO. UV
absorption spectra revealed the absorption wavelength around 370 nm with a remarkable red shift of absorption band with the increase in doping
concentration. But, the Fourier transform infrared (FTIR) spectroscopy showed a linear decrease in transmittance of IR light with increasing Cu
content in ZnO. Photo-luminescence (PL) spectra recorded at two excitation wavelengths such as; 293 and 354 nm showed prominent emission
bands in the UV and visible regions among which the blue emission is dominant.
Photoluminescence and photocatalytic properties of europium doped ZnO nanoparticles
The present study describes the effect of europium doping in enhancing the optical properties of ZnO nanoparticles.
Eu doped ZnO (EZ) nanoparticles were prepared by the soft-solution method with varying the dopant
concentration. The structure and phase analysis have been carried out by x-ray diffraction (XRD) measurement
which shows the size of the particles lies in 30–60 nm range. Improved crystallinity in ZnO is also observed along
with lower angle shift of XRD peaks and increase in lattice parameters like unit cell volume which may be
explained as the substitutional effect of Eu at Zn sites. Microstructure of the sample has been studied by
transmission electron microscopy (TEM) and the images show the average size of EZ nanoparticles is in the range
of 30–50 nm. Both XRD and TEM studies give the evidence of Eu incorporation in ZnO lattice. The EZ nanoparticles
exhibit intense red emission upon excitation of 400 nm light which are characteristic 4f-intra-shell
(5D0-7F2) transitions of Eu3+ other than the defect emissions of host ZnO. The dopant ions are located in ZnO by
substituting Zn2+ at a low-symmetry site (C3v) and also near the surface in some distorted lattice sites. The
photocatalytic activity has been evaluated by degradation of hazardous methyl orange (MO) dye with exposure
to UV light. Among the tested samples, the sample with optimal doping concentration shows notable photocatalytic
activity and achieved 90% degradation of MO dye within 180 min of UV irradiation. This photocatalytic
activity of EZ has been found to be better as compared to that of ZnO in identical experimental conditions.
Effect of Gd doping on structure and photoluminescence properties of ZnO nanocrystals
Gd doped ZnO nanoparticles with varying dopant concentration are synthesized by simple wet
chemical method. X-ray diffraction measurements confirm that the prepared samples are of
hexagonal wurtzite structure with grain size around 50–60 nm. Gd doping induces lattice expansion
in ZnO as the average crystallite size increases with the evolution of Gd2O3 phase after Gd doping.
Electron microscopic studies show the presence of two types of particle distribution belonging to
ZnO and Gd2O3 phases with an average size of 55 nm where the later surrounds the surface of ZnO.
UV–VIS spectra show red-shift of absorption band of ZnO with Gd doping. A suppression of band
edge UV emission and intensification of visible emission is observed in the photoluminescence
spectra of doped ZnO. This has been explained on the basis of incorporation of impurity levels by the
dopant along with intrinsic defect such as oxygen vacancies in the band gap of ZnO
Synthesis, spectral characterization and antibacterial evaluation of 14-memebered tetra-aza-N4 macrocyclic complex
Effect of Lanthanum doping on the optical and antibacterial properties of ZnO nanoparticlesÂ
Structural and antibacterial study of Ag doped ZnO nanoparticles synthesized by ultrasonication
Study on crystallographic and electronic band structure of wurtzite ZnO
Study on the electronic band structure and optical property of semiconducting TiO2 nanoparticles
In silico Study of band gap modulation for SnO2 systems
Novel Structural and Optical Properties of Eu doped ZnONanoparticles Prepared by Chemical Co-Precipitation Method
Synthesis of Cerium doped Zinc oxide nanoparticles by aqueous precipitation method and study on the structural and optical properties
Evalution of antibacterial activity ,biodegradability and mechanical properties of chitosan blended Biofilm for food packaging application
Production of hydrogen gas from methanol using dielectric barrier discharge plasma method
A Review on Tin Oxide Based Nanocomposites: Synthesis and Applications
Sol-Gel growth of SnO2 nanostructures and study on the structural and photocatalytic properties
Sm3+ driven enhancement in photocatalytic degradation of hazardous dyes and photoluminescence properties of hexagonal-ZnO nanocolumns
Application of Ultrasound for the Synthesis of Metal Oxide Nanomaterials with Novel Morphology
Nanoscience and Nanotechnology for Multifunctional Applications : (Technology for Future Smart and Modern World)-Book Chapter