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Nano Research & Applications
ISSN 2471-9838
E u r o S c i C o n C o n f e r e n c e o n
Nanotechnology &
Smart Materials
O c t o b e r 0 4 - 0 6 , 2 0 1 8
Am s t e r d a m , N e t h e r l a n d s
Nanotechnology & Smart Materials 2018
The morphological, structural, optical and antibacterial
characteristics of Cr2O3 nanoparticles: a comprehensive study
Naif Mohammed Al Hada and Halimah Mohamed Kamari
Universiti Putra Malaysia, Malaysia
C
alcination via thermal treatment using a precursor material is employed in the generation of Cr
2
O
3
nanoparticles. Precursor
materials included chromium nitrate in addition to a capping agent of polyvinylpyrrolidone. A range of analytical techniques:
X-ray diffraction (XRD); energy dispersive X-ray (EDX); transmission electron microscopy (TEM); and Fourier transform infrared
spectroscopy (FT-IR) were used to characterise the samples generated. The observation that the Cr
2
O
3
nanoparticles results
exhibited hexagonal crystalline structures was demonstrated by XRD analysis. The Cr and O in the Cr
2
O
3
nanoparticle samples
was confirmed as original materials using energy-dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy
phase analysis. TEM results demonstrated that the different of calcination temperature from 500 to 800 °C resulted in an increase
average nanoparticle size from 4 nm to 16 nm. X-ray photoelectron spectroscopy (XPS) analyses were used to investigate surface
composition and valence state of the final nanoparticle product. Assessment of the optical energy gap using the Kubelka–Munk
equation was achieved by utilization of diffuse UV-visible reflectance spectra, revealing that the energy band gap reduced with
increasing calcination temperature: from 3.12 to 3.01 eV. Furthermore, increasing particle size was also found to be associated
with increased photoluminescence as demonstrated by photoluminescence (PL) spectra. Lastly, antibacterial activity of the
chromium oxide nanoparticle was assessed
in-vitro
using
Escherichia coli
ATCC 25922 Gram (-ve) and Bacillus Subtilis UPMC
1175 Gram (+ve).
naifalhada@yahoo.comNano Res Appl Volume:4
DOI: 10.21767/2471-9838-C6-025