Optical and Structural Properties for Pure and Fe-Ni Alloy
Composite Buckypaper
Wasan R. Saleh1*, Rajaa H. Mutlk1, S.F.A. Acquah2,
Ghuson H. Mohamed1, Eden Steven3
1
Physics Department, College of Science, University of Baghdad, Baghdad, Iraq
2
Dept. of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way,
Tallahassee, FL 32306, USA
3
National High Magnetic Field Laboratory and Department of Physics, 1800 East Paul Dirac
Drive, Tallahassee, FL 32310, USA
*
Correspondence to: wasan_alazawi@yahoo.com
Key Words: Bucky paper, Iron-Nickel alloy, optical properties, structural properties
ABSTRACT
This study demonstrates the synthesis of buckypaper (BPs) films using
metallic short thin multi-wall carbon nanotubes (MWCNTs)
functionalized with NH2 of diameter 9.5 nm and length less than 1 m.
Buckypapers are films of preformed networks of well-dispersed
MWCNT. The optical and structural properties of pure BP and composite
BPs with three concentrations of Iron-Nickle alloy (20, 60,100%) were
studied. The optical absorbanc spectra and Ramman spectra were
recorded. The results show that the absorbance spectra for pure and
composite BPs highlight no significant change in the behavior due to film
formation. The absorbance for the composite BPs increased with the
increasing the concentration of embedded material. It is found there are
two energy gaps Eg for direct and indirect transitions. The values of Eg of
for direct allowed transition are about 3.75 and 4.1 for pure buckypaper,
while for indirect allowed transition are about 3.5 eV and 2 eV. The tail
width for the composite BPs increased with the increasing of
concentration and larger than that of pure BP. The refractive index,
extinction coefficient, real and imaginary parts for dielectric constant
have been determined and compared. In Ramman spectra, the peak of D
band has high intensity than that of G band, according to the large defects
for the prepared film, also the films contain SP2.
The surface morphology for all films is studied from AFM micrograph,
SEM, and XRD. The films show grains, uniformity distributed for CNTs,
quite uniform, and free from cracks. The root mean square (rms) of the
films surface roughness was indicating a smooth surface of synthesis
buckypaper. XRD results how that the structure for pure BP is
polycrystalline, while for composites films this crystalline decreased with
the increasing the concentration of embedded material. This smart
material will have wide applications in the field of sensor and detectors.