Abstract: Cerium dioxide (CeO2) nanoparticles were synthesized by a novel mechanochemical
process. The precursors of Ce2(CO3)3.xH2O and NaOH were mixed at a weight ratio of 4 to 1. The
mixtures were milled using a planetary ball mill with ball to powder ratio of 10:1. The products
were then characterized using a battery of characterization methods, including X-ray diffraction
(XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and gas
adsorption-desorption measurement. The as-prepared particles were largely amorphous with an
average specific surface area of about 119.94 m2/g. Nanocrystalline CeO2 with crystallite size of
4.5 nm was obtained when the sample was annealed in air at 350 oC. The heat treatment results
showed that the crystallinity of nanocrystalline CeO2 increased with increasing annealing
Abstract: Charge transfer complexes (CTC) can be readily introduced into materials by
cohydrolysis-copolymerisation of bis-silylated ter-thiophenes as precursors with TMOS and TEOS
in the presence of TCNQ. CTC formation is shown in the visible spectrum of the xerogel by the
band at 850 nm characteristic of the TCNQ·- radical anion. Vibrational spectra have shown that
strong vibration of C≡N bond at 2184, 2120 and 1595 cm-1 as peaks characteristics of CTC. The
CTC bands are weak and the complex is easily destroyed by washing with acetone, which removes
the TCNQ. The gelification effect of the charge transfer complexes on the hybrid materials of 2,5’’-
bis(trime thoxysilyl)terthiophene/TCNQ/ TMOS showed that the peak with distance of more than
11.68 Å, formed by precursors and matrices, as a lamellar structure. The birefringence of xerogel
BTS3T in presence of alkoxysilane showed that the value is near the detection limit of 0.1 – 0.4 x
10-3, which is weaker than BTS3T / THF with the birefringence value of 4.5 x 10-3.
Abstract: The Current-Voltage-Temperature (I-V-T) characteristics of single layer deposition,
consisting of Zr, Ti, or Cr/p-GaN Schottky diodes were determined in the temperature range 27-
100oC. Sputtering method was used for deposition of these metals on p-GaN. Analysis of the
measured characteristics at room temperature allows the determination of the electrical parameters,
the saturation current Io and the ideality factorη. The barrier heights and effective Richardson
coefficients were determined through activation energy plot. It was found that pinning of Fermi
level occurred for these metal contacts on p-GaN with the carrier concentration of 5.6x 1017 cm-3,
where the Schottky barrier heights of Zr, Ti, or Cr/p-GaN are determined to be in the same range
Abstract: The effects of Indium doped on Porous Silicon Nanostructure (PSN) have been studied.
The Electroluminescence studies on Indium-doped porous silicon nanostructure (In:PSN) are
presented. The main objective of this paper is study the EL effects of Indium doping on PSN.
Porous silicon nanostructure layers have been formed by anodically etching unpolished p-type Si
 wafer with surface resistivity of 1-10 ohm cm-1 in Hydroflouric (HF) solution at 1:1 ratio of
Ethanol. Indium (In) was doped on PSN using cathodic electrodeposition composed of InCl3 and
ethanol electrolythe. A diode structure has been fabricated comprising semi-transparent
Au/In:PSN/p-Si substrate/Al ohmic contact electrode to observe the EL spectra. The In:PSN device
shows increasing on EL and PL Intensity as well as blue-shift EL and PL spectrum is observed.
Possible reasons for the enhancement will be discussed. Technological application of PSN as a light
emitter would have significant impact on numerous technologies such as display panels or
integrated circuits with optoelectronic devices (IO) on board and sensors.
Abstract: The cure process and the mechanical properties of liquid polymethylmethacrylate grafted
natural rubber (LMG30) modified epoxy have been studied. Addition of LMG30 significantly
increased the fracture toughness and the impact strength of the epoxy resin. The fracture toughness
increased up to 22 fold (17.3 MNm-3/2) when modified with 5 phr LMG30. The glass transition
temperature however, decreases as the rubber content increases. The SEM analysis shows uniform
dispersion of rubber particles within the epoxy matrix with average particle size between 0.4 to 0.8
0m in diameter.
Abstract: A series of experiment has been carried out to study the electrochemical
performances of lithium primary cells using different cathode materials. The cathode
material was made of metal oxide, electrolyte, activated carbon, and PVdF with a wt. ratio
of 60: 20:10:10. PVdF was added as a binder. The metal oxides used are MnO2 and V2O5.
The anode was made up of lithium metal and LiI-Li2WO4-Li3PO4 compound is used as an
electrolyte. In this work the open circuit voltage (OCV) of Li/MnO2 and Li/V2O5 obtained is
about 3.0 V and 3.2 V respectively. This shows that LiI-Li2WO4-Li3PO4 compound is
lithium ion conductor. Lithium cell showed better performance at 100º C than at room
temperature. Among these two types of cells investigated, cell Li/V2O5 worked better than
the Li/MnO2 cell at room temperature and at 100°C as this cell exhibits the longest
continuous discharge time and the highest OCV.
Abstract: The corrosion protection property of the coating consisting of acrylic resin mixed with
curcumin and dammar was investigated by immersing in 3% NaCl solution using potential - time
measurement. The investigation was performed until corrosion occurred at the coating and substrate
interface. As the coating degraded the penetration of electrolyte, the potential value of the coated
sample decreases to a value of – 0.65 V. In this study the coating with pigment volume
concentration of KC30% can withstand against corrosion by 3% NaCl solution.
Abstract: In this study, we investigated the contact characteristics of bi-layer thin films, Ag
(200nm)/Ti (100nm) on Si-doped n-type Al0.27Ga0.73N film grown on sapphire substrate. The
contacts were annealed at different temperatures (400°C-800°C) for 10 min in N2 ambient. The
effects of cryogenic cooling immediately after heat treatment for improving ohmic behavior (I-V
linearity) of the samples were reported. Specific contact resistivity, ρc, was determined using
transmission line method (TLM) via current-voltage (I-V) measurements. Scanning electron
microscopy (SEM) measurements were carried out on the as-deposited, annealed (N), and
annealed-and-cryogenically (N+C) treated contacts where the surface morphology of each of these
conditions were compared. In addition, measurement of the samples by atomic force microscopy
(AFM) was taken in order to characterize the surface morphology.
Abstract: The properties of ZnSe/PEO junction photoelectrochemical cells have been
studied under dark and illuminated conditions. ZnSe was electrodeposited onto an
indium tin oxide (ITO) glass and the polymer film of PEO-chitosan: NH4I (+I2) was placed
over it followed by another ITO glass. The polymer film was prepared by the solution
cast technique. The open circuit voltage (Voc) of the fabricated cells was between 300
mV to 400 mV. In the dark the device operates as a diode while under illumination it
operates as a photoelectrochemical cell.
Abstract: In this work, lawsonia pigment obtained from Henna leaves was mixed with acrylic
resin and a mixture of acrylic and dammar resins (RD50%) to form two paint systems BC30% and
BDP30%. The two paint systems were characterized by potential-time measurements, impact
resistance, glass transition temperature (Tg) and cross hatch tests.