International Journal of Nanoparticles (29 papers in press)

Regular Issues

• Band Gap of silicon Nanowires along [111] direction doped with Al atoms  
  by sana kausar 
  Abstract: In this work band gap of hydrogen-passivated, free-standing silicon nanowires, oriented along [111] direction with with triangular and hexagonal cross section was studied, We fixed the shape of the cross section and lattice constants along the chain axes were optimized by using DFT-GGA with the CASTEP package also the effect of doping of Al atom on band structure is analyzed.It is observed that H-SiNW semiconductor can be modified as a p type through substitution of Al .It is observed that the band gap of nanowire along [111] direction could reduce by doping alumunium atoms and that time silicon nanowire behave as bulk silicon.
  Keywords: DFT, GGA, nanowire ,CASTEP
   
• Synthesis of V, Pt and Pt-V colloidal nanoparticles  
  by Gerard Leteba, Richard Vanfleet, Candace Lang 
  Abstract: Bimetallic platinum-vanadium nanoparticles have been successfully synthesized by high temperature thermal decomposition of metal precursor salts. Vanadium is a highly reactive metal and poses considerable difficulty in synthesising metallic nanoparticles, while platinum has low reactivity where nanoparticles are easily synthesised. The difficulties associated with the reduction of vanadium salt were circumvented by the use of high boiling point solvents and selected surfactants. Co-reduction using platinum precursors compatible with the high temperature processes was required for bimetallic nanoparticle synthesis. The chemical synthesis route described is novel, robust and highly reproducible. Microstructural characterisation of nanoparticles synthesised as described, using transmission electron microscopy, reveals single-crystal particles.
  Keywords: metallic nanoparticles; nanoparticle synthesis
   
• Mathematical models for the viscosity-temperature relationship of the lubricants containing nanoparticles and its applications to journal bearings  
  by Sreedhar Babu Kalakada, PrabhakaranNair Kumarapillai, Rajendra Kumar P K 
  Abstract: In this paper, various mathematical models obtained for relationship between viscosity and temperature for the lubricants containing nanoparticles are presented. These models are used to predict the static performance characteristics of thermohydrodynamic journal bearing operating under lubricants containing nanoparticles. The nanoparticles used for the present work are copper oxide (CuO), cerium oxide (CeO2) and aluminum oxide (Al2O3). Viscosity models for the nanolubricants are developed with the available experimental data to obtain the relationship between viscosity, concentration of nanoparticles and temperature. These models are essential for the computation of performance characteristics of thermohydrodynamic journal bearings. The modified Reynolds and energy equations are used to obtain pressure and temperature distribution in the lubricant film and these equations are solved by using the finite element method and a direct iteration scheme. The static performance characteristics of thermohydrodynamic journal bearing in terms of load capacity, attitude angle, end leakage and friction factor are computed for various values of eccentricity ratios and aspect ratios. The developed mathematical models for viscosity and temperature of lubricants which contains nanoparticles are useful and effective for the computation of performance characteristics of the bearing. The computed results show that addition of nanoparticles increase the viscosity of lubricants and in tern load capacity of journal bearing when the bearing is subjected to large shearing rates due to high speed.
  Keywords: lubricant viscosity: nanoparticles: viscosity models: journal bearing: performance characteristics
   
• Biogenic synthesis by Gracilaria corticata for efficient production of biocompatible silver nanoparticles and its applications  
  by Saraniya Devi C, Valentin Bhimba B 
  Abstract: Biosynthesis of silver nanoparticles (AgNPs) from seaweed extracts is currently under exploitation. Seaweed extracts are cost effective and eco-friendly and thus can be an economic and efficient alternative for large-scale synthesis of nanoparticles. The present study reports the synthesis of AgNPs from silver precursor, silver nitrate using aqueous extract of seaweed Gracilaria corticata. The organic compounds present in the filtrate of G. corticata were mainly responsible for reduction of silver ions to AgNPs. The filtrate when added to 1mM aqueous silver nitrate solution at 121˚C changed to dark brown color solution within ten minutes, which confirms the bioreduction. These extremely stable AgNPs were characterized by UV-Vis spectrophotometer, FTIR, XRD, TEM, and EDS analysis. The nanoparticles exhibited maximum absorbance at 424 nm in the UV spectrum. The presence of proteins was identified by FTIR. TEM micrograph revealed the formation of polydispersed and spherical shaped nanoparticles with the size range of 10-50nm and the presence of elemental silver were confirmed by EDS analysis. These nanoparticles showed cytotoxic activity against Hep 2 cells.
  Keywords: Silver nanoparticles, Gracilaria corticata, Cytotoxicity, Hep2 cell lines
   
• Optical and magnetic properties of Fe-doped ZnO nanoparticles prepared by the sol- gel method  
  by Talaat Hammad 
  Abstract: Fe-doped ZnO nanoparticles were prepared in a solvo- thermal via sol-gel process by base-catalyzed hydrolysis of zinc acetate with doping concentrations from 2 up to 5% Fe. The structural, magnetic and optical properties of the samples by using X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EADX) analysis, Superconducting Quantum Interferometer Device (SQUID) and UVVIS spectroscopy. The structural characterization by XRD and TEM confirmed the phase purity of the samples and indicated a reduction in particle size with increase in the dopant (Fe) concentration in ZnO. The Fe-doped ZnO samples possess ferromagnetism at room temperature with significant changes in M H loop with increasing doping concentration. The hysteresis loops reveal that the saturation magnetization Ms and the coercivity Hc for 2% Fe and 5% Fe-doped ZnO are 2.29 emu/g, 3.91 emu/g, 671 Oe and 659 Oe, respectively. The optical properties were determined by UVvis spectrophotometer and luminescent spectrometer. In this study, the optical band gap of ZnO nanoparticles increased from 3.5 eV to 3.71 eV when the Fe concentration was increased up to 5 %. In the present work, the optical and magnetic properties of Fe doped ZnO nanoparticles is improved by a sol gel method.
  Keywords: optical, magnetic, Fe-doped ZnO, nanoparticles
   
• Synthesis and photocatalytic activity of (S, N)-codoped TiO2 nanoparticles and nanotubes with high N and S contents  
  by H. Y. He 
  Abstract: (N, S)-codoped TiO2 nanotubes were fabricated by hydrothermally treating (N, S)-codoped TiO2 nanoparticles in a NaOH solution at 110
  Keywords: semiconductors; chemical synthesis; TEM; optical properties; catalytic properties
   
• Nanosuspensions:A boon for suspension stability  
  by Ashish Verma, Mahesh Bindal 
  Abstract: Nanosuspensions have emerged as a promising strategy for the efficient delivery of hydrophobic drugs because of their versatile features and unique advantages. The poor water solubility of drugs is major problem for drug formulation. To date, nanoscale systems for drug delivery have gained much interest as a way to improve the solubility problems. The reduction of drug particles into the sub-micron range leads to a significant increase in the dissolution rate and therefore enhances bioavailability. Nanosuspensions are promising candidates that can be used for enhancing the dissolution of poorly water soluble drugs. Nanosuspensions contain submicron colloidal dispersion of pharmaceutical active ingredient particles in a liquid phase stabilized by surfactants. Production of drugs as nanosuspensions has been developed for drug delivery systems as an oral formulation and non-oral administration. Currently, efforts are being directed to extending their applications in site-specific drug delivery.This review describes the methods of pharmaceutical nanosuspension production, formulations and pharmaceutical applications in drug delivery as well as the marketed products.
  Keywords: Nanosuspensions, drug delivery, bioavailability, colloid
   
• Synthesis and characterization of low-k dielectric materials development- Au doped Ceria-Rice husk Silica (Au/Ce-Silica) nanocomposites derived from biomass
  by Jothi ramalingam 
  Abstract: To realize high performance in IC devices, it is necessary to reduce the RC delay, cross talk, and power consumption. An effective method to make these reductions is to decrease the parasitic capacitance by employing a low dielectric constant (low-k) material in the intermetal dielectrics (IMD). Present research topic is deal with the synthesis and characterization of gold doped in ceria-silica, derived from rice husk biomass materials. Large amount of silica recovered from waste rice husk silica, hence the silica materials derived from waste product can be the low cost and used for potential application such as low-k dielectric material development. Gold doping on ceria-mixed silica derived from rice husk is carried out by insitu method (Au/Ce-Silica-A) as well as by co-precipitation method (Au/Ce-Silica-B). Au/Ce-Silica-A and Au/Ce-Silica-B shown the low-k dielectric constant compared to bulk ceria-silica.
  Keywords: Gold, ceria-silica, low dielectric, rice husk, catalyst
   

Special Issue on: "Semiconductor Microstructure and Properties"

• Scanning laser induced current measurements on silicon wafer with through silicon via (TSV) structure
  by Shin-ichi Takasu, Ryouta Zaizen, Woon Choi, Hajime Tomokage, Haruki Sueyoshi 
   
• Illuminated Versus Dark Lock-in Thermography Investigations of Solar Cells
  by Otwin Breitenstein 
   
• Properties of Al-doped ZnO thin films grown by pulsed laser deposition on Si(100) substrates
  by Fouad Kermiche, Adel Taabouche, Faouzi Hanini, Sarah Menakh, Abderrahmane Bouabellou, Yacine Bouachiba, Tahar Kerdja, Mohamed Bouafia, Saad Amara 
   
• Interaction Between a Laser Beam and Semiconductor Nanowires: Application to the Raman Spectrum of Si Nanowires
  by J. Anaya, A. Torres, C. Prieto, J. Jimenez, A Rodríguez, T. Rodríguez 
   
• Annealing effect on photoluminescence properties of SiO2/SiNx coating
  by S. Meziani, A. Moussi, L. Mahiou, R. Outemzabet 
   
• Characterization of TCO AZO/ glass structures by spectroscopic ellipsometry
  by Amara Saad, Bouafia Mohamed 
   
• Characteristics of Al-doped TiO2 thin films grown by pulsed laser deposition
  by Faouzi Hanini, Yacine Bouachiba, Fouad Kermiche, Adel Taabouche, Abderrahmane Bouabellou, Tahar Kerdja, Kamel Boukheddaden 
   
• Evaluation of Diameter Effects of Individual Coaxial SiC/SiO2 Nanowires on their Acoustic Parameters
  by Linda Achou, Abdellaziz Doghmane, Yahya Al-Sayad, Kahina Ammiali, Zahia Hadjoub 
   
• Ultraviolet MSM photodetector with fast response based on ZnO thin film
  by Ghania Harzallah, Mohamed Remram 
   
• Effect of annealing on the structural and optical properties of sputtered HfNx thin films
  by H. Gueddaoui, G. Schmerber 
   
• TiO2 thin films studied by FTIR, AFM and Spectroscopic ellipsometry
  by Y. Bouachiba, F. Hanini, A. Bouabellou, F. Kermiche, A. Taabouche, M. Bouafia, S. Amara, S. Sahli, K. Boukheddaden 
   
• Characterization Of ZnO Thin Films Doped And Co-Doped Grown By Pneumatic Spray Pyrolysis
  by F. Chouikh, Y. Beggah, H. Mati, Y. Bouznit, M. Birem, N. Ariche, M. S. Aida 
   
• Low energy electron irradiation effect on optical and electrical properties of InGaN/GaN multiple quantum well structures
  by E.B. Yakimov 
   
• Electroluminescence properties of InGaN/GaN multiple quantum well light emitting diodes
  by Sayad Yassine, Nouiri AbdelKader 
   
• An Ebic Model To Describe Two Close Grain Boundaries In Semiconductors
  by A. Lahreche, Y. Beggah, D. Mekki 
   
• Calculation of an n+pSi Diode Collection Efficiency and Comparison with Experiments
  by A. Chemam, S. Hamici, D.E. Mekki, R.J. Tarento 
   
• Physical Modeling of Carbon Nanotube Field Effect Transistor
  by Rebiha Marki, Chérifa Azizi 
   
• Effect of the Surface Recombination and the Depletion Region on the Electron Beam Induced Current at a Schottky Nanocontact
  by Noura Ounissi, Mohammed Ledra, Nouar Tabet 
   
• Investigation of ZnO nanostructure: Effect of metal and spinning speed on the physical properties
  by M. Benhaliliba, C. E. Benouis, M.S. Aida, Y.S Ocak, F. Yakuphanoglu 
   
• Microstructure and Opto-electrical properties of SnO2:In2O3 alloys thin films prepared by Ultrasonic Spray
  by F. Ynineb, A. Hafdallah, N. Attaf, M.S. Aida, J. Bougdira, H. Rinnert 
   
• Impact of the polysilicon doping level and thermal oxidation temperature on the properties of P-MOS capacitor structures
  by Moufida Bouzerdoum, Boubekeur Birouk