MATERIALS SCIENCE-POLAND (Mater Sci)

Publications in this journal

• Article: Photodecomposition of Rhodamine B on TiO2/SiO2 thin films prepared by sol-gel method

  M. NOCUŃ, S. KWAŚNY, J. ZONTEK
  MATERIALS SCIENCE-POLAND 02/2013;
• Article: Investigation of effects produced by chemical functionalization in single-walled and multi-walled carbon nanotubes using Raman spectroscopy

  KHURSHED A. SHAH, S. S. ISLAM
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  ABSTRACT: Single-wall carbon nanotubes (SWNTs) as well as multi-wall carbon nanotubes (MWNTs) were characterized by Raman spectroscopy to observe the changes in their physical and structural properties on functionalization. When SWNTs or MWNTs are chemically treated, the defects are created. The analysis of radial breathing mode (RBM) showed that the diameter of the single wall carbon nanotubes changed after functionalization. In the carboxylated sample, the intensity of the disordered band (D-mode) increased more than in the pristine samples. The increase in the D-band intensity in SWNTs after functionalization can be attributed to carbon atoms excited from sp2 to sp3 hybridization. A higher intensity ratio in D-and G-mode (ID/IG) was observed after functionalization with carboxylic group (COOH). The intensity ratio ID/IG increased on acid treatment which was evident from the Raman spectra and their analysis. In case of MWNTs, the intensity of D band became equal to the intensity of G band, which was due to the huge number of defects that had been introduced in the sidewalls. Moreover, it was found in this study that the MWNTs can be much easier chemically functionalized than SWNTs under the same physical conditions.
  MATERIALS SCIENCE-POLAND 01/2013; 31(2):276-280.
• Article: Fast UV detection and hydrogen sensing by ZnO nanorod arrays grown on a flexible Kapton tape

  J.J. HASSAN, M.A. MAHDI, S.J. KASIM, NASER M. AHMED, H. ABU. HASSAN, Z. HASSAN
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  ABSTRACT: Author copy ZnO nanorod arrays were grown on a flexible Kapton tape using microwave-assisted chemical bath deposition. High crys- talline properties of the produced nanorods were proven by X-ray diffraction patterns and field emission scanning electron microscopy. Additionally, the photoluminescence spectrum showed higher UV peaks compared with visible peaks, which indicates that the ZnO nanorods had high quality and low number of defects. The metal-semiconductor-metal (MSM) configuration as used to fabricate UV and hydrogen gas detectors based on the ZnO nanorods grown on a flexible Kapton tape. Upon exposure to 395 nm UV light, the UV device exhibited fast response and decay times of 37 ms and 44 ms, respectively, at a bias oltage of 30 V. The relative sensitivities of the gas sensor made of the ZnO nanorod arrays, at hydrogen concentration of 2 %, room temperature, 150 � C and 200 � C, are 0.42, 1.4 and 1.75 respectively.
  MATERIALS SCIENCE-POLAND 01/2013; 31(2):180.
• Article: Size effect and dielectric properties of NH4H2PO4 - porous glass composites.

  Ciżman Agnieszka, Komar Jarosław, Marciniszyn Tomasz, Poprawski Ryszard, Rysiakiewicz-Pasek Ewa, Sieradzki Adam
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  ABSTRACT: NH4H2PO4 nano-composite antiferroelectric materials in porous glass have been studied by means of dielectric and dilatometric investigations. Dielectric spectroscopy measurements in a wide frequency range are reported here for the first time, for both the antiferro- and paraelectric phases of ammonium dihydrogen phosphate (ADP) embedded in a porous matrix. Low frequency relaxation processes above the phase transition temperature were shown to occur. An investigation of the thermal expansion revealed a negative volume jump at the phase transition point. It was found that the phase transition temperature in ADP crystals embedded in porous glass decreased with the decrease of the mean pore size. The experimentally observed shift of the phase transition temperature is caused by a combination of size and pressure effects.
  MATERIALS SCIENCE-POLAND 01/2012; vol. 30(nr 2,):143-150..
• Article: Possibility of decreasing the activation energy of resistivity of mullite by doping with nickel ion

  D. ROY, S. DAS, P. NANDY
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  ABSTRACT: Monophasic mullite samples doped with 0.002 M, 0.02 M, 0.1 M, 0.15 M and 0.2 M of NiCl2 were prepared via sol–gel technique. The prepared gels were dried, grinded, pressed into pallets and sintered at 400 °C, 800 °C, 1000 °C and 1300 °C. The electrical resistivity and activation energy of the composites have been measured and the variation of resistivity with concentration of the nickel ion doping has been investigated. The resistivity decreases with the concentration of nickel ions. X-ray analysis confirms the presence of Ni 2+ ions in mullite. The Ni2+ ion, which substitutes Al 3+ ion in the octahedral site of mullite structure, can be considered as an efficient factor in reducing the resistivity. The mullite unit cell parameters suggest predominant incorporation of NiCl2 in a glassy phase. The lowest activation energy of resistivity (Eact) that was achieved is 1.22 eV at 0.02M.
  MATERIALS SCIENCE-POLAND 01/2012;
• Article: Corrosion behaviour and bioactivity of electrophoretically deposited hydroxyapatite on titanium in physiological media (Hanks’ solution)

  S.G. Mohamed, A. A. ABDELTAWAB, M. A. SHOEIB
  MATERIALS SCIENCE-POLAND 01/2012; 30(3):231.
• Article: Marakkar Kutty P V, Subrata Dasgupta and Sibdas Bandyopadhyay, ‘Soft Chemical Synthesis of Nanosized Zinc Aluminate Spinel from the Thermolysis of Different Organic Precursors’, Materials Science, Poland, 29 (2)2011, 121-126

  Subrata Dasgupta Marakkar Kutty P V, Sibdas Bandyopadhyay
  MATERIALS SCIENCE-POLAND 01/2011;
• Article: Synthesis of mesoporous silica using cationic surfactant templating in different inorganic acid source

  W.-D. XIANG, Y.-X. YANG, J.-L. ZHENG, L. CAO, H.-J. DING, X.-N. LIU
  MATERIALS SCIENCE-POLAND 06/2010;
• Source

  Available from: wroc.pl

  Article: Advances in flash memory devices

  C. Ludwig, M.F. Beug, K.-H. Küsters
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  ABSTRACT: Fundamental challenges are discussed concerning the down-scaling of flash memory cells for mass storage applications. A general scaling issue for all various memory cell concepts is the structuring limit of conventional lithography. Therefore sub-lithographical structuring methods like e.g., double-patterning for future flash chips, have been evaluated. Another common scaling challenge of charge trapping (CT) and floating gate (FG) cells, the two future concurrent flash memory cell concepts, is the introduction of new materials such as high k dielectrics. Their implementation into CT and FG cells and the scaling related electrical issues of both cell concepts is also been discussed.
  MATERIALS SCIENCE-POLAND 01/2010; 28(1):105.
• Source

  Available from: wroc.pl

  Article: Methods of manufacturing of potassium titanate fibres and whiskers. A review

  T Zaremba, D Witkowska
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  ABSTRACT: Titanate fibres and whiskers are new materials with high heat resistance and good chemical stability. They have found numerous applications such as ion exchanger materials, thermal insulators, reinforcements, catalysts, photocatalysts and substitutes of asbestos. In this paper, the methods of fabricating potassium titanate fibres and whiskers have been discussed, e.g., calcination, hydrothermal reaction, flux growth, sol -gel technique, and others. Because asbestos fibres are known to cause fibrotic diseases in lungs we also refer to studies into the toxicity and carcinogenicity of potassium titanate fibres and whiskers.
  MATERIALS SCIENCE-POLAND 01/2010; 28.