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Nazanin Hamnabard,Younes Hanifehpour,주상우 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
Bare CdSe, neodymium (Nd)-doped CdSe, and a graphene-oxide (GO)/CdSe nanohybrid were preparedvia hydrothermal strategy. These materials were characterized by XRD, SEM, TEM, Raman, XPS, and theBrunauer–Emmett–Teller (BET) method. Compared to the pure CdSe, the slight shift of diffraction peaksto lower angles in all samples indicated the presence of either Nd+3 ions or GO. The GO/CdSe nanorodshad much higher specific capacitance than the Nd-doped CdSe and bare CdSe. Among different contentsof Nd, 0.015 Nd doped CdSe showed the highest specific capacitance. The phase stability during cyclingand charge-transfer were greatly improved by formation of GO-based composite.
Hanifehpour, Y.,Hamnabard, N.,Mirtamizdoust, B.,Joo, S. W. Springer Science + Business Media 2016 Journal of inorganic and organometallic polymers a Vol.26 No.3
<P>Terbium-doped cadmium sulfide nanoparticles with different terbium contents were successfully synthesized via sonochemical route. The prepared samples were characterized by X-ray diffraction, scanning electron microscopy, photoelectron X-ray spectroscopy, and UV-Vis diffuse reflectance spectroscopy techniques. The as-prepared nanocatalyst were used for sonocatalytic degradation of Methylene Blue. Among the different amounts of dopant, 8 % Tb-doped CdS showed the highest sonocatalytic activity. The order of inhibitory effect of radical scavengers was 1, 4 Benzoquinone > SO3 (2-) > CO2 (3-)> I-. The effects of various parameters such as initial dye concentration, catalyst loading, ultrasonic power, and the presence of radical scavengers were investigated.</P>
요네스피로즈살라리,Nazanin Hamnabard,아니타,주상우,민봉기 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
LnxPb1xTe(Ln:Nd3+,Yb3+) nanomaterials were synthesized using the facile hydrothermal method. The prepared samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). XRD analysis demonstrated that PbTe phase is cubic. By increasing the concentration of Ln3+ ions, the DRS spectra of PbTe shows blue shifts instead of red shifts due to bonding changes. XPS analysis of doped PbTe samples confirms the incorporation of Yb and Nd into the lattice. The electrical conductivity of Lndoped PbTe is shown to be higher than that of pure PbTe, and increases with temperature.
Valipour, Alireza,Hamnabard, Nazanin,Meshkati, Seyed Mohammad Hadi,Pakan, Mahyar,Ahn, Young-Ho Royal Society of Chemistry 2019 Dalton Transactions Vol. No.
<P>Crystal phase and morphology variations obtained by simple high-temperature annealing offer promising strategies for employing nanostructured manganese oxide as a cathode catalyst for microbial fuel cells (MFCs). This study examines the effectiveness of simultaneous-phase and morphology-controlled manganese dioxide nanomaterials, designed by annealing a hydrothermally synthesized flower-like δ-manganese dioxide precursor at 300-800 °C, as cathode catalysts for MFCs. MFCs with the best-performing catalyst cathode (at a reasonable mass loading) were also analyzed through cyclic voltammetry and electrochemical impedance spectroscopy. Among MFCs with non-annealed and annealed manganese dioxide cathodes (0.5 mg cm<SUP>−2</SUP>), those with the catalyst annealed at 500 °C (148 ± 7 mW m<SUP>−2</SUP>, CE = 13 ± 1%) generated the most power (5-52%). MFCs with the catalyst annealed at 500 °C at a loading of 1 mg cm<SUP>−2</SUP> as the cathode delivered the highest maximum power density (213 ± 9 mW m<SUP>−2</SUP>, CE = 13 ± 1%), representing 44% of that obtained using Pt/C at 0.5 mg Pt per cm<SUP>2</SUP> (483 ± 11 mW m<SUP>−2</SUP>, CE = 18 ± 2%) and a comparatively low internal resistance (164 ± 2 Ω). Both cyclic voltammetry and electrochemical impedance spectroscopy results were consistent with empirical data. Compared with previously reported cathode materials, the annealed product from the precursor flower-like δ-manganese dioxide annealed at 500 °C (particularly at a loading of 1 mg cm<SUP>−2</SUP>) was a more reliable, efficient, and inexpensive sustainable cathode catalyst for scaled-up MFCs.</P>
Banerjee, A.N.,Hamnabard, N.,Joo, S.W. Ceramurgica ; Elsevier Science Ltd 2016 Ceramics international Vol.42 No.10
Pd-doped anatase TiO<SUB>2</SUB> nanoparticles were synthesized by a modified sol-gel deposition technique. The synthetic strategy is applicable to other transition and post-transition metals to obtain phase-pure anatase titania nanoparticles. This is important in the sense that anatase titania forms the most hydroxyl radicals (compared to other polymorphs like rutile, brookite, etc.) for better photocatalytic performance. XRD and Raman data confirm the phase-pure anatase formation. Doping of Pd<SUP>2+</SUP> into Ti<SUP>4+</SUP> sites (for substitutional doping) or interstitial sites (for interstitial doping) creates strain within the nanoparticles and is reflected in the XRD peak broadening and Raman peak shifts. This is because of the ionic radii difference between Ti<SUP>4+</SUP>(~68pm) and Pd<SUP>2+</SUP>(~86pm). XPS data confirm the formation of high surface titanol groups at the nanoparticle surface and a large number of loosely bound Ti<SUP>3+</SUP>-O bonds, both of which considerably enhance the photocatalytic activity of the doped nanoparticles. A comparative study with other metal doping (Ga) shows that TiO<SUB>2</SUB>: Pd nanoparticles have more Ti<SUP>3+</SUP>-O bonds, which enhance the charge transfer rate and hence improve the photocatalytic activity compared to other transition and post-transition metal-doped titania nanostructures.
Fatemeh Heydari,Amir Maghsoudipour,Mohsen Ostad Shabani,Zohreh Hamnabard,Sajad Farhangdoust 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.1
The objective of the present work is to study properties of a composite material consisting of zirconia nanoparticles in a glass matrix based on the system of BaO-CaO-SiO2-B2O3-Al2O3. Zirconia nanoparticles are added by 0-20 vol.% into the glass matrix to prepare the glass composites. Coefficient of thermal expansion, glass transition temperature and dilatometric softening point temperature of specimens are determined by means of dilatometry analysis. Coefficient of thermal expansion of base glass is 10.38 × 10−6 k−1 and by increasing zirconia content to 10, 15, and 20 vol.%, coefficient of thermal expansion reduces down to 9.88 × 10−6 , 9.84 × 10−6 and 9.76 × 10−6 k−1 respectively. Sinterability of different specimens is studied by increasing zirconia nanoparticles. Electrical properties are measured in different temperatures, and results show that with increment of zirconia nanoparticles, temperature resistivity of specimens has been decreased. Microstructural investigation reveals a well-adhered bonding between the sealants and electrolyte.