Fabrication and properties of manganese doped zinc oxide
Fabrication and properties of manganese doped zinc oxide
... 1.1 Zinc Oxide 1.1.1 The Structure of Zinc Oxide 1.1.2 The Properties of Zinc Oxide 1.1.3 Applications of Zinc Oxide 1.1.4 Doping of Zinc Oxide ... in un -doped and Mn -doped ZnO [9] Obviously, the change in the optical properties is strongly dependent on the method of incorporation of Mn, fabrication conditions, and properties of un -doped ... as zinc interstitials, oxygen vacancies, and extended defects, such as threading dislocations [11] 1.1.2 The Properties of Zinc Oxide 1.1.2.1 Electrical Properties As a direct and large-band-gap...
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Báo cáo toán học: " Structural, optical and magnetic studies of manganese-doped zinc oxide hierarchical microspheres by self-assembly of nanoparticles" docx
... Structural, optical, and magnetic studies of manganese-doped zinc oxide hierarchical microspheres by self-assembly of nanoparticles Yao-Ming Hao1, Shi-Yun ... study, a series of manganese [Mn]-doped zinc oxide [ZnO] hierarchical microspheres [HMSs] are prepared by hydrothermal method only using zinc acetate and manganese acetate as precursors and ethylene ... 41 Rekha K, Nirmala M, Nair M, Anukaliani A: Structural, optical, photocatalytic and antibacterial activity of zinc oxide and manganese doped zinc oxide nanoparticles Physica B 2010, 405:3180-3185...
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báo cáo hóa học:" Structural, optical and magnetic studies of manganese-doped zinc oxide hierarchical microspheres by self-assembly of nanoparticles" docx
... Structural, optical, and magnetic studies of manganese-doped zinc oxide hierarchical microspheres by self-assembly of nanoparticles Yao-Ming Hao1, Shi-Yun ... study, a series of manganese [Mn]-doped zinc oxide [ZnO] hierarchical microspheres [HMSs] are prepared by hydrothermal method only using zinc acetate and manganese acetate as precursors and ethylene ... 41 Rekha K, Nirmala M, Nair M, Anukaliani A: Structural, optical, photocatalytic and antibacterial activity of zinc oxide and manganese doped zinc oxide nanoparticles Physica B 2010, 405:3180-3185...
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Growth and characterisation of cobalt doped zinc oxide 1
... semiconductor”, Adv Mater 16 , 211 5 (2004) 12 1 S Ramachandran, A Tiwari, and J Narayani, “Origin of room-temperature ferromagnetism in cobalt- doped ZnO”, J Electronic Mater 33, 12 98 (2004) 12 2 H J Lee, G ... properties of Co -doped ZnO nanoparticles”, Appl Phys Lett 86, 10 311 3 (2005) 75 J S Hong and R Q Wu, “Magnetic ordering and x-ray magnetic circular dichroism of Co doped ZnO”, J Appl Phys 97, 063 911 (2005) ... P Jena, “Magnetism and energetics of Mn -Doped ZnO (10 0) thin films”, Phys Rev B 69, 233 310 (2004) 13 8 Q Wang and P Jena, “First-principles study of magnetism in (11 0) Zn1–xMnxO thin film”,...
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Growth and characterisation of cobalt doped zinc oxide 2
... (Zn0.75Co0 .25 O + CoO + Co) structures, respectively [After J H Kim, 20 02, Ref 12] 50 Chapter Cobalt doped zinc oxide 2. 3 .2. 2 Choice of dopants As ZnO can be both p-type and n-type doped, the choice of ... 1 725 02 (20 06) 72 Chapter Cobalt doped zinc oxide 22 K Sato and H K Yoshida, “Stabilization of ferromagnetic states by electron doping in Fe-, Co- or Ni -Doped ZnO”, Jpn J Appl Phys 40, L334 (20 01) ... position of ZnO (0 02) for various Co -doped ZnO films on Al2O3 (0001) substrates The peak position of pure ZnO (0 02) is 34. 422 o, however, with the 55 Chapter Cobalt doped zinc oxide substitution of...
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Growth and characterisation of cobalt doped zinc oxide 3
... s for -doped samples at a sputtering power of 10 W For the co -doped samples, Co was added to ZnO:Al by co-sputtering Co with ZnO and Al2O3 On the other hand, in -doped samples, Co was doped “digitally” ... Al2O3 Substrate e) Deposit Al2O3, Lift-off f) Ion-mill to form Hall bar Al2O3 Substrate Al2O3 Substrate g) Coat resist h) Write electrodes, develop Al2O3 Substrate Al2O3 Substrate j) Lift-off ... mechanism of ferromagnetic ordering in Co -doped ZnO, in combination with other techniques (a) (b) Figure 3- 6 MCD hysteresis loop obtained at 30 0 K with energy of 3. 4 eV for (a) pure ZnO and (b) Codoped...
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Growth and characterisation of cobalt doped zinc oxide 4
... the peak at 44 .5o was near peak positions of CoO (200) 107 Chapter Structural Characterization FCC at 40 .6o and 42 .4o, Co (111) at 44 .217o, ZnCo2O4 (40 0) at 44 .74o and Co3O4 (40 0) at 44 .81o For ... state of Co in ZnCo2O4 and Co3O4 was 3+ and 4+ , and that in Co clusters was 0, respectively In comparison, the corresponding δ -doped Co98s sample, showed a variation of and 2+ valence state (Fig 4- 11 ... ) 34. 6 34. 4 34. 2 34. 0 33.8 33.6 33 .4 0.05 0.1 0.15 0.2 0.25 0.3 0.35 Co composition Figure 4- 4 XRD peak position (around 34o) versus Co composition For samples with x > 0.2, as shown in Fig 4- 3...
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Growth and characterisation of cobalt doped zinc oxide 5
... formation of other secondary phases 133 Chapter Magnetic properties and its origins 0. 05 0.10 0. 15 0.20 0. 25 0.30 0. 35 0. 05 0.10 0. 15 0.20 0. 25 0.30 0. 35 Figure 5- 4 (a) In-plane M-H curves of co -doped ... in-plane and out -of- plane configuration and corrected M-H curves (b), (d) and (f) respectively Out -of- plane M-H curves for co -doped sample Co3W (Zn0.95Co0.05O) at 2, 50 and 300 K (g) as determined and ... 2.0 3.0 4.0 5. 0 Photon Energy (eV) MCD (mdeg) 700 (b) 350 300K - 350 6K -700 1.0 2.0 3.0 4.0 5. 0 Photon Energy (eV) Figure 5- 7 MCD spectra of co -doped (a) Co32W (Zn0.71Co0.29O) and δ -doped (b) Co98s...
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Growth and characterisation of cobalt doped zinc oxide 6
... (Ohm) 1 .66 E+022 1 .66 ×10 1 .64 E+022 1 .64 ×10 (c) 1 .62 E+022 1 .62 ×10 1 .60 E+022 1 .60 ×10 1.58×10 1.58E+022 1. 56 102 1.56E+02 -0.04 -0.02 0.02 0.04 Field (T) Figure 6- 13 dI/dV curves as a function of bias ... in Co -doped samples 150 Chapter Origin of ferromagnetism from transport studies 1. 966 20K 1. 964 -3 1. 962 10K 8K 1. 960 6K 1.958 (a) -2 50K 7 .62 30K 7 .60 10K 7.58 4.2K -1 (b) A (x=0.05) 7 .64 14K ... applied current of 0.1 mA 169 Chapter Origin of ferromagnetism from transport studies -3 7 .6 10 × (a) -3 7.2×10 × -3 6. 8×10 × -3 6. 4×10 × -3 6. 0×10 × -3 7.2×10 (b) -3 6. 8×10 -3 6. 4×10 -3 6. 0×10 Resistance...
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Growth and characterisation of cobalt doped zinc oxide 7
... XRD and TEM data suggested that, although Co clusters had been formed in heavily co -doped samples, the dominant phase of these samples was still in the form of Co -doped ZnO The formation of substitutional ... composition for formation of secondary phases and Co clusters could be identified clearly On the other hand, the shape of the MR curves for heavily doped samples resembled well those of granular materials ... Conclusions and Future Work Using the MR measurements strong sp-d interactions in lightly and moderately doped samples had been observed From the evolution of MR curves with the increase of Co composition,...
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synthesis, structure and magnetic properties of iron-doped tungsten oxide nanorods
... profiles of the Fe-doped tungsten oxide nanorods after annealing in air The inset shows the morphology of the annealed sample and the area for recording EDX spectrum other iron oxides because of the ... in different iron oxides In order to determine the magnetization contribution of different magnetic phases, a basic knowledge for the magnetic properties of bulk Fe and its oxides is crucial ... magnetization at K of the asprepared sample in an applied field of T is as large as 56 Am2 =kg, arising from the magnetization of metallic Fe and its oxides Assuming a magnetic moment of 2:2mB per iron...
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influence of DC magnetron sputtering parameters on the properties of amorphous indium zinc oxide thin film y s jung
... – – – – Amorphous Amorphous Amorphous Amorphous Amorphous Amorphous Amorphous Amorphous Amorphous Crystalline Amorphous Amorphous Amorphous Amorphous Y. S Jung et al / Thin Solid Films 445 (2003) ... using the gases of smaller mass such as He w35x Employing the explanation to this study, in the case of using Ne gas, which has smaller mass, sputtered species directed to the substrate lose less ... highest transmittance Conclusions In this work, amorphous or crystalline indium zinc oxide (IZO) thin films were deposited on glass or Si wafer substrates using DC magnetron sputtering technique The...
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Báo cáo hóa học: "Fabrication and Properties of Porphyrin Nano- and Microparticles with Novel Morphology" docx
... porphyrin nano- and micro-particles made up of J- and H-heteroaggregates to date [26] The photocatalytic and photoelectronic properties of TiO2 sensitized with this type of porphyrin nano- and micro-particles ... microscopy (Japan) Results and Discussion TEM Images of the Porphyrin Nano- and Microparticles The TEM images of sample are shown in Fig 1a, b Two types of porphyrin particles with different shapes ... dipole of CoTPPS4- and that of H2TAPP4+ in the formation process of porphyrin nanoand micro-particles [33, 34] The Soret and Q bands of sample solution placed for 72 h are not shifted, and the...
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Báo cáo hóa học: " Fabrication and Properties of Ethylene Vinyl Acetate-Carbon Nanofiber Nanocomposites" docx
... tremendous increment of 350 and 520% with the addition of and wt.% of CNF, respectively The elongation at break, on the other hand, shows steep decrement with the amount of CNF The effects of various high-energy ... dispersion and wetting properties of the nanofibers leading to further improvements in mechanical, dynamic mechanical, and thermal properties of the nanocomposites At similar loading of filler (1 ... Analysis Plotted in Fig 2a is the variation of tensile properties of EVA with the incorporation of different amounts of Fig SEM micrographs of a untreated and b acid-treated CNFs 123 untreated CNF...
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fabrication and characterization of anodic titanium oxide nanotube arrays of controlled
... on working electrodes made of highly ordered anodic titanium oxide nanotube arrays of varied tube length directly formed on Ti foil The lengths of these ATO NT were controlled from to 41 µm while ... Because of the robust structure of the NT arrays and the loose structure of the surface debris, the unwanted deposits on the ATO surface Anodic TiO2 Nanotube Arrays for DSSC J Phys Chem C, Vol ... SEM images of ATO NT after ultrasonic cleaning: (a) top view and (b) side view The inset of (a) shows the enlarged pattern of the ATO NT arrays Figure Length of ATO NT (L) as a function of anodization...
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