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 .....

Ngày tải lên: 06/10/2015, 20:42

... 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 e...

Ngày tải lên: 20/06/2014, 20:20

... 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 e...

Ngày tải lên: 21/06/2014, 17:20

... 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...

Ngày tải lên: 12/09/2015, 08:18

... (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...

Ngày tải lên: 12/09/2015, 08:18

... 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...

Ngày tải lên: 12/09/2015, 08:18

... 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...

Ngày tải lên: 12/09/2015, 08:18

... 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 (Zn0.95C...

Ngày tải lên: 12/09/2015, 08:19

... (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....

Ngày tải lên: 12/09/2015, 08:19

... 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 rese...

Ngày tải lên: 12/09/2015, 08:19

... 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...

Ngày tải lên: 20/03/2014, 13:08

... – – – – 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 dire...

Ngày tải lên: 24/05/2014, 13:53

... 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...

Ngày tải lên: 22/06/2014, 01:20

... 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 nanoc...

Ngày tải lên: 22/06/2014, 01:20

... 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 Arra...

Ngày tải lên: 19/03/2014, 16:48