Degenerated ZnO Nanocrystals: Synthesis, Properties and Applications

2021 ◽  
Author(s):  
◽  
Anzelms Zukuls
Keyword(s):  
Magnetic Properties ◽  
Transition Metals ◽  
Solvothermal Synthesis ◽  
Semiconductor Nanocrystals ◽  
Synthesis Method ◽  
Charge Carriers ◽  
Synthesis Methods ◽  
Free Charge ◽  
Zno Nanocrystals ◽  
Doped Zno

The Ph. D. thesis focuses on the solvothermal synthesis of degenerate Ga3+ doped ZnO semiconductor nanocrystals and the study of the crystalline structure, electronic structure and morphology, as well as optical and magnetic properties of the obtained materials. The experimental part investigates ways to achieve a higher degree of doping and the concentration of free charge carriers, as well as their effect on localized surface plasmon resonance-induced light absorption in the infrared part or the light spectrum or transition metals (Fe3+, Ni2+, Mn2+) doped ZnO magnetization nature. Literature review summarises information through the period from 1954 to 2020, using the latest literature, which is available in internet databases. The review provides information on various nanocrystal synthesis methods used to form zinc oxide nanocrystals. Degenerate semiconductor metal oxides, their optical properties, as well as diluted magnetic oxide semiconductor nanocrystals are considered. The results describe various doped ZnO nanocrystal products that are synthesised by the solvothermal synthesis method and their optical, morphological and physical properties. The results of the research show the possibility to adjust the amount of gallium introduced into ZnO nanocrystals by controlling solvents and additives. The magnetic properties of ZnO nanocrystals co-doped with transition metals and gallium change depending on the amount of gallium introduced; by photodoping Ga-doped ZnO nanocrystals, it is possible to change the concentration of their free charge carriers.

Assessment of Magnetic Properties between Fe and Ni Doped ZnO Nanoparticles Synthesized by Microwave Assisted Synthesis Method

2021 ◽  
Vol 317 ◽  
pp. 119-124
Author(s):  
Sabiu Said Abdullahi ◽  
Garba Shehu Musa Galadanci ◽  
Norlaily Mohd Saiden ◽  
Josephine Ying Chyi Liew
Keyword(s):  
Magnetic Properties ◽  
Zno Nanoparticles ◽  
Room Temperature ◽  
Synthesis Method ◽  
Dilute Magnetic Semiconductors ◽  
High Coercivity ◽  
Microwave Assisted Synthesis ◽  
Ferromagnetic Behavior ◽  
Microwave Assisted ◽  
Doped Zno

The emergence of Dilute Magnetic Semiconductors (DMS) with a potentials for spintronic application have attracted much researches attention, special consideration has been given to ZnO semiconductor material due to its wide band gap of 3.37 eV, large exciting binding energy of 60 meV, moreover, its ferromagnetic behavior at room temperature when doped with transition metals. MxZn1-xO (M = Fe or Ni) nanoparticles were synthesized by microwave assisted synthesis method calcined at 600°C. The structural, morphological and magnetic properties of these nanoparticles were studied using X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and Vibrating Sample Magnetometer (VSM) respectively. Single phase Wurtzite hexagonal crystal structure was observed for the undoped and Fe doped ZnO nanoparticles with no any impurity, whereas Ni doped ZnO nanoparticles shows the formation of NiO impurities. The magnetic measurement reveals a diamagnetic behavior for the undoped ZnO meanwhile a clear room temperature ferromagnetism was observed for both Fe and Ni doped ZnO. Fe doped ZnO present a high saturation magnetization compared to Ni doped ZnO. However, Ni doped ZnO present high coercivity. The research was confirmed that Fe doped ZnO material will be good material combination for spintronic applications.

Local structure investigation of (Co, Cu) co-doped ZnO nanocrystals and its correlation with magnetic properties

2016 ◽  
Vol 90 ◽  
pp. 100-113 ◽  
Author(s):  
N. Tiwari ◽  
S. Doke ◽  
A. Lohar ◽  
Shailaja Mahamuni ◽  
C. Kamal ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Local Structure ◽  
Structure Investigation ◽  
Zno Nanocrystals ◽  
Doped Zno ◽  
Co Doped

Correlation of structural and magnetic properties of Ni-doped ZnO nanocrystals

2013 ◽  
Vol 47 (4) ◽  
pp. 045308 ◽  
Author(s):  
Deepak More ◽  
Chinmay Phadnis ◽  
Sohini Basu ◽  
Arjun Pathak ◽  
Igor Dubenko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Zno Nanocrystals ◽  
Structural And Magnetic Properties ◽  
Doped Zno

Containing Manganese DMSs Nanostructures via a Nonaqueous Route

2009 ◽  
Vol 79-82 ◽  
pp. 533-536 ◽  
Author(s):  
Yu Liang Zhang ◽  
Xiao Feng Li
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Wurtzite Structure ◽  
Epr Spectra ◽  
G Factor ◽  
Characterization Techniques ◽  
Zno Nanocrystals ◽  
Doped Zno

The structure and the magnetic properties of 3.0 and 0.3 at.% Mn-containing ZnO-based DMSs, synthesized by a straightforward and experimentally simple nonaqueous route, have been investigated by various characterization techniques, including XRD, HRTEM, and EPR. The as-synthesized doped ZnO nanocrystals retain the wurtzite structure with a morphology in the form of flower-like shape. EPR spectra with g-factor values of 2.0023(3% at.%) and 2.0019(0.3 at.%), respectively, at room temperature were obtained, confirming that the Mn2+ is substitutionally incorporated into the ZnO nanocrystals.

scholarly journals Transition Metals Doped Nanocrystals: Synthesis, Characterization, and Applications

2021 ◽  
Author(s):  
Anielle C.A. Silva ◽  
Jerusa M. de Oliveira ◽  
Luciana R.S. Floresta ◽  
Matheus V. da Silva ◽  
José L. da S. Duarte ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Metals ◽  
Crystalline Structure ◽  
Strong Interaction ◽  
Charge Carriers ◽  
Cdte Quantum Dots ◽  
Doped Zno ◽  
Unpaired Electrons ◽  
Glass Matrices

Doping is a technique that makes it possible to incorporate substitutional ions into the crystalline structure of materials, generating exciting properties. This book chapter will comment on the transition metals (TM) doped nanocrystals (NCs) and how doping and concentration influence applications and biocompatibility. In the NCs doped with TM, there is a strong interaction of sp-d exchange between the NCs’ charge carriers and the unpaired electrons of the MT, generating new and exciting properties. These doped NCs can be nanopowders or be embedded in glass matrices, depending on the application of interest. Therefore, we show the group results of synthesis, characterization, and applications of iron or copper-doped ZnO nanopowders and chromium-doped Bi2S3, nickel-doped ZnTe, and manganese-doped CdTe quantum dots in the glass matrices.

Chemical Synthesis and Structural and Magnetic Properties of Dispersible Cobalt- and Nickel-Doped ZnO Nanocrystals

2010 ◽  
Vol 114 (8) ◽  
pp. 3422-3430 ◽  
Author(s):  
Anshu Singhal ◽  
S. N. Achary ◽  
J. Manjanna ◽  
S. Chatterjee ◽  
P. Ayyub ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Chemical Synthesis ◽  
Zno Nanocrystals ◽  
Structural And Magnetic Properties ◽  
Doped Zno ◽  
Cobalt And Nickel

Local Structure Investigation of Cobalt and Manganese Doped ZnO Nanocrystals and Its Correlation with Magnetic Properties

2014 ◽  
Vol 118 (17) ◽  
pp. 9154-9164 ◽  
Author(s):  
S. Basu ◽  
D. Y. Inamdar ◽  
Shailaja Mahamuni ◽  
Aparna Chakrabarti ◽  
C. Kamal ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Local Structure ◽  
Structure Investigation ◽  
Zno Nanocrystals ◽  
Doped Zno
Sign in / Sign up

Export Citation Format

Share Document