Synthesis and characterization of carbon-coated iron core/shell nanostructures

2008 ◽  
Vol 448 (1-2) ◽  
pp. 272-276 ◽  
Author(s):  
Hongming Cao ◽  
Guangjian Huang ◽  
Shaofeng Xuan ◽  
Qiufang Wu ◽  
Feng Gu ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Iron Core ◽  
Core Shell ◽  
Shell Nanostructures ◽  
Carbon Coated

scholarly journals Structural characterization of self-assembled chain like Fe-FeOx Core shell nanostructure

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Aiman Mukhtar ◽  
Xiao-Ming Cao ◽  
Tahir Mehmood ◽  
Da-shuang Wang ◽  
Kai-ming Wu
Keyword(s):  
Water Oxidation ◽  
Oxide Shell ◽  
Iron Core ◽  
Core Shell ◽  
Shell Nanostructures ◽  
Hematite Phase ◽  
Magnetic Resonance Imaging Mri ◽  
Near Future ◽  
Magnetite Phase

Abstract One of the big challenge of studying the core-shell iron nanostructures is to know the nature of oxide shell, i.e., whether it is γ-Fe2O3 (Maghemite), Fe3O4 (Magnetite), α-Fe2O3 (Hematite), or FeO (Wustite). By knowing the nature of iron oxide shell with zero valent iron core, one can determine the chemical or physical behavior of core-shell nanostructures. Fe core-shell nanochains (NCs) were prepared through the reduction of Fe3+ ions by sodium boro-hydride in aqueous solution at room atmosphere, and Fe NCs were further aged in water up to 240 min. XRD was used to study the structure of Fe NCs. Further analysis of core-shell nature of Fe NCs was done by TEM, results showed increase in thickness of oxide shell (from 2.5, 4, 6 to 10 nm) as water aging time increases (from 0 min, 120 min, 240 min to 360 min). The Raman spectroscopy was employed to study the oxide nature of Fe NCs. To further confirm the magnetite phase in Fe NCs, the Mössbauer spectroscopy was done on Fe NCs-0 and Fe NCs-6. Result shows the presence of magnetite in the sample before aging in water, and the sample after prolonged aging contains pure Hematite phase. It shows that prolonged water oxidation transforms the structure of shell of Fe NCs from mixture of Hematite and Magnetite in to pure hematite shell. The Magnetic properties of the Fe NCs were measured by VSM at 320 K. Because of high saturation magnetization (Ms) values, Fe NCs could be used as r2 contrasts agents for magnetic resonance imaging (MRI) in near future.

scholarly journals Synthesis and characterization of silica–lead sulfide core–shell nanospheres for applications in optoelectronic devices

2021 ◽  
Author(s):  
A. K. Romero-Jaime ◽  
M. C. Acosta-Enríquez ◽  
D. Vargas-Hernández ◽  
J. C. Tánori-Córdova ◽  
H. A. Pineda León ◽  
...  
Keyword(s):  
Lead Sulfide ◽  
Optoelectronic Devices ◽  
Synthesis And Characterization ◽  
Core Shell
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