2004
DOI: 10.1021/jp047602f
|View full text |Cite
|
Sign up to set email alerts
|

Analyzing the Structure of CoFe−Fe3O4 Core−Shell Nanoparticles by Electron Imaging and Diffraction

Abstract: Structure analysis of multifunctional nanoparticles could be a complex process. In this paper, we demonstrate the step-by-step techniques used for identifying the structure of the CoFe−Fe3O4 nanoparticles, which are composed of ∼4-nm CoFe cores and covered with ∼3-nm Fe3O4 polynanocrystallites. The techniques demonstrated are general and can be adopted for analysis of any nanoparticles of interest in physical chemistry.

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

2
38
0

Year Published

2006
2006
2018
2018

Publication Types

Select...
6
2
1

Relationship

1
8

Authors

Journals

citations
Cited by 72 publications
(40 citation statements)
references
References 9 publications
2
38
0
Order By: Relevance
“…As shown in Figure 4, the XRD pattern indicates that these Figure 3d, and the latter seven are very near to those for standard Fe 3 O 4 : 2.966, 2.53, 2.096, 1.712, 1.614, 1.483, and 1.279 Å. [41] Although small traces of maghemite or hematite cannot be totally ruled out by the XRD, SAED, or HRTEM characterization, these results identify that the iron oxide NPs are mostly of the magnetite cubic spinel phase. The size, calculated by the Sherra equation [42] from the identified XRD peaks, is 9.4 Ϯ 2.4 nm, almost the same as that observed from the TEM images.…”
Section: Resultsmentioning
confidence: 58%
“…As shown in Figure 4, the XRD pattern indicates that these Figure 3d, and the latter seven are very near to those for standard Fe 3 O 4 : 2.966, 2.53, 2.096, 1.712, 1.614, 1.483, and 1.279 Å. [41] Although small traces of maghemite or hematite cannot be totally ruled out by the XRD, SAED, or HRTEM characterization, these results identify that the iron oxide NPs are mostly of the magnetite cubic spinel phase. The size, calculated by the Sherra equation [42] from the identified XRD peaks, is 9.4 Ϯ 2.4 nm, almost the same as that observed from the TEM images.…”
Section: Resultsmentioning
confidence: 58%
“…[48,49] For example, biocompatible Me@Fe 2 O 3 HNCs (where Me = Co or SmCo 5.2 ) have been conjugated by robust dopamine bridging to nitrilotriacetic acid, which possesses high specificity for separating histidine-tagged proteins. [48] CoFe 2 O 4 NCs have been used as seed substrates to be coated with a Fe 3 O 4 layer; however, the product has been demonstrated to be CoFe@Fe 3 O 4 HNCs.…”
Section: Direct Heterogeneous Nucleation and Growth Of The Shellmentioning
confidence: 99%
“…[48] CoFe 2 O 4 NCs have been used as seed substrates to be coated with a Fe 3 O 4 layer; however, the product has been demonstrated to be CoFe@Fe 3 O 4 HNCs. [49] Although their formation mechanism has not been clarified, this work offers an accurate description of a step-by-step methodology to achieve in-depth structural and compositional information on core@shell nanostructures, which becomes an undoubtedly challenging task when the shell is either polycrystalline or shares an incoherent or lattice-mismatched interface with the core.…”
Section: Direct Heterogeneous Nucleation and Growth Of The Shellmentioning
confidence: 99%
“…These can be attributed to the <311> and <220> planes, respectively, of the two inverse spinel structures of iron oxide, Fe 3 O 4 and its Fe(II)-deficient analogue, [43] γ-Fe 2 O 3 (Table S2, Supporting Information). [49] This lattice fringe analysis argues against the presence of α-Fe 2 O 3 . [50] However, whilst it is established that Fe 3 O 4 is the preferentially formed oxide under mild (atmospheric) oxidizing conditions, [51] such as those used in this work, HRTEM cannot distinguish between Fe 3 O 4 and γ-Fe 2 O 3 .…”
Section: Direct Formation Of Fe@fe 3 O 4 Npsmentioning
confidence: 95%