Synthesis and enhanced microwave properties of uniform hollow Fe nanospheres and their core–shell silica nanocomposites

Z. H. Yang; Z. W. Li; J. Zhao; Y. H. Yang

doi:10.1039/c3ra45142a

Synthesis and enhanced microwave properties of uniform hollow Fe nanospheres and their core–shell silica nanocomposites

Z. H. Yang^*, Z. W. Li, J. Zhao, Y. H. Yang^*

^*Corresponding author for this work

Department of Biology

Research output: Contribution to journal › Journal article › peer-review

19 Citations (Scopus)

Abstract

Monodispersed hollow magnetite nanospheres with diameter of about 462 nm and a shell thickness of approximately 90 nm were successfully synthesized through a simple solvothermal process in ethylene glycol (EG) in the presence of urea. The electron and transmission microscopy images showed that the obtained magnetite spheres are composed of small particles and confirmed their hollow interior. Furthermore, by annealing in an H₂ atmosphere, the crystalline structure is converted from fcc (Fe₃O₄) to bcc (Fe) which has been confirmed by X-ray diffraction (XRD) results. The M_s value of reduced samples (hollow Fe nanospheres) increases to 198 emu g⁻¹ which is mostly equal to that of bulk Fe. Relevant hollow Fe/SiO₂ core–shell nanospheres were prepared through a modified Stöber process. The enhanced microwave attenuation can be achieved for this core–shell nanospheres which is attributed to the improved electromagnetic impedance match and strong and broadband natural resonance at high frequency for the metal nanospheres.

Original language	English
Pages (from-to)	9457-9462
Number of pages	6
Journal	RSC Advances
Volume	4
Issue number	19
DOIs	https://doi.org/10.1039/c3ra45142a
Publication status	Published - Jan 2014

Scopus Subject Areas

Chemistry(all)
Chemical Engineering(all)

Access to Document

10.1039/c3ra45142a

Cite this

@article{3a5ba0e98d21485c81d09b70760146ed,

title = "Synthesis and enhanced microwave properties of uniform hollow Fe nanospheres and their core–shell silica nanocomposites",

abstract = "Monodispersed hollow magnetite nanospheres with diameter of about 462 nm and a shell thickness of approximately 90 nm were successfully synthesized through a simple solvothermal process in ethylene glycol (EG) in the presence of urea. The electron and transmission microscopy images showed that the obtained magnetite spheres are composed of small particles and confirmed their hollow interior. Furthermore, by annealing in an H2 atmosphere, the crystalline structure is converted from fcc (Fe3O4) to bcc (Fe) which has been confirmed by X-ray diffraction (XRD) results. The Ms value of reduced samples (hollow Fe nanospheres) increases to 198 emu g−1 which is mostly equal to that of bulk Fe. Relevant hollow Fe/SiO2 core–shell nanospheres were prepared through a modified St{\"o}ber process. The enhanced microwave attenuation can be achieved for this core–shell nanospheres which is attributed to the improved electromagnetic impedance match and strong and broadband natural resonance at high frequency for the metal nanospheres.",

author = "Yang, {Z. H.} and Li, {Z. W.} and J. Zhao and Yang, {Y. H.}",

note = "Publisher copyright: {\textcopyright} The Royal Society of Chemistry 2014",

year = "2014",

month = jan,

doi = "10.1039/c3ra45142a",

language = "English",

volume = "4",

pages = "9457--9462",

journal = "RSC Advances",

issn = "2046-2069",

publisher = "Royal Society of Chemistry",

number = "19",

}

TY - JOUR

T1 - Synthesis and enhanced microwave properties of uniform hollow Fe nanospheres and their core–shell silica nanocomposites

AU - Yang, Z. H.

AU - Li, Z. W.

AU - Zhao, J.

AU - Yang, Y. H.

PY - 2014/1

Y1 - 2014/1

N2 - Monodispersed hollow magnetite nanospheres with diameter of about 462 nm and a shell thickness of approximately 90 nm were successfully synthesized through a simple solvothermal process in ethylene glycol (EG) in the presence of urea. The electron and transmission microscopy images showed that the obtained magnetite spheres are composed of small particles and confirmed their hollow interior. Furthermore, by annealing in an H2 atmosphere, the crystalline structure is converted from fcc (Fe3O4) to bcc (Fe) which has been confirmed by X-ray diffraction (XRD) results. The Ms value of reduced samples (hollow Fe nanospheres) increases to 198 emu g−1 which is mostly equal to that of bulk Fe. Relevant hollow Fe/SiO2 core–shell nanospheres were prepared through a modified Stöber process. The enhanced microwave attenuation can be achieved for this core–shell nanospheres which is attributed to the improved electromagnetic impedance match and strong and broadband natural resonance at high frequency for the metal nanospheres.

AB - Monodispersed hollow magnetite nanospheres with diameter of about 462 nm and a shell thickness of approximately 90 nm were successfully synthesized through a simple solvothermal process in ethylene glycol (EG) in the presence of urea. The electron and transmission microscopy images showed that the obtained magnetite spheres are composed of small particles and confirmed their hollow interior. Furthermore, by annealing in an H2 atmosphere, the crystalline structure is converted from fcc (Fe3O4) to bcc (Fe) which has been confirmed by X-ray diffraction (XRD) results. The Ms value of reduced samples (hollow Fe nanospheres) increases to 198 emu g−1 which is mostly equal to that of bulk Fe. Relevant hollow Fe/SiO2 core–shell nanospheres were prepared through a modified Stöber process. The enhanced microwave attenuation can be achieved for this core–shell nanospheres which is attributed to the improved electromagnetic impedance match and strong and broadband natural resonance at high frequency for the metal nanospheres.

UR - http://www.scopus.com/inward/record.url?scp=84893930162&partnerID=8YFLogxK

U2 - 10.1039/c3ra45142a

DO - 10.1039/c3ra45142a

M3 - Journal article

AN - SCOPUS:84893930162

SN - 2046-2069

VL - 4

SP - 9457

EP - 9462

JO - RSC Advances

JF - RSC Advances

IS - 19

ER -

Synthesis and enhanced microwave properties of uniform hollow Fe nanospheres and their core–shell silica nanocomposites

Abstract

Scopus Subject Areas

Access to Document

Other files and links

Fingerprint

Cite this