Nanostructured Bimetallic Block Copolymers as Precursors to Magnetic FePt Nanoparticles

Sze Chun Yiu; Adam Nunns; Cheuk Lam HO; Jenner Ho Loong Ngai; Zhengong Meng; Guijun Li; Jessica Gwyther; George R. Whittell; Ian Manners; Wai Yeung WONG

doi:10.1021/acs.macromol.9b00088

Nanostructured Bimetallic Block Copolymers as Precursors to Magnetic FePt Nanoparticles

Sze Chun Yiu, Adam Nunns, Cheuk Lam HO^*, Jenner Ho Loong Ngai, Zhengong Meng, Guijun Li, Jessica Gwyther, George R. Whittell, Ian Manners, Wai Yeung WONG

^*Corresponding author for this work

Department of Chemistry

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

17 Citations (Scopus)

Abstract

Phase-separated block copolymers (BCPs) that function as precursors to arrays of FePt nanoparticles (NPs) are of potential interest for the creation of media for the next-generation high-density magnetic data storage devices. A series of bimetallic BCPs has been synthesized by incorporating a complex containing Fe and Pt centers into the coordinating block of four different poly(styrene-b-4-vinylpyridine)s (PS-b-P4VPs, P1-P4). To facilitate phase separation for the resulting metalated BCPs (PM1-PM4), a loading of the FePt-bimetallic complex corresponding to ca. 20% was used. The bulk and thin-film self-assembly of these BCPs was studied by transmission electron microscopy (TEM) and atomic force microscopy, respectively. The spherical and cylindrical morphologies observed for the metalated BCPs corresponded to those observed for the metal-free BCPs. The products from the pyrolysis of the BCPs in bulk were also characterized by TEM, powder X-ray diffraction, and energy-dispersive X-ray spectroscopy, which indicated that the FePt NPs formed exist in an fct phase with average particle sizes of ca. 4-8 nm within a carbonaceous matrix. A comparison of the pyrolysis behavior of the metalated BCP (PM3), the metalated P4VP homopolymer (PM5), and the molecular model organometallic complex revealed the importance of using a nanostructured BCP approach for the synthesis of ferromagnetic FePt NPs with a smaller average NP size and a close to 1:1 Fe/Pt stoichiometric ratio.

Original language	English
Pages (from-to)	3176-3186
Number of pages	11
Journal	Macromolecules
Volume	52
Issue number	9
DOIs	https://doi.org/10.1021/acs.macromol.9b00088
Publication status	Published - 14 May 2019

Scopus Subject Areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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@article{e565dd90cea34ce39fd0c2626dac6f1f,

title = "Nanostructured Bimetallic Block Copolymers as Precursors to Magnetic FePt Nanoparticles",

abstract = "Phase-separated block copolymers (BCPs) that function as precursors to arrays of FePt nanoparticles (NPs) are of potential interest for the creation of media for the next-generation high-density magnetic data storage devices. A series of bimetallic BCPs has been synthesized by incorporating a complex containing Fe and Pt centers into the coordinating block of four different poly(styrene-b-4-vinylpyridine)s (PS-b-P4VPs, P1-P4). To facilitate phase separation for the resulting metalated BCPs (PM1-PM4), a loading of the FePt-bimetallic complex corresponding to ca. 20% was used. The bulk and thin-film self-assembly of these BCPs was studied by transmission electron microscopy (TEM) and atomic force microscopy, respectively. The spherical and cylindrical morphologies observed for the metalated BCPs corresponded to those observed for the metal-free BCPs. The products from the pyrolysis of the BCPs in bulk were also characterized by TEM, powder X-ray diffraction, and energy-dispersive X-ray spectroscopy, which indicated that the FePt NPs formed exist in an fct phase with average particle sizes of ca. 4-8 nm within a carbonaceous matrix. A comparison of the pyrolysis behavior of the metalated BCP (PM3), the metalated P4VP homopolymer (PM5), and the molecular model organometallic complex revealed the importance of using a nanostructured BCP approach for the synthesis of ferromagnetic FePt NPs with a smaller average NP size and a close to 1:1 Fe/Pt stoichiometric ratio.",

author = "Yiu, {Sze Chun} and Adam Nunns and HO, {Cheuk Lam} and Ngai, {Jenner Ho Loong} and Zhengong Meng and Guijun Li and Jessica Gwyther and Whittell, {George R.} and Ian Manners and WONG, {Wai Yeung}",

note = "Funding Information: W.-Y.W. acknowledges the financial support from the Hong Kong Research Grants Council (PolyU 153062/18P), Area of Excellence Scheme of HKSAR (AoE/P-03/08), Hong Kong Polytechnic University (1-ZE1C), and Clarea Au for the Endowed Professorship in Energy (847S). C.-L.H. thanks the Hong Kong Research Grants Council (PolyU 123021/17P), National Natural Science Foundation of China (21504074), the Science, Technology and Innovation Committee of Shenzhen Municipality (JCYJ20160531193836532), and the Hong Kong Polytechnic University (1-BE0Q and G-YBYZ) for their financial support. Z.M. thanks the National Natural Science Foundation of China (21701112) for financial support. I.M. thanks the Canadian Government for a Canada 150 Research Chair and the University of Bristol for support.",

year = "2019",

month = may,

day = "14",

doi = "10.1021/acs.macromol.9b00088",

language = "English",

volume = "52",

pages = "3176--3186",

journal = "Macromolecules",

issn = "0024-9297",

publisher = "American Chemical Society",

number = "9",

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T1 - Nanostructured Bimetallic Block Copolymers as Precursors to Magnetic FePt Nanoparticles

AU - Yiu, Sze Chun

AU - Nunns, Adam

AU - HO, Cheuk Lam

AU - Ngai, Jenner Ho Loong

AU - Meng, Zhengong

AU - Li, Guijun

AU - Gwyther, Jessica

AU - Whittell, George R.

AU - Manners, Ian

AU - WONG, Wai Yeung

N1 - Funding Information: W.-Y.W. acknowledges the financial support from the Hong Kong Research Grants Council (PolyU 153062/18P), Area of Excellence Scheme of HKSAR (AoE/P-03/08), Hong Kong Polytechnic University (1-ZE1C), and Clarea Au for the Endowed Professorship in Energy (847S). C.-L.H. thanks the Hong Kong Research Grants Council (PolyU 123021/17P), National Natural Science Foundation of China (21504074), the Science, Technology and Innovation Committee of Shenzhen Municipality (JCYJ20160531193836532), and the Hong Kong Polytechnic University (1-BE0Q and G-YBYZ) for their financial support. Z.M. thanks the National Natural Science Foundation of China (21701112) for financial support. I.M. thanks the Canadian Government for a Canada 150 Research Chair and the University of Bristol for support.

PY - 2019/5/14

Y1 - 2019/5/14

N2 - Phase-separated block copolymers (BCPs) that function as precursors to arrays of FePt nanoparticles (NPs) are of potential interest for the creation of media for the next-generation high-density magnetic data storage devices. A series of bimetallic BCPs has been synthesized by incorporating a complex containing Fe and Pt centers into the coordinating block of four different poly(styrene-b-4-vinylpyridine)s (PS-b-P4VPs, P1-P4). To facilitate phase separation for the resulting metalated BCPs (PM1-PM4), a loading of the FePt-bimetallic complex corresponding to ca. 20% was used. The bulk and thin-film self-assembly of these BCPs was studied by transmission electron microscopy (TEM) and atomic force microscopy, respectively. The spherical and cylindrical morphologies observed for the metalated BCPs corresponded to those observed for the metal-free BCPs. The products from the pyrolysis of the BCPs in bulk were also characterized by TEM, powder X-ray diffraction, and energy-dispersive X-ray spectroscopy, which indicated that the FePt NPs formed exist in an fct phase with average particle sizes of ca. 4-8 nm within a carbonaceous matrix. A comparison of the pyrolysis behavior of the metalated BCP (PM3), the metalated P4VP homopolymer (PM5), and the molecular model organometallic complex revealed the importance of using a nanostructured BCP approach for the synthesis of ferromagnetic FePt NPs with a smaller average NP size and a close to 1:1 Fe/Pt stoichiometric ratio.

AB - Phase-separated block copolymers (BCPs) that function as precursors to arrays of FePt nanoparticles (NPs) are of potential interest for the creation of media for the next-generation high-density magnetic data storage devices. A series of bimetallic BCPs has been synthesized by incorporating a complex containing Fe and Pt centers into the coordinating block of four different poly(styrene-b-4-vinylpyridine)s (PS-b-P4VPs, P1-P4). To facilitate phase separation for the resulting metalated BCPs (PM1-PM4), a loading of the FePt-bimetallic complex corresponding to ca. 20% was used. The bulk and thin-film self-assembly of these BCPs was studied by transmission electron microscopy (TEM) and atomic force microscopy, respectively. The spherical and cylindrical morphologies observed for the metalated BCPs corresponded to those observed for the metal-free BCPs. The products from the pyrolysis of the BCPs in bulk were also characterized by TEM, powder X-ray diffraction, and energy-dispersive X-ray spectroscopy, which indicated that the FePt NPs formed exist in an fct phase with average particle sizes of ca. 4-8 nm within a carbonaceous matrix. A comparison of the pyrolysis behavior of the metalated BCP (PM3), the metalated P4VP homopolymer (PM5), and the molecular model organometallic complex revealed the importance of using a nanostructured BCP approach for the synthesis of ferromagnetic FePt NPs with a smaller average NP size and a close to 1:1 Fe/Pt stoichiometric ratio.

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U2 - 10.1021/acs.macromol.9b00088

DO - 10.1021/acs.macromol.9b00088

M3 - Journal article

AN - SCOPUS:85064990648

SN - 0024-9297

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EP - 3186

JO - Macromolecules

JF - Macromolecules

IS - 9

ER -

Nanostructured Bimetallic Block Copolymers as Precursors to Magnetic FePt Nanoparticles

Abstract

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