Nanostructured Magnetic Thin Films from Organometallic Block Copolymers: Pyrolysis of Self-Assembled Polystyrene-<i>block</i>-poly(ferrocenylethylmethylsilane)

Rider, David A.; Liu, Kun; Eloi, Jean‐Charles; Vanderark, Lawrence; Yang, Ling; Wang, Jiayu; Grozea, D.; Lu, Zheng‐Hong; Russell, Thomas P.; Manners, Ian

doi:10.1021/nn7002629

Cited by 125 publications

(103 citation statements)

References 60 publications

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“…Several approaches have been used to manipulate the orientation of copolymer microdomains, including electric fields 17,18 , solvent fields [19][20][21][22] , chemically patterned substrates 23 , thermal gradients 24 , shear [25][26][27][28][29] , and AFM tips [30][31][32][33][34][35] .…”

Section: Introductionmentioning

confidence: 99%

Orientation Control and Crystallization in a Soft Confined Phase Separated Block Copolymer

Alharbe

Hobbs

2017

Macromolecules

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Phone: +44 (0)114 22 24532Fax: +44 (0)114 22 23555 ABSTRACTMicrodomain orientation and crystallization were examined in a crystalline-amorphous diblock copolymer, hydrogenated poly (high-1,4-butadiene)-b-poly(high-3,4-isoprene) (E/MB), which forms cylinders of the crystallizable block (polyethylene, E). Atomic force microscopy (AFM) was used to locally control the orientation of the E cylinders. The orientation process and subsequent crystallization behavior were investigated in situ as a function of temperature by AFM. Fully confined crystallization was observed within the range of 25-50 °C, with templated and breakout crystallization observed at higher crystallization temperature. The growth rate of templated crystallization along and perpendicular to the existing microdomain structure was measured and the ratio between these rates found to increase rapidly with decreasing temperature with a change from ~4.8 at 100 °C to ~8 at 97 °C. Two maxima in the degree of orientation of the crystallized regions were found, one at relatively small supercoolings (e.g. 95 °C) where the differential in growth rate along and across microdomain boundaries is high, and one at high supercoolings (25-50 °C) where crystallization is completely dominated by nucleation.

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Section: Introductionmentioning

confidence: 99%

Orientation Control and Crystallization in a Soft Confined Phase Separated Block Copolymer

Alharbe

Hobbs

2017

Macromolecules

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“…A third approach involves the incorporation of magnetic precursors directly into the chemical structure of the BCP. Pyrolysis has been typically used to convert the precursors into the corresponding magnetic material [25][26][27] . However, this results in a destruction of the nanostructured morphology.…”

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confidence: 99%

Room temperature magnetic materials from nanostructured diblock copolymers

et al. 2011

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nanostructured magnetic materials are important for many advanced applications. Consequently, new methods for their fabrication are critical. However, coupling self-assembly to the generation of magnetic materials in a simple, straight-forward manner has remained elusive. Although several approaches have been considered, most have multiple processing steps, thus diminishing their use of self-assembly to influence magnetic properties. Here we develop novel block copolymers that are preprogrammed with the necessary chemical information to microphase separate and deliver room temperature ferromagnetic properties following a simple heat treatment. The importance of the nanostructured confinement is demonstrated by comparison with the parent homopolymer, which provides only paramagnetic materials, even though it is chemically identical and has a higher loading of the magnetic precursor. In addition to the room temperature ferromagnetic properties originating from the block copolymer, the in situ generation densely functionalizes the surface of the magnetic elements, rendering them oxidatively stable.

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“…Crosslinking of the PS using UV-light followed by pyrolysis at 600 °C afforded arrays of magnetic ceramic cylinders that were characterised by magnetic force microscopy. 308 A PS-b-PFiPMS BCP has been used to prepare wire grid polarisers with extremely high aspect ratios over cm 2 areas. 309 Firstly, an amorphous layer of silicon (α-Si) was deposited onto a fused silica substrate by plasma-enhanced chemical vapour deposition (PECVD).…”

Section: Pfs Bcp Thin Films For Nanolithography and Nanotemplatingmentioning

confidence: 99%

Synthesis and Solution Self‐Assembly of Polyisoprene‐block‐poly(ferrocenylmethylsilane): A Diblock Copolymer with an Atactic but Semicrystalline Core‐Forming Metalloblock

Qiu

Winnik

et al. 2016

Macro Chemistry & Physics

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Nanostructured Magnetic Thin Films from Organometallic Block Copolymers: Pyrolysis of Self-Assembled Polystyrene-block-poly(ferrocenylethylmethylsilane)

Cited by 125 publications

References 60 publications

Orientation Control and Crystallization in a Soft Confined Phase Separated Block Copolymer

Orientation Control and Crystallization in a Soft Confined Phase Separated Block Copolymer

Room temperature magnetic materials from nanostructured diblock copolymers

Synthesis and Solution Self‐Assembly of Polyisoprene‐block‐poly(ferrocenylmethylsilane): A Diblock Copolymer with an Atactic but Semicrystalline Core‐Forming Metalloblock

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