Formation of a Cobalt Magnetic Dot Array via Block Copolymer Lithography

Cheng, Joy Y.; Ross, Caroline A.; Chan, Vanessa Z.-H.; Thomas, Edwin L.; Lammertink, Rob G.H.; Vancso, Gyula J.

doi:10.1002/1521-4095(200108)13:15<1174::aid-adma1174>3.0.co;2-q

Cited by 652 publications

(510 citation statements)

References 7 publications

(9 reference statements)

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“…In bulk, due to thermodynamically incompatible and chemically immiscible blocks balance the entropic and enthalpic driven phase separation and the chemical bond constraints between the blocks driven the formation of ordered domains on nanometer features [1][2][3][4][5][6][7]. Nanoscale features with high precision and their rising demand for nanoscale fabrication methods, combined with the inherent feature-size limitations of optical lithography and the low throughput of electronbeam lithography, have motivated a search for cost-effective nanoscale fabrication technologies, including nanoimprint lithography [8], dippen nanolithography [9], and self-assembled block copolymer lithography [10][11][12][13][14]. For such nanostructured materials to be useful in thin-film applications, it should produce periodic arrays over a large area with uniform thickness and well-ordered BCP microdomains.…”

Section: Block Copolymers In Nanoscience and Nanotechnologymentioning

confidence: 99%

Formation of sub-7 nm feature size PS-b-P4VP block copolymer structures by solvent vapour process

et al. 2014

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The nanometer range structure produced by thin films of diblock copolymers makes them a great of interest as templates for the microelectronics industry. We investigated the effect of annealing solvents and/or mixture of the solvents in case of symmetric Poly (styrene-block-4vinylpyridine) (PS-b-P4VP) diblock copolymer to get the desired line patterns. In this paper, we used different molecular weights PS-b-P4VP to demonstrate the scalability of such high χ BCP system which requires precise fine-tuning of interfacial energies achieved by surface treatment and that improves the wetting property, ordering, and minimizes defect densities. Bare Silicon Substrates were also modified with polystyrene brush and ethylene glycol self-assembled monolayer in a simple quick reproducible way. Also, a novel and simple in situ hard mask technique was used to generate sub-7nm Iron oxide nanowires with a high aspect ratio on Silicon substrate, which can be used to develop silicon nanowires post pattern transfer

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Section: Block Copolymers In Nanoscience and Nanotechnologymentioning

confidence: 99%

Formation of sub-7 nm feature size PS-b-P4VP block copolymer structures by solvent vapour process

et al. 2014

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“…Confinement of magnetic species to the nanometre regime is known to enhance the magnetic properties 13 . The use of block copolymers (BCPs) to assemble nanoscopic elements with high density 17,18 (1 to 10 Terabits per square inch) is established, and attempts to exploit BCP templates to organize magnetic components has received considerable attention in the last two decades 19,20 . Although many strategies exist, they can be classified broadly into three different approaches that capitalize on the inherent nanoscopic order of the BCP.…”

mentioning

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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“…The normalized room-temperature hysteresis loops measured both on bare and Au-coated Ni 80 Fe 20 NDs still attached on the substrate and subsequently dispersed in water are shown in figure 3. As expected, the magnetization reversal of bare-NDs (black and green circles, respectively, for attached (figure 3a) and water-dispersed (figure 3b) discs) is typical of a magnetic vortex behaviour [24,30].…”

Section: Resultsmentioning

confidence: 99%

“…In particular, in this paper, a comparative cytotoxicity study of Au-coated and bare Ni 80 Fe 20 NDs at different concentrations has been performed on HT-29 human colorectal adenocarcinoma cells. Subsequently, a functionalization of gold surface of coated NDs was performed with a cysteine-fluorescein isothiocyanate (FITC) derivative in order to induce a random fluorescence and use them to evaluate the intracellular uptake.…”

Section: Introductionmentioning

confidence: 99%

Surface modification and cellular uptake evaluation of Au-coated Ni ₈₀ Fe ₂₀ nanodiscs for biomedical applications

Barrera¹,

Serpe

Celegato³

et al. 2016

Interface Focus.

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A nanofabrication technique based on self-assembling of polystyrene nanospheres is used to obtain magnetic Ni 80 Fe 20 nanoparticles with a disc shape. The free-standing nanodiscs (NDs) have diameter and thickness of about 630 nm and 30 nm, respectively. The versatility of fabrication technique allows one to cover the ND surface with a protective gold layer with a thickness of about 5 nm. Magnetization reversal has been studied by room-temperature hysteresis loop measurements in water-dispersed free-standing NDs. The reversal shows zero remanence, high susceptibility and nucleation/annihilation fields due to spin vortex formation. In order to investigate their potential use in biomedical applications, the effect of NDs coated with or without the protective gold layer on cell growth has been evaluated. A successful attempt to bind cysteine-fluorescein isothiocyanate (FITC) derivative to the gold surface of magnetic NDs has been exploited to verify the intracellular uptake of the NDs by cytofluorimetric analysis using the FITC conjugate.

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Formation of a Cobalt Magnetic Dot Array via Block Copolymer Lithography

Cited by 652 publications

References 7 publications

Formation of sub-7 nm feature size PS-b-P4VP block copolymer structures by solvent vapour process

Formation of sub-7 nm feature size PS-b-P4VP block copolymer structures by solvent vapour process

Room temperature magnetic materials from nanostructured diblock copolymers

Surface modification and cellular uptake evaluation of Au-coated Ni ₈₀ Fe ₂₀ nanodiscs for biomedical applications

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Formation of a Cobalt Magnetic Dot Array via Block Copolymer Lithography

Cited by 652 publications

References 7 publications

Formation of sub-7 nm feature size PS-b-P4VP block copolymer structures by solvent vapour process

Formation of sub-7 nm feature size PS-b-P4VP block copolymer structures by solvent vapour process

Room temperature magnetic materials from nanostructured diblock copolymers

Surface modification and cellular uptake evaluation of Au-coated Ni 80 Fe 20 nanodiscs for biomedical applications

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Product

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Surface modification and cellular uptake evaluation of Au-coated Ni ₈₀ Fe ₂₀ nanodiscs for biomedical applications