High-Throughput Directed Self-Assembly of Core鈥揝hell Ferrimagnetic Nanoparticle Arrays

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• 作者：Qiu Dai ; Jane Frommer ; David Berman ; Kumar Virwani ; Blake Davis ; Joy Y. Cheng ; Alshakim Nelson
• 刊名：Langmuir
• 出版年：2013
• 出版时间：June 18, 2013
• 年：2013
• 卷：29
• 期：24
• 页码：7472-7477
• 全文大小：386K
• 年卷期：v.29,no.24(June 18, 2013)
• ISSN：1520-5827

文摘

Magnetic nanoparticles (MNPs) provide a set of building blocks for constructing stimuli-responsive nanoscale materials with properties that are unique to this scale. The size and the composition of MNPs are tunable to meet the requirements for a range of applications including biosensors and data storage. Although many of these technologies would significantly benefit from the organization of nanoparticles into higher-order architectures, the precise placement and arrangement of nanoparticles over large areas of a surface remain a challenge. Herein, we demonstrate the viability of magnetic nanoparticles for patterned recording media utilizing a template-directed self-assembly process to afford well-defined nanostructures of magnetic nanoparticles and access these assemblies using magnetic force microscopy and a magnetic recording head. Photolithographically defined holes were utilized as templates to form assemblies of ferrimagnetic nanoparticle rings or pillars selectively over a large area (>1 cm²) in just 30 s. This approach is applicable to other nanoparticle systems as well and enables their high-throughput self-assembly for future advanced device fabrication.