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Nanoimprint Lithography-Directed Self-Assembly of Bimetallic Iron–M (M=Palladium,Platinum) Complexes for Magnetic Patterning |
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| Authors: | Dr Zhengong Meng Dr Guijun Li Dr Sze-Chun Yiu Dr Nianyong Zhu Prof Dr Zhen-Qiang Yu Dr Chi-Wah Leung Prof Dr Ian Manners Prof Dr Wai-Yeung Wong |
| Institution: | 1. Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China
College of Chemistry and Environmental Engineering, Low-dimensional Materials Genome Initiative, Shenzhen University, Xueyuan Road, Shenzhen, Guangdong, P. R. China;2. State Key Laboratory of Ultra-Precision Machining Technology and Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China;3. Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University (PolyU), Hung Hom, Hong Kong, P. R. China PolyU Shenzhen Research Institute, Shenzhen, 518057 P. R. China;4. Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China;5. College of Chemistry and Environmental Engineering, Low-dimensional Materials Genome Initiative, Shenzhen University, Xueyuan Road, Shenzhen, Guangdong, P. R. China;6. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China;7. Department of Chemistry, University of Victoria, Victoria, BC, V8P 5C2 Canada |
| Abstract: | Self-assembly of d8 metal polypyridine systems is a well-established approach for the creation of 1D organometallic assemblies but there are still challenges for the large-scale construction of nanostructured patterns from these building blocks. We describe herein the use of high-throughput nanoimprint lithography (NIL) to direct the self-assembly of the bimetallic complexes 4′-ferrocenyl-(2,2′:6′,2′′-terpyridine)M(OAc)]+(OAc)− (M=Pd or Pt; OAc=acetate). Uniform nanorods are fabricated from the molecular self-organization and evidenced by morphological characterization. More importantly, when top-down NIL is coupled with the bottom-up self-assembly of the organometallic building blocks, regular arrays of nanorods can be accessed and the patterns can be controlled by changing the lithographic stamp, where the mold imposes a confinement effect on the nanorod growth. In addition, patterns consisting of the products formed after pyrolysis are studied. The resulting arrays of ferromagnetic FeM alloy nanorods suggest promising potential for the scalable production of ordered magnetic arrays and fabrication of magnetic bit-patterned media. |
| Keywords: | bimetallic complexes magnetic nanoparticles nanoimprint lithography nanorods self-assembly |