NDLI: Thermal dewetting with a chemically heterogeneous nano-template for self-assembled L1<sub>0</sub> FePt nanoparticle arrays

Content Provider	Royal Society of Chemistry (RSC)
Author	Chen, Lih-Juann Liao, Jung-Wei Huang, Kuo-Feng Lai, Chih-Huang Lin, Tzu-Ying Wang, Liang-Wei Wang, Chiu-Yen Cheng, Chung-Fu Ho, Rong-Ming Wang, Ding-Shuo
Copyright Year	2016
Abstract	A design for the fabrication of metallic nanoparticles is presented by thermal dewetting with a chemically heterogeneous nano-template. For the template, we fabricate a nanostructured polystyrene-b-polydimethylsiloxane (PS-b-PDMS) film on a Si\|SiO2 substrate, followed by a thermal annealing and reactive ion etching (RIE) process. This gives a template composed of an ordered hexagonal array of SiOC hemispheres emerging in the polystyrene matrix. After the deposition of a FePt film on this template, we utilize the rapid thermal annealing (RTA) process, which provides in-plane stress, to achieve thermal dewetting and structural ordering of FePt simultaneously. Since the template is composed of different composition surfaces with periodically varied morphologies, it offers more tuning knobs to manipulate the nanostructures. We show that both the decrease in the area of the PS matrix and the increase in the strain energy relaxation transfer the dewetted pattern from the randomly distributed nanoparticles into a hexagonal periodic array of L10 FePt nanoparticles. Transmission electron microscopy with the in situ heating stage reveals the evolution of the dewetting process, and confirms that the positions of nanoparticles are aligned with those of the SiOC hemispheres. The nanoparticles formed by this template-dewetting show an average diameter and center-to-center distance of 19.30 ± 2.09 nm and 39.85 ± 4.80 nm, respectively. The hexagonal array of FePt nanoparticles reveals a large coercivity of 1.5 T, much larger than the nanoparticles fabricated by top-down approaches. This approach offers an efficient pathway toward self-assembled nanostructures in a wide range of material systems.
Starting Page	3926
Ending Page	3935
Page Count	10
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	8
Issue Number	7
Journal	Nanoscale
DOI	10.1039/c5nr08339g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Chemical milling Barcelona Metro line 10 Transmission electron microscopy Strain energy Ion Polystyrene RTA Composite material Nucleic acid thermodynamics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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