Abstract
A new approach to develop highly ordered magnetite (Fe3O 4) nanoparticle-patterned nanohole arrays with desirable magnetic properties for a variety of technological applications is presented. In this work, the sub-100 nm nanohole arrays are successfully fabricated from a pre-ceramic polymer mold using spin-on nanoprinting (SNAP). These nanoholes a then filled with monodispersed, spherical Fe3O4 nanoparticles of about 10 nm diameter using a novel magnetic drag and drop procedure. The nanohole arrays filled with magnetic nanoparticles a imaged using magnetic force microscopy (MFM). Magnetometry and MFM measurements reveal room temperature ferromagnetism in the Fe3O4-filled nanohole arrays, while the as-synthesized Fe3O4 nanoparticles exhibit superparamagnetic behavior. As revealed by MFM measurements, the enhanced magnetism in the Fe3O4-filled nanohole arrays originates mainly from the enhanced magnetic dipole interactions of Fe 3O4 nanoparticles within the nanoholes and between adjacent nanoholes. Nanoparticle filled nanohole arrays can be highly beneficial in magnetic data storage and other applications such as microwave devices and biosensor arrays that require tunable and anisotropic magnetic properties.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2840-2848 |
| Number of pages | 9 |
| Journal | Small |
| Volume | 10 |
| Issue number | 14 |
| DOIs | |
| State | Published - Jul 23 2014 |
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Keywords
- magnetic force microscopy
- magnetometry
- nanohole arrays
- nanoimprinting
- SNAP
ASJC Scopus subject areas
- Biomaterials
- Engineering (miscellaneous)
- Biotechnology
Cite this
Enhanced magnetism in highly ordered magnetite nanoparticle-filled nanohole arrays. / Duong, Binh; Khurshid, Hafsa; Gangopadhyay, Palash; Devkota, Jagannath; Stojak, Kristen; Srikanth, Hariharan; Tetard, Laurene; Norwood, Robert A; Peyghambarian, Nasser N; Phan, Manh Huong; Thomas, Jayan.
In: Small, Vol. 10, No. 14, 23.07.2014, p. 2840-2848.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Enhanced magnetism in highly ordered magnetite nanoparticle-filled nanohole arrays
AU - Duong, Binh
AU - Khurshid, Hafsa
AU - Gangopadhyay, Palash
AU - Devkota, Jagannath
AU - Stojak, Kristen
AU - Srikanth, Hariharan
AU - Tetard, Laurene
AU - Norwood, Robert A
AU - Peyghambarian, Nasser N
AU - Phan, Manh Huong
AU - Thomas, Jayan
PY - 2014/7/23
Y1 - 2014/7/23
N2 - A new approach to develop highly ordered magnetite (Fe3O 4) nanoparticle-patterned nanohole arrays with desirable magnetic properties for a variety of technological applications is presented. In this work, the sub-100 nm nanohole arrays are successfully fabricated from a pre-ceramic polymer mold using spin-on nanoprinting (SNAP). These nanoholes a then filled with monodispersed, spherical Fe3O4 nanoparticles of about 10 nm diameter using a novel magnetic drag and drop procedure. The nanohole arrays filled with magnetic nanoparticles a imaged using magnetic force microscopy (MFM). Magnetometry and MFM measurements reveal room temperature ferromagnetism in the Fe3O4-filled nanohole arrays, while the as-synthesized Fe3O4 nanoparticles exhibit superparamagnetic behavior. As revealed by MFM measurements, the enhanced magnetism in the Fe3O4-filled nanohole arrays originates mainly from the enhanced magnetic dipole interactions of Fe 3O4 nanoparticles within the nanoholes and between adjacent nanoholes. Nanoparticle filled nanohole arrays can be highly beneficial in magnetic data storage and other applications such as microwave devices and biosensor arrays that require tunable and anisotropic magnetic properties.
AB - A new approach to develop highly ordered magnetite (Fe3O 4) nanoparticle-patterned nanohole arrays with desirable magnetic properties for a variety of technological applications is presented. In this work, the sub-100 nm nanohole arrays are successfully fabricated from a pre-ceramic polymer mold using spin-on nanoprinting (SNAP). These nanoholes a then filled with monodispersed, spherical Fe3O4 nanoparticles of about 10 nm diameter using a novel magnetic drag and drop procedure. The nanohole arrays filled with magnetic nanoparticles a imaged using magnetic force microscopy (MFM). Magnetometry and MFM measurements reveal room temperature ferromagnetism in the Fe3O4-filled nanohole arrays, while the as-synthesized Fe3O4 nanoparticles exhibit superparamagnetic behavior. As revealed by MFM measurements, the enhanced magnetism in the Fe3O4-filled nanohole arrays originates mainly from the enhanced magnetic dipole interactions of Fe 3O4 nanoparticles within the nanoholes and between adjacent nanoholes. Nanoparticle filled nanohole arrays can be highly beneficial in magnetic data storage and other applications such as microwave devices and biosensor arrays that require tunable and anisotropic magnetic properties.
KW - magnetic force microscopy
KW - magnetometry
KW - nanohole arrays
KW - nanoimprinting
KW - SNAP
UR - http://www.scopus.com/inward/record.url?scp=84904428335&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84904428335&partnerID=8YFLogxK
U2 - 10.1002/smll.201303809
DO - 10.1002/smll.201303809
M3 - Article
AN - SCOPUS:84904428335
VL - 10
SP - 2840
EP - 2848
JO - Small
JF - Small
SN - 1613-6810
IS - 14
ER -