期刊
CHEMICAL SCIENCE
卷 4, 期 5, 页码 2093-2099出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3sc50423a
关键词
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资金
- DARPA/MTO Award [N66001-08-1-2044]
- AOARD Award [FA2386-10-1-4065]
- AFOSR [FA9550-12-1-0141, FA9550-12-1-0280, FA-9550-11-1-0275]
- NSF [DBI-1152139, DMB-1124131]
- DoD/NPS/NSSEF Fellowship Awards [N00244-09-1-0012, N00244-09-1-0071]
- UOP-Honeywell
- Chicago Biomedical Consortium
- Searle Funds at The Chicago Community Trust
- NERC an Energy Frontier Research Center
- DoE/Office of Science/Office of Basic Energy Sciences Award [DE-SC0000989]
- Indo-US Science & Technology Forum (IUSSTF)
- Northwestern University's International Institute for Nanotechnology
- NIH (NCI CCNE Grant) [C54CA151880]
- NATIONAL CANCER INSTITUTE [U54CA151880] Funding Source: NIH RePORTER
Understanding how ink transfers to a surface in dip-pen nanolithography (DPN) is crucial for designing new ink materials and developing the processes to pattern them. Herein, we investigate the transport of block copolymer inks with varying viscosities, from an atomic force microscope (AFM) tip to a substrate. The size of the patterned block copolymer features was determined to increase with dwell time and decrease with ink viscosity. A mass transfer model is proposed to describe this behaviour, which is fundamentally different from small molecule transport mechanisms due to entanglement of the polymeric chains. The fundamental understanding developed here provides mechanistic insight into the transport of large polymer molecules, and highlights the importance of ink viscosity in controlling the DPN process. Given the ubiquity of polymeric materials in semiconducting nanofabrication, organic electronics, and bioengineering applications, this study could provide an avenue for DPN to expand its role in these fields.
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