Molecular flux dependence of chemical patterning by microcontact printing
| Autor: | Elizabeth I. Morin, Jeffrey J. Schwartz, Paul S. Weiss, J. Nathan Hohman |
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| Rok vydání: | 2013 |
| Předmět: |
microdisplacement printing
microcontact printing Materials science nanoscale patterning Scanning electron microscope Diffusion Nanotechnology Substrate (printing) Macromolecular and Materials Chemistry Engineering Monolayer Molecule General Materials Science Nanoscience & Nanotechnology chemistry.chemical_classification self-assembled monolayers Self-assembled monolayer Polymer Chemical Engineering chemistry Chemical engineering Microcontact printing Chemical Sciences infrared reflection absorption spectroscopy scanning electron microscopy Physical Chemistry (incl. Structural) |
| Zdroj: | ACS applied materials & interfaces, vol 5, iss 20 Schwartz, JJ; Hohman, JN; Morin, EI; & Weiss, PS. (2013). Molecular flux dependence of chemical patterning by microcontact printing. ACS Applied Materials and Interfaces, 5(20), 10310-10316. doi: 10.1021/am403259q. UCLA: Retrieved from: http://www.escholarship.org/uc/item/97w4p64x |
| Popis: | We address the importance of the dynamic molecular ink concentration at a polymer stamp/substrate interface during microcontact displacement or insertion printing. We demonstrate that by controlling molecular flux, we can influence both the molecular-scale order and the rate of molecular exchange of self-assembled monolayers (SAMs) on gold surfaces. Surface depletion of molecular ink at a polymer stamp/substrate interface is driven predominantly by diffusion into the stamp interior; depletion occurs briefly at the substrate by SAM formation, but diffusion of molecules into the bulk of the stamp dominates over practical experimental time scales. As contact time is increased, the interface concentration varies significantly due to diffusion, affecting the quality and coverage of printed films. Controlling interfacial concentration improves printed film reproducibility and the fractional coverage of multicomponent films can be controlled to within a few percent. We first briefly review the important aspects of molecular ink diffusion at a stamp interface and how it relates to experimental duration. We then describe two examples that illustrate control over ink transfer during experiments: the role of contact time on monolayer reproducibility and molecular order, and the fine control of fractional monolayer coverage for the displacement printing of 1-adamantanethiolate SAMs by 1-dodecanethiol. © 2013 American Chemical Society. |
| Databáze: | OpenAIRE |
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