Constraints on Microcontact Printing Imposed by Stamp Deformation

Hui, Chung‐Yuen; Jagota, Anand; Lin, Yung-Hsiang; Krämer, Edward J.

doi:10.1021/la0113567

Cited by 427 publications

(477 citation statements)

References 21 publications

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“…PDMS stamp is produced with the required surface structures (1). It is then "inked" with the thiol (2) and placed in contact with the gold substrate (3). A small amount of pressure is applied manually (4) before the stamp is removed, leaving the patterned SAM on the substrate.…”

Section: Resultsmentioning

confidence: 99%

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Submerged Microcontact Printing (SμCP): An Unconventional Printing Technique of Thiols Using High Aspect Ratio, Elastomeric Stamps

Bessueille¹,

Pla-Roca²,

Mills³

et al. 2005

Langmuir

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A technique for microcontact printing of thiols in liquid media is presented. Elastomeric poly(dimethyl siloxane) stamps are used to pattern gold surfaces with thiol-based self-assembled monolayers. The liquid (water in this case) has been used as an incompressible support and, advantageously, also acts as a medium in which alkylthiol ink molecules are poorly miscible. Consequently, we have been able to produce patterned thiol monolayers using stamps with aspect ratios unsuitable for conventional microcontact printing (i.e., 15:1) and present evidence to suggest that it is possible to use stamps with aspect ratios of up to 100:1.

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Section: Resultsmentioning

confidence: 99%

“…1 Unfortunately, conventional CP suffers from problems that limit pattern resolution. 2 These include limits on the structural aspect ratio and the printing conditions dictated by the elastomeric stamp.…”

Section: Introductionmentioning

confidence: 99%

Submerged Microcontact Printing (SμCP): An Unconventional Printing Technique of Thiols Using High Aspect Ratio, Elastomeric Stamps

Bessueille¹,

Pla-Roca²,

Mills³

et al. 2005

Langmuir

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“…Finite deformation owing to surface tension effects has been observed in soft solids such as PDMS [16,17]. Given a sharp corner in the SU-8 master, a slight rounding of the fibril edge results in the PDMS replica owing to surface tension effects [16].…”

Section: Fabrication Of Micropillars Having Tips With Round Edges: Tymentioning

confidence: 99%

Preload-responsive adhesion: effects of aspect ratio, tip shape and alignment

Paretkar

Kamperman

Martina

et al. 2013

J. R. Soc. Interface.

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We tested the adhesive response of polymer surfaces structured with arrays of cylindrical fibrils having diameters of 10 -20 mm and aspect ratios 1-2.4. Fibrils had two different tip shapes of end-flaps and round edges. A preloadinduced mechanical buckling instability of the fibrils was used to switch between the states of adhesion and non-adhesion. Non-adhesion in fibrils with round edges was reached at preloads that caused fibril buckling, whereas fibrils with end-flaps showed adhesion loss only at very high preloads. The round edge acted as a circumferential flaw prohibiting smooth tip contact recovery leading to an adhesion loss. In situ observations showed that, after reversal of buckling, the end-flaps unfold and re-form contact under prevailing compressive stress, retaining adhesion in spite of buckling. At very high preloads, however, end-flaps are unable to re-form contact resulting in adhesion loss. Additionally, the end-flaps showed varying contact adaptability as a function of the fibril -probe alignment, which further affects the preload for adhesion loss. The combined influence of preload, tip shape and alignment on adhesion can be used to switch adhesion in bioinspired fibrillar arrays.

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“…Conventional semiconductor techniques such as photolithography have been applied to fabricate 3D structures [5]; however, these techniques are limited in terms of material selection and process scale [6]. Moreover, they typically involve multistep processes, toxic chemicals and are expensive [7].…”

Section: List Of Tablesmentioning

confidence: 99%

Hybrid 3D printing by bridging micro/nano processes

Yoon

Jang

Kim

et al. 2017

J. Micromech. Microeng.

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The aim of this work was to develop a novel hybrid manufacturing method for nanoscale three-dimensional (3D) printing with multi-material capabilities. 3D structuring methods at the micro/nanoscale are major goals of various engineering fields, and much work has been carried out to improve the minimum feature size, geometrical complexity, and material selection. With the aim of nanoscale multimaterial printing, a hybrid process was reported with an integrated nanoparticle deposition system (NPDS) and focused ion beam (FIB) system; however this process has limitations in terms of surface roughness and control over the layer thickness, as well as with the process scale, and furthermore, lack of sacrificial layers.In this dissertation, a novel hybrid process is described, which combines aerodynamically focused nanoparticle (AFN) printing, micro-machining and focused ion beam (FIB) milling. AFN printing is based on NPDS, and micromachining was used for local planarization. In addition to these processes, spincoating was used to fabricate sacrificial layers. By bridging these different II micro/nanoscale processes, the resulting hybrid process can address the limitations of the individual processes.To create the hybrid process, each process was investigated to enable compatibility. With the AFN printing system, the surface morphology of a detached substrate was observed, and the bonding mechanism between the substrate and nanoparticles was investigated. A novel printing strategy was identified to reduce the scale of the process. With the micro-machining system, different tool geometries were investigated. Complex geometries inspired by conventional-scale tools were implemented on the micro-scale, and their effects were investigated. With the FIB system, material re-deposition phenomena were investigated to reduce defects that occur during ion sputtering. A novel path-generation strategy was identified and investigated for different scanning paths.Process capability is discussed using fabrication examples and functional applications. The novel hybrid process represents a significant advance in the state of the art, and enables far improved process scales or dimensional degree of freedom, without losing the advantages of broad choice of materials.3D-pinted micro bi-material cantilevers were fabricated as a thermal actuator.The mechanical and thermal properties of the structure were investigated using an in-situ measurement system, and irregular thermal phenomena were analyzed. It is expected that these in-situ measurements of the 3D printed microstructure will contribute to materials research.Various 3D structures can be fabricated using the process described here from a range of metal/ceramic inorganic materials, including polymers. In particular, it is expected that the process will contribute to the area of customized nanoscale structuring, with potential applications in medical treatments. It is also expected that this work will contribute to further improvements in manufacturing technology by combining different m...

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Constraints on Microcontact Printing Imposed by Stamp Deformation

Cited by 427 publications

References 21 publications

Submerged Microcontact Printing (SμCP): An Unconventional Printing Technique of Thiols Using High Aspect Ratio, Elastomeric Stamps

Submerged Microcontact Printing (SμCP): An Unconventional Printing Technique of Thiols Using High Aspect Ratio, Elastomeric Stamps

Preload-responsive adhesion: effects of aspect ratio, tip shape and alignment

Hybrid 3D printing by bridging micro/nano processes

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