Scanning Electron Microscopy of Nanoscale Chemical Patterns

Srinivasan, Charan; Mullen, Tracy; Hohman, J. Nathan; Anderson, Mary Elizabeth; Dameron, Arrelaine A.; Andrews, Anne M.; Dickey, Elizabeth C.; Horn, Mark W.; Weiss, Paul S.

doi:10.1021/nn7000799

Cited by 74 publications

(123 citation statements)

References 51 publications

Supporting

Mentioning

120

Contrasting

Order By: Relevance

“…We have previously shown that the SEM is sensitive to exposed chemical functionality and chemical patterns. 47 ■ RESULTS AND DISCUSSION Infrared Spectroscopy of Printed Films. Infrared reflectance adsorption spectroscopy (IRRAS) is an ensemble technique used to determine SAM structural and compositional details.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Molecular Flux Dependence of Chemical Patterning by Microcontact Printing

Schwartz

Hohman

Morin

et al. 2013

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: ■ Experimental Sectionmentioning

confidence: 99%

Molecular Flux Dependence of Chemical Patterning by Microcontact Printing

Schwartz

Hohman

Morin

et al. 2013

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…Functionalization of chemically patterned surfaces adds new degrees of utility by enabling surface reactivity to be patterned at the nanometer scale. This has led to nanoscale films being used as biocompatible/bioactive scaffolds, molecular-sized electronic components, selective molecular resists, and other types of surfaces where both patterned structure and molecular interactions are necessary (Chen et al 1997;Xia and Whitesides 1998a;Smith et al 2004;Srinivasan et al 2007). As processes are developed for creating such chemical patterns, metrology tools and methods must be developed in lockstep in order to follow the patterning steps and to optimize the quality of the surfaces obtained.…”

Section: Chemically Patterned Surfacesmentioning

confidence: 99%

“…As processes are developed for creating such chemical patterns, metrology tools and methods must be developed in lockstep in order to follow the patterning steps and to optimize the quality of the surfaces obtained. These metrology methods remain in their infancy (Allara and Nuzzo 1985;Porter et al 1987;Nuzzo et al 1990;Lopez et al 1993;Pertsin and Grunze 1994;Lahiri et al 1999a;Srinivasan et al 2007;Mrksich 2008).…”

Section: Chemically Patterned Surfacesmentioning

confidence: 99%

“…One technique to fabricate chemically patterned surfaces is lithography-assisted chemical patterning (LACP), where conventional lithography is employed in conjunction with SAMs to create chemical patterns with high fidelity (Anderson et al 2006;Srinivasan et al 2007). This is accomplished by exploiting a commercially available lift-off resist that can withstand the selfassembly process without disrupting the underlying SAM.…”

Section: Chemically Patterned Surfacesmentioning

confidence: 99%

“…One approach has been the development of hybrid patterning strategies for a wide range of applications. These utilize self-and directed assembly in conjunction with existing nanofabrication infrastructure (Xia et al 1999;Lewis et al 2001a;Smith et al 2004;Srinivasan et al 2007). …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hybrid approaches to nanometer-scale patterning: Exploiting tailored intermolecular interactions

et al. 2008

Self Cite

View full text Add to dashboard Cite

In this perspective, we explore hybrid approaches to nanometer-scale patterning, where the precision of molecular self-assembly is combined with the sophistication and fidelity of lithography. Two areas--improving existing lithographic techniques through self-assembly and fabricating chemically patterned surfaces--will be discussed in terms of their advantages, limitations, applications, and future outlook. The creation of such chemical patterns enables new capabilities, including the assembly of biospecific surfaces to be recognized by, and to capture analytes from, complex mixtures. Finally, we speculate on the potential impact and upcoming challenges of these hybrid strategies.

show abstract

Direct Writing Micropatterns with a Resolution up to 1 µm

Zhang

et al. 2019

Adv Funct Materials

View full text Add to dashboard Cite

Solution processes have been widely used to fabricate micropatterned surfaces for its mild operation conditions. However, current approaches suffer from limitations of either low resolution or high cost. Here, a facile approach is proposed for direct writing micropatterns with a resolution up to ≈1 µm using a unit of triple conical fibers with the side-by-side parallel arrangement. With this unit, the resolution of the micropatterns can be mainly controlled by the single central conical fiber, with one side of the fiber facilitating continuous and steady liquid transfer onto the substrate and the other side mechanically supporting the whole unit. Particularly, the unit enables tunable dimension of the micropatterns within a rather large scale from ≈1 µm to ≈1.3 mm by varying the writing parameters (speed, height, and angle). Moreover, the unit is applicable for direct patterning various liquids, even into microline arrays, with a high resolution. It enables direct writing conductive microline with a width of ≈1 µm in a centimeter length scale, which can be used for constructing microcircuits. It is envisioned that the result offers a new perspective for preparing high-resolution micropatterns using solution processes.

show abstract

Scanning Electron Microscopy of Nanoscale Chemical Patterns

Cited by 74 publications

References 51 publications

Molecular Flux Dependence of Chemical Patterning by Microcontact Printing

Molecular Flux Dependence of Chemical Patterning by Microcontact Printing

Hybrid approaches to nanometer-scale patterning: Exploiting tailored intermolecular interactions

Direct Writing Micropatterns with a Resolution up to 1 µm

Contact Info

Product

Resources

About