Hybrid Nanoimprint−Soft Lithography with Sub-15 nm Resolution

Li, Zhiwei; Gu, Yuan Dong; Wang, Lei; Ge, Haixiong; Wu, Wei; Xia, Qiangfei; Yuan, Changsheng; Chen, Yanfeng; Cui, Bo; Williams, R. Stanley

doi:10.1021/nl9004892

Cited by 150 publications

(108 citation statements)

References 20 publications

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“…Traditional techniques for patterning surfaces with spatial wettability contrast include vapor deposition (8), photolithography (3), and soft lithography (54,55). Although photolithography can only be used to pattern flat substrates, soft lithography using flexible molds or masks fabricated via photolithography can work on cylindrical or conical surfaces, i.e., curved surfaces with zero Gaussian curvature (54,55).…”

Section: Resultsmentioning

confidence: 99%

Spontaneous wettability patterning via creasing instability

Chen

McKinley

Cohen

2016

Proc. Natl. Acad. Sci. U.S.A.

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Surfaces with patterned wettability contrast are important in industrial applications such as heat transfer, water collection, and particle separation. Traditional methods of fabricating such surfaces rely on microfabrication technologies, which are only applicable to certain substrates and are difficult to scale up and implement on curved surfaces. By taking advantage of a mechanical instability on a polyurethane elastomer film, we show that wettability patterns on both flat and curved surfaces can be generated spontaneously via a simple dip coating process. Variations in dipping time, sample prestress, and chemical treatment enable independent control of domain size (from about 100 to 500 μm), morphology, and wettability contrast, respectively. We characterize the wettability contrast using local surface energy measurements via the sessile droplet technique and tensiometry.wettability contrast | creasing instability | domain size | morphology | curved surfaces S urfaces that juxtapose local hydrophilic areas with hydrophobic areas show superior performance compared with surfaces with homogeneous wettability in many industrial applications including heat transfer (1), water collecting (2-6), particle separation (7), and microfluidics (8). For instance, developing enhanced water-collecting efficiency has been inspired by the Namib desert beetle, which was reported (2) to have hydrophilic bumps on an overall wax-covered hydrophobic surface. Although the hydrophilic bumps reduce the nucleation/coalescence energy of microdroplets, the overall hydrophobic character of the surface facilitates the spontaneous shedding of water droplets when they grow beyond a certain size.To achieve surfaces with wettability patterning, traditional fabrication methods such as photolithography and soft lithography have been used. However, these methods are generally not cost-effective, not readily scaled up, require multiple process steps, and are difficult to implement on curved surfaces (3, 9). Recently, mechanical instabilities have been explored as a facile self-assembly approach to endow surfaces with superhydrophobicity (10-12), superhydrophilicity (13), or anisotropic wettability (14). Although mechanical self-assembly provides a low cost route for spontaneous generation of surface patterns, explorations to date have been focused on introducing surface roughness via wrinkling and crumpling instabilities. Here we show that surfaces can be spontaneously patterned with chemical patches with small changes in surface roughness by harnessing a reversible creasing instability (15-17).A creasing instability develops when a soft polymer network is placed under mechanical compression beyond a certain critical strain, at which point sharp folds spontaneously develop and grow on the deformable free surfaces (18). This process has been linked to the morphology development of the brain (19,20), electric breakdown of dielectric elastomers (21), and has also been harnessed to prepare switchable surfaces actuated by temperature (22) or electric ...

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Section: Resultsmentioning

confidence: 99%

Spontaneous wettability patterning via creasing instability

Chen

McKinley

Cohen

2016

Proc. Natl. Acad. Sci. U.S.A.

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“…Soft Nanoimprint Lithography is an inexpensive technique to fabricate high resolution nanopatterns on large areas with good reproducibility [6,9]. A flexible hybrid-PDMS working stamp comprising a 1 × 1 cm 2 array of 200 × 400 nm rectangular shaped pillars of 250 nm height is imprinted in a bilayer resist system consisting of a lift-off and nanoimprint layer.…”

Section: Nanoparticle Fabrication and Rotational Dynamics Measurementsmentioning

confidence: 99%

Biomolecular Detection Based on the Rotational Dynamics of Magneto-Plasmonic Nanoparticles

Shoshi

Schneeweiss

Haslinger

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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Abstract:We report on a nanoparticle-based biosensor that represents a label-free homogeneous bioassay suitable for in-vitro biomolecular diagnostics. The underlying detection principle is based on the optical observation of the rotational dynamics of multicomponent nanoparticles utilizing magnetic and plasmonic properties. The plasmon-optical properties of the anisotropic nanoparticles depending on their material composition and geometrical design were investigated by numerical simulations. Based on such an analysis, monodisperse magneto-plasmonic nanoparticles were fabricated using physical fabrication methods. Rotational dynamics measurements revealed the lowest detectable particle concentration in the picomolar (ng/mL) regime, which is very promising in reaching the biomolecular limit of detection which is relevant for routine clinical diagnostics.

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“…Thus far, there have been many methods developed to fabricate these arrays, including aluminum oxide (AAO) template technique [10,11], nano-imprint lithography [12], electron beam ligthography [13] and colloidal lithography [14][15][16], etc. Among these, colloidal lithography is an inexpensive, flexible, and efficient method for fabrication of periodically arranged nanostructured arrays on a large scale by using the mono-, or bi-layer organic colloidal crystals as templates, due to their interstitial geometry.…”

Section: Introductionmentioning

confidence: 99%

Morphological and Structural Control of Organic Monolayer Colloidal Crystal Based on Plasma Etching and Its Application in Fabrication of Ordered Gold Nanostructured Arrays

Liu

Cai

2016

Crystals

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Abstract:The organic monolayer colloidal crystals, which are usually prepared by self-assembling, could be used as templates, due to their interstitial geometry, for the periodically arranged nanostructured arrays, which have important applications in many fields, such as photonic crystals, information storage, super-hydrophobicity, biological and chemical sensing. Obviously, the structures of the obtained arrays mainly depend on those of the templates. However, the self-assembled monolayer colloidal crystal is exclusive in structure and for its hexagonal close-packed colloidal arrangement, leading to the limitation of the monolayer colloidal crystal as the template for the nanostructured arrays. Therefore, structural diversity is important in order for colloidal crystals to be used as the templates for various nanostructured arrays. Recently, there have been some reports on the morphological and structural manipulation of the organic monolayer colloidal crystals. In this review article, we focus on the recent progress in morphological and structural manipulation of polystyrene monolayer colloidal crystals based on plasma etching, and its application in the fabrication of the ordered gold nanostructured arrays with different structures, mainly including close-packed monolayer colloidal crystal and its transferrable property; structural manipulation based on plasma etching; and fabrication of gold nanostructured arrays based on varied monolayer colloidal crystals as template.

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Hybrid Nanoimprint−Soft Lithography with Sub-15 nm Resolution

Cited by 150 publications

References 20 publications

Spontaneous wettability patterning via creasing instability

Spontaneous wettability patterning via creasing instability

Biomolecular Detection Based on the Rotational Dynamics of Magneto-Plasmonic Nanoparticles

Morphological and Structural Control of Organic Monolayer Colloidal Crystal Based on Plasma Etching and Its Application in Fabrication of Ordered Gold Nanostructured Arrays

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