Biomimetic soft lithography on curved nanostructured surfaces

Auzelyté, Vaida; Flauraud, Valentin; Cadarso, Víctor J.; Kiefer, Thomas; Brugger, Juergen

doi:10.1016/j.mee.2012.03.013

Cited by 13 publications

(8 citation statements)

References 19 publications

(17 reference statements)

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“…The mogul pattern fabricated on the glass was sequentially replicated to PDMS and to UV‐curable polyurethane acrylate (PUA) by using soft lithography, as shown in Figure d. The mogul‐patterned PDMS can be used as a substrate for device fabrication or mold for the generation of a mogul pattern on PUA, which can be used as a master mold for further replication of a mogul‐patterned PDMS substrate . More details of the fabrication are presented in the Experimental Section, and Section 2 and 3 and Figure S1 of the Supporting Information.…”

Section: Geometric Engineering Of Flexible Materials For Stretchabilitymentioning

confidence: 99%

Mogul‐Patterned Elastomeric Substrate for Stretchable Electronics

et al. 2016

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A mogul-patterned stretchable substrate with multidirectional stretchability and minimal fracture of layers under high stretching is fabricated by double photolithography and soft lithography. Au layers and a reduced graphene oxide chemiresistor on a mogul-patterned poly(dimethylsiloxane) substrate are stable and durable under various stretching conditions. The newly designed mogul-patterned stretchable substrate shows great promise for stretchable electronics.

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Section: Geometric Engineering Of Flexible Materials For Stretchabilitymentioning

confidence: 99%

Mogul‐Patterned Elastomeric Substrate for Stretchable Electronics

et al. 2016

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“…Aluminium foil was wrapped on a grounded copper collector for collecting the fibers. The details on electrospinning set up can be found elsewhere [13]. Electrospinning was done for 30 minutes on aluminium foil used as a substrate with following set of parameters-applied voltage: 10kV, distance between syringe needle and collector: 10cm., syringe needle: 24 gauge (ID 0.31mm), feed rate: 1µl/m.…”

Section: Methods 1(electrospinning)mentioning

confidence: 99%

“…By varying the fiber morphology from long continuous fibers to only beads, we have fabricated negative PDMS replicas with surface roughness varying over an order of magnitude in length scale. In second approach, biomimicking has been demonstrated as another way to fabricate rough polymer surfaces over a large area [13][14]. Here we have chosen flower petals of a plant, Euphorbia milii, as a master template.…”

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confidence: 99%

Fabrication of Rough Polymer Surfaces Exhibiting Anti-reflective Properties

Mattaparthi

Sharma

2015

MRS Proc.

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We have demonstrated some facile ways to fabricate the large area polymer surfaces with varying roughness followed by studying their anti-reflective properties. One of the approaches is based on electrospun nanofibers deposited on a substrate in an uneven non-woven matrix. This electrospun fabric was used as a master template to fabricate the negative replica of the fibers by soft lithography generating the roughness in polydimethylsiloxane (PDMS) surfaces. The second approach is based on biomimicking of flower petals. Petals are used as a master template to transfer surface features with hierarchical roughness over PDMS surface using replica moulding. As fabricated polymer surfaces with varied roughness have then tested for their anti-reflective properties using UV-VIS spectroscopy over a wide range of wavelengths and angles of incidence of light. These measurements show near zero reflection of patterned PDMS surfaces as compared to planar PDMS. This omnidirectional broadband anti-reflection behaviour of polymer surfaces can be used in wide variety of engineering applications including in solar cells. INTRODUCTIONSurfaces which suppress reflection are known as anti-reflective and are widely used in lot of engineering applications such as optical devices, light emitting diode and solar cells [1-3]. Antireflection can be achieved using thin film coatings however with some limitations like radiation damage due to thermal gradient between different layers, adhesion problems within multiple thin film layers and therefore, cannot be used for a broad range of incident light. Taking inspiration from nature, several studies have been carried out on certain species of moths, as their corneal surface has regular hexagonal arrays of sub-micron structures [4][5]. Further certain species of butterflies have multiscale structures on their wings which exhibits antireflective properties [6][7]. However fabrication of those multiscale structures is either limited by small area constraint or cost associated with use of highly sophisticated micro-and nano-fabrication tools [8][9][10]. In the present work, we have demonstrated a simple approach to fabricate large area anti-reflective polymer surfaces by inducing roughness at different length scale. First approach is based on exploiting the roughness of nanofibers deposited in a non-woven matrix by electrospinning [11][12]. Electrospun nanofiber mat has been used as a master template to fabricate the negative replica of the fibers in polydimethylsiloxane (PDMS) using soft lithography. By varying the fiber morphology from long continuous fibers to only beads, we have fabricated negative PDMS replicas with surface roughness varying over an order of magnitude in length scale. In second approach, biomimicking has been demonstrated as another way to fabricate rough polymer surfaces over a large area [13][14]. Here we have chosen flower petals of a plant, Euphorbia milii, as a master template. Euphorbia milii petal is ultrahydrophobic due to the presence of multiscale surface features lead...

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“…The most interesting materials are hard and optically transparent as well, so that they are applicable for both, UV and thermal nanoimprint processes [4]. Ormostamp TM (Microresist technology GmbH) [5][6][7][8] is a UV curable Silica based organic hybrid material and can be for hard substrates like e.g. quartz plates.…”

Section: Introductionmentioning

confidence: 99%