Non-covalent functionalization using lithographically patterned polyelectrolyte multilayers for high-density microarrays

Prashanth, Gurusiddappa R.; Goudar, Venkanagouda S.; Suran, Swathi; Raichur, Ashok M.; Varma, Manoj M.

doi:10.1016/j.snb.2012.04.006

Cited by 16 publications

(19 citation statements)

References 32 publications

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“…After that a layer of PAH (a positive polyelectrolyte) was injected inside the flow cell. The PAH layer will bind BSA based on electrostatic interaction [10]. BSA of concentration 10 ng/ml was injected inside the flow cell after which the intensity value started increasing due to binding of BSA and reached saturation after some time.…”

Section: Resultsmentioning

confidence: 99%

“…The polyelectrolytes were deposited in a layer-by-layer (LbL) fashion by alternately dipping the substrate in aqueous solutions of these polymers in concentration of 1 mg/ml. The LbL deposition is possible on any substrate such as metals, glass, plastic and even transparency sheets [10,11]. Thickness of one bilayer is approximately 3-4 nm [10,11].…”

Section: Polyelectrolytesmentioning

confidence: 99%

“…The LbL deposition is possible on any substrate such as metals, glass, plastic and even transparency sheets [10,11]. Thickness of one bilayer is approximately 3-4 nm [10,11]. On the DVD grating substrates 2, 4, 6, 8, 10, 12, 14 and 16 bilayers (one cationic and one anionic polyelectrolyte together form one bilayer) were deposited.…”

Section: Polyelectrolytesmentioning

confidence: 99%

“…Here we demonstrate an alternate method to enhance the Q factor of SPR from DVD substrates by depositing alternatively charged polymers in a layer-by-layer (LbL) manner on the grating surface prior to metallization. The LbL assembly is based on self-limiting electrostatic interactions of polyelectrolyte materials [10,11]. As the thickness of each layer is typically around 3 nm, the profile of the grating and consequently the plasmonic response can be precisely tuned.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhancing the quality factor of grating coupled plasmon resonance in optical recording media

Chakraborty

Kumawat

Sultana

et al. 2016

Sensors and Actuators A: Physical

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Section: Resultsmentioning

confidence: 99%

Section: Polyelectrolytesmentioning

confidence: 99%

Section: Polyelectrolytesmentioning

confidence: 99%

Section: Introductionmentioning

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Enhancing the quality factor of grating coupled plasmon resonance in optical recording media

Chakraborty

Kumawat

Sultana

et al. 2016

Sensors and Actuators A: Physical

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“…In the second part, the patterned substrate was alternatively dipped in cationic and anionic polyelectrolytes, PAH and PAA, respectively, to create the PEM-MA using a technique described in detail previously. 17 The dip cycles were of 1 min duration with a DI water rinse step of 1 min duration after each dip. The dip cycles were repeated to obtain the required number of bilayers.…”

mentioning

confidence: 99%

Exploiting transient phenomena for imaging with breath figures

Sasikumar

Varma

2017

Applied Physics Letters

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Breath figures refer to the patterns formed when vapor condenses into the liquid phase on a surface, revealing heterogeneities in topography or chemical composition. These figures are composed of micro-droplets, which scatter light and produce optical contrast. Differences in hydrophobicity imposed by surface features or contaminants result in a difference in micro-droplet densities, which has been used in applications such as substrate independent optical visualization of single layer graphene flakes. Here, we show that transient phenomena, such as the pinning transition of micro-droplets condensed over a polymer surface, can be used to enhance the optical contrast even when the time averaged difference in micro-droplet densities is not substantial. Thus, this work opens a new way of visualizing surface heterogeneities using transient phenomena occurring during condensation or evaporation of micro-droplets as opposed to only using time averaged differences in wettability due to the surface features.

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Fast‐Dip Layer‐by‐Layer Self‐Assembly of Polyelectrolytes as a Low‐Cost Biosensing Platform

Boranna

Vishwaraj

Pahal

et al. 2022

Macro Chemistry & Physics

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Polyelectrolyte multilayer (PEM) films fabricated using Layer-by-Layer (LbL) self-assembly are most versatile for numerous surface tailoring applications. Physicochemical customization of PEM at a nanometer scale is possible by choice of incorporated materials, assembly parameters, and assembly techniques. Conventional dip (CDip) (10-15 min dip time) coating dominates the PEM fabrication due to its simple, geometry-independent, and economical coating capabilities. Deposition of the PEM in CDip-LbL happens in two phases, that is, the initial adsorption phase followed by rearrangement of the complementary polyelectrolyte chains. By shortening the prolonged rearrangement phase, thicker stratified PEM films can form with a reduced dipping time (1 min), called Fast Dip (FDip). This reduction in the dipping time is studied in situ using Etched Fiber Bragg Grating-based sensors. To define the practical utility of the FDip deposited PEM, bio-molecular loading studies are performed using biotin and Bovine Serum Albumin (BSA). FDip-LbL is as effective as CDip-LbL self-assembly and also better than spin-LbL. Thus, the FDip deposition prompts a scalable LbL self-assembly process for quick fabrication of the biosensing platforms.

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Non-covalent functionalization using lithographically patterned polyelectrolyte multilayers for high-density microarrays

Cited by 16 publications

References 32 publications

Enhancing the quality factor of grating coupled plasmon resonance in optical recording media

Enhancing the quality factor of grating coupled plasmon resonance in optical recording media

Exploiting transient phenomena for imaging with breath figures

Fast‐Dip Layer‐by‐Layer Self‐Assembly of Polyelectrolytes as a Low‐Cost Biosensing Platform

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