Nanopits based novel hybrid plasmonic nanosensor fabricated by a facile nanofabrication technique for biosensing

R. M. Piragash Kumar, A. Venkatesh, V. H.S. Moorthy

Research output: Contribution to journalArticle

Abstract

Hybrid plasmonic nanosensors that harness the benefits of both localized and propagating surface plasmons are progressing toward practical real-life applications in point-of-care diagnosis. Here, we demonstrate a novel hybrid plasmonic nanosensor composed of random nanopits in Ag thin film prepared using a simple, single-step, and cost-effective nanofabrication technique. The nanopits are asymmetric in shape with trench-shaped sharp bottom and possess high aspect ratios. Morphology of the nanopits is significantly distinct from other look-alike nanostructures such as nanowells, nanoslits and nanotrenches. The high bulk sensitivity (1292 nm/RIU) of the nanosensor and lowest detectable surface concentration of BSA molecules (0.59-1.1 ng mm-2) are better than many of the contemporary nanosensors that include nanowells and nanovoids. We postulate the better sensing performance to result from the Fano-type resonances and unique morphology of hotspots in nanopits.

Original languageEnglish
Article number1150B6
JournalMaterials Research Express
Volume6
Issue number11
DOIs
Publication statusPublished - 23-10-2019
Externally publishedYes

Fingerprint

Nanosensors
Nanotechnology
Plasmons
Aspect ratio
Nanostructures
Thin films
Molecules
Costs

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

Cite this

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abstract = "Hybrid plasmonic nanosensors that harness the benefits of both localized and propagating surface plasmons are progressing toward practical real-life applications in point-of-care diagnosis. Here, we demonstrate a novel hybrid plasmonic nanosensor composed of random nanopits in Ag thin film prepared using a simple, single-step, and cost-effective nanofabrication technique. The nanopits are asymmetric in shape with trench-shaped sharp bottom and possess high aspect ratios. Morphology of the nanopits is significantly distinct from other look-alike nanostructures such as nanowells, nanoslits and nanotrenches. The high bulk sensitivity (1292 nm/RIU) of the nanosensor and lowest detectable surface concentration of BSA molecules (0.59-1.1 ng mm-2) are better than many of the contemporary nanosensors that include nanowells and nanovoids. We postulate the better sensing performance to result from the Fano-type resonances and unique morphology of hotspots in nanopits.",
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Nanopits based novel hybrid plasmonic nanosensor fabricated by a facile nanofabrication technique for biosensing. / Piragash Kumar, R. M.; Venkatesh, A.; Moorthy, V. H.S.

In: Materials Research Express, Vol. 6, No. 11, 1150B6, 23.10.2019.

Research output: Contribution to journalArticle

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