Aluminum film over nanosphere surface for Deep Ultraviolet plasmonic nanosensors

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

Research output: Contribution to journalArticle

Abstract

Deep ultraviolet (DUV) plasmonic nanosensors are emerging as potential candidates to detect biomolecules with enhanced sensitivity, as these molecules strongly absorb light in the DUV region. In the present work, we fabricated aluminium film over nanospheres surface (AlFON) and successfully demonstrated, for the first time, an AlFON based DUV plasmonic nanosensor for detecting volatile organic compounds (VOCs) such as ethanol, isopropyl alcohol (IPA) and toluene, and bovine serum albumin (BSA) protein. The AlFON was fabricated by thermally evaporating aluminium thin film onto a two-dimensional photonic crystal (2DPC). The 2DPC was prepared by drop casting colloidal polystyrene spheres (PSS) on quartz substrates that self-assembled to form a monolayer of hexagonally close packed PSS with periodic interstices. The optical reflection spectrum of 70 nm AlFON exhibited a sharp minimum at 289 nm in the DUV wavelength range which corresponds to strong absorption in V-shaped nanocavities due to excitation of localized cavity plasmons. The reflection minimum - or LSPR wavelength - is sensitive to the changes in the refractive index of the surrounding medium. The LSPR mode of the V-shaped nanocavities in 70 nm AlFON was exploited to sense VOCs and BSA. The 70 nm AlFON exhibited 244 nm/RIU sensitivity in detecting VOCs and was capable of sensing 1 mM concentration of BSA in water. The AlFON is physically stable and has a self-limiting Al2O3 oxide layer of less than 5 nm thickness as elucidated from x-ray photoelectron spectroscopy measurements. The effect of higher aluminum film thickness, i.e. 100 nm and 120 nm on the sensitivity of AlFON also was studied. The performance of AlFON based DUV plasmonic nanosensors is better than the previously reported Al nanostructure based nanosensors and can still be enhanced by optimizing the structure of 2DPC and AlFON.

Original languageEnglish
Article number235103
JournalJournal of Physics D: Applied Physics
Volume52
Issue number23
DOIs
Publication statusPublished - 02-04-2019
Externally publishedYes

Fingerprint

Nanosensors
Nanospheres
Aluminum
aluminum
Volatile Organic Compounds
volatile organic compounds
Bovine Serum Albumin
Volatile organic compounds
albumins
serums
Polystyrenes
sensitivity
polystyrene
optical reflection
isopropyl alcohol
interstices
Wavelength
Quartz
Plasmons
2-Propanol

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Venkatesh, A. ; Piragash Kumar, R. M. ; Moorthy, V. H.S. / Aluminum film over nanosphere surface for Deep Ultraviolet plasmonic nanosensors. In: Journal of Physics D: Applied Physics. 2019 ; Vol. 52, No. 23.
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abstract = "Deep ultraviolet (DUV) plasmonic nanosensors are emerging as potential candidates to detect biomolecules with enhanced sensitivity, as these molecules strongly absorb light in the DUV region. In the present work, we fabricated aluminium film over nanospheres surface (AlFON) and successfully demonstrated, for the first time, an AlFON based DUV plasmonic nanosensor for detecting volatile organic compounds (VOCs) such as ethanol, isopropyl alcohol (IPA) and toluene, and bovine serum albumin (BSA) protein. The AlFON was fabricated by thermally evaporating aluminium thin film onto a two-dimensional photonic crystal (2DPC). The 2DPC was prepared by drop casting colloidal polystyrene spheres (PSS) on quartz substrates that self-assembled to form a monolayer of hexagonally close packed PSS with periodic interstices. The optical reflection spectrum of 70 nm AlFON exhibited a sharp minimum at 289 nm in the DUV wavelength range which corresponds to strong absorption in V-shaped nanocavities due to excitation of localized cavity plasmons. The reflection minimum - or LSPR wavelength - is sensitive to the changes in the refractive index of the surrounding medium. The LSPR mode of the V-shaped nanocavities in 70 nm AlFON was exploited to sense VOCs and BSA. The 70 nm AlFON exhibited 244 nm/RIU sensitivity in detecting VOCs and was capable of sensing 1 mM concentration of BSA in water. The AlFON is physically stable and has a self-limiting Al2O3 oxide layer of less than 5 nm thickness as elucidated from x-ray photoelectron spectroscopy measurements. The effect of higher aluminum film thickness, i.e. 100 nm and 120 nm on the sensitivity of AlFON also was studied. The performance of AlFON based DUV plasmonic nanosensors is better than the previously reported Al nanostructure based nanosensors and can still be enhanced by optimizing the structure of 2DPC and AlFON.",
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Aluminum film over nanosphere surface for Deep Ultraviolet plasmonic nanosensors. / Venkatesh, A.; Piragash Kumar, R. M.; Moorthy, V. H.S.

In: Journal of Physics D: Applied Physics, Vol. 52, No. 23, 235103, 02.04.2019.

Research output: Contribution to journalArticle

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