Aluminum film over nanosphere surface for Deep Ultraviolet plasmonic nanosensors

Venkatesh, Anusha and Kumar, Piragash R M and Moorthy, V H S (2019) Aluminum film over nanosphere surface for Deep Ultraviolet plasmonic nanosensors. Journal of Physics D - Applied Physics, 52 (23). pp. 235103-235110. ISSN 0022-3727

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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 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 on quartz substrates that self assembled to form a monolayer of hexagonally close packed polystyrene spheres 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 XPS

Item Type: Article
Uncontrolled Keywords: UV plasmonics, Aluminium film over nanospheres surface (AlFON), DUV nanosensors, plasmonic nanosensors, protein sensing, V- shaped nanocavities
Subjects: Engineering > MIT Manipal > Electronics and Communication
Depositing User: MIT Library
Date Deposited: 15 Jan 2020 04:35
Last Modified: 15 Jan 2020 04:35

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