Prof. Nunzio Motta Profile

Prof. Nunzio Motta

at Queensland Univ of Technology

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Publications (6)

Proceedings Article | 30 December 2019 Paper

Hybrid plasmonic-semiconducting fractal metamaterials for superior sensing of volatile compounds

Z. Fusco, M. Rahmani, N. Motta, M. Käll, D. Neshev, A. Tricoli

Proceedings Volume 11202, 112020A (2019) https://doi.org/10.1117/12.2539740

KEYWORDS: Fractal analysis, Plasmonics, Gold, Refractive index, Nanoparticles, Aerosols, Metamaterials, Dielectrics, Physics, Environmental sensing

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Localized surface plasmon resonance (LSPR) is a subwavelength optical phenomenon that has found widespread use in bio- and chemical- sensing applications thanks to the possibility to efficiently transduce refractive index changes into wavelength shifts. However, is it very hard to transpose the successes demonstrated in liquid and physiological environment toward the detection of gasous molecules. In fact, the latter typically adsorb in an unspecific manner and induce very minute refractive index changes tipicaly below the sensor sensitivity.

Here, we show first insights on the aerosol large-scale self-assembly of metasurfaces made of monocrystalline Au nanoislands with uniform disorder over large scale. Notably, these architectures show tuneable disorder levels and demonstrate high-quality LSPR, enabling the fabrication of highly performing optical gas sensors detecting down to 10−5 variations in refractive index.

Next, we use our aerosol synthesis method to integrate tailored fractals of dielectric TiO2 nanoparticles onto resonant plasmonic metasurfaces. We show how this integration strongly enhances the interaction between the plasmonic field and volatile organic molecules and provides a means for their selective detection. Interesting, the improved performance is the result of a synergetic behavior between the dielectric fractals and the plasmonic metasurface: in fact, upon this integration, the enhancement of plasmonic field is drastically extended, all the way up to a maximum thickness of 1.8 μm.

Optimal dielectric-plasmonic structures allow measurements of changes in the refractive index of the gas mixture down to <8x10^-6at room temperature and selective identification of three exemplary volatile organic compounds (VOCs). These findings provide a basis for the development of a novel family of hybrid dielectric-plasmonic materials with application extending from light harvesting and photo-catalysts to contactless sensors for non-invasive medical diagnostics.

Proceedings Article | 9 August 2013 Paper

Fabrication and characterisation of graphene oxide-epoxy nanocomposite

Dilini Galpaya, Mingchao Wang, Cheng Yan, Meinan Liu, Nunzio Motta, Eric Waclawik

Proceedings Volume 8793, 87930U (2013) https://doi.org/10.1117/12.2026759

KEYWORDS: Oxides, Graphene, Epoxies, Nanocomposites, Polymers, Transmission electron microscopy, Scanning electron microscopy, Carbon, Raman spectroscopy, Composites

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Proceedings Article | 30 August 2006 Paper

Molecular-resolved imaging of conductive polymer self-organization at single-walled carbon nanotube interfaces

John Bell, Roland G. Goh, Nunzio Motta, Anthony Musumeci, Eric Waclawik

Proceedings Volume 6325, 632503 (2006) https://doi.org/10.1117/12.680116

KEYWORDS: Single walled carbon nanotubes, Polymers, Scanning tunneling microscopy, Carbon nanotubes, Transmission electron microscopy, Crystals, Multilayers, Molecular self-assembly, Polymer thin films, Composites

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Proceedings Article | 19 January 2006 Paper

Self-organization in composites of poly(3-hexylthiophene) and single-walled carbon nanotubes designed for use in photovoltaic applications

Eric Waclawik, John Bell, Roland Goh, Anthony Musumeci, Nunzio Motta

Proceedings Volume 6036, 603607 (2006) https://doi.org/10.1117/12.638665

KEYWORDS: Polymers, Single walled carbon nanotubes, Composites, Scanning tunneling microscopy, Carbon nanotubes, Crystals, Polymer thin films, Transmission electron microscopy, Heterojunctions, Excitons

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Proceedings Article | 13 January 2006 Paper

Ge/Si island nucleation and ordering on naturally and artificially patterned substrates

Nunzio Motta, A. Sgarlata, A. Balzarotti, P. Szkutnik

Proceedings Volume 6036, 603601 (2006) https://doi.org/10.1117/12.638951

KEYWORDS: Germanium, Scanning tunneling microscopy, Nanostructures, Silicon, Optical lithography, Lithography, Nanotechnology, Ions, Ion beams, Nanolithography

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Showing 5 of 6 publications

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