Mariano Palomba - Academia.edu (original) (raw)
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Papers by Mariano Palomba
Plastics Engineering, 2015
Nanoscale Research Letters, 2015
Owing to the very brittle nature of tellurium powder, nanoscopic grains with an average size of 4... more Owing to the very brittle nature of tellurium powder, nanoscopic grains with an average size of 4.8 ± 0.8 nm were produced by dry vibration milling technique using a mixer/mill apparatus. A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer. The morphology, elemental composition, and structural and optical properties of Te/PMMA films were investigated. The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide. The electrical properties of the films were studied, for different electrode contact configurations, in dark condition and under white light illumination varying the optical power density from 2 to 170 mW/cm(2) and turning the light on and off cyclically. Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.
International Journal of Nanoscience, 2010
Journal of Nanotechnology, 2012
Science and Engineering of Composite Materials, 2012
Science and Engineering of Composite Materials, 2011
ABSTRACT Nanosized graphite has been oxidized by the Hummers method to give high quality graphite... more ABSTRACT Nanosized graphite has been oxidized by the Hummers method to give high quality graphite oxide. This reaction is characterized by a very fast kinetic behavior and a high yield. The produced graphite oxide has been conveniently used to pattern graphene by using a standard photolithographic method, and the resulting systems have been characterized by optical microscopy (OM), scanning electron microscopy (SEM) and by Fourier transform infrared spectroscopy (FT-IR) and Visible-Near Infrared spectroscopy (Vis-NIR).
Journal of Nanoparticle Research, 2009
Journal of Materials Science, 2011
In the last decades, polymer matrix nanocomposites (PMN) have been studied extensively to exploit... more In the last decades, polymer matrix nanocomposites (PMN) have been studied extensively to exploit the properties of nanofillers for transforming the nature of practical household materials, in particular for mechanical properties . Despite the early successes [2], the massive interest in nanocomposites started in 1990s, when Toyota proved that adding mica to nylon produced a fivefold increase in the yield and tensile strength of the matrix material . Subsequent developments further contributed to the surging interest in polymer-nanoparticle composites. In particular, the growing availability of nanoparticles of monodispersed size and shape, such as fullerenes, carbon nanotubes, inorganic nanoparticles, dendrimers, and bionanoparticles, and the refining of instrumentation to probe nano-objects, such as scanning force, laser scanning fluorescence, and electron microscopes, have spurred research aimed at probing the influence of particle size and shape on the properties of PMN also for functional applications: optics, photonics, catalysis, electronic devices, and Microsystems . A sub-class of PMN is represented by the metal-polymer nanocomposites (hereinafter MPN) which directly harness the fundamental properties of metal nanoparticles when embedded in a polymer matrix. There is a widespread interest in this material class especially for the optical and photonic fields uses including: eye and sensor protection [7], optical communications [8], optical information processing [9], Raman enhancement materials [10], optical switching [11, 12], plasmon waveguides [13, 14], light stable colour filters [15, 16], polarisers [17], and modified refractive index materials [18]. Particularly, for all the applications mentioned above, the spectroscopy properties of silver nanoparticles are extremely useful; therefore, Ag-nanoparticles have been extensively modelled [19] and characterized when suspended in liquid media . Depending on the particle diameters and the surrounding medium the Ag-based colloids exhibit narrow and intense surface plasmon resonance (SPR) displaying selective absorption of visible radiation which are found suitable to develop a novel class of optical limiters and filters. In fact, it is generally acknowledged that the optical excitation of plasmon resonances in nanosized Ag particles is the most efficient mechanism by which light interacts with matter-a single Ag nanoparticle interacts with light more efficiently than a particle of the same size of any known chromophore. Silver is also the only material whose plasmon resonance can be tailored to any wavelength in the visible spectrum [22]. For all these reasons, in this study, silver was chosen as a nanofiller to develop a novel class of SPR material to be employed in a number of automotive components such as optical filtering glasses and micro-optical-electro-mechanical systems (MOEMS).
Beilstein Journal of Nanotechnology, 2017
Plastics Engineering, 2015
Nanoscale Research Letters, 2015
Owing to the very brittle nature of tellurium powder, nanoscopic grains with an average size of 4... more Owing to the very brittle nature of tellurium powder, nanoscopic grains with an average size of 4.8 ± 0.8 nm were produced by dry vibration milling technique using a mixer/mill apparatus. A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer. The morphology, elemental composition, and structural and optical properties of Te/PMMA films were investigated. The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide. The electrical properties of the films were studied, for different electrode contact configurations, in dark condition and under white light illumination varying the optical power density from 2 to 170 mW/cm(2) and turning the light on and off cyclically. Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.
International Journal of Nanoscience, 2010
Journal of Nanotechnology, 2012
Science and Engineering of Composite Materials, 2012
Science and Engineering of Composite Materials, 2011
ABSTRACT Nanosized graphite has been oxidized by the Hummers method to give high quality graphite... more ABSTRACT Nanosized graphite has been oxidized by the Hummers method to give high quality graphite oxide. This reaction is characterized by a very fast kinetic behavior and a high yield. The produced graphite oxide has been conveniently used to pattern graphene by using a standard photolithographic method, and the resulting systems have been characterized by optical microscopy (OM), scanning electron microscopy (SEM) and by Fourier transform infrared spectroscopy (FT-IR) and Visible-Near Infrared spectroscopy (Vis-NIR).
Journal of Nanoparticle Research, 2009
Journal of Materials Science, 2011
In the last decades, polymer matrix nanocomposites (PMN) have been studied extensively to exploit... more In the last decades, polymer matrix nanocomposites (PMN) have been studied extensively to exploit the properties of nanofillers for transforming the nature of practical household materials, in particular for mechanical properties . Despite the early successes [2], the massive interest in nanocomposites started in 1990s, when Toyota proved that adding mica to nylon produced a fivefold increase in the yield and tensile strength of the matrix material . Subsequent developments further contributed to the surging interest in polymer-nanoparticle composites. In particular, the growing availability of nanoparticles of monodispersed size and shape, such as fullerenes, carbon nanotubes, inorganic nanoparticles, dendrimers, and bionanoparticles, and the refining of instrumentation to probe nano-objects, such as scanning force, laser scanning fluorescence, and electron microscopes, have spurred research aimed at probing the influence of particle size and shape on the properties of PMN also for functional applications: optics, photonics, catalysis, electronic devices, and Microsystems . A sub-class of PMN is represented by the metal-polymer nanocomposites (hereinafter MPN) which directly harness the fundamental properties of metal nanoparticles when embedded in a polymer matrix. There is a widespread interest in this material class especially for the optical and photonic fields uses including: eye and sensor protection [7], optical communications [8], optical information processing [9], Raman enhancement materials [10], optical switching [11, 12], plasmon waveguides [13, 14], light stable colour filters [15, 16], polarisers [17], and modified refractive index materials [18]. Particularly, for all the applications mentioned above, the spectroscopy properties of silver nanoparticles are extremely useful; therefore, Ag-nanoparticles have been extensively modelled [19] and characterized when suspended in liquid media . Depending on the particle diameters and the surrounding medium the Ag-based colloids exhibit narrow and intense surface plasmon resonance (SPR) displaying selective absorption of visible radiation which are found suitable to develop a novel class of optical limiters and filters. In fact, it is generally acknowledged that the optical excitation of plasmon resonances in nanosized Ag particles is the most efficient mechanism by which light interacts with matter-a single Ag nanoparticle interacts with light more efficiently than a particle of the same size of any known chromophore. Silver is also the only material whose plasmon resonance can be tailored to any wavelength in the visible spectrum [22]. For all these reasons, in this study, silver was chosen as a nanofiller to develop a novel class of SPR material to be employed in a number of automotive components such as optical filtering glasses and micro-optical-electro-mechanical systems (MOEMS).
Beilstein Journal of Nanotechnology, 2017