Entity

Time filter

Source Type


Persano L.,CNR Institute of Neuroscience | Persano L.,Soft Materials and Technologies SRL | Camposeo A.,CNR Institute of Neuroscience | Camposeo A.,Soft Materials and Technologies SRL | And 2 more authors.
Journal of Materials Chemistry C | Year: 2013

Organic multifunctional materials are becoming increasingly relevant to many fields of technology. Bottom-up assembly processes to give well-defined supramolecular architectures are a powerful tool to control the size and organization of molecular and polymeric nano- and microstructures. The full exploitation of these molecular systems in devices, however, often requires a superior technological control which should span very different length scales, enabling nanoscale control as well as large-area patterning and interfacing of active molecules with electrodes, external optical excitation or collection, biotechnological and lab-on-chip platforms of practical use, and so on. This critically depends on the development of specific lithographic approaches which are inherently hybrid in their character, since they combine bottom-up and top-down nanofabrication strategies in a smart way. Here we review and discuss some of these relevant hybrid methods, with a focus on their ultimate applicability to device platforms. The invention of a successfully integrated bottom-up/top-down strategy for microfabrication of functional macromolecules relies on exploiting their peculiar physico-chemical properties, and on building genuinely cross-disciplinary know-how and technologies. © 2013 The Royal Society of Chemistry. Source


Camposeo A.,CNR Institute of Neuroscience | Camposeo A.,Soft Materials and Technologies SRL | Spadaro D.,CNR Institute for Chemical and Physical Processes | Magri D.,Soft Materials and Technologies SRL | And 7 more authors.
Analytical and Bioanalytical Chemistry | Year: 2016

Nanofibers functionalized by metal nanostructures and particles are exploited as effective flexible substrates for surface-enhanced Raman scattering (SERS) analysis. Their complex three-dimensional structure may provide Raman signals enhanced by orders of magnitude compared to untextured surfaces. Understanding the origin of such improved performances is therefore very important for pushing nanofiber-based analytical technologies to their upper limit. Here, we report on polymer nanofiber mats which can be exploited as substrates for enhancing the Raman spectra of adsorbed probe molecules. The increased surface area and the scattering of light in the nanofibrous system are individually analyzed as mechanisms to enhance Raman scattering. The deposition of gold nanorods on the fibers further amplifies Raman signals due to SERS. This study suggests that Raman signals can be finely tuned in intensity and effectively enhanced in nanofiber mats and arrays by properly tailoring the architecture, composition, and light-scattering properties of the complex networks of filaments. © 2015 Springer-Verlag Berlin Heidelberg. Source


Persano L.,CNR Institute of Neuroscience | Moffa M.,CNR Institute of Neuroscience | Fasano V.,University of Salento | Montinaro M.,University of Salento | And 10 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

Electrospinning technologies for the realization of active polymeric nanomaterials can be easily up-scaled, opening perspectives to industrial exploitation, and due to their versatility they can be employed to finely tailor the size, morphology and macroscopic assembly of fibers as well as their functional properties. Light-emitting or other active polymer nanofibers, made of conjugated polymers or of blends embedding chromophores or other functional dopants, are suitable for various applications in advanced photonics and sensing technologies. In particular, their almost onedimensional geometry and finely tunable composition make them interesting materials for developing novel lasing devices. However, electrospinning techniques rely on a large variety of parameters and possible experimental geometries, and they need to be carefully optimized in order to obtain suitable topographical and photonic properties in the resulting nanostructures. Targeted features include smooth and uniform fiber surface, dimensional control, as well as filament alignment, enhanced light emission, and stimulated emission. We here present various optimization strategies for electrospinning methods which have been implemented and developed by us for the realization of lasing architectures based on polymer nanofibers. The geometry of the resulting nanowires leads to peculiar light-scattering from spun filaments, and to controllable lasing characteristics. © 2016 SPIE. Source


Persano L.,University of Salento | Persano L.,Soft Materials and Technologies SRL | Camposeo A.,University of Salento | Camposeo A.,Soft Materials and Technologies SRL | Pisignano D.,University of Salento
Progress in Polymer Science | Year: 2015

Abstract Active polymer nanofibers for opto- and nano-electronics benefit from low cost and versatile fabrication processes and exhibit an unequaled flexibility in terms of chemical composition, physical properties and achievable functionality. For these reasons, they have rapidly emerged as powerful tool for nanotechnologies and as building blocks of a wide range of devices. Both bottom up and top down nanofabrication concepts were developed to produce nanofibers made of conjugated or other functional polymers and blends. This article summarizes and reviews the chemico-physical and functional requirements for polymer nanofibers to be used in opto- and nanoelectronics, as well as recent advances in various promising device architectures, such as light emitting and photovoltaic devices, photodetectors, field-effect transistors, piezo- and thermoelectric generators, and actuators. The outlook of functional polymer nanofibers and of devices based on them is also outlined and discussed. © 2014 Elsevier Ltd. All rights reserved. Source


Camposeo A.,University of Salento | Camposeo A.,Italian Institute of Technology | Camposeo A.,Soft Materials and Technologies SRL | Persano L.,University of Salento | And 4 more authors.
Macromolecular Materials and Engineering | Year: 2013

The processing, properties, and applications of electrospun light-emitting nanofibers are reviewed. The different experimental approaches for electrospinning conjugated polymers and light-emitting compounds are presented. The characterization of the optoelectronic properties of electrospun conjugated polymer nanofibers evidences intriguing features, such as polarized emission, self-waveguiding, enhanced energy transfer, and charge transport. The applications of such nanostructured materials include polarized light sources for lab-on-chip devices, nanoscale organic light-emitting diodes and optically pumped lasers, field-effect transistors, and high-performance optical sensors. Future challenges and perspectives of electrospun light-emitting nanofibers are also discussed. Light-emitting nanofibers are novel materials able to generate, guide, and detect light, with sub-micrometer spatial resolution. The electrospinning method is used strategically in this respect, allowing fine control of the nanostructure shape and size and high throughput. This paper provides an overview of the properties of electrospun light-emitting nanofibers and of their potential applications. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Discover hidden collaborations