Research activity: Novel magnetic systems for sensors, actuators and medicine.
People involved: Giovanni Ausanio, Vincenzo Iannotti, Luciano Lanotte;
Topics: Elasto- and nano-structured magnetic materials for sensing and actuating systems
Description: Production and characterization of innovative elasto-magnetic composites with high piezo-resistive and magneto-mechanical sensitivity. They consist of ferromagnetic and conductive micro- or nano-particles homogeneously dispersed in an elastic matrix. The studies are aimed to understand the main physical mechanisms that are the basis of the coupling of these properties in the same material, to optimize the piezo-resistive and elasto-magnetic coupling. The final goal is to produce innovative elasto-magnetic composites, conceived in such a way us to have a deformation following an applied magnetic field and consequently a giant resistivity change, for applications as core materials in sensors of deformation, displacement and local magnetic field.
G. Ausanio, V. Iannotti, V. Guarino, L. Ambrosio, L. Lanotte, “Magneto-piezoresistive elastomers optimization and sensitivity in prospect of MEMS using magnetization direction reading”, Sensors and Actuators, A: Physical 265, pp. 253-260, (2017);
V. Iannotti, G. Ausanio, L. Lanotte, “Magneto-piezoresistivity in iron particle-filled silicone: An alternative outlook for reading magnetic field intensity and direction”, eXPRESS Polymer Letters 10, pp. 65-71, (2016).
Prototype of a position (or low displacement) sensor
Prototype of a position (or low displacement) sensor: Calibration curve of a magneto-piezoresistive position sensor.
(M) Cylindrical Magnet; (S) magneto-piezoresitive sample; From Sensors and Actuators A: Physical, 205, 235-239 (2014).
(C) Contact Cu Capillary Wires; (E) Clamped Extremity.
Topics: New magnetic nano-structures and composites for medical therapies
Description: Characterization and study of magnetic nanoparticles, core/shell heterostructures and nanostructured composite materials with specific magnetic properties, drastically altered with respect to their bulk counterparts, for their fundamental-scientific and technological-commercial interest. The studies, carried out by using vibrating sample magnetometry, atomic and magnetic force microscopy, high resolution transmission electron microscopy and the synchrotron radiation facilities, are aimed to link structural-morphological features to physical response and to conceive materials with new peculiar and tunable properties for biomedical applications.
V. Iannotti, A. Adamiano, G. Ausanio, L. Lanotte, G. Acquilanti, J.M.D. Coey, M. Lantieri, G. Spina, M. Fittipaldi, G. Margaris, K. Trohidou, S. Sprio, M. Montesi, S. Panseri, M. Sandri, M. Iafisco, A. Tampieri, “Fe-Doping-Induced Magnetism in Nano-Hydroxyapatites”, Inorg. Chem. 56, pp. 4446-4458, (2017).
The oxidation induced by the synthesis process is fundamental for the arising of FeHA magnetic properties, determining the arrangement of Fe2+/3+ ions that can adopt(i) the hydroxyapatite lattice as isolated ions, (ii) the nonapatitic domain as interacting paramagnetic ions, or (iii) segregation into external interacting superparamagnetic maghemite nanoparticles. From Inorg. Chem. 56, pp. 4446-4458, (2017).
Research activity: ORGANIC ELECTRONICS
People involved: Mario Barra, Antonio Cassinese, Federico Chianese, Fabio Chiarella, Ciro Nappi, Loredana Parlato, Ettore Sarnelli.
Description: This research activity deals with the study of the charge transport phenomena in conjugated organic materials and related systems for the development of innovative electronics and sensors. The compounds of interest are deposited mainly in form of thin films using physical vapor deposition techniques (i.e. joule evaporation by Knudsen cells, supersonic molecular beam evaporation) while their structural and morphological properties are carefully analyzed by AFM microscopy and X-ray diffractometry. The electrical features of the deposited layers are characterized at both micro and nanoscale using DC and AC techniques. Particular attention is also given to the analysis of the electronic properties of organic-inorganic or organic-organic interfaces through advanced experimental approaches such as Kelvin Probe microscopy or Synchrotron-light-based techniques.
At the present, main research topics are:
Vapour-based deposition of new organic semiconductors and fabrication of highly performing organic field-effect transistors and related circuits;
Characterization and modeling of the charge transport in organic nano-devices and nano-structures;
New functional electronic systems combining 2D (i.e. Graphene, MoS2) materials and organic molecules;
Deposition and characterization of organic-inorganic hybrid perovskite films;
Ionic/electronic transduction effects in organic field-effect and electrochemical transistors.
M. Barra, F.V. Di Girolamo, F.Chiarella, M.Salluzzo, Z.Chen, A. Facchetti, L. Anderson, and A. Cassinese, Transport Property and Charge Trap Comparison for N-Channel Perylene Diimide Transistors with Different Air-Stability, Journal of physical chemistry C 114, (2010) 20387-20393;
M. Barra, F. V. Di Girolamo, N. A. Minder, I. Gutierrez Lezama, Z. Chen, A. Facchetti, A. F. Morpurgo, A. Cassinese, Very low bias stress in n-type organic single-crystal transistors, Appl. Phys. Lett. 100, (2012) 133301;
F. V. Di Girolamo, M. Barra, F. Chiarella, S. Lettieri, M. Salluzzo, A. Cassinese, Ambipolar transport and charge transfer at the interface between sexithiophene and N,N-bis(n-octyl)-dicyanoperylenediimide films, Phys. Rev. B .85, (2012) 125310;
M. Barra, D. Viggiano, P. Ambrosino, F. Bloisi, F.V. D Girolamo, M. V. Soldovieri, M. Taglialatela, A. Cassinese, Addressing the use of PDIF-CN2 molecules in the development of n-type organic field-effect transistors for biosensing applications, Biophisica et Biochima Acta – General Subjects 1830, (2013) 4365-4373;
F. Chiarella, T. Toccoli, M. Barra, L. Aversa, F. Ciccullo, R. Tatti, R. Verucchi, S. Iannotta, A. Cassinese, High mobility n-type organic thin-film transistors deposited at room temperature by supersonic molecular beam deposition, Applied. Physics. Letters 104, (2014) 143302;
F. Chiarella, M. Barra, A. Carella, L. Parlato, E. Sarnelli, A. Cassinese, Contact-resistance effects in PDI8-CN2 n-type thin-film transistors investigated by Kelvin-probe potentiometry Organic Electronics 28, (2016) 299-305, DOI: 10.1016/j.orgel.2015.11.009;
F.Chiarella, F. Chianese, M. Barra, L. Parlato, T. Toccoli, A. Cassinese, Spontaneous Wetting Dynamics in Perylene Diimide n-Type Thin Films Deposited at Room Temperature by Supersonic Molecular Beam, Journal of physical chemistry C 120, (2016) 26076-26082, DOI: 10.1021/acs.jpcc.6b07310;
F. Chianese, F. Chiarella, M. Barra, A. Carella, A. Cassinese Scanning Kelvin Probe Microscopy investigation of the contact resistances and charge mobility in n-type PDIF-CN2 thin-film transistors vol. 52, (2018), 206-212. DOI: 10.1016/j.orgel.2017.10.021