A5025384988- Force Microscopy Techniques and Applications
- Organic Electronics and Photovoltaics
- Mechanical and Optical Resonators
- Adhesion, Friction, and Surface Interactions
- Thin-Film Transistor Technologies
- Advanced Sensor and Energy Harvesting Materials
- Semiconductor materials and devices
- Conducting polymers and applications
- Analytical Chemistry and Sensors
- Organic Light-Emitting Diodes Research
- Molecular Junctions and Nanostructures
- Advanced MEMS and NEMS Technologies
- Surface and Thin Film Phenomena
- Electrochemical Analysis and Applications
- Electronic and Structural Properties of Oxides
- Near-Field Optical Microscopy
- Nanofabrication and Lithography Techniques
- 2D Materials and Applications
- Advanced Memory and Neural Computing
- Graphene research and applications
- Integrated Circuits and Semiconductor Failure Analysis
- Ferroelectric and Piezoelectric Materials
- MXene and MAX Phase Materials
- Geophysics and Sensor Technology
- Advanced Materials and Mechanics
National Research Council
2008-2025
Istituto di Scienza e Tecnologie dell'Informazione "Alessandro Faedo"
2011-2024
University of Salerno
2023-2024
National Institute of Optics
2013-2023
Lancaster University
2012
Institute for Chemical and Physical Processes
2007-2010
Institute of Nanostructured Materials
2004-2010
University of Manchester
2002-2005
University of Washington
2000-2001
University of Michigan
2001
Hole mobility in organic ultrathin film field-effect transistors is studied as a function of the coverage. For layered sexithienyl films, charge carrier rapidly increases with increasing coverage and saturates at about two monolayers. This shows that first molecular layers next to dielectric interface dominate transport. A quantitative analysis spatial correlations second layer crucial, it provides efficient percolation pathways for carriers generated both layers. The upper do not actively...
Organic light-emitting transistors based on bilayered structures (see figure) exhibit balanced ambipolar transport and mobility values as large 3 × 10–2 cm2 V–1 s–1. The best performances are realized by sequentially depositing α,ω-dihexyl-quaterthiophene (DH4T) p-type N,N′-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (P13) n-type materials. Laser-scanning confocal microscopy allows selective imaging of the layers.
An investigation into the stability of metal-insulator-semiconductor (MIS) transistors based on α-sexithiophene is reported. In particular, kinetics threshold voltage shift upon application a gate bias has been determined. The follow stretched-hyperbola-type behavior, in agreement with formalism developed to explain metastability amorphous-silicon thin-film transistors. Using this model, quantification device possible. Temperature-dependent measurements show that there are two processes...
Abstract Poly(N-isopropylacrylamide) (PNIPAm) is widely used to fabricate cell sheet surfaces for culturing, however copolymer and interpenetrated polymer networks based on PNIPAm have been rarely explored in the context of tissue engineering. Many complex expensive techniques employed produce PNIPAm-based films culturing. Among them, spin coating has demonstrated be a rapid fabrication process thin layers with high reproducibility uniformity. In this study, we introduce an innovative...
The growth of vacuum-sublimed tetracene thin films on silicon dioxide has been investigated from the early stages process. effects deposition flux and substrate silanization film morphology electrical properties have explored. Tetracene shows an island growth, resulting in with a granular structure. Both increase determine decrease grain size improvement connectivity direct contact substrate. hole mobility field-effect transistors based films, which also generate electroluminescence,...
A physical effect of ultrasound induced lubricity is reported. We studied the dynamic friction dependence on out-of-plane ultrasonic vibration a sample using force microscopy and scanning probe technique, microscope, which can dynamics tip–sample elastic contact at submicrosecond scale. The results show that vanishes when tip–surface breaks for part cycle. Moreover, reduces well before such break, this reduction does not depend normal load. This suggests presence surface layer with...
Among all transition metal oxides, titanium dioxide (TiO
Ultrasonic force microscopy (UFM) was introduced to probe nanoscale mechanical properties of stiff materials. This achieved by vibrating the sample far above first resonance probing atomic microscope cantilever where becomes dynamically rigid. By operating UFM at different set values, it is possible directly measure absolute values tip-surface contact stiffness. From this an evaluation surface elastic can be carried out assuming a suitable solid-solid model. In paper we present curves...
Silk fibroin (SF), a protein core fibre from the silkworm Bombyx mori, has huge potential to become sustainable, biocompatible, and biodegradable material platform that can pave way towards replacement of plastic in fabrication bio-derived materials for variety technological biomedical applications. SF remarkable mechanical flexibility, controllable biodegradability, biocompatibility is capable drug/doping inclusion, stabilization release. However, dielectric properties limit its as direct...
Abstract Bulk heterojunction (BHJ) organic solar cells can offer a range of specific advantages, making them suitable for potential integration into wide variety applications. This circumstance is driving an ever increasing attention to the environmental profile this technology throughout its entire life cycle. Consequently, alternative materials and processes with reduced impact attract interest from researchers focused on developing new generation eco‐designed devices. In context,...
Abstract The increasing production of nano-devices and nano-composite materials has prompted the development new instruments to probe smaller volumes. Regarding mechanical properties in particular, modified atomic force microscopes using modulation at frequencies below cantilever resonance have been successfully employed investigate relatively compliant such as bio-materials polymers but shown limitations highly stiff materials. alternative approach ultrasonic microscopy (UFM) uses sample...
We report on the influence of dielectric/organic interface properties electrical characteristics field-effect transistors based polyphenylenevinylene derivatives. Through a systematic investigation most common dielectric surface treatments, direct correlation their effect parameters, such as charge carrier mobility, On/Off current ratio, threshold voltage, and hysteresis, has been established. It is found that presence OH groups at surface, already known to act traps for electrons, decreases...
Understanding the elastic response on nanoscale phase boundaries of multiferroics is an essential issue in order to explain their exotic behaviour. Mixed-phase BiFeO3 films, epitaxially grown LaAlO3 (001) substrates, have been investigated by means scanning probe microscopy characterize and piezoelectric responses mixed-phase region rhombohedral-like monoclinic (MI) tilted tetragonal-like (MII,tilt) phases. Ultrasonic force reveal that regions with low/high stiffness values topologically...
Stimuli-responsive microgels have attracted great interest in recent years as building blocks for fabricating smart surfaces with many technological applications. In particular, PNIPAM are promising candidates creating thermo-responsive scaffolds to control cell growth and detachment via temperature stimuli. this framework, understanding the influence of solid substrate is critical tailoring microgel coatings specific The surface modification a winning strategy used manage microgel–substrate...
The realization of organic light-emitting transistors (OLETs) based on α,ω-dihexylcarbonylquaterthiophene (DHCO4T), an intrinsically ambipolar and luminescent semiconductor, is reported. In this device structure, optimization the hole/electron density ratio in channel region has been identified as major issue to optimize light emission.. Therefore, focus study understand how DHCO4T optoelectronic response vary with semiconductor film growth conditions well selection gate dielectric metal...
Two-dimensional semiconductors are gaining increasing interest for their potential application in several fields. In particular, when combined with graphene into vertical van der Waals heterostructures, they have demonstrated unique properties, such as large spin–orbit coupling at the valence band maximum and ultrafast charge transfer. An understanding of WS2 stability on epitaxial ambient conditions is crucial development applications. this work, we study environmental aging related...
The glass transition of thin polymeric films can be profitably studied using lateral force microscopy (LFM) if the system is calibrated regarding operational parameters, in particular applied load and scanning velocity. We have established that these two parameters significantly influence occurrence an apparent transition. In particular, we found local pressure, by LFM tip, insufficient to generate a hydrostatic pressure effect causing increase temperature. fact, at constant scan velocity...
Abstract An investigation into the stability of metal insulator semiconductor (MIS) transistors based on α ‐sexithiophene is reported. In particular kinetics threshold voltage shift upon application a gate bias has been determined. The follow stretched‐hyperbola type behavior, in agreement with formalism developed to explain metastability amorphous–silicon thin film transistors. Using this model, quantification device possible. Temperature‐dependent measurements show that there are two...
Scanning probe microscopy (SPM) represents a powerful tool that, in the past 30 years, has allowed for investigation of material surfaces unprecedented ways at nanoscale level. However, SPM shown very little capability depth penetration, which several nanotechnology applications require. Subsurface imaging been achieved only few cases, when subsurface features influence physical properties surface, such as electronic states or heat transfer. Ultrasonic force (UFM), an adaption contact mode...