A5075332453- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Gold and Silver Nanoparticles Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Terahertz technology and applications
- Copper-based nanomaterials and applications
- Nanoplatforms for cancer theranostics
- Strong Light-Matter Interactions
- Nanocluster Synthesis and Applications
- Photonic Crystals and Applications
- ZnO doping and properties
- Nonlinear Optical Materials Studies
- Neuroscience and Neural Engineering
- Transition Metal Oxide Nanomaterials
- Atmospheric and Environmental Gas Dynamics
- Perovskite Materials and Applications
- Atmospheric Ozone and Climate
- Advanced Sensor and Energy Harvesting Materials
- Nanoparticles: synthesis and applications
- Spectroscopy and Laser Applications
- Marine Biology and Environmental Chemistry
- Advanced Thermoelectric Materials and Devices
- Mechanical and Optical Resonators
- Gas Sensing Nanomaterials and Sensors
- Superconducting and THz Device Technology
Italian Institute of Technology
2013-2023
Center for Biomolecular Nanotechnologies
2019
Istituto Nazionale per la Fisica della Materia
1999
Recently, plasmonic copper sulfide (Cu2-xS) nanocrystals (NCs) have attracted much attention as materials for photothermal therapy (PTT). Previous reports correlated photoinduced cell death to the heat mechanism of these NCs, and no evidence their photodynamic properties has been reported yet. Herein we prepared physiologically stable near-infrared (NIR) NCs analyzed properties, including therapeutic potential in cultured melanoma cells a murine model. Interestingly, observe that, besides...
Nanoparticles (NPs) are increasingly used in biomedical applications, but the factors that influence their interactions with living cells need to be elucidated. Here, we reveal role of NP surface charge determining neuronal and electrical responses. We discovered negatively charged NPs administered at low concentration (10 nM) interact membrane synaptic cleft, whereas positively neutrally never localize on neurons. This effect is shape material independent. The presence cell membranes...
Terahertz spectroscopy has vast potentialities in sensing a broad range of elementary excitations (e.g., collective vibrations molecules, phonons, excitons, etc.). However, the large wavelength associated with terahertz radiation (about 300 μm at 1 THz) severely hinders its interaction nano-objects, such as nanoparticles, nanorods, nanotubes, and molecules biological relevance, practically limiting studies to macroscopic ensembles these compounds, form thick pellets crystallized or highly...
We synthesized CdSe/CdS giant-shell nanocrystals, with a CdSe core diameter between 2.8 nm and 5.5 nm, CdS shell thickness of up to 7–8 (equivalent about 20 monolayers CdS). Both the have wurtzite crystal structure, yielding epitaxial growth nearly defect-free crystals. As result, photoluminescence (PL) quantum efficiency (QE) is as high 90%. Quantitative PL measurements at various excitation wavelengths allow us separate nonradiative decay into contributions from interface surface trapping,...
We studied cation exchange (CE) in core/shell Cu2–xSe/Cu2–xS nanorods with two cations, Ag+ and Hg2+, which are known to induce rapid within metal chalcogenide nanocrystals (NCs) at room temperature. At the initial stage of reaction, guest ions diffused through Cu2–xS shell reached Cu2–xSe core, replacing first Cu+ latter region. These experiments prove that CE copper NCs is facilitated by high diffusivity cations lattice, such they can probe whole host structure identify preferred regions...
Two-color emitting colloidal semiconductor nanocrystals (NCs) are of interest for applications in multimodal imaging, sensing, lighting, and integrated photonics. Dual color emission from core- shell-related optical transitions has been recently obtained using so-called dot-in-bulk (DiB) CdSe/CdS NCs comprising a quantum-confined CdSe core embedded into an ultrathick (∼7-9 nm) CdS shell. The physical mechanism underlying this behavior is still under debate. While large shell volume appears...
Nanocrystals (NCs) of transparent conducting oxides with a localized surface plasmon resonance (LSPR) in the near-infrared (NIR) spectral region show promising electrochromic properties for development new generation dynamic "smart windows". In this regard, we exploit thin films F, In-codoped CdO (FICO) NCs as active coatings devices. The control over dopants concentration FICO results fine tuning their LSPR across NIR electromagnetic spectrum. Highly mesoporous electrodes were prepared from...
CuFeS2 chalcopyrite nanoparticles (NPs) can generate heat under exposure to near-infrared laser irradiation. Here, we develop a protocol decorate the surface of NPs (13 nm) with thermoresponsive (TR) polymer based on poly(ethylene glycol methacrylate) combine heat-mediated drug delivery and photothermal damage. The resulting TR-CuFeS2 feature small hydrodynamic size (∼75 nm), along high colloidal stability TR transition temperature 41 °C in physiological conditions. Remarkably, NPs, when...
We report the synthesis of colloidal CdSe/Cu(3)P/CdSe nanocrystal heterostructures grown from hexagonal Cu(3)P platelets as templates. One type heterostructure was a sort "coral", formed by vertical pillars CdSe preferentially on both basal facets platelet and at its edges. Another had "sandwich" architecture, two thick, epitaxial layers encasing original platelet. When sandwiches were annealed under vacuum up to 450 °C, sublimation P Cd species with concomitant interdiffusion Cu Se observed...
We calculated the absorption coefficient of colloidal wurtzite CdSe/CdS nanocrystals (NCs), ranging from spherical to strongly elongated shapes (aspect ratio up 21) by correlating NC absorbance spectrum elemental composition and overall dimensions. compared experimental data with numerical finite-element calculations coefficient, which can account for nonspheroidal shape influence organic ligand shell. The results unveiled that quantum confinement effects properties, even at relatively high...
Abstract Phonons (quanta of collective vibrations) are a major source energy dissipation and drive some the most relevant properties materials. In nanotechnology, phonons severely affect light emission charge transport nanodevices. While phonon response is conventionally considered an inherent property nanomaterial, here we show that dipole-active resonance semiconducting (CdS) nanocrystals can be drastically reshaped inside terahertz plasmonic nanocavity, via strong coupling with cavity...
Among the different synthesis approaches to colloidal nanocrystals, a recently developed toolkit is represented by cation exchange reactions, where use of template nanocrystals gives access materials that would be hardly attainable via direct synthesis. Besides, postsynthetic treatments, such as thermally activated solid-state represent further flourishing route promote finely controlled exchange. Here, we report that, upon in situ heating transmission electron microscope, Cu2Se or Cu...
In this article, we report the measurement of underwater aerophobicity, through captive-bubble method, for different polymeric coatings employed to protect microscale and nanoscale flexible electronic devices seawater applications. Controlling morphology wettability coating, in particular with incorporation nanoparticles fluorinated polymers, allows adjust hydrophilic/hydrophobic (aerophobic/aerophilic) character surface order achieve a more insulating antibiofouling behavior. Morphological...
Copper binary compounds are often intrinsic p-type semiconductors due to the presence of Cu(I) vacancies, with corresponding hole carriers in valence band. If free carrier concentration is high enough, localized plasmon resonances can be sustained nanocrystals, frequencies infra-red (<1 eV), respect typical seen visible range case metals (Ag, Au, ...). The localization demonstrated scanning transmission electron energy loss spectroscopy (STEM-EELS) by combining spatial and resolutions. Here...
Abstract Here, cation exchange (CE) reactions are exploited to radiolabel ZnSe, ZnS, and CuFeS 2 metal chalcogenide nanocrystals (NCs) with 64 Cu. The CE protocol requires one simple step, mix the water‐soluble NCs a Cu solution, in presence of vitamin C used reduce Cu(II) Cu(I). Given quantitative replacement on NCs, high radiochemical yield, up 99%, is reached. Also, provided that there no free Cu, purification step needed, making easily translatable clinic. A unique aspect approach...
CdSe@CdS dot@rods with diameter around 6 nm and length of either 20, 27, or 30 dot@octapods pod diameters ∼15 lengths ∼50 were investigated by X-ray absorption spectroscopy. These heterostructures are prepared seed-mediated routes, where the structure, composition, morphology CdSe nanocrystals used as a seed play key roles in directing growth second semiconducting domain. The local structural environment all elements was at Cd, S, Se K-edges taking advantage selectivity spectroscopy,...
We studied the oscillator strength fgap of band gap transition in heteronanocrystals (hNCs) with a spherical CdSe core embedded an elongated CdS shell. A comparison core-only NCs confirmed reduction electron–hole overlap hNCs larger than 2.05 eV or smaller 1.98 eV. However, decrease is limited to about 50% when compared NCs, suggesting that residual confinement still localizes electron near core. correlated radiative lifetime obtained from multiexponential photoluminescence (PL) decay...
When the integrated differential absorption lidar (DIAL) technique is used to perform concentration measurements over long distances, alignment between on and off laser beams becomes important. Here, through analysis of error corresponding geometric form factor, effect misalignment lines performance by a coaxial DIAL system considered.
Phonons are quantized lattice vibrations that represent a major energy dissipation channel in solid-state systems [1], both at the macro- and nano-scale. Although phonon response of specific nanomaterial is usually considered as its intrinsic fingerprint, here we show how it can be altered by exploiting unique properties terahertz (THz) plasmonic nanocavities [2]. Specifically, obtained such from end-to-end coupling (30-nm gap size) few-μm-long gold nanoantennas. We fabricated series arrays...
Exploiting the localization and enhancement capabilities of terahertz resonant dipole nanoantennas coupled through nanogaps, we present an effective method to perform spectroscopy on extremely small number nano-objects.
We present our recent studies on terahertz resonant dipole nanoantennas. Exploiting the localization and enhancement capabilities of these devices, we introduce an effective method to perform spectroscopy extremely small number nano-objects.