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Article ; Online: Superradiant Thomson scattering from graphite in the extreme ultraviolet.

Fasolato, Claudia / Stellino, Elena / Principi, Emiliano / Mincigrucci, Riccardo / Pelli-Cresi, Jacopo Stefano / Foglia, Laura / Postorino, Paolo / Sacchetti, Francesco / Petrillo, Caterina

Proceedings of the National Academy of Sciences of the United States of America

2024 Volume 121, Issue 4, Page(s) e2221293121

Abstract: We study the Thomson scattering from highly oriented pyrolitic graphite excited by the extreme ultraviolet, coherent pulses of FERMI free electron laser (FEL). An apparent nonlinear behavior is observed and fully described in terms of the coherent nature ...

Abstract	We study the Thomson scattering from highly oriented pyrolitic graphite excited by the extreme ultraviolet, coherent pulses of FERMI free electron laser (FEL). An apparent nonlinear behavior is observed and fully described in terms of the coherent nature of both exciting FEL beam and scattered radiation, producing an intensity-dependent enhancement of the Thomson scattering cross-section. The process resembles Dicke's superradiant phenomenon and is thus interpreted as the observation of superradiant Thomson scattering. The process also triggers the creation of coherent, low-
Language	English
Publishing date	2024-01-19
Publishing country	United States
Document type	Journal Article
ZDB-ID	209104-5
ISSN	1091-6490 ; 0027-8424
ISSN (online)	1091-6490
ISSN	0027-8424
DOI	10.1073/pnas.2221293121
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Article: Nanoscale Surface-Enhanced Raman Spectroscopy Investigation of a Polyphenol-Based Plasmonic Nanovector.

Nisini, Giacomo / Scroccarello, Annalisa / Ripanti, Francesca / Fasolato, Claudia / Cappelluti, Francesco / Capocefalo, Angela / Della Pelle, Flavio / Compagnone, Dario / Postorino, Paolo

Nanomaterials (Basel, Switzerland)

2023 Volume 13, Issue 3

Abstract: The demand for next-generation multifunctional nanovectors, combining therapeutic effects with specific cellular targeting, has significantly grown during the last few years, pursuing less invasive therapy strategies. Polyphenol-conjugated silver ... ...

Abstract	The demand for next-generation multifunctional nanovectors, combining therapeutic effects with specific cellular targeting, has significantly grown during the last few years, pursuing less invasive therapy strategies. Polyphenol-conjugated silver nanoparticles (AgNPs) appear as potential multifunctional nanovectors, integrating the biorecognition capability and the antioxidant power of polyphenols, the antimicrobial activity of silver, and the drug delivery capability of NPs. We present a spectroscopic and microscopic investigation on polyphenol-synthesized AgNPs, selecting caffeic acid (CA) and catechol (CT) as model polyphenols and using them as reducing agents for the AgNP green synthesis, both in the presence and in the absence of a capping agent. We exploit the plasmonic properties of AgNPs to collect Surface-Enhanced Raman Scattering (SERS) spectra from the nanosized region next to the Ag surface and to characterize the molecular environment in the proximity of the NP, assessing the orientation and tunable deprotonation level of CA, depending on the synthesis conditions. Our results suggest that the SERS investigation of such nanovectors can provide crucial information for their perspective biomedical application.
Language	English
Publishing date	2023-01-17
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano13030377
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Article: Signatures of Polaron Dynamics in Photoexcited MAPbBr

Carpenella, Valentina / Fasolato, Claudia / Di Girolamo, Diego / Barichello, Jessica / Matteocci, Fabio / Petrillo, Caterina / Dini, Danilo / Nucara, Alessandro

The journal of physical chemistry. C, Nanomaterials and interfaces

2023 Volume 127, Issue 45, Page(s) 22097–22104

Abstract: Hybrid organic-inorganic perovskites (HOIPs) have attracted considerable attention in the past years as photoactive materials for low-cost, high-performance photovoltaics. Polaron formation through electron-phonon coupling has been recognized as the ... ...

Abstract	Hybrid organic-inorganic perovskites (HOIPs) have attracted considerable attention in the past years as photoactive materials for low-cost, high-performance photovoltaics. Polaron formation through electron-phonon coupling has been recognized as the leading mechanism governing charge carrier transport and recombination in HOIPs. In this work, two types of MAPbBr
Language	English
Publishing date	2023-11-03
Publishing country	United States
Document type	Journal Article
ISSN	1932-7447
ISSN	1932-7447
DOI	10.1021/acs.jpcc.3c03668
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Infrared Resonance Raman of Bilayer Graphene: Signatures of Massive Fermions and Band Structure on the 2D Peak.

Graziotto, Lorenzo / Macheda, Francesco / Venanzi, Tommaso / Marchese, Guglielmo / Sotgiu, Simone / Ouaj, Taoufiq / Stellino, Elena / Fasolato, Claudia / Postorino, Paolo / Metzelaars, Marvin / Kögerler, Paul / Beschoten, Bernd / Calandra, Matteo / Ortolani, Michele / Stampfer, Christoph / Mauri, Francesco / Baldassarre, Leonetta

Nano letters

2024 Volume 24, Issue 6, Page(s) 1867–1873

Abstract: Few-layer graphene possesses low-energy carriers that behave as massive Fermions, exhibiting intriguing properties in both transport and light scattering experiments. Lowering the excitation energy of resonance Raman spectroscopy down to 1.17 eV, we ... ...

Abstract	Few-layer graphene possesses low-energy carriers that behave as massive Fermions, exhibiting intriguing properties in both transport and light scattering experiments. Lowering the excitation energy of resonance Raman spectroscopy down to 1.17 eV, we target these massive quasiparticles in the split bands close to the
Language	English
Publishing date	2024-02-02
Publishing country	United States
Document type	Journal Article
ISSN	1530-6992
ISSN (online)	1530-6992
DOI	10.1021/acs.nanolett.3c03502
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Article: Sensing tissue engineered cartilage quality with Raman spectroscopy and statistical learning for the development of advanced characterization assays

Power, Laura J / Fasolato, Claudia / Barbero, Andrea / Wendt, David J / Wixmerten, Anke / Martin, Ivan / Asnaghi, M. Adelaide

Biosensors & bioelectronics. 2020 Oct. 15, v. 166

2020

Abstract: Nasal chondrocyte-derived engineered cartilage has been demonstrated to be safe and feasible for the treatment of focal cartilage lesions with promising preliminary evidences of efficacy. To ensure the quality of the products and processes, and to meet ... ...

Abstract	Nasal chondrocyte-derived engineered cartilage has been demonstrated to be safe and feasible for the treatment of focal cartilage lesions with promising preliminary evidences of efficacy. To ensure the quality of the products and processes, and to meet regulatory requirements, quality controls for identity, purity, and potency need to be developed. We investigated the use of Raman spectroscopy, a nondestructive analytical method that measures the chemical composition of samples, and statistical learning methods for the development of quality controls to quantitatively characterize the starting biopsy and final grafts. We provide a proof-of-concept to show how Raman spectroscopy can be used to identify the types of tissues found in a nasal septal biopsy, i.e., hyaline cartilage and perichondrium, for a novel tissue identity assay. The tissues could be classified with a sensitivity of 89% and specificity of 77%. We also show how clinically relevant and mature nasal chondrocyte-derived engineered cartilage can be assessed with Raman spectroscopy for the development of potency assays. The maturity of engineered grafts, based on the quantified ratio of glycosaminoglycans to DNA and histological score, could be accurately assessed (R² = 0.78 and 0.89, respectively, between predicted and measured values). Our results demonstrate the potential of Raman spectroscopy for the development of characterization assays for regenerative therapies that could be integrated into a good manufacturing practice-compliant process.
Keywords	DNA ; Raman spectroscopy ; biopsy ; biosensors ; cartilage ; chemical composition ; glycosaminoglycans ; histology ; manufacturing ; nondestructive methods ; nose ; quality control
Language	English
Dates of publication	2020-1015
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1011023-9
ISSN	1873-4235 ; 0956-5663
ISSN (online)	1873-4235
ISSN	0956-5663
DOI	10.1016/j.bios.2020.112467
Database	NAL-Catalogue (AGRICOLA)

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Article: Advanced Raman Spectroscopy Detection of Oxidative Damage in Nucleic Acid Bases: Probing Chemical Changes and Intermolecular Interactions in Guanosine at Ultralow Concentration

Ripanti, Francesca / Fasolato, Claudia / Mazzarda, Flavia / Palleschi, Simonetta / Ceccarini, Marina / Li, Chunchun / Bignami, Margherita / Bodo, Enrico / Bell, Steven E.J. / Mazzei, Filomena / Postorino, Paolo

Analytical chemistry. 2021 July 29, v. 93, no. 31

2021

Abstract: DNA/RNA synthesis precursors are especially vulnerable to damage induced by reactive oxygen species occurring following oxidative stress. Guanosine triphosphates are the prevalent oxidized nucleotides, which can be misincorporated during replication, ... ...

Abstract	DNA/RNA synthesis precursors are especially vulnerable to damage induced by reactive oxygen species occurring following oxidative stress. Guanosine triphosphates are the prevalent oxidized nucleotides, which can be misincorporated during replication, leading to mutations and cell death. Here, we present a novel method based on micro-Raman spectroscopy, combined with ab initio calculations, for the identification, detection, and quantification of oxidized nucleotides at low concentration. We also show that the Raman signature in the terahertz spectral range (<100 cm–¹) contains information on the intermolecular assembly of guanine in tetrads, which allows us to further boost the oxidative damage detection limit. Eventually, we provide evidence that similar analyses can be carried out on samples in very small volumes at very low concentrations by exploiting the high sensitivity of surface-enhanced Raman scattering combined with properly designed superhydrophobic substrates. These results pave the way for employing such advanced spectroscopic methods for quantitatively sensing the oxidative damage of nucleotides in the cell.
Keywords	DNA ; RNA ; Raman spectroscopy ; analytical chemistry ; cell death ; detection limit ; guanine ; guanosine ; hydrophobicity ; nucleotides ; oxidation ; oxidative stress ; reactive oxygen species
Language	English
Dates of publication	2021-0729
Size	p. 10825-10833.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	1508-8
ISSN	1520-6882 ; 0003-2700
ISSN (online)	1520-6882
ISSN	0003-2700
DOI	10.1021/acs.analchem.1c01049
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Article: Exploring the Potentiality of a SERS-Active pH Nano-Biosensor.

Capocefalo, Angela / Mammucari, Daisy / Brasili, Francesco / Fasolato, Claudia / Bordi, Federico / Postorino, Paolo / Domenici, Fabio

Frontiers in chemistry

2019 Volume 7, Page(s) 413

Abstract: The merging of the molecular specificity of Raman spectroscopy with the extraordinary optical properties of metallic nanoarchitectures is at the heart of Surface Enhanced Raman Spectroscopy (SERS), which in the last few decades proved its worth as ... ...

Abstract	The merging of the molecular specificity of Raman spectroscopy with the extraordinary optical properties of metallic nanoarchitectures is at the heart of Surface Enhanced Raman Spectroscopy (SERS), which in the last few decades proved its worth as powerful analytical tool with detection limits pushed to the single molecule recognition. Within this frame, SERS-based nanosensors for localized pH measurements have been developed and employed for a wide range of applications. Nevertheless, to improve the performances of such nanosensors, many key issues concerning their assembling, calibration and stability, that could significantly impact on the outcome of the pH measurements, need to be clarified. Here, we report on the detailed characterization of a case study SERS-active pH nanosensor, based on the conjugation of gold nanoparticles with the pH-sensitive molecular probe 4-mercaptobenzoic acid (4MBA). We analyzed and optimized all the aspects of the synthesis procedure and of the operating conditions to preserve the sensor stability and provide the highest responsiveness to pH. Exploiting the dependence of the SERS spectrum on the protonation degree of the carboxylic group at the edge of the 4MBA molecules, we derived a calibration curve for the nanosensor. The extrapolated working point, i.e., the pH value corresponding to the highest sensitivity, falls at pH 5.6, which corresponds to the pKa value of the molecule confined at the nanoparticle surface. A shift of the pKa of 4MBA, observed on the molecules confined at the nanostructured interface respect to the bulk counterpart, unveils the opportunity to assembly a SERS-based pH nanosensor with the ability to select its working point in the sensitivity region of interest, by acting on the nanostructured surface on which the molecular probe is confined. As a proof-of-concept, the nanosensor was successfully employed to measure the extracellular pH of normal and cancer cells, demonstrating the capability to discriminate between them.
Language	English
Publishing date	2019-06-07
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2711776-5
ISSN	2296-2646
ISSN	2296-2646
DOI	10.3389/fchem.2019.00413
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Article ; Online: Probing Enhanced Electron-Phonon Coupling in Graphene by Infrared Resonance Raman Spectroscopy.

Venanzi, Tommaso / Graziotto, Lorenzo / Macheda, Francesco / Sotgiu, Simone / Ouaj, Taoufiq / Stellino, Elena / Fasolato, Claudia / Postorino, Paolo / Mišeikis, Vaidotas / Metzelaars, Marvin / Kögerler, Paul / Beschoten, Bernd / Coletti, Camilla / Roddaro, Stefano / Calandra, Matteo / Ortolani, Michele / Stampfer, Christoph / Mauri, Francesco / Baldassarre, Leonetta

Physical review letters

2023 Volume 130, Issue 25, Page(s) 256901

Abstract: We report on resonance Raman spectroscopy measurements with excitation photon energy down to 1.16 eV on graphene, to study how low-energy carriers interact with lattice vibrations. Thanks to the excitation energy close to the Dirac point at K, we unveil ... ...

Abstract	We report on resonance Raman spectroscopy measurements with excitation photon energy down to 1.16 eV on graphene, to study how low-energy carriers interact with lattice vibrations. Thanks to the excitation energy close to the Dirac point at K, we unveil a giant increase of the intensity ratio between the double-resonant 2D and 2D^{'} peaks with respect to that measured in graphite. Comparing with fully ab initio theoretical calculations, we conclude that the observation is explained by an enhanced, momentum-dependent coupling between electrons and Brillouin zone-boundary optical phonons. This finding applies to two-dimensional Dirac systems and has important consequences for the modeling of transport in graphene devices operating at room temperature.
MeSH term(s)	Spectrum Analysis, Raman/methods ; Graphite/chemistry ; Phonons ; Vibration ; Electrons
Chemical Substances	Graphite (7782-42-5)
Language	English
Publishing date	2023-07-07
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.130.256901
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Article ; Online: Sensing tissue engineered cartilage quality with Raman spectroscopy and statistical learning for the development of advanced characterization assays.

Power, Laura J / Fasolato, Claudia / Barbero, Andrea / Wendt, David J / Wixmerten, Anke / Martin, Ivan / Asnaghi, M Adelaide

Biosensors & bioelectronics

2020 Volume 166, Page(s) 112467

Abstract	Nasal chondrocyte-derived engineered cartilage has been demonstrated to be safe and feasible for the treatment of focal cartilage lesions with promising preliminary evidences of efficacy. To ensure the quality of the products and processes, and to meet regulatory requirements, quality controls for identity, purity, and potency need to be developed. We investigated the use of Raman spectroscopy, a nondestructive analytical method that measures the chemical composition of samples, and statistical learning methods for the development of quality controls to quantitatively characterize the starting biopsy and final grafts. We provide a proof-of-concept to show how Raman spectroscopy can be used to identify the types of tissues found in a nasal septal biopsy, i.e., hyaline cartilage and perichondrium, for a novel tissue identity assay. The tissues could be classified with a sensitivity of 89% and specificity of 77%. We also show how clinically relevant and mature nasal chondrocyte-derived engineered cartilage can be assessed with Raman spectroscopy for the development of potency assays. The maturity of engineered grafts, based on the quantified ratio of glycosaminoglycans to DNA and histological score, could be accurately assessed (R
MeSH term(s)	Biosensing Techniques ; Cartilage ; Chondrocytes ; Spectrum Analysis, Raman ; Tissue Engineering
Language	English
Publishing date	2020-07-29
Publishing country	England
Document type	Journal Article
ZDB-ID	1011023-9
ISSN	1873-4235 ; 0956-5663
ISSN (online)	1873-4235
ISSN	0956-5663
DOI	10.1016/j.bios.2020.112467
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: Enhanced coupling between massive fermions and zone-boundary phonons probed by infrared resonance Raman in bilayer graphene

Graziotto, Lorenzo / Macheda, Francesco / Venanzi, Tommaso / Sotgiu, Simone / Ouaj, Taoufiq / Stellino, Elena / Fasolato, Claudia / Postorino, Paolo / Metzelaars, Marvin / Kögerler, Paul / Beschoten, Bernd / Calandra, Matteo / Ortolani, Michele / Stampfer, Christoph / Mauri, Francesco / Baldassarre, Leonetta

2023

Abstract: Few-layer graphene possesses low-energy carriers which behave as massive fermions, exhibiting intriguing properties in both transport and light scattering experiments. By lowering the excitation energy of resonance Raman spectroscopy down to 1.17 eV we ... ...

Abstract	Few-layer graphene possesses low-energy carriers which behave as massive fermions, exhibiting intriguing properties in both transport and light scattering experiments. By lowering the excitation energy of resonance Raman spectroscopy down to 1.17 eV we target these massive quasiparticles in the low-energy split bands close to the K point. The low excitation energy suppresses some of the Raman processes which are resonant in the visible, and induces a clearer frequency-separation of the sub-structures of the resonant 2D peak. Studying the different intensities of the sub-structures and comparing experimental measurements with fully ab initio theoretical calculations, in the case of bilayer graphene we unveil an enhanced coupling between the massive fermions and the lattice vibrations at the K point, in analogy to what found for the massless fermions of monolayer graphene, and also suggesting that what governs the enhancement is the vicinity of the electron-hole pair momentum to K rather than how small the electron-hole pair energy is. Comment: 14 pages, 10 figures
Keywords	Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science
Subject code	535
Publishing date	2023-10-06
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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