Stefania Porcu

Dr. Stefania Porcu

Department of Physics, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato, Italy
orcid

Research Focus & Metrics

Academic Career Length

9Years (2018-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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12 October 2022 in Molecules
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Stefania PorcuStefania Porcu
Stefania Porcu
FSFrancesco Secci
Francesco Secci
Pier Carlo Ricci, Ph.D.Pier Carlo Ricci, Ph.D.
Pier Carlo Ricci, Ph.D.
Heterogeneous photocatalysts have garnered extensive attention as a sustainable way for environmental remediation and energy storage process. Water splitting, solar energy conversion, and pollutant degradation are examples of nowadays applications where semiconductor-based photocatalysts represent a potentially disruptive technology. The exploitation of solar radiation for photocatalysis could generate a strong impact by decreasing the energy demand and simultaneously mitigating the impact of anthropogenic pollutants. However, most of the actual photocatalysts work only on energy radiation in the Near-UV region (<400 nm), and the studies and development of new photocatalysts with high efficiency in the visible range of the spectrum are required. In this regard, hybrid organic/inorganic photocatalysts have emerged as highly potential materials to drastically improve visible photocatalytic efficiency. In this review, we will analyze the state-of-art and the developments of hybrid photocatalysts for energy storage and energy conversion process as well as their application in pollutant degradation and water treatments.

12 April 2023 in Nanomaterials
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Chiara OllaChiara Olla
Chiara Olla
ACAntonio Cappai
Antonio Cappai
Stefania PorcuStefania Porcu
Stefania Porcu
LSLuigi Stagi
Luigi Stagi
MFMarzia Fantauzzi
Marzia Fantauzzi
CARLO MARIA CARBONAROCARLO MARIA CARBONARO
CARLO MARIA CARBONARO
The differences between bare carbon dots (CDs) and nitrogen-doped CDs synthesized from citric acid as a precursor are investigated, aiming at understanding the mechanisms of emission and the role of the doping atoms in shaping the optical properties. Despite their appealing emissive features, the origin of the peculiar excitation-dependent luminescence in doped CDs is still debated and intensively being examined. This study focuses on the identification of intrinsic and extrinsic emissive centers by using a multi-technique experimental approach and computational chemistry simulations. As compared to bare CDs, nitrogen doping causes the decrease in the relative content of O-containing functional groups and the formation of both N-related molecular and surface centers that enhance the quantum yield of the material. The optical analysis suggests that the main emission in undoped nanoparticles comes from low-efficient blue centers bonded to the carbogenic core, eventually with surface-attached carbonyl groups, the contribution in the green range being possibly related to larger aromatic domains. On the other hand, the emission features of N-doped CDs are mainly due to the presence of N-related molecules, with the computed absorption transitions calling for imidic rings fused to the carbogenic core as the potential structures for the emission in the green range.

18 July 2022 in Analytical Chemistry
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Stefania PorcuStefania Porcu
Stefania Porcu
ETEnrica Tuveri
Enrica Tuveri
MPMarco Palanca
Marco Palanca
CMClaudia Melis
Claudia Melis
IFIgnazio Macellaro La Franca
Ignazio Macellaro La Franca
Pier Carlo Ricci, Ph.D.Pier Carlo Ricci, Ph.D.
Pier Carlo Ricci, Ph.D.
The need to find a rapid and worthwhile technique for the in situ detection of the content of delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD) in Cannabis sativa L. is an ever-increasing problem in the forensic field. Among all the techniques for the detection of cannabinoids, Raman spectroscopy can be identified as the most cost-effective, fast, noninvasive, and nondestructive. In this study, 42 different samples were analyzed using Raman spectroscopy with 1064 nm excitation wavelength. The use of an IR wavelength laser showed the possibility to clearly identify THC and CBD in fresh samples, without any further processing, knocking out the contribution of the fluorescence generated by visible and near-IR sources. The results allow assigning all the Raman features in THC- and CBD-rich natural samples. The multivariate analysis underlines the high reproducibility of the spectra and the possibility to distinguish immediately the Raman spectra of the two cannabinoid species. Furthermore, the ratio between the Raman bands at 1295/1440 and 1623/1663 cm-1 is identified as an immediate test parameter to evaluate the THC content in the samples.

12 November 2018 in Chemical Communications
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Stefania PorcuStefania Porcu
Stefania Porcu
ALAlberto Luridiana
Alberto Luridiana
AMAlberto Martis
Alberto Martis
Angelo FrongiaAngelo Frongia
Angelo Frongia
GSGiorgia Sarais
Giorgia Sarais
FSFrancesco Secci
Francesco Secci
A general strategy for the synthesis of arylthio cyclopropyl carbaldehydes and ketones via a Brønsted acid catalyzed arylthiol addition/ring contraction reaction sequence has been exploited. The procedure led to a wide panel of cyclopropyl carbaldehydes in generally high yields and with broad substrate scope. Mechanistic aspects and synthetic applications of this procedure were investigated.

22 April 2020 in Organic & Biomolecular Chemistry
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FSFrancesco Secci
Francesco Secci
Stefania PorcuStefania Porcu
Stefania Porcu
ALAlberto Luridiana
Alberto Luridiana
Angelo FrongiaAngelo Frongia
Angelo Frongia
Pier Carlo Ricci, Ph.D.Pier Carlo Ricci, Ph.D.
Pier Carlo Ricci, Ph.D.
A continuous flow Norrish–Yang photocyclization of 1,2-diketones has been developed and applied to the synthesis of functionalized 2-hydroxycyclobutanones, under blue light irradiation.

11 August 2022 in Materials
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FPFrancesca Assunta Pisu
Francesca Assunta Pisu
Pier Carlo Ricci, Ph.D.Pier Carlo Ricci, Ph.D.
Pier Carlo Ricci, Ph.D.
Stefania PorcuStefania Porcu
Stefania Porcu
CARLO MARIA CARBONAROCARLO MARIA CARBONARO
CARLO MARIA CARBONARO
Daniele ChiriuDaniele Chiriu
Daniele Chiriu
Cadmium yellow degradation afflicts numerous paintings realized between the XIXth and XXth centuries. The degradation process and its kinetics is not completely understood. It consists of chalking, lightening, flaking, spalling, and, in its most deteriorated cases, the formation of a crust over the original yellow paint. In order to improve the comprehension of the process, mock-up samples of CdS in yellow and orange tonalities were studied by means of structural analysis and optical characterization, with the principal techniques used in the field of cultural heritage. Mock ups were artificially degraded with heat treatment and UV exposure. Relevant colorimetric variation appears in CIE Lab coordinates from reflectance spectra. XRD, SEM-EDS, and Raman spectroscopy revealed the formation of cadmium sulfate, whilst time-resolved photoluminescence and pump–probe transient absorption spectroscopy suggest the formation of a defective phase, compatible with Cd vacancies and the formation of both CdO and CdSO4 superficial clusters.