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Article ; Online: Nanomaterials in Photo (Electro) Catalysis

Francesca Petronella / Roberto Comparelli

Catalysts, Vol 11, Iss 2, p

2021 Volume 149

Abstract: The increasing rate of water and air pollution dramatically impacts natural ecosystems and human health causing depletion of biodiversity, climate changes, spreading of respiratory diseases, and, as a consequence, negatively impacting the world economy [. ...

Abstract	The increasing rate of water and air pollution dramatically impacts natural ecosystems and human health causing depletion of biodiversity, climate changes, spreading of respiratory diseases, and, as a consequence, negatively impacting the world economy [.]
Keywords	n/a ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Opto-Electronic Characterization of Photocatalysts Based on p , n -Junction Ternary and Quaternary Mixed Oxides Semiconductors (Cu 2 O-In 2 O 3 and Cu 2 O-In 2 O 3 -TiO 2 )

Davide Michele Stefano Marcolongo / Francesco Nocito / Nicoletta Ditaranto / Roberto Comparelli / Michele Aresta / Angela Dibenedetto

Catalysts, Vol 12, Iss 153, p

2022 Volume 153

Abstract: Semiconductor materials are the basis of electronic devices employed in the communication and media industry. In the present work, we report the synthesis and characterization of mixed metal oxides (MOs) as p , n -junction photocatalysts, and demonstrate ...

Abstract	Semiconductor materials are the basis of electronic devices employed in the communication and media industry. In the present work, we report the synthesis and characterization of mixed metal oxides (MOs) as p , n -junction photocatalysts, and demonstrate the correlation between the preparation technique and the properties of the materials. Solid-state UV-visible diffuse reflectance spectroscopy (UV-VIS DRS) allowed for the determination of the light absorption properties and the optical energy gap. X-ray photoelectron spectroscopy (XPS) allowed for the determination of the surface speciation and composition and for the determination of the valence band edge. The opto-electronic behavior was evaluated measuring the photocurrent generated after absorption of chopped visible light in a 3-electrode cell. Scanning electron microscopy (SEM) measurements allowed for auxiliary characterization of size and morphology, showing the formation of composites for the ternary Cu 2 O-In 2 O 3 p , n -mixed oxide, and even more for the quaternary Cu 2 O-In 2 O 3 -TiO 2 MO. Light absorption spectra and photocurrent-time curves mainly depend upon the composition of MOs, while the optical energy gap and defective absorption tail are closely related to the preparation methodology, time and thermal treatment. Qualitative electronic band structures of semiconductors are also presented.
Keywords	p ; n -junction ; mixed oxides ; photocatalysts ; opto-electronic characterization ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
Subject code	290
Language	English
Publishing date	2022-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Understanding the Effect of the Synthetic Method and Surface Chemistry on the Properties of CsPbBr 3 Nanoparticles

Mariangela Giancaspro / Annamaria Panniello / Nicoletta Depalo / Roberto Comparelli / Marinella Striccoli / Maria Lucia Curri / Elisabetta Fanizza

Nanomaterials, Vol 14, Iss 1, p

2023 Volume 81

Abstract: Over the last decade, the attractive properties of CsPbBr 3 nanoparticles (NPs) have driven ever-increasing progress in the development of synthetic procedures to obtain high-quality NPs at high concentrations. Understanding how the properties of NPs are ...

Abstract	Over the last decade, the attractive properties of CsPbBr 3 nanoparticles (NPs) have driven ever-increasing progress in the development of synthetic procedures to obtain high-quality NPs at high concentrations. Understanding how the properties of NPs are influenced by the composition of the reaction mixture in combination with the specific synthetic methodology is crucial, both for further elucidating the fundamental characteristics of this class of materials and for their manufacturing towards technological applications. This work aims to shed light on this aspect by synthesizing CsPbBr 3 NPs by means of two well-assessed synthetic procedures, namely, hot injection (HI) and ligand-assisted reprecipitation (LARP) in non-polar solvents, using PbBr 2 and Cs 2 CO 3 as precursors in the presence of already widely investigated ligands. The overall goal is to study and compare the properties of the NPs to understand how each synthetic method influences the NPs’ size and/or the optical properties. Reaction composition and conditions are purposely tuned towards the production of nanocubes with narrow size distribution, high emission properties, and the highest achievable concentration. As a result, the formation of bulk crystals as precipitate in LARP limits the achievement of a highly concentrated NP solution. The size of the NPs obtained by LARP seems to be poorly affected by the ligands’ nature and the excess bromide, as consequence of bromide-rich solvation agents, effectively results in NPs with excellent emission properties. In contrast, NPs synthesized by HI exhibit high reaction yield, diffusion growth-controlled size, and less striking emission properties, probably ascribed to a bromide-deficient condition.
Keywords	surface passivation ; CsPbBr 3 nanoparticles ; hot injection approach ; ligand-assisted reprecipitation in polar solvent-free synthetic method ; Chemistry ; QD1-999
Subject code	540
Language	English
Publishing date	2023-12-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Photocatalytic Investigation of Aerosol-Assisted Atmospheric Pressure Plasma Deposited Hybrid TiO 2 Containing Nanocomposite Coatings

Chiara Lo Porto / Massimo Dell’Edera / Ilaria De Pasquale / Antonella Milella / Francesco Fracassi / Maria Lucia Curri / Roberto Comparelli / Fabio Palumbo

Nanomaterials, Vol 12, Iss 3758, p

2022 Volume 3758

Abstract: We report on the aerosol-assisted atmospheric-pressure plasma deposition onto a stainless-steel woven mesh of a thin nanocomposite coating based on TiO 2 nanoparticles hosted in a hybrid organic–inorganic matrix, starting from nanoparticles dispersed in ... ...

Abstract	We report on the aerosol-assisted atmospheric-pressure plasma deposition onto a stainless-steel woven mesh of a thin nanocomposite coating based on TiO 2 nanoparticles hosted in a hybrid organic–inorganic matrix, starting from nanoparticles dispersed in a mixture of hexamethyldisiloxane and isopropyl alcohol. The stainless-steel mesh was selected as an effective support for the possible future technological application of the coating for photocatalytically assisted water depollution. The prepared coatings were thoroughly investigated from the chemical and morphological points of view and were demonstrated to be photocatalytically active in the degradation of an organic molecule, used as a pollutant model, in water upon UV light irradiation. In order to optimize the photocatalytic performance, different approaches were investigated for the coating’s realization, namely (i) the control of the deposition time and (ii) the application of a postdeposition O 2 plasma treatment on the pristine coatings. Both strategies were found to be able to increase the photocatalytic activity, and, remarkably, their combination resulted in a further enhancement of the photoactivity. Indeed, the proposed combined approach allowed a three-fold increase in the kinetic constant of the degradation reaction of the model dye methylene blue with respect to the pristine coating. Interestingly, the chemical and morphological characterizations of all the prepared coatings were able to account for the enhancement of the photocatalytic performance. Indeed, the presence of the TiO 2 nanoparticles on the outmost surface of the film confirmed the accessibility of the photocatalytic sites in the nanocomposite and reasonably explained the enhanced photocatalytic performance. In addition, the sustained photoactivity (>5 cycles of use) of the nanocomposites was demonstrated.
Keywords	plasma deposition ; nanocomposite coating ; TiO 2 ; photocatalysis ; aerosol-assisted plasma ; Chemistry ; QD1-999
Subject code	620
Language	English
Publishing date	2022-10-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Atmospheric Pressure Plasma Deposition of Hybrid Nanocomposite Coatings Containing TiO 2 and Carbon-Based Nanomaterials

Regina Del Sole / Chiara Lo Porto / Sara Lotito / Chiara Ingrosso / Roberto Comparelli / Maria Lucia Curri / Gianni Barucca / Francesco Fracassi / Fabio Palumbo / Antonella Milella

Molecules, Vol 28, Iss 5131, p

2023 Volume 5131

Abstract: Among the different applications of TiO 2 , its use for the photocatalytic abatement of organic pollutants has been demonstrated particularly relevant. However, the wide band gap (3.2 eV), which requires UV irradiation for activation, and the fast ... ...

Abstract	Among the different applications of TiO 2 , its use for the photocatalytic abatement of organic pollutants has been demonstrated particularly relevant. However, the wide band gap (3.2 eV), which requires UV irradiation for activation, and the fast electron-hole recombination rate of this n-type semiconductor limit its photocatalytic performance. A strategy to overcome these limitations relies on the realization of a nanocomposite that combines TiO 2 nanoparticles with carbon-based nanomaterials, such as rGO (reduced graphene oxide) and fullerene (C 60 ). On the other hand, the design and realization of coatings formed of such TiO 2 -based nanocomposite coatings are essential to make them suitable for their technological applications, including those in the environmental field. In this work, aerosol-assisted atmospheric pressure plasma deposition of nanocomposite coatings containing both TiO 2 nanoparticles and carbon-based nanomaterials, as rGO or C 60 , in a siloxane matrix is reported. The chemical composition and morphology of the deposited films were investigated for the different types of prepared nanocomposites by means of FT-IR, FEG-SEM, and TEM analyses. The photocatalytic activity of the nanocomposite coatings was evaluated through monitoring the photodegradation of methylene blue (MB) as a model organic pollutant. Results demonstrate that the nanocomposite coatings embedding rGO or C 60 show enhanced photocatalytic performance with respect to the TiO 2 counterpart. In particular, TiO 2 /C 60 nanocomposites allow to achieve 85% MB degradation upon 180 min of UV irradiation.
Keywords	plasma deposition ; nanocomposite coating ; TiO 2 ; photocatalysis ; aerosol-assisted plasma ; carbon nanomaterials ; Organic chemistry ; QD241-441
Subject code	620
Language	English
Publishing date	2023-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Photocatalytic TiO 2 -Based Nanostructured Materials for Microbial Inactivation

Ilaria De Pasquale / Chiara Lo Porto / Massimo Dell’Edera / Francesca Petronella / Angela Agostiano / Maria Lucia Curri / Roberto Comparelli

Catalysts, Vol 10, Iss 1382, p

2020 Volume 1382

Abstract: Pathogenic microorganisms can spread throughout the world population, as the current COVID-19 pandemic has dramatically demonstrated. In this scenario, a protection against pathogens and other microorganisms can come from the use of photoactive materials ...

Abstract	Pathogenic microorganisms can spread throughout the world population, as the current COVID-19 pandemic has dramatically demonstrated. In this scenario, a protection against pathogens and other microorganisms can come from the use of photoactive materials as antimicrobial agents able to hinder, or at least limit, their spreading by means of photocatalytically assisted processes activated by light—possibly sunlight—promoting the formation of reactive oxygen species (ROS) that can kill microorganisms in different matrices such as water or different surfaces without affecting human health. In this review, we focus the attention on TiO 2 nanoparticle-based antimicrobial materials, intending to provide an overview of the most promising synthetic techniques, toward possible large-scale production, critically review the capability of such materials to promote pathogen (i.e., bacteria, virus, and fungi) inactivation, and, finally, take a look at selected technological applications.
Keywords	TiO 2 ; photocatalysis ; nanoparticles ; pathogens ; bacteria ; virus ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
Subject code	660
Language	English
Publishing date	2020-11-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Surface Engineering of Gold Nanorods for Cytochrome c Bioconjugation

Tiziana Placido / Lorenzo Tognaccini / Barry D. Howes / Alessandro Montrone / Valentino Laquintana / Roberto Comparelli / M. Lucia Curri / Giulietta Smulevich / Angela Agostiano

ACS Omega, Vol 3, Iss 5, Pp 4959-

An Effective Strategy To Preserve the Protein Structure

2018 Volume 4967

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2018-05-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
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Article ; Online: Low Temperature Synthesis of Photocatalytic Mesoporous TiO 2 Nanomaterials

Massimo Dell’Edera / Francesca Petronella / Alessandra Truppi / Leonarda Francesca Liotta / Nunzio Gallì / Teresa Sibillano / Cinzia Giannini / Rosaria Brescia / Francesco Milano / Marinella Striccoli / Angela Agostiano / M. Lucia Curri / Roberto Comparelli

Catalysts, Vol 10, Iss 893, p

2020 Volume 893

Abstract: We report the synthesis of mesoporous TiO 2 nanostructures based on the decomposition of TiOSO 4 in aqueous alkaline solution at room temperature, followed by mild thermal treatment (110 °C) in an oven and suitable to yield up to 40 g of product per ... ...

Abstract	We report the synthesis of mesoporous TiO 2 nanostructures based on the decomposition of TiOSO 4 in aqueous alkaline solution at room temperature, followed by mild thermal treatment (110 °C) in an oven and suitable to yield up to 40 g of product per batch. The duration of the thermal treatment was found to be crucial to control crystalline phase composition, specific surface area, surface chemistry and, accordingly, the photocatalytic properties of the obtained TiO 2 nanocrystals. The thorough investigation of the prepared samples allowed us to explain the relationship between the structure of the obtained nanoparticles and their photocatalytic behavior, that was tested in a model reaction. In addition, the advantage of the mild treatment against a harsher calcination at 450 °C was illustrated. The proposed approach represents a facile and sustainable route to promptly access an effective photocatalyst, thus holding a significant promise for the development of solutions suitable to real technological application in environmental depollution.
Keywords	titanium dioxide ; photocatalysis ; nanoparticles ; mesoporous ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
Subject code	620
Language	English
Publishing date	2020-08-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: PbS Quantum Dots Decorating TiO 2 Nanocrystals

Carlo Nazareno Dibenedetto / Teresa Sibillano / Rosaria Brescia / Mirko Prato / Leonardo Triggiani / Cinzia Giannini / Annamaria Panniello / Michela Corricelli / Roberto Comparelli / Chiara Ingrosso / Nicoletta Depalo / Angela Agostiano / Maria Lucia Curri / Marinella Striccoli / Elisabetta Fanizza

Molecules, Vol 25, Iss 2939, p

Synthesis, Topology, and Optical Properties of the Colloidal Hybrid Architecture

2020 Volume 2939

Abstract: Fabrication of heterostructures by merging two or more materials in a single object. The domains at the nanoscale represent a viable strategy to purposely address materials’ properties for applications in several fields such as catalysis, biomedicine, ... ...

Abstract	Fabrication of heterostructures by merging two or more materials in a single object. The domains at the nanoscale represent a viable strategy to purposely address materials’ properties for applications in several fields such as catalysis, biomedicine, and energy conversion. In this case, solution-phase seeded growth and the hot-injection method are ingeniously combined to fabricate TiO 2 /PbS heterostructures. The interest in such hybrid nanostructures arises from their absorption properties that make them advantageous candidates as solar cell materials for more efficient solar light harvesting and improved light conversion. Due to the strong lattice mismatch between TiO 2 and PbS, the yield of the hybrid structure and the control over its properties are challenging. In this study, a systematic investigation of the heterostructure synthesis as a function of the experimental conditions (such as seeds’ surface chemistry, reaction temperature, and precursor concentration), its topology, structural properties, and optical properties are carried out. The morphological and chemical characterizations confirm the formation of small dots of PbS by decorating the oleylamine surface capped TiO 2 nanocrystals under temperature control. Remarkably, structural characterization points out that the formation of heterostructures is accompanied by modification of the crystallinity of the TiO 2 domain, which is mainly ascribed to lattice distortion. This result is also confirmed by photoluminescence spectroscopy, which shows intense emission in the visible range. This originated from self-trapped excitons, defects, and trap emissive states.
Keywords	colloidal heterostructures ; seed mediated growth ; heterogeneous nucleation ; PbS/TiO2 heterostructure ; TiO2 nanocrystal defects ; Organic chemistry ; QD241-441
Subject code	620
Language	English
Publishing date	2020-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: NIR-Absorbing Mesoporous Silica-Coated Copper Sulphide Nanostructures for Light-to-Thermal Energy Conversion

Nanomaterials, Vol 12, Iss 15, p

2022 Volume 2545

Abstract: Plasmonic nanostructures, featuring near infrared (NIR)-absorption, are rising as efficient nanosystems for in vitro photothermal (PT) studies and in vivo PT treatment of cancer diseases. Among the different materials, new plasmonic nanostructures based ... ...

Abstract	Plasmonic nanostructures, featuring near infrared (NIR)-absorption, are rising as efficient nanosystems for in vitro photothermal (PT) studies and in vivo PT treatment of cancer diseases. Among the different materials, new plasmonic nanostructures based on Cu 2−x S nanocrystals (NCs) are emerging as valuable alternatives to Au nanorods, nanostars and nanoshells, largely exploited as NIR absorbing nanoheaters. Even though Cu 2−x S plasmonic properties are not linked to geometry, the role played by their size, shape and surface chemistry is expected to be fundamental for an efficient PT process. Here, Cu 2−x S NCs coated with a hydrophilic mesoporous silica shell (MSS) are synthesized by solution-phase strategies, tuning the core geometry, MSS thickness and texture. Besides their loading capability, the silica shell has been widely reported to provide a more robust plasmonic core protection than organic molecular/polymeric coatings, and improved heat flow from the NC to the environment due to a reduced interfacial thermal resistance and direct electron–phonon coupling through the interface. Systematic structural and morphological analysis of the core-shell nanoparticles and an in-depth thermoplasmonic characterization by using a pump beam 808 nm laser, are carried out. The results suggest that large triangular nanoplates (NPLs) coated by a few tens of nanometers thick MSS, show good photostability under laser light irradiation and provide a temperature increase above 38 °C and a 20% PT efficiency upon short irradiation time (60 s) at 6 W/cm 2 power density.
Keywords	plasmonic nanostructures ; Cu 2−x S nanocrystals ; mesoporous silica ; photothermal properties ; Chemistry ; QD1-999
Subject code	620
Language	English
Publishing date	2022-07-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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