Article
Chemistry, Multidisciplinary
Shumpei Sadai, Yoshifumi Hashikawa, Yasujiro Murata
Summary: Two open-[60]fullerene-aniline conjugates were synthesized by incorporating diamine into [60]fullerene, resulting in the formation of thiazolidine-2-thione ring in the presence of CS2. The absorption edge was significantly shifted to 1200 nm by increasing the number of N,N-dimethylaniline moieties, indicating strong acceptor-donor interactions.
Article
Chemistry, Multidisciplinary
Sajini D. Hettiarachchi, Emel Kirbas Cilingir, Heidi Maklouf, Elif S. Seven, Suraj Paudyal, Steven Vanni, Regina M. Graham, Roger M. Leblanc
Summary: This study compared three different covalent carbon dots systems for doxorubicin release and cancer cell viability under acidic and physiological conditions. Results indicated that the pH stimuli C-dots-HBA-dox system showed the highest efficacy in doxorubicin release in acidic pH, while the redox stimuli C-dots-S-S-dox system performed well in physiological conditions.
Article
Chemistry, Multidisciplinary
Divambal Appavoo, Komal Bhardwaj, Samarendra P. P. Singh, Emmanuel N. N. Koukaras, Rachana Kumar, Bimlesh Lochab
Summary: In this study, covalently linked fullerene adducts were designed and synthesized, showing potential applications in organic optoelectronic devices. Experimental and theoretical results confirmed that these fullerene adducts have suitable bandgaps, good electronic conductivity, and solubility, as well as easy charge transfer. These features are beneficial for optimizing the performance of optoelectronic devices.
Article
Biochemistry & Molecular Biology
Piotr Piotrowski, Wojciech Mech, Kamila Zarebska, Maciej Krajewski, Krzysztof P. Korona, Maria Kaminska, Magdalena Skompska, Andrzej Kaim
Summary: In this study, six (two new) fullerene mono- and di-pyrene derivatives based on C-60 and C-70 fullerenes were successfully synthesized and characterized using spectral methods and cyclic voltammetry. The efficiency of solar cells made of these derivatives was analyzed, and it was found that the electronic and spectral properties of the derivatives, as well as the homogeneity of the photovoltaic layer, play a crucial role in determining the efficiency of the constructed solar cells.
Article
Chemistry, Physical
T. V. Pavlova, V. M. Shevlyuga, B. V. Andryushechkin, K. N. Eltsov
Summary: This study reports the removal of individual halogen atoms from Si(100)-2x1-Cl and -Br surfaces in STM. The charge states of DBs formed on the Si surface can be manipulated, allowing for tuning the reactivity of the Cl- and Br-terminated surfaces.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Coatings & Films
M. Chrysler, J. C. Jiang, G. Lorkowski, E. I. Meletis, J. H. Ngai
Summary: This study explores the epitaxial growth of SrTiO3 on lithographically patterned Si (100) substrates to achieve deposition-last, lithographically defined oxide devices on Si. Instead of using a physical hard mask on top of the substrate prior to epitaxial growth, a pseudomask is created by texturing the Si substrate surface itself. The Si is textured through a combination of reactive ion etching and wet-etching. Desorbing the native SiOx at high temperatures prior to epitaxial growth presents no complications as the patterned substrate is comprised entirely of Si. The inverted profile of the epitaxial oxide device layer above the textured pseudomask circumvents shadowing during deposition, providing a pathway for highly scaled devices.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Nanoscience & Nanotechnology
Xiji Shao, Lin Li, Sizhao Huang, Zhenjun Song, Kedong Wang
Summary: The controllability of magnetic moments of 3d transition metal atoms adsorbed on the Si(100) surface was studied using first-principles calculations. It was found that encapsulating the TM atoms in C-60 or C-70 cages can preserve their magnetic moments, isolating them from direct hybridization with the substrate. The presence of linear dispersion around the Fermi level was attributed to the stronger protecting effect of C-70.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Antti Aarela, Kati Rasanen, Patrik Holm, Harri Salo, Pasi Virta
Summary: An ideal therapeutic antibody-oligonucleotide conjugate (AOC) should have a uniform structure, a high oligonucleotide (ON) payload, and retain the antibody (Ab)-mediated binding properties for efficient delivery to the target site. In this study, [60]fullerene-based molecular spherical nucleic acids (MSNAs) were site-specifically conjugated to antibodies (Abs), and their Ab-mediated cellular targeting and binding properties were investigated. The AOCs obtained through glycan engineering and click chemistries showed uniformity, with a high ON:Ab ratio of 24:1 and retained antigen binding properties. Moreover, Ab-mediated endocytosis was demonstrated in HER2 overexpressing breast carcinoma cells, and the effect on cell proliferation was analyzed using live-cell imaging.
ACS APPLIED BIO MATERIALS
(2023)
Article
Computer Science, Information Systems
Sergio Colangeli, Walter Ciccognani, Patrick Ettore Longhi, Lorenzo Pace, Julien Poulain, Remy Leblanc, Ernesto Limiti
Summary: This paper reports the extraction of reliable linear models for two advanced GaN-on-Si HEMT technologies, including nondestructive methods for determining extrinsic resistances and optimization-based approaches for extracting parasitic elements. By supporting standard DC and RF measurements and applying noise-temperature methods, scalable equivalent-circuit and noise models are obtained for the two processes, demonstrating the maturity of the processes and the effectiveness of gate length reduction.
Article
Materials Science, Multidisciplinary
Salizhan Kylychbekov, Yaran Allamyradov, Zikrulloh Khuzhakulov, Inomjon Majidov, Simran Banga, Justice ben Yosef, Liviu Duta, Ali Oguz Er
Summary: This study investigated the effects of substrate temperature and ablation wavelength/mechanism on the properties of hydroxyapatite (HA) coatings. The results indicated that increasing temperature led to increased crystallinity of the coatings. However, temperatures above 700℃ negatively affected protein adsorption and adhesion properties of the coatings.
Article
Engineering, Electrical & Electronic
Po-Ching Wu, Yu-Chang Lai, Pei-Ing Lee, Meng-Ting Chiang, Justin Chou, Tung-Han Chuang
Summary: An innovative Ag film with ultra-high twin density was proposed for improving the performance of backside metallization for power electronic devices. Experimental results indicated that nanotwinned Ag films sputtered on Si wafers with and without a Ti thin film showed improved adhesion and hardness at the Ag/Si interface, with significant differences in twin boundaries and grain boundaries.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Truong Ba Tai, Jihoon Son, Hyeyoung Shin
Summary: In this study, we theoretically investigated the reaction mechanisms during the atomic layer deposition (ALD) of HfO2 thin film on silicon (Si) surface. We found that controlling the concentration of hydroxyl groups on the surface is crucial for enhancing the activity of the ligand-exchange reactions (LERs) and promoting HfO2-ALD.
APPLIED SURFACE SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Guo Zhu, Mengxin Han, Baijun Xiao, Zhiyin Gan
Summary: Sputtered Cu/Si thin films were prepared at different sputtering pressures, and their characteristics were analyzed using XRD and AFM. A simulation approach for magnetron sputtering deposition was proposed, which involved MC and MD methods to simulate sputtered atom transport and deposition. The experimental and simulation results were consistent, showing that decreasing the sputtering pressure resulted in smoother Cu thin films and improved crystal quality. This work provides a realistic simulation scheme and theoretical guidance for the preparation of high-quality sputtered films.
Article
Chemistry, Physical
Yutaka Ikeda, Yuki Cho, Yoichi Murakami
Summary: This study achieved a high power generation density of up to 10 W m(-2) during liquid forced convection cooling of a 170 degrees C surface, demonstrating the feasibility of thermogalvanic conversion. By utilizing a microchannel concept, high heat transfer coefficients and large interelectrode temperature differences were achieved, enabling effective power recovery based on liquid cooling.
SUSTAINABLE ENERGY & FUELS
(2021)
Article
Physics, Multidisciplinary
S. R. Mohanty, A. Kar, S. Paul, K. S. R. Menon
Summary: The initial stages of room temperature growth of Pb overlayers on commercial Si(100) p(2 x 1) surface have been investigated using low-energy electron diffraction and low-energy electron microscopy (LEEM) techniques. A well-ordered reconstructed Si(100) p(10 x 2) surface phase has been observed for 0.5 monolayers of Pb deposition and is found to vanish for higher Pb coverages. We do not observe any island formation in our LEEM studies during the early stages of growth, unlike earlier studies on low-miscut substrates. Our dark-field LEEM experiments suggest the observed high step density with low terrace widths is responsible for this behaviour.
INDIAN JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Jacopo Dosso, Beatrice Bartolomei, Nicola Demitri, Fernando P. Cossio, Maurizio Prato
Summary: The synthesis and isolation of a rare pi-extended diamagnetic phenazine dication have been achieved by oxidizing a phenanthrene-based dihydrophenazine precursor. The resulting dication showed an aromatic distorted structure and electrochromic change in the UV-vis spectrum. The dication was proven to be aromatic theoretically and exhibited dual reactivity, contracting to a p-extended triarylimidazolinium or reducing to the dihydrophenazine precursor, providing insights into the reactivity and properties of extended dicationic PAHs. The reversible conformational change of the molecule opens potential applications as molecular switches and actuators.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Organic
Deborah Romito, Leonardo Amendolare, Krishnan K. Kalathil, Davide Bonifazi
Summary: This work describes the synthesis of a new series of benzotellurazoles with a phenyl ring in 2-position, functionalized with ethoxy chains. The differences in self-assembly and photophysical properties are determined by the number and position of these functional groups. The theoretical calculations indicate that the presence of ethoxy chains leads to red-shifts in absorption peaks and significant changes in chemical shifts of Te-125 NMR spectra.
SYNTHESIS-STUTTGART
(2023)
Article
Chemistry, Physical
Irene Ferrari, Alessandro Motta, Robertino Zanoni, Francesca Anna Scaramuzzo, Francesco Amato, Enrique A. Dalchiele, Andrea Giacomo Marrani
Summary: This study investigates the nature and interactions of oxygen functional groups in graphene oxide, providing insights into their electrochemical reduction energetics. Chemical modifications of graphene oxide under controlled electrochemical reduction conditions were studied to understand the contribution of single reactive oxygen functional groups. X-ray photoelectron spectroscopic analysis and theoretical modeling were used to characterize the various carbonaceous species involved in the rich chemistry of graphene oxide.
Article
Chemistry, Multidisciplinary
Oliwia Matuszewska, Tommaso Battisti, Ruben R. Ferreira, Nicolas Biot, Nicola Demitri, Cecile Meziere, Magali Allain, Marc Salle, Samuel Manas-Valero, Eugenio Coronado, Elisa Fresta, Ruben D. Costa, Davide Bonifazi
Summary: Peri-thiaxanthenothiaxanthene is a sulfur-doped derivative of peri-xanthenoxanthene, which can be used to manipulate the properties of semiconductor materials by adjusting the oxidation state of the sulfur atoms. Chemical and electrochemical oxidation of peri-thiaxanthenothiaxanthene resulted in the formation of sulfoxide, sulfone, and sulfonium derivatives. These derivatives exhibited unique molecular and solid-state arrangements, with face-to-face pi-pi stacking organization. The optical bandgap of the compounds increased as the sulfur atoms were progressively oxidized, with the bis-sulfone derivative displaying the widest bandgap. The MV complexes showed high conductivity at room temperature, making them promising for semiconductor applications. Additionally, the electroluminescence properties of the complexes were tested, and they were found to be the first sulfur-doped mid-emitting PAH-based light-emitting electrochemical cells.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Deborah Romito, Davide Bonifazi
Summary: In order to prepare one-dimensional chalcogen-bonded supramolecular polymers in the solid state, different synthesis methods were explored to obtain ditopic molecular modules. Te-ligand rings were initially chosen as recognition units due to their ability to self-assemble through double Te center dot center dot center dot N chalcogen bonds. Another synthetic strategy involved the preparation of pyridyl-modified ebselen Te-containing analogues, but unexpected Te-containing lactone and spiro-type Te(IV)-containing derivatives were obtained instead.
HELVETICA CHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Francesco Amato, Alessandro Motta, Leonardo Giaccari, Roberto Di Pasquale, Francesca Anna Scaramuzzo, Robertino Zanoni, Andrea Giacomo Marrani
Summary: Graphene and its derivative, reduced graphene oxide (RGO), are attracting great interest due to their unique properties. However, the tendency of RGO to aggregate in water restricts its application. In this study, water-dispersible RGO was prepared through a novel method using graphene oxide (GO) enriched with additional carboxyl groups and followed by chemical reduction. The reactivity of GO with succinic anhydride was experimentally investigated and confirmed through various techniques. This method offers a sustainable and scalable approach for the preparation of water-dispersible RGO, which could have broad applications.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Physical
Valentina Palmieri, Francesco Amato, Andrea Giacomo Marrani, Ginevra Friggeri, Giordano Perini, Alberto Augello, Marco De Spirito, Massimiliano Papi
Summary: Graphene Oxide (GO) is an oxidized form of graphene that contains various oxygen functional groups. The solubility of GO in water makes it an ideal material in the biomedical field, but the synthesis methods used can affect the balance of oxygen groups and the impact on cells. Spectroscopic techniques are commonly used to characterize GO, but they have limitations in indicating its reactivity with polymers or biological media. In this study, a colorimetric method based on GO's reactivity with copper ions was developed to evaluate the oxidation degree and accessibility of polymeric samples. This technique will be crucial for scaffold characterization in tissue engineering and studying interactions between GO-related materials and biological entities.
APPLIED SURFACE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Iaroslav Gnilitskyi, Stefano Bellucci, Andrea Giacomo Marrani, Mariana Shepida, Artur Mazur, Galyna Zozulya, Vasyl Kordan, Volodymyr Babizhetskyy, Bouchta Sahraoui, Orest Kuntyi
Summary: The study investigates the effect of laser-induced copper surface modification on the CO2 reduction rate in acetonitrile-Bu4NClO4 solution. By using a certain number of laser pulses, laser-induced periodic surface structures (LIPSS) consisting of grooves and spikes are formed. It is found that a higher number of laser pulses leads to a larger surface area of the copper cathode, a preferred platy orientation of the copper surface on [022] crystallographic direction, and an increased content of copper (I) oxide on the surface. Moreover, a tendency towards larger fluence values is observed, which promotes the increase in cathodic current density for CO2 reduction.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Daniela Giacco, Tomas Skala, Sergio Brutti, Andrea G. Marrani
Summary: Li-O-2 redox chemistry in aprotic electrolytes shows great potential for improving the performance of secondary batteries. This study investigates the role of a nanoneedle-structured nickel cobaltite doped with chromium as an electrocatalyst for Li-O-2 cells. The analysis reveals the electronic structure and surface chemistry changes of the material during operation, providing insights into the role of mixed valence transition metals and the involvement of Ni2+/3+ centers in the electrocatalytic processes.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Cristian De Luca, Davide Zanetti, Tommaso Battisti, Ruben R. Ferreira, Sofia Lopez, Alexander H. Mcmillan, Sasha Cai Lesher-Perez, Laura Maggini, Davide Bonifazi
Summary: In this study, the photocatalyzed Birch-type reduction of acenes using visible blue light irradiation at room temperature in the presence of air was achieved by utilizing the strong photoreductive properties of PXX. Immobilization of PXX onto PDMS beads allowed for batch reactions and continuous-flow reduction of acenes.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Francesco Amato, Giordano Perini, Ginevra Friggeri, Alberto Augello, Alessandro Motta, Leonardo Giaccari, Robertino Zanoni, Marco De Spirito, Valentina Palmieri, Andrea Giacomo Marrani, Massimiliano Papi
Summary: Graphene oxide and reduced graphene oxide are widely used carbon nanomaterials in biomedicine. However, the hydrophobic behavior of reduced graphene oxide limits its stability in biological media. In this study, sodium ascorbate is used as a reducing agent to prepare reduced graphene oxide with improved stability and suitability for applications in cell culture media.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Francesco Amato, Irene Ferrari, Alessandro Motta, Robertino Zanoni, Enrique A. Dalchiele, Andrea Giacomo Marrani
Summary: This study demonstrates the influence of water on the stability of epoxide functional groups in graphene oxide (GO) under mild annealing. The presence of water triggers the reorganization of epoxide and hydroxyl moieties, leading to the transformation of epoxide groups into vicinal diols. Higher temperature annealing promotes rearrangements and clustering of oxygenated functional groups, resulting in enhanced electron affinity and conductivity of the graphenic network.
