Article
Chemistry, Physical
Jingjian Zhou, Jing Huang, Huai Chen, Archana Samanta, Jan Linnros, Zhenyu Yang, Ilya Sychugov
Summary: The study presents a cost-effective method for synthesizing Si quantum dots with superior optical properties compared to those from other precursors, which could be beneficial for applications like photovoltaics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Optics
Dongke Li, Jiaming Chen, Teng Sun, Yangyi Zhang, Jun Xu, Wei Li, Kunji Chen
Summary: Phosphorus/boron co-doping in Si quantum dots/SiO2 multilayers enhances subband light emission, with increasing B co-doping ratio resulting in improved emission intensity nearly two orders of magnitude stronger than solely P-doped samples. This enhancement is attributed to B dopants passivating surface dangling bonds, leading to suppressed phosphorus-related deep level emission and appearance of emission centered around 1400 nm in high B co-doping ratios.
Article
Chemistry, Multidisciplinary
Szabolcs Czene, Nikoletta Jegenyes, Olga Krafcsik, Sandor Lenk, Zsolt Czigany, Gabor Bortel, Katalin Kamaras, Janos Rohonczy, David Beke, Adam Gali
Summary: Silicon carbide nanoparticles (SiC NPs) are potential inorganic molecular-sized fluorescent biomarkers, and researchers have developed a method to directly introduce amino groups into aqueous SiC NPs. The applicability of amino-terminated SiC NPs is demonstrated by attaching bovine serum albumin, and it is found that the fluorescence intensity is highly sensitive to surface termination, which may have implications for nanometer-sized SiC NPs with optically read electron spins.
Review
Materials Science, Multidisciplinary
Mitchell O. de Vries, Shin-ichiro Sato, Takeshi Ohshima, Brant C. Gibson, Jean-Marie Bluet, Stefania Castelletto, Brett C. Johnson, Philipp Reineck
Summary: Silicon carbide (SiC) nanoparticles have versatile surface chemistry and fluorescence properties, but have received less attention in scientific research. This review evaluates the fabrication methods, characterization techniques, and fluorescence properties of fluorescent SiC nanoparticles, identifying the main sources of fluorescence and highlighting the potential for scientific discovery. Demonstrated and emerging potential applications of SiC nanoparticles in bioimaging and quantum sensing are also discussed.
ADVANCED OPTICAL MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Samuel Ahoulou, Etienne Perret, Jean-Marie Nedelec
Summary: Silicon nanowires are attractive materials due to their high surface-to-volume ratio and unique electrical properties, which can be further enhanced by adjusting surface properties with organic/inorganic compounds. This review provides an overview of techniques for modifying silicon nanowire surfaces and characterizing them, highlighting the potential advantages in sensing applications and chipless tag RFID technology. Future opportunities for functionalized silicon nanowires in RFID are also discussed.
Article
Chemistry, Physical
Paul Cannon, Brian Freeland, Margaux Jaquiery, Enda McGlynn, Jennifer Gaughran
Summary: This study explores a novel controlled recirculation pulsed laser ablation in liquids (PLAL) scheme to enhance the functionalization and productivity of functionalized nanoparticles. The results show that ablating a silicon target in a DNA solution allows for efficient binding of DNA to silicon nanoparticles (SiNPs) in a single-step process. By using SiNPs instead of traditional gold or silver, the overall cost of the process is significantly reduced, while a biocompatible material with an affinity for protein and nucleic acid binding is utilized.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
Peng Wang, Jacob Fortner, Hongbin Luo, Jacek Kaos, Xiaojian Wu, Haoran Qu, Fu Chen, Yue Li, YuHuang Wang
Summary: Water unexpectedly acts as a nucleophilic agent in the diazonium reaction with carbon nanotubes involving chlorosulfonic acid, providing -OH as the pairing group. Replacing water with other nucleophilic solvents allows the creation of organic color centers (OCCs) with entirely new pairing groups, enabling systematic control over defect pairs and the optical properties of resulting color centers.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Jing Ma, Yusheng Zhou, Haiyang Gao, Fangming Zhu, Guodong Liang
Summary: Photoluminescent materials are widely used in various fields, with a recent study reporting rare full-type photoluminescence from a single organic molecule, showing properties like aggregation-induced phosphorescence and thermoresponsive persistent phosphorescence. The materials can provide multiple visual signals upon temperature variation, and their luminescence thermoresponse is amplified when incorporated into polymers. A facile method based on phosphorescence lifetime and image analysis is used for quick, visual, and quantitative temperature sensing, showing promise for applications in quantitative temperature sensing.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Materials Science, Multidisciplinary
Bruno P. Falcao, Joaquim P. Leitao, Lidia Ricardo, Hugo Aguas, Rodrigo Martins, Rui N. Pereira
Summary: This study clarifies the dominant electron-hole recombination mechanisms and the origin of light emission in Si-NPs with different forms of surface passivation. The research shows that at low excitation powers, recombination of photo-carriers is dominated by monomolecular channels via defect states, while at high excitation powers, electron-hole bimolecular recombination dominates. The sensitivity of H-terminated Si-NPs to photo-oxidation and its consequences for Si-NP applications are discussed, with photo-oxidation described within the Cabrera-Mott chemical reactions theory.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Analytical
Masanori Sakamoto, Ken-ichi Saitow
Summary: Silicon is considered a promising enhancement material due to its abundance, low toxicity, and high refractive index. A cost-effective and efficient fabrication method for a field enhancement substrate consisting of a two-dimensional Si wire array (2D-SiWA) was reported, demonstrating high sensor sensitivity and reproducibility. The large-area Si fluorescence sensor fabrication proved to be 50x less expensive, 20x faster, and 60,000x larger than the typical electron beam lithography method.
ANALYTICAL CHEMISTRY
(2022)
Article
Computer Science, Information Systems
Panting Niu, Shuhui Liu, Wei Cheng, Litong Li
Summary: In this work, the transmission characteristic of a SMF-Capillary-SMF structure is modified by introducing liquids inside and outside the silica capillary. The presence of liquids influences the anti-resonant reflecting guidance mechanism and alters the resonant wavelength and transmission intensity. The temperature sensitivity and intensity at resonant wavelength are dependent on the refractive index of the liquids. This simple and easy-to-fabricate device has wide applications in liquid environments like biochemical and pharmacy industries.
Article
Chemistry, Multidisciplinary
Hang Liu, Xiukai Jian, Mingtai Liu, Kailin Wang, Guangyao Bai, Yuhong Zhang
Summary: SrWO4 phosphors doped with Ho3+(Er3+)/Yb3+ were successfully prepared by a high temperature solid-state reaction method, showing strong green emissions under 980 nm excitation. The upconversion luminescence properties were studied at different temperatures, and the temperature sensing properties were discussed using fluorescence intensity ratio technology. The results demonstrate that these phosphors are robust for optical temperature sensors, achieving maximum absolute sensitivity of 0.0158 K-1 and 0.013 K-1 for different dopants.
Article
Polymer Science
Hongtao Dang, Yan Zhang, Yukun Qiao, Jin Li
Summary: This paper investigates the optical and sensing properties of microfibers modified by silicon nanoparticles (NPs) and silver NPs. The refractive index sensitivities of the microfiber tapers fabricated with silver NPs and silicon NPs were experimentally demonstrated. Additionally, a miniature temperature probe using the proposed microfiber was developed with high sensitivity.
Article
Chemistry, Physical
Zenghui Sima, Peng Song, Qi Wang
Summary: The ZnSnO3 hollow cubes were successfully modified by Ag nanoparticles, which generated Schottky barrier-type junctions and enhanced the sensing performance. The gas-sensing results showed excellent response value (26.7) towards 50 ppm formaldehyde at 100 degrees C, as well as fast response/recovery time (12/18 s), remarkable reproducibility, and outstanding stability. The sensing mechanism was proposed based on the structure of ZnSnO3 hollow cubes and the catalytic activity of Ag NPs. This work confirms that Ag NPs modification is an efficient strategy to improve the sensing properties of ZnSnO3-based gas sensors.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Analytical
Siqian Cui, Bowei Wang, Yi Teng, Ziyu Wan, Yuxuan Zan, Ligong Chen, Yang Li, Xilong Yan
Summary: A novel multiple stimuli-responsive fluorophore TPI was designed and synthesized for quantitative determination of trace water in organic solvents, recognition of acid vapors, and as a potential candidate for efficient turn on type luminescence thermometers. Its ability to capture and recognize acid vapors, especially SO2, with high sensitivity and quantitatively was demonstrated. This study showcased the rapid, simple, and visual quantitative sensing of polarity, temperature, and acid vapors, particularly SO2, by a single component fluorescent molecule.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Mechanical
David Philippon, Laetitia Martinie, Philippe Vergne
Summary: Liu et al. conducted a study on friction in heavily loaded lubricated contacts, comparing measurements obtained from tests carried out under different conditions. They identified three alternative effects that explain the results: different elastohydrodynamic conditions, significant thermal effects, and mixed lubrication regimes. The study aims to provide insights into understanding the mechanisms behind friction in highly loaded EHD contacts by proposing recommendations for conducting friction tests.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
V. M. Pyeshkova, O. Y. Dudchenko, O. O. Soldatkin, S. A. Alekseev, T. Seker, B. Akata Kurc, S. V. Dzyadevych
Summary: A new three-enzyme lactose amperometric biosensor was developed based on a platinum disc electrode modified by a nanosized semipermeable poly (meta-phenylenediamine) film. The optimized electropolymerization conditions of meta-phenylenediamine resulted in a high sensitivity and selectivity of the biosensor for lactose measurement. The biosensor showed high reproducibility, sensitivity, and selectivity, making it suitable for rapid and accurate determination of lactose in milk samples.
APPLIED NANOSCIENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Sergey P. Chenakin, Sergei A. Alekseev, Norbert Kruse
Summary: XPS and DRIFTS were utilized to investigate the isothermal decomposition of MnC2O4, revealing two pathways for decomposition leading to the formation of MnO and MnCO3. Graphitic carbon formation was observed in the reaction products, associated with interface chemical reactivities between MnO particles and the supporting gold foil.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Mechanical
Alberto Porras-Vazquez, David Philippon, Nicolas Fillot, Philippe Vergne, Nicolas Devaux, Lionel Lafarge, Guillermo E. Morales-Espejel
Summary: This study evaluates the effects of lubricant starvation on the film thickness of spinning large-size point contacts from an experimental standpoint. A dedicated experimental setup is introduced and validated, and novel experimental measurements are presented to corroborate earlier numerical trends and describe the behavior of such contacts from a kinematic perspective.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Materials Science, Coatings & Films
Aslihan Sayilan, Nicolas Mary, David Philippon, Philippe Steyer, Sylvie Descartes
Summary: This paper presents a custom-built mini-tribometer designed for an environmental SEM, which allows for controlled atmosphere testing. The effectiveness of the tribometer is validated through experiments conducted in two different environments, and scenarios of materials degradation are suggested based on the nature of the interface involved in the contact.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Mechanical
F. Zhang, N. Fillot, N. Bouscharain, N. Devaux, D. Philippon, C. Matta, G. E. Morales-Espejel
Summary: This study investigates water-in-oil flow at the entrance of EHD contacts using experimental and numerical approaches. High-speed camera observations reveal the presence of micro-sized water-in-oil emulsion flow at the entrance of an EHL point contact. The study also examines the effects of various operating parameters on the flow of water-in-oil emulsion.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Yujiao Zhou, Gilles Ledoux, David Philippon, Sylvie Descartes, Matteo Martini, Shaozhou He, Cedric Desroches, Didier Fournier, Catherine Journet, Laurence Bois
Summary: Photoluminescent temperature sensors based on gadolinium orthovanadate (GdVO4) doped with ytterbium and erbium were developed and dispersed in different media for temperature measurement. The luminescence intensity ratio of thermally coupled erbium emission peaks varies linearly with temperature and can be corrected for laser-induced thermal effects.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Kateryna I. I. Hnatiuk, Yuri F. F. Zabashta, Maxim M. M. Lazarenko, Sergei A. A. Alekseev, Kateryna S. S. Yablochkova, Michael V. V. Ushcats, Roman V. V. Dinzhos, Liena Yu. Vergun, Dmytro A. A. Andrusenko, Aleksander N. N. Alekseev, Leonid A. A. Bulavin
Summary: This study investigates the scale effect of dielectric relaxation in nanocrystals, specifically how the relaxation parameters depend on the size of the nanocrystal. A model is proposed to explain the scale effect caused by thermally activated motion, considering each nanocrystal as a physical infinitesimal volume where local equilibrium exists. It is concluded that energy fluctuations in the nanocrystal as a whole are caused by thermally activated motion, and the intensity of these fluctuations decreases with decreasing nanocrystal sizes. Experimental data using complex dielectric permittivity of composites support the predictions of the model.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Mechanical
Georges Amine, Nicolas Fillot, David Philippon, Nicolas Devaux, Johnny Dufils, Etienne Macron
Summary: This study presents a dual experimental-numerical approach to investigate oil film thickness and friction in a wide elliptical TEHL contact under different sliding conditions. The experimental results show different trends of film thickness variation for different slide-to-roll ratios. The numerical model accurately predicts film thickness and friction behavior under a wide range of sliding conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Chemical
Ruibin Xu, Laetitia Martinie, Philippe Vergne, Laurent Joly, Nicolas Fillot
Summary: Lubricated friction is influenced by contact operating conditions and rheological characteristics of the lubricants. The presence of a friction plateau in extreme contact conditions, where friction is independent of sliding speed, remains unexplained. This study presents a novel approach for predicting EHD friction using a combination of a viscosity model and a thermal-elastohydrodynamic contact model.
Article
Engineering, Mechanical
David Philippon, Soha Baydoun, Siegfried Fouvry
Summary: The fretting behavior of AISI 52100 steel and low alloy steel under grease lubricated conditions is studied. The friction behavior exhibits a high friction regime for small displacement amplitudes and a low friction regime for larger sliding amplitudes with a lubricating tribofilm generated. A simplified fretting methodology is introduced to quantify the influence of contact parameters, such as surface roughness and contact size. It is found that surface roughness affects the stability and performance of the lubricating tribofilm, and different contact size regimes are identified.
Article
Chemistry, Multidisciplinary
Antonin Lavigne, Thomas Gehin, Benoit Gilquin, Vincent Jousseaume, Marc Veillerot, Claude Botella, Celine Chevalier, Cecile Jamois, Yann Chevolot, Magali Phaner-Goutorbe, Christelle Yeromonahos
Summary: This study demonstrates that using chemically functionalized nanoporous silicon surfaces can address the limitations of MALDI-ToF MS analysis. The physicochemical properties of metabolites and surfaces play a significant role in MS analysis. Porous substrates are more suitable for hydrophobic metabolites, while plane substrates are better for hydrophilic metabolites.
Article
Chemistry, Physical
Yujiao Zhou, Gilles Ledoux, Laurence Bois, Sylvie Descartes, Nathalie Bouscharain, Fernand Chassagneux, Matteo Martini, Yamaldi Midiladji Bakary, Catherine Journet, David Philippon
Summary: Non-contact temperature measurement at the nanoscale by photoluminescence using a nano-sensor in a confined fluid has been achieved in this study. Upconversion lanthanide-doped nanoparticles were utilized as a self-referenced nanosensor for ratiometric thermometry. The synthesized Gadolinium orthovanadate (GdVO4) nanoparticles doped with Yb3+ and Er3+ were dispersed in an ester-based fluid. The results showed that the dispersed NP suspension allowed luminescence intensity ratio (LIR) thermometry up to 473 K with a relative sensitivity of 1.17% K-1 using a NIR laser.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Sergey P. Chenakin, Sergei A. Alekseev, Norbert Kruse
Summary: XPS and DRIFTS were used to study the isothermal decomposition of MnC2O4 under different environmental conditions, revealing its decomposition kinetics and the composition of the final products. This helps to better understand the thermal decomposition mechanism of this compound.
INORGANIC CHEMISTRY
(2022)
