Article
Chemistry, Analytical
Qingwen Wu, Wenfeng Shen, Dawu Lv, Weigang Chen, Weijie Song, Ruiqin Tan
Summary: The resistive-type PANI sensing film with graphene additives on a flexible PVDF substrate shows promising performance for NH3 detection, with high response and fast response time. The sensor exhibits excellent flexibility and stability, maintaining consistent response values even after multiple bending cycles. The linear relationship between NH3 response values and working temperatures suggests potential for portable sub-ppm level NH3 detection devices.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Electrical & Electronic
Dawu Lv, Wenfeng Shen, Weigang Chen, Yuheng Wang, Ruiqin Tan, Meng Zhao, Weijie Song
Summary: A citric acid-doped polyaniline/polyvinylidene fluoride (CPP) flexible ammonia sensor was prepared by in situ oxidative chemical polymerization on a flexible porous polyvinylidene fluoride membrane. The CPP sensor showed excellent performance with high response, low detection limit, and fast response and recovery times. It also demonstrated outstanding flexibility and stability. The results suggest that the CPP flexible film sensor is a high-performance candidate for enhanced ammonia gas sensing properties at room temperature.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Analytical
Dawu Lv, Wenfeng Shen, Weigang Chen, Ruiqin Tan, Lei Xu, Weijie Song
Summary: An improved ammonia sensor based on PANI and PSS was proposed, showing significantly enhanced response and stability for detecting NH3, making it suitable for large-scale commercial production and potential applications in smart wearable devices.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Tingting He, Wei Liu, Tan Lv, Mingsheng Ma, Zhifu Liu, Alexey Vasiliev, Xiaogan Li
Summary: The 2D MXene/SnO2 heterojunction-based chemiresistive sensor shows excellent sensitivity and selectivity to NH3, with the sensing properties attributed to MXene's unique adsorption ability and conductivity, and the Fermi level difference between MXene and SnO2 driving charge transfer to enhance sensitivity. Additionally, a wireless sensor utilizing low-temperature cofired ceramic technique demonstrates fast response/recovery speeds and stable response to ammonia concentrations, showing promising practical application potential.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Nan Zhang, Bin Jiang, Shanshan Xue, Xiaolong Wang, Tianshuang Wang, Peng Sun, Geyu Lu
Summary: In this study, a novel analysis method based on variation of energy loss was proposed for the first time, and a microwave gas sensor for NH3 detection was successfully developed. The sensor showed a low detection limit, excellent selectivity, humidity-resistance, and good linearity for NH3 concentration.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Thermodynamics
Pin-Yan Lee, Lu-Yin Lin
Summary: In this study, bimetallic ZIF-67-derived fluoride was successfully synthesized for supercapacitors and electrocatalytic water splitting. Through optimization, the highest capacitance and electrical conductivity, as well as excellent energy storage and catalytic performance, were achieved.
Article
Polymer Science
Kunpeng Ruan, Junwei Gu
Summary: In this study, liquid crystalline modification was performed on graphene fluoride (LC-GeF) to achieve ordered alignment, and a thermally conductive liquid crystalline polyimide (LC-PI) matrix was utilized to fabricate thermally conductive LC-GeF/LC-PI composite films. These films exhibited significantly improved thermal conductivity, insulation, mechanical, and thermal properties compared to normal PI films and LC-PI films.
Article
Chemistry, Organic
Hyun Su Kim, Eunbin Jang, Hoe In Kim, Madala Hari Babu, Jae-Young Lee, Sang Kyum Kim, Jaehoon Sim
Summary: A novel persulfate-mediated oxidative glycosylation system using p-methoxyphenyl (PMP) glycosides as stable glycosyl donors is developed. Both K2S2O8 and Hf(OTf)4 are found to be crucial in activating the PMP group as a potential leaving group. This convenient protocol enables the synthesis of various biologically and synthetically important glycoconjugates, including glycosyl fluorides.
Article
Green & Sustainable Science & Technology
Ning Yan, Kang Zhou, Yen Wah Tong, David Tai Leong, Maxim Park Dickieson
Summary: Traditional farming is facing challenges in meeting the needs of a growing population while preserving the environment. A green chemical farming concept, leveraging chemistry and chemical engineering, offers a pathway to efficient and renewable food production.
NATURE SUSTAINABILITY
(2022)
Article
Engineering, Electrical & Electronic
Thye Foo Choo, Kuan Ying Kok, Nur Ubaidah Saidin, Nurazila Mat Zali
Summary: In this study, the humidity sensitivity of graphite pencil marks on paper as sensing material was demonstrated, with ethanol treatment improving the sensitivity. Sensors with different resistances were tested, showing that ethanol-treated sensors had better sensitivity proportional to their resistance. Comparison with other carbon materials like carbon quantum dots film, carbon nanoparticles, carbon nanotubes, graphene oxide and graphene was also conducted for evaluation.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Multidisciplinary
Mohsen Salimi, Fereidoon Rahmani, Seyed Mohammad R. M. Hosseini
Summary: Point-of-care monitoring of breath ammonia for non-invasive CKD diagnosis using a CuF2-doped PPy gas sensor has demonstrated high sensitivity and low detection limits. The sensor exhibited a strong response to 2 ppm NH3, with a detection limit decreased to 0.02 ppm after CuF2 doping. Additionally, the sensor displayed sustained, selective, and stable sensing response to ammonia, even in high humidity conditions.
Article
Chemistry, Physical
Xianjue Chen, Marc Dubois, Silvana Radescu, Aditya Rawal, Chuan Zhao
Summary: Fluorinated single-layer diamond (F-diamond), a new form of 2D carbon allotrope, has been synthesized and exfoliated to yield well-dispersed ultrathin sheets composed of stacked layers of F-diamane. Microscopic and spectroscopic analyses confirmed the retention of the F-diamane-like structure in the exfoliated nanosheets, a finding supported by density functional theory (DFT) calculations.
Article
Chemistry, Physical
Sivalingam Muthu Mariappan, Mathan K. Eswaran, Udo Schwingenschlogl, Tharmar Thangeeswari, Elangovan Vinoth, Mohd Shkir, Zafar Said, Balasubramanian Karthikeyan
Summary: The study found that NaBH4 is an effective reducing agent due to favorable charge transfer kinetics by band bending. The combination of experimental and theoretical methods can provide a deeper understanding of the comparative study of different reducing agents.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Applied
Worakrit Saiyasombat, Utt Eiamprasert, Teera Chantarojsiri, Kittipong Chainok, Supavadee Kiatisevi
Summary: A novel bis-BODIPY-based sensor, BODIPY-NN, has been reported for selective and sensitive recognition of F- and CN- ions. The sensor undergoes a marked color change and fluorescence quenching exclusively in the presence of F- and CN- ions. The mechanism of anion binding to BODIPY-NN has been elucidated through NMR, mass spectra, and theoretical calculations. The sensor can be regenerated by adding water in the F- system, while CN- ions irreversibly disrupt the sensor.
Article
Chemistry, Analytical
Edilene A. da Silva, Cedric Samuel, Leonardo N. Furini, Carlos Jose L. Constantino, Nathalie Redon, Caroline Duc
Summary: In this study, highly sensitive ammonia sensors based on acidic-doped polyaniline and polyurethane were proposed. The influence of polyurethane on the film structure and sensing performances of polyaniline was investigated by varying the mass ratios between the polymers. The results showed that the presence of polyurethane significantly enhanced the sensitivity of the sensors without interfering with the main sensing features of polyaniline. Furthermore, polyurethane mitigated the influence of humidity on the sensors and decreased the drift of the devices, increasing their lifespan.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Nanoscience & Nanotechnology
Nadzeya Valynets, Alesia G. Paddubskaya, Vitalii Sysoev, Dmitriy Gorodetskiy, Lyubov G. Bulusheva, Alexander Okotrub
Summary: We propose a novel laser treatment technique for fabricating grating metasurfaces using fluorinated graphene (FG) films, which significantly enhances their terahertz transmission properties. The treatment transforms the insulating FG into conductive material, resulting in a DC conductivity of 170 S·m(-1) in the treated areas. The resonance transmittance of the metasurfaces, studied using THz time-domain spectroscopy in the 100 GHz-1 THz frequency range, shows enhancement and tunability by changing the metasurface geometry. The fabricated metasurfaces also demonstrate efficient narrowband polarization rotation of 50 degrees.
Article
Chemistry, Physical
Nikolay A. Belov, Aleksandr Y. Alentiev, Dmitrii S. Pashkevich, Fedor A. Voroshilov, Edgar S. Dvilis, Igor P. Asanov, Roman Y. Nikiforov, Sergey V. Chirkov, Daria A. Syrtsova, Julia V. Kostina, Yulia G. Bogdanova
Summary: Poly(vinyl trimethylsilane) (PVTMS) films were fluorinated directly in a liquid medium (perfluorodecalin). Various techniques were used to investigate the changes, including SEM-XEDS, XPS, ATR-IR, and contact angle measurement. The results showed that fluorination primarily affected the Si(CH3)3 groups, with monofluorinated, difluorinated, and trifluorinated groups appearing at different stages. The depth of fluorination was estimated to be <= 1.1 μm, and surface oxidation and hydrophobicity were observed during the fluorination process.
Article
Chemistry, Multidisciplinary
Anna A. Vorfolomeeva, Svetlana G. Stolyarova, Igor P. Asanov, Elena V. Shlyakhova, Pavel E. Plyusnin, Evgeny A. Maksimovskiy, Evgeny Yu. Gerasimov, Andrey L. Chuvilin, Alexander V. Okotrub, Lyubov G. Bulusheva
Summary: This study compares the electrochemical performance of commercial single-walled carbon nanotubes (SWCNTs) with red phosphorus deposited on the outer surface and/or encapsulated in internal channels for lithium-ion batteries. Encapsulated phosphorus demonstrates higher reaction rates and slight loss of initial capacity compared to external phosphorus. The support of SWCNTs and tubular space contribute to the stable operation and formation of chain phosphorus structures.
Article
Chemistry, Multidisciplinary
Alina D. Nishchakova, Dmitri A. Bulushev, Svetlana V. Trubina, Olga A. Stonkus, Yury V. Shubin, Igor P. Asanov, Vladimir V. Kriventsov, Alexander V. Okotrub, Lyubov G. Bulusheva
Summary: Ni supported on N-doped carbon was studied for its application in traditional catalytic reactions. The structure of 1% and 6% Ni catalysts on N-free and N-doped carbon supports were compared, along with their efficiency in hydrogen generation from gaseous formic acid. It was found that N-doped carbon supported stable Ni single-atoms and sub-nanosized Ni clusters. The results showed that both Ni single-atoms and clusters had similar reaction rates, and the 6% Ni catalyst on N-doped carbon exhibited higher selectivity and comparable activity in hydrogen production.
Article
Electrochemistry
Yuliya V. Fedoseeva, Elena V. Shlyakhova, Anna A. Vorfolomeeva, Mariya A. Grebenkina, Vitalii I. Sysoev, Svetlana G. Stolyarova, Evgeny A. Maksimovskiy, Anna A. Makarova, Alexander V. Okotrub, Lyubov G. Bulusheva
Summary: In this work, mesopore-enriched nitrogen-doped carbon (NC) materials were synthesized using template-assisted chemical vapor deposition. The best electrochemical performance was observed in the NC-650 sample, which delivered a discharge capacity of 182 mA center dot h center dot g(-1) in sodium-ion batteries and 1158 mA center dot h center dot g(-1) in lithium-ion batteries at a current density of 0.05 A center dot g(-1). The study reveals the important role of defect sites in the binding and accumulation of sodium, providing a strategy for optimizing the carbon structure and nitrogen states to enhance the alkali-metal-ion storage capacity and cycling stability of NC materials.
Article
Chemistry, Physical
Vyacheslav A. Bardin, Yuri A. Vorotnikov, Igor P. Asanov, Natalya A. Vorotnikova, Michael A. Shestopalov
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
E. S. Kobeleva, M. N. Uvarov, N. V. Kravets, S. A. Ponomarev, O. A. Gurova, A. V. Okotrub, M. S. Kazantzev, K. M. Degtyarenko, L. V. Kulik
Summary: Highly dispersed fluorinated SWCNTs of submicron length were used as nonvolatile additives in polymer/fullerene organic solar cells, resulting in reproducible improvements in the main performance parameters of the cells. The improvements are attributed to the geometric optimization of the active layer morphology by fluorinated SWCNTs, rather than modifications in the electronic structure or charge transfer. The absence of large CNT aggregates and metallic SWCNTs was confirmed through atomic force microscopy and optical spectra analysis.
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2023)
Article
Biochemistry & Molecular Biology
Iulia V. Savina, Anton A. Ivanov, Darya V. Evtushok, Yakov M. Gayfulin, Andrey Y. Komarovskikh, Mikhail M. Syrokvashin, Mariia N. Ivanova, Igor P. Asanov, Ilia V. Eltsov, Natalia V. Kuratieva, Yuri V. Mironov, Michael A. Shestopalov
Summary: This study presents the synthesis and characterization of new chalcogenide molybdenum clusters. The oxidized and reduced forms of the clusters have similar geometries and can be reversibly transformed into each other. Comprehensive characterization reveals the different charge states and magnetic properties of molybdenum in the clusters. DFT calculations contribute to the understanding of the chemistry of molybdenum chalcogenide clusters.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Mariya A. Grebenkina, Galina N. Chekhova, Dmitry V. Pinakov, Yury V. Shubin, Igor P. Asanov, Lyubov G. Bulusheva, Alexander Okotrub
Summary: The dielectric properties of fluorinated graphites with different fluorine contents and embedded bromine molecules were studied by impedance spectroscopy. The contributions of the fluorinated graphite matrix and bromine guests to the dielectric permittivity were estimated using the Maxwell-Garnett approximation. The permittivity of the fluorinated graphite matrix increased with decreasing fluorine content and was not temperature-dependent. The change in permittivity upon cooling/heating was caused by the polarization of bromine molecules. The temperature-dependent dielectric response of fluorinated graphite with a fluorine content of 0.60 was attributed to the formation of bromine and polybromide ions in the interlayer space, with a decrease in permittivity at low temperatures due to the freezing of ion mobility.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Alexander Okotrub, Dmitriy Gorodetskiy, Yuri N. Palyanov, Dmitry A. Smirnov, Lyubov G. Bulusheva
Summary: By controlling the transformation process of diamond into graphite at elevated temperatures, sp2/sp3 carbon hybrids can be created. This study examines the effect of a thin iron film coating on the reconstruction of a (100) diamond face. Various spectroscopic and microscopy techniques were used to analyze the electronic and structural changes on the diamond surface. The results show the formation of thin sp2-carbon fragments on the clean diamond surface and ordered graphite planes on the iron-coated surface. Iron catalyzes the transformation of diamond into graphitic layers growing vertically relative to the (100) face.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Alexander V. V. Okotrub, Olga V. V. Sedelnikova, Dmitriy V. V. Gorodetskiy, Anastasiya D. D. Fedorenko, Igor P. P. Asanov, Yury N. N. Palyanov, Alina V. V. Lapega, Olga A. A. Gurova, Lyubov G. G. Bulusheva
Summary: This study investigates the interaction between diamond and metals as well as the interface structure, especially at elevated temperatures. The experiments reveal uniform coating of titanium on the diamond surface and the formation of flattened molybdenum nanoparticles. Titanium is completely oxidized and transforms into a carbide state upon annealing, while molybdenum interacts with the diamond surface, leading to the carbidization of nanoparticles and catalytic graphitization. The conductivity of the resulting sample is improved compared to Ti-coated diamond substrates and Mo-coated (111) substrates annealed at 800 degrees C. These findings are valuable for the development of graphene-on-diamond electronics.
Article
Chemistry, Multidisciplinary
Svetlana V. Belaya, Eugene A. Maksimovsky, Vladimir R. Shayapov, Aleksandra A. Shapovalova, Alexey N. Kolodin, Andrey A. Saraev, Igor P. Asanov, Maxim N. Khomyakov, Irina V. Yushina, Aleksandr G. Plekhanov, Veronica S. Sulyaeva, Marina L. Kosinova
Summary: This study focuses on the chemical vapor deposition of amorphous boron carbonitride films using trimethylamine borane and nitrogen. The films were synthesized using low-pressure chemical vapor deposition (LPCVD) and plasma-enhanced chemical vapor deposition (PECVD) methods, and their properties were systematically studied. The film composition, hydrophilicity, mechanical properties, and optical properties were analyzed.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Vitalii I. I. Sysoev, Olga A. A. Gurova, Yuliya V. V. Fedoseeva, Artem V. V. Gusel'nikov, Anna A. A. Makarova, Alexander V. V. Okotrub, Lyubov G. G. Bulusheva
Summary: The effect of humidity on the electrical conductivity of SWCNT films depends on both the conductivity of individual nanotubes and the electrical contacts between them. Non-functionalized SWCNTs and contacts between them exhibit decreased conductivity upon adsorption of water molecules. Covalent fluorination reduces the conductivity of SWCNTs and increases the sensitivity of the film to low concentrations of water vapor. Nitrogen-containing groups added through substitution reactions improve intertube contacts and increase the surface area for water adsorption. Increasing the number of functional groups on the SWCNT surface enhances the sensor's sensitivity to low water concentrations but worsens the response at high humidity.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
