Article
Chemistry, Multidisciplinary
Cesar D. D. Mendoza, F. L. Freire Jr
Summary: We investigated the interfacial electronic structure of single-layer graphene on a germanium substrate using UPS and XPS. The graphene was directly synthesized on (110) undoped Ge substrate via CVD. The study identified the main graphitic properties and showed that the Ge substrate affected the electronic structure of the graphene due to electronic coupling. The study also provided important information on the Schottky contact's nature and energy level alignments for potential integration of single-layer graphene on a Ge substrate with CMOS technology.
Article
Chemistry, Physical
Steffen M. Brulls, Valentina Cantatore, Pui Lam Tam, Per Malmberg, Elisabet Ahlberg, Itai Panas, Siegfried Eigler, Jerker Martensson
Summary: Functionalization and modulation of graphene's electronic properties using organic polycations were investigated. Wet-chemical non-covalent functionalization was performed on chemical vapor deposition graphene and reduced graphene oxide. The number of anions and the properties of the benzimidazole-based systems were found to play a crucial role in determining the redox properties and bonding to graphene. This study provides insights into the cooperative effects of the system's structure and anions on the binding affinity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Lian Liu, Gang Kong, Yanbin Zhu, Delin Lai, Shuanghong Zhang, Chunshan Che
Summary: A new manufacturing method was developed to produce methyltriethoxysilane (MTES)-modified graphene aerogels (MGAs), which possess low density, high porosity, superior elasticity, and high specific surface area. The MGAs can be used as adsorbents for removing organic pollutants and the sorbed pollutants can be recovered through a mechanical absorption-squeezing procedure.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Lian Liu, Gang Kong, Yanbin Zhu, Chunshan Che
Summary: In this study, superhydrophobic graphene aerogel beads with excellent adsorption capacity and recyclability were successfully fabricated using a simple method, showing potential for applications in spill oil and organic pollution cleanup.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Wen Qin, Weihui Zhu, Jing Ma, Yongzhen Yang, Bin Tang
Summary: Supported N-doped reduced graphene oxide aerogel with fiber materials shows ultra-light density, high adsorption capacity, and thermal stability, making it suitable for high-value utilization.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Keishi Akada, Seiji Obata, Koichiro Saiki
Summary: In this study, plasma reduction and nitrogen doping were used to modify graphene oxide (GO), resulting in the removal of various functional groups and the introduction of a large amount of nitrogen content. The plasma treatment showed superior properties compared to thermal reduction, and it has the potential to improve device performance and open up new possibilities for GO applications.
Article
Chemistry, Multidisciplinary
Jungpil Kim, Jang-Woo Han, Yasuhiro Yamada
Summary: The presence of heptagons in graphene nanoflakes influences the XPS profiles, with isolated heptagons shifting peak positions towards higher binding energies and connected heptagons shifting peak positions towards lower binding energies. Additionally, the introduction of heptagons also affects the full width at half-maximum (FWHM) of the XPS profiles, with isolated heptagons leading to a larger increase in FWHM compared to connected heptagons.
Article
Physics, Applied
Eri Hashimoto, Keigo Tamura, Hayato Yamaguchi, Takeshi Watanabe, Fumihiko Matsui, Shinji Koh
Summary: This study characterized CVD-grown graphene on Ir(111)/alpha-Al2O3(0001) using photoelectron momentum microscopy and provided comprehensive insights into the properties of graphene, including its single-crystallinity, number of layers, crystal orientation, and interaction with the substrate, and their correlation with CVD growth conditions.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Sergei A. Baskakov, Yuliya Baskakova, Eugene N. Kabachkov, Victor N. Vasilets, Alexandre Michtchenko, Yury M. Shulga
Summary: The composition and thermophysical properties of the composite aerogel of polytetrafluoroethylene with graphene oxide (PTFE-GO) before and after reduction with hydrazine vapour were investigated using X-ray photoelectron spectroscopy (XPS), thermogravimetry (TG), and differential scanning calorimetry (DSC). The reduction and subsequent heating at 370 degrees C, it was shown, increases the surface fluorine concentration and the thermal stability of the aerogel.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
Chiyan Liu, Jian Liu, Yong Han, Zhangrui Wang, Hui Zhang, Xiaoming Xie, Bo Yang, Zhi Liu
Summary: The hydration process of a Nafion membrane was studied using ambient-pressure x-ray photoelectron spectroscopy (APXPS), which provided a quantitative analysis of water content and the transformation of sulfonic acid groups. The conductivity of the membrane was determined by electrochemical impedance spectroscopy, establishing a connection between the electrical properties and the microscopic mechanism. Ab initio molecular dynamics simulations provided core-level binding energies of O- and S-containing species in the Nafion + H2O system.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Environmental
Bingqian Bi, Yihao Guan, Di Qiao, Xiuping Chen, Mutai Bao, Zhining Wang, Yiming Li
Summary: The frequent occurrence of oil spills has led to serious environmental pollution and ecological issues. In this study, a superhydrophobic aerogel modified with MXene and graphene was developed, which showed efficient photo/electro-thermal conversion and rapid oil sorption capability.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
A. Sankar, S. Valli Chitra, M. Jayashree, M. Parthibavarman, T. Amirthavarshini
Summary: A simple hydrothermal approach was used to fabricate NiO/G nanocomposites, which exhibit hierarchical nanostructures with rich porosity and substantial specific surface area. The nanocomposites show excellent capacitance and cycle performance, making them suitable for high-geared reversible supercapacitors.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Giovanni Chemello, Xenia Knigge, Dmitri Ciornii, Benjamen P. Reed, Andrew J. Pollard, Charles A. Clifford, Tom Howe, Neil Vyas, Vasile-Dan Hodoroaba, Joerg Radnik
Summary: The influence of the morphology of graphene particles on XPS results was studied. It was found that the size of the particles affects the degree of functionalization, and only the combination of XPS and HAXPES allows detection of the functionalization process and provides new insights.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Green & Sustainable Science & Technology
O. A. Tafreshi, S. Ghaffari-Mosanenzadeh, Z. Ben Rejeb, Z. Saadatnia, M. M. Rastegardoost, C. Zhang, C. B. Park, H. E. Naguib
Summary: This study presents the fabrication of new polyimide aerogel composites with graphene nanoplatelet (GNP) incorporation and discusses the role of GNP in tuning various properties of the composites. The results show significant improvements in shrinkage, pore volume, surface area, density, thermal insulation property, and mechanical properties of the composites with GNP incorporation. The study highlights the potential of these materials in thermal insulation applications and oil sorption.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Engineering, Chemical
Melisa Soledad Olivelli, Birgit Schampera, Susanne Karoline Woche, Rosa Maria Torres Sanchez, Gustavo Curutchet, Georg Guggenberger
Summary: The physicochemical properties of enhanced adsorbent materials can be systematically modified by utilizing a combination of clays and fungal biomass. Spectroscopic techniques were employed to investigate the interaction mechanisms between biomass and clay, as well as the changes in surface properties based on synthesis temperature and clay amounts. Results indicated that increased clay amounts reduced particle aggregation and promoted a more uniform arrangement of the biomass. Exchange reactions between Na from the clay and external organic compounds of the biomass were observed. These findings highlight the potential for selective creation of bioclays with specific functional groups or organic matter content on the surface.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Sergey A. Baskakov, Yuliya V. Baskakova, Svetlana S. Krasnikova, Eugene N. Kabachkov, Maria A. Kapustyanskaya, Nadezhda N. Dremova, Filipp O. Milovich, Yury M. Shulga, Xiaowu Wang, Zhi Li
Summary: Polytetrafluoroethylene/cellulose composite aerogels were prepared and the effect of PTFE content on the properties of the aerogels was investigated. Heat treatment of the composite aerogels at high temperatures improved the hydrophobicity of cellulose and enhanced the solvent absorption capacity.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Chemistry, Physical
Sergey A. Baskakov, Yulia V. Baskakova, Elizaveta V. Dvoretskaya, Svetlana S. Krasnikova, Valentina A. Lesnichaya, Yury M. Shulga, Gennady L. Gutsev
Summary: Nanocomposites based on waterborne polyurethane (WPU) and graphene oxide (GO) were synthesized and characterized. The incorporation of GO led to a significant increase in the Young's modulus of WPU films. The mechanical properties of WPU/GO composites were found to be influenced by the lateral size of GO sheets. Additionally, the water absorption of WPU was affected differently depending on the size of GO sheets.
Article
Chemistry, Multidisciplinary
Sergey A. Baskakov, Yulia V. Baskakova, Eugene N. Kabachkov, Elizaveta V. Dvoretskaya, Svetlana S. Krasnikova, Vitaly I. Korepanov, Alexandre Michtchenko, Yury M. Shulga
Summary: Thermally stable films were successfully obtained by adding small amounts of graphene oxide (GO) to a water-based polyurethane (PU) dispersion. The films were characterized using elemental analysis, X-ray photoelectron spectroscopy, differential thermogravimetry, and Raman spectroscopy. It was observed that the introduction of GO into a PU matrix led to partial reduction in graphene oxide nanosheet and an increase in defects concentration in the GO structure. The [C/N] ratio in the near-surface layer of PU/GO composite films was found to increase with the increase in graphene oxide content.
Article
Polymer Science
Sveta Zhiraslanovna Ozkan, Lyudmila Ivanovna Tkachenko, Oleg Nikolaevich Efimov, Galina Petrovna Karpacheva, Galina Vasilevna Nikolaeva, Aleksandr Ivanovich Kostev, Nadejda Nikolaevna Dremova, Evgeny Nikolaevich Kabachkov
Summary: The electrochemical behavior of new electrode materials based on poly-N-phenylanthranilic acid (P-N-PAA) composites with reduced graphene oxide (RGO) was studied for the first time. Two methods of obtaining RGO/P-N-PAA composites were suggested. The specific electrochemical capacitances of the hybrid electrodes reached different values depending on the method of coating production, and the specific weight capacitance of the IR-heated composite coatings decreased compared to the primer coatings.
Article
Materials Science, Multidisciplinary
Mikhail A. Kuzovnikov, Vladimir E. Antonov, Valery I. Kulakov, Vitaly D. Muzalevsky, Nikita S. Orlov, Andrey Palnichenko, Yury M. Shulga
Summary: Zirconium trihydride and trideuteride with hexagonal close-packed metal lattices were synthesized, and their thermal decomposition and superconductivity properties were studied. The results showed that the samples decomposed into tetragonal epsilon-ZrH2/epsilon-ZrD2 at temperatures near 200 K and exhibited superconductivity at temperatures of 11.6(1) K and 9.5(2) K, respectively.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Polymer Science
Linlin Xie, Xiaoxu Wu, Guichao Wang, Yury M. Shulga, Qiong Liu, Ming Li, Zhi Li
Summary: To address the leakage issue of paraffin phase-change materials, a monolithic MTMS-based silica aerogel is used to encapsulate paraffin via impregnation. The resulting paraffin/MSA composites have a density of 0.70 g/cm(3), good mechanical properties, and hydrophobicity (contact angle of 122 degrees). The composites also have a high latent heat of 209.3 J/g and a thermal conductivity similar to that of pure paraffin, making them suitable for thermal management and energy storage applications.
Article
Materials Science, Composites
Sergey A. A. Baskakov, Yulia V. V. Baskakova, Eugene N. N. Kabachkov, Elizaveta V. V. Dvoretskaya, Victor N. N. Vasilets, Zhi Li, Yury M. M. Shulga
Summary: The composite of paraffin with reduced graphene oxide (paraffin/rGO) was obtained by mechanical mixing and ultrasonic dispersion at 70℃. The introduction of only 0.3 wt.% rGO stained the paraffin black. Thermal batteries made from 160 grams of pure paraffin and 160 grams of the composite exhibited equal charging speed when placed in boiling water. However, two minutes of microwave heating resulted in a temperature increase to only 32℃ for the pure paraffin battery, while the paraffin/rGO composite battery reached a temperature of 74℃, above the paraffin solid-liquid phase transition temperature.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Nikita Mitiushev, Eugene Kabachkov, Kirill Laptinskiy, Anatoly Firsov, Gennady Panin, Andrei Baranov
Summary: This study demonstrates the possibility of chemically modifying a graphene oxide film deposited on a Si/SiO2 substrate during a one-stage hydrothermal process by using fluorine ions and reducing agents. The modified graphene oxide film, known as reduced fluorinated graphene nitride oxide (RGOFN), can be obtained in the form of a thin film with a controlled composition of functional groups by adjusting the type and concentration of the reducing agent. XPS and IR spectroscopy analysis reveals controlled changes in the structure and composition of the graphene oxide film, including the removal of oxygen groups, incorporation of fluorine ions, reduction of conjugated double bonds, and controlled incorporation of nitrogen.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
Zhi Li, Kai Shen, Min Hu, Yury M. Shulga, Zhenkui Chen, Qiong Liu, Ming Li, Xiaoxu Wu
Summary: By tailoring the heat treatment, we prepared heat-treated aramid pulp/silica aerogel composites with low density and thermal conductivity, improving thermal stability and insulation. The composites exhibited potential for various thermal insulation applications.
Article
Chemistry, Physical
Alexey Yu. Rychagov, Valentin E. Sosenkin, Marianna Yu. Izmailova, Evgeny N. Kabachkov, Yury M. Shulga, Yury M. Volfkovich, Gennady L. Gutsev
Summary: This study investigated the self-discharge behavior of an electric double-layer capacitor with composite activated carbon electrodes and aqueous electrolyte. It was found that under long-term potentiostatic charge, the discharge capacity decreased when the voltage exceeded 0.8V. The self-discharge process consisted of initial and main phases, and the optimal stabilization time was determined to be 50 minutes at 1.4V.
Article
Materials Science, Multidisciplinary
V. E. Pukha, A. A. Glukhov, A. A. Belmesov, E. N. Kabachkov, I. I. Khodos, M. Khadem, D. -E. Kim, P. A. Karaseov
Summary: The paper presents a study on carbon coatings deposited by accelerated C-60 ion beam irradiation onto a titanium alloy surface, focusing on their potential application in fuel-cell bipolar plates. The study identifies the temperature range and accelerating voltage required for forming a conductive carbon nanocomposite coating. The obtained coating shows promising characteristics, including low interface contact resistance, high wear resistance, and high adhesion to the titanium substrate.
