Article
Multidisciplinary Sciences
Yuri N. Palyanov, Yuri M. Borzdov, Igor N. Kupriyanov, Alexander F. Khohkhryakov, Denis V. Nechaev
Summary: The study reports the synthesis of diamonds with rare properties using melts of rare-earth metals as catalysts, determining the conditions for diamond crystallization and optimal parameters for the synthesis of single crystal diamonds. The rare-earth metal catalysts not only result in nitrogen-free diamonds, but also enable the synthesis of diamonds doped with group IV elements, promising for emerging quantum technologies. This study demonstrates a new field of application for rare-earth metals.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Jeremy Guignard, Mythili Prakasam, Alain Largeteau
Summary: There are various methods to synthesize diamonds industrially, with the high-pressure-high-temperature (HP-HT) process being the most commonly used. Traditional diamond compacts contain binder, limiting their properties and applications, while binderless diamond compacts have superior properties and a large market potential. However, the sintering conditions for binderless diamonds still need to be optimized for industrial transfer.
Article
Chemistry, Physical
Lili Zhao, Bin Chang, Tianjiao Dong, Haifeng Yuan, Yue Li, Zhenfei Tang, Zhen Liu, Hong Liu, Xiaoli Zhang, Weijia Zhou
Summary: Uniform and strongly adhered CoSx nanospheres on carbon fiber cloths (CoSx/CC-L) were synthesized through laser synthesis method. The amorphous CoSx containing numerous S vacancies showed enhanced catalytic performance for hydrogen evolution reaction (HER) and nitrogen reduction reaction (NRR).
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
Georgia Kastrinaki, Souzana Lorentzou, Athanasios G. Konstandopoulos
Summary: In this study, uniformly porous and solid core porous particles were synthesized by aerosol spray pyrolysis route using a one-step process, which is of high interest for pharmaceutical and catalytic applications. The effect of synthesis parameters on the core size, surface area, and porosity of the core-shell structures was validated through morphological evaluation and nitrogen adsorption and desorption isotherms. Different surfactants (Brij-58, CTAB, P123) at various concentrations and combinations, as well as different core type compositions (NaCl, CeO2, and Ce0.8Zr0.2O2), were evaluated for the controlled synthesis of silica core-shell particles using a scalable synthesis method.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Multidisciplinary Sciences
Lalita Buengkitcharoen, Sittipong Amnuaypanich, Suriyabhorn Naknonhan, Sirinuch Loiha, Nopbhasinthu Patdhanagul, Ammarika Makdee, Sujitra Amnuaypanich
Summary: Metallic Ag nanoparticles were prepared on ZnO photocatalysts through sol-gel autocombustion and ion-impregnation. The presence of impregnated Ag as nanoparticles on ZnO surfaces affected the microstructure of ZnO particles. The Ag/ZnO composites showed higher photocatalytic activity for sucrose degradation under UV light compared to pure ZnO, attributed to the suppression of surface defects and electron-hole recombination.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Rongjuan Liu, Zhenyu Feng, Caikun Cheng, Hui Li, Jiaming Liu, Jingjing Wei, Zhijie Yang
Summary: The cooperativity between achiral CdSe/CdS nanorods (NRs) and chiral perylene diimide (PDI)-based molecules is built upon their coassembly. The encapsulation of NRs into PDI suprascrolls enables chirality transfer and leads to enhanced circularly polarized luminescence. The chirality of the nanocomposites can be inverted when NRs are self-assembled into chiral superlattices.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Xin-Yuan Miao, Hong-An Ma, Zhuang-Fei Zhang, Liang-Chao Chen, Li-Juan Zhou, Min-Si Li, Xiao-Peng Jia
Summary: In this study, boron-doped and boron/nitrogen co-doped large single-crystal diamonds were synthesized and investigated under high pressure and high temperature conditions. The incorporation of nitrogen changed the growth trace on the surface of boron-containing diamonds significantly. Different properties were observed between boron-doped and boron/nitrogen co-doped diamonds, with nitrogen incorporation significantly decreasing the boron acceptor concentration in diamonds.
Article
Chemistry, Multidisciplinary
Sheng Zhang, Junheng Gao, Fu Tang, Jie Wang, Chuang Yao, Lidong Li
Summary: A seedless wet method for the synthesis of copper twinned nanostructures has been proposed in this study, which successfully synthesized large copper decahedrons and singly twinned copper right bipyramids. Different kinds of copper twinned nanostructures could be obtained by adjusting the amount of chloride ions and oleylamine.
Article
Engineering, Electrical & Electronic
Souha Aouini, Afrah Bardaoui, Diogo M. F. Santos, Radhouane Chtourou
Summary: CuMn2O4 with spinel structure was successfully synthesized on a stainless steel mesh by a one-pot hydrothermal method, showing excellent electrochemical performance as a supercapacitor electrode.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Letter
Chemistry, Physical
Xudong Li, Peixian Chen, Yong Xia, Ji Weng, Meijuan Chen, Tingchao He, Yiwen Li, Jiaji Cheng, Lei Zhang
Summary: This article presents a hydrothermal-assisted synthesis method for chiral polyhedral tellurium nanoparticles, which can change the chiral morphology of tellurium nanoparticles by controlling parameters such as hydrothermal reaction time, amount of polyvinylpyrrolidone, and species of chiral molecules.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xudong Li, Peixian Chen, Yong Xia, Ji Weng, Meijuan Chen, Tingchao He, Yiwen Li, Jiaji Cheng, Lei Zhang
Summary: This study presents the hydrothermal-assisted synthesis of chiral polyhedral tellurium nanoparticles, which show different chirogenesis compared to particles fabricated by wet chemistry. The morphology of the nanoparticles changes from fundamental two-dimensional shapes to chiral three-dimensional polyhedra due to the screw dislocation effects observed during nanoparticle growth. The growth of chiral polyhedral tellurium nanoparticles is affected by hydrothermal reaction time, amount of polyvinylpyrrolidone, and species of chiral molecules.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Federico Gorrini, Carla Dorigoni, Domingo Olivares-Postigo, Rakshyakar Giri, Pietro Apra, Federico Picollo, Angelo Bifone
Summary: The effects of green laser irradiation on shallow NV centers in diamond surfaces were studied, showing that high laser power promotes the photoconversion of NV0 to NV-. The excess NV- population is stable over a timescale of 100 ms after switching off the laser, leading to long-lived enrichment of shallow NV-.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Buzuayehu Abebe, Bontu Kefale, Dereje Tsegaye Leku
Summary: The charge transfer and visible-light absorption capacities of stable materials are crucial in various applications. Copper-silver-zinc oxide nanocomposites (NCs) were synthesized using PVA and urea. The NCs showed better visible light absorption and charge transfer properties compared to single ZnO NPs. The NCs also demonstrated potential in an organic catalytic reduction reaction.
Article
Chemistry, Multidisciplinary
Didi Prasetyo Benu, Amelia Andriani, Nadiatus Silmi, Fry Voni Steky, Fainan Failamani, Brian Yuliarto, Rino Rakhmata Mukti, Veinardi Suendo
Summary: In this study, fibrous ZnO microrods were synthesized using a macroemulsion-mediated solvothermal method. The results showed that ZnO synthesized from two different precursors had similar crystal structures but different fibrous morphologies. ZnO synthesized from zinc acetate exhibited a more uniform fibrous morphology and showed better photocatalytic performance.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Ha M. Nguyet, Le T. T. Tam, Doan T. Tung, Nguyen T. Yen, Hoang T. Dung, Ngo T. Dung, Hong N. Phan, Le A. Tuan, Phan N. Minh, Le T. Lu
Summary: This paper reported an easy synthesis of MnCo2S4 (MCS) nanosheets and their application as electrode material for supercapacitors. The MCS nanosheets exhibited high specific capacity and excellent cycling stability, and the symmetric supercapacitor fabricated with MCS nanosheets showed outstanding energy density and power density.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
O. P. Chernogorova, E. A. Ekimov, E. I. Drozdova, I. N. Lukina, D. A. Prokopenko
Summary: Composite materials based on Co, Ti-Cu, and Pt reinforced with diamond-like carbon particles and diamonds were synthesized under high-pressure high-temperature conditions. Various tests were conducted to investigate the correlation between the structure and properties of the reinforcing phase and the composite materials. It was found that the diamond-reinforced composites exhibited low friction coefficients and high wear resistance.
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
E. A. Ekimov, M. Kondrin, S. G. Lyapin, Yu B. Lebed', P. Enkovich, R. A. Khmel'nitskii
Summary: Diamond has been successfully synthesized in the graphite-Sn and graphite-Pb systems at high pressures and temperatures. The presence of compressed Sn and Pb inclusions in the prepared diamonds suggests a catalytic role of Sn and Pb in diamond formation. This study demonstrates the feasibility of diamond synthesis from graphite in the presence of Pb for the first time.
INORGANIC MATERIALS
(2021)
Article
Optics
A. A. Razgulov, S. G. Lyapin, A. P. Novikov, E. A. Ekimov
Summary: The temperature and pressure effects on the photoluminescence of GeV center ensembles in high-quality HPHT microcrystalline diamond were studied, revealing the contribution of lattice thermal expansion and electron-phonon coupling. The temperature dependence of the width of the zero-phonon line (ZPL) follows a power law, while the electron-phonon coupling contributes to the ZPL temperature shift following a polynomial law. Additionally, the temperature effect on the quasi-local vibrational mode was investigated for the first time, demonstrating a decrease in energy with increasing temperature possibly due to anharmonicity effect.
JOURNAL OF LUMINESCENCE
(2022)
Article
Physics, Applied
V. S. Krivobok, A. D. Kondorskiy, D. A. Pashkeev, E. A. Ekimov, A. D. Shabrin, D. A. Litvinov, L. N. Grigoreva, S. A. Kolosov, M. A. Chernopitssky, A. Klekovkin, P. A. Forsh
Summary: In this study, a hybrid photodetector device is proposed, where the interaction of an electromagnetic field with an electron subsystem of quantum wells is enhanced by the presence of SiC nanoparticles. Experimental results and numerical calculations demonstrate that this approach can improve the sensitivity of the photodetector to electromagnetic radiation through polarization rotation, especially in the near field of SiC nanoparticles.
TECHNICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Evgeny Ekimov, Andrey A. Shiryaev, Yuriy Grigoriev, Alexey Averin, Ekaterina Shagieva, Stepan Stehlik, Mikhail Kondrin
Summary: Properties of nanodiamonds in the quantum-size region, particularly their thermal stability and optical properties, are investigated. It is found that the existing hypothesis about enhanced thermal stability of nanodiamonds smaller than 2 nm is incorrect. The appearance of an enhanced transmission band and the asymmetry of the Raman scattering peak can be explained by the resonance of the diamond Raman mode with the continuum of conductive surface states, known as the Fano effect.
Article
Chemistry, Physical
Ales Vlk, Martin Ledinsky, Andrey Shiryaev, Evgeny Ekimov, Stepan Stehlik
Summary: The bottom-up high-pressure, high-temperature synthesis method allows for unprecedented control over the size of nanodiamonds. In this study, nanodiamonds with sizes ranging from 1.2 to 8 nm were analyzed using multiwavelength Raman spectroscopy. The low-frequency acoustic Raman modes were utilized to determine the size of quantum-sized sub-3 nm nanodiamonds, showing remarkable agreement with other measurement methods such as XRD and HRTEM.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Oleg S. Kudryavtsev, Rustem H. Bagramov, Arkady M. Satanin, Andrey A. Shiryaev, Oleg I. Lebedev, Alexey M. Romshin, Dmitrii G. Pasternak, Alexander Nikolaev, Vladimir P. Filonenko, Igor I. Vlasov
Summary: Diamonds, when hydrogenated, exhibit negative electron affinity, high p-type surface electrical conductivity, and a transparency peak in the infrared absorption spectrum. This discovery opens up new possibilities for exploring the physics of electron-phonon coupling in undoped semiconductors and the application of hydrogenated nanodiamonds as a new optical material with induced transparency in the infrared range.
Article
Materials Science, Multidisciplinary
Rustem H. Bagramov, Vladimir P. Filonenko, Igor P. Zibrov, Elena A. Skryleva, Alexander V. Nikolaev, Dmitrii G. Pasternak, Igor I. Vlasov
Summary: The high-pressure synthesis of boron-doped diamonds and graphite from boron-containing organics has shown to be effective, with boron promoting the synthesis of diamond under high pressure. Under high pressure, boron-doped diamond and graphite can be synthesized from different mixtures of organic materials.
Article
Physics, Multidisciplinary
A. A. Shiryaev, E. A. Ekimov, V. Yu Prokof'ev, M. Kondrin
Summary: The temperature dependence of Fano resonance in nanodiamonds synthesized from chloroadamantane at high static pressures is investigated. Significant variations of resonance parameters are observed for the first time. The shape of Fano resonance changes considerably upon heating and completely disappears above 350 degrees C, but is recovered after cooling.
Article
Electrochemistry
A. G. Krivenko, R. A. Manzhos, V. K. Kochergin, A. S. Kotkin, Yu. V. Pleskov, M. D. Krotova, E. A. Ekimov
Summary: The diamond-compact electrode surface modified with quinone groups showed significant electrocatalytic activity for the oxygen reduction reaction, indicating the potential for applications in energy conversion devices.
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
V. S. Krivobok, E. A. Ekimov, M. V. Kondrin, S. N. Nikolaev, M. A. Chernopitssky, A. A. Deeva, D. A. Litvinov, I. I. Minaev
Summary: In this study, crystalline tin disulfide (SnS2) was successfully synthesized using the high-pressure and high-temperature (HPHT) method, and its mechanical exfoliation properties were confirmed. The synthesized SnS2 exhibited strong near-IR photoluminescence, which was attributed to a carbon-based luminescence center in the tin sublattice, as confirmed by ab initio calculations.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yongliang Chen, Chi Li, Tieshan Yang, Evgeny A. Ekimov, Carlo Bradac, Son Tung Ha, Milos Toth, Igor Aharonovich, Toan Trong Tran
Summary: All-optical nanothermometry is a powerful tool for measuring nanoscale temperatures in various applications. This study presents a real-time nanothermometry technique using codoped nanodiamonds with high sensitivity and resolution. The technique utilizes temperature sensors that emit spectrally separated fluorescence signals and a parallel detection scheme for fast readout. The method is demonstrated by monitoring temperature changes in microcircuits and MoTe2 field-effect transistors.
Article
Physics, Condensed Matter
E. A. Ekimov, M. V. Kondrin
Summary: In this study, we thoroughly investigated the vacancy-impurity complexes in 0.65 nm thick diamond nanocrystals and compared them with those in diamond nanofilms and bulk crystals. The results showed that the formation energy of these complexes in nanoobjects is lower than that in bulk crystals, and confinement effects significantly affect the band structure of nanoobjects.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Nanoscience & Nanotechnology
Yongliang Chen, Simon White, Evgeny A. Ekimov, Carlo Bradac, Milos Toth, Igor Aharonovich, Toan Trong Tran
Summary: We present an ultralow-power, optical thermometry technique for cryogenic temperatures using a two-level system in nanodiamonds. This technique achieves a relative sensitivity of about 20% K-1 at 5 K, higher than other optical nanothermometry methods, while employing excitation powers of just a few tens of nanowatts. We demonstrate its ability to accurately measure temperature differences at various locations on a custom-made microcircuit. This study is significant for the advancement of nanoscale optical thermometry at cryogenic temperatures.
Article
Nanoscience & Nanotechnology
O. P. Chernogorova, E. I. Drozdova, I. N. Lukina, V. P. Sirotinkin, A. A. Khomich, S. N. Klyamkin, E. A. Ekimov
Summary: New superelastic superhard carbon materials are obtained by hydrogenating C-60 fullerites in the solid state, resulting in increased hardness and elastic modulus. Addition of hydrogenated fullerites in composite materials can effectively improve tribological properties, such as reducing friction coefficient and increasing wear resistance.
NANOBIOTECHNOLOGY REPORTS
(2022)