Pub Date : 2024-03-21DOI: 10.1134/S2635167623600505
A. P. Filippov, T. Yu. Kirila, S. V. Rodchenko, A. V. Smirnova, N. D. Kozina, A. V. Tenkovtsev
Block copolymers of poly-2-ethyl- and poly-2-isopropyl-5,6-dihydrooxazines with different sequences of blocks relative to the terminal groups are synthesized by cationic ring-opening polymerization. It is shown by nuclear magnetic resonance (NMR) spectroscopy that the fraction of poly-2-ethyl-5,6-dihydrooxazine monomers in the copolymers is 61 and 65%. The molecular weights of the samples are 2200 and 3300 g/mol. Upon heating aqueous and water–salt solutions of block copolymers, a phase transition with the formation of supramolecular structures is found by light scattering and turbidimetry. The lower critical solution temperature (LCST) of the block copolymers is below the LCST of the more hydrophilic poly-2-ethyl-5,6-dihydrooxazine and above the LCST of the more hydrophobic poly-2-isopropyl-5,6-dihydrooxazine. An increase in the fraction of units of the latter leads to a decrease in the LCST. The addition of NaCl to solutions of copolymers induces an insignificant decrease in the temperature of phase separation.
{"title":"Self-Organization of Macromolecules of Block Copolymers of Poly-2-alkyl-5,6-dihydrooxazines in Aqueous and Water–Salt Solutions","authors":"A. P. Filippov, T. Yu. Kirila, S. V. Rodchenko, A. V. Smirnova, N. D. Kozina, A. V. Tenkovtsev","doi":"10.1134/S2635167623600505","DOIUrl":"10.1134/S2635167623600505","url":null,"abstract":"<p>Block copolymers of poly-2-ethyl- and poly-2-isopropyl-5,6-dihydrooxazines with different sequences of blocks relative to the terminal groups are synthesized by cationic ring-opening polymerization. It is shown by nuclear magnetic resonance (NMR) spectroscopy that the fraction of poly-2-ethyl-5,6-dihydrooxazine monomers in the copolymers is 61 and 65%. The molecular weights of the samples are 2200 and 3300 g/mol. Upon heating aqueous and water–salt solutions of block copolymers, a phase transition with the formation of supramolecular structures is found by light scattering and turbidimetry. The lower critical solution temperature (LCST) of the block copolymers is below the LCST of the more hydrophilic poly-2-ethyl-5,6-dihydrooxazine and above the LCST of the more hydrophobic poly-2-isopropyl-5,6-dihydrooxazine. An increase in the fraction of units of the latter leads to a decrease in the LCST. The addition of NaCl to solutions of copolymers induces an insignificant decrease in the temperature of phase separation.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S136 - S143"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1134/S263516762360092X
A. A. Blinova, A. V. Blinov, A. V. Serov, A. G. Khramtsov, Z. A. Rekhman, A. A. Gvozdenko, A. B. Golik, D. D. Filippov, M. A. Kolodkin, E. V. Zabavicheva
This paper presents the results of studying selenium nanoparticles stabilized with sodium lauryl sulfate (SLS). Selenium nanoparticles are obtained by chemical reduction in an aqueous medium. It is shown that the optimal parameters for the synthesis of nanoparticles are selenium, the concentration of selenous acid is 0.04 M, the concentration of sodium lauryl sulfate is 0.1 M, and the concentration of ascorbic acid is 0.75 M. Investigation of the effect of the medium active acidity showed that obtained selenium nanoparticles exhibit aggregation stability at a pH from 2 to 8. The analysis of a different reaction to the aggregation of the occurrence of selenium nanoparticles reveals a significant effect on the particle size of metal cations, accompanied by particle aggregation.
{"title":"Characterization and Atomic Simulation of Selenium Nanoparticles Stabilized with Sodium Lauryl Sulfate (SLS)","authors":"A. A. Blinova, A. V. Blinov, A. V. Serov, A. G. Khramtsov, Z. A. Rekhman, A. A. Gvozdenko, A. B. Golik, D. D. Filippov, M. A. Kolodkin, E. V. Zabavicheva","doi":"10.1134/S263516762360092X","DOIUrl":"10.1134/S263516762360092X","url":null,"abstract":"<div><p>This paper presents the results of studying selenium nanoparticles stabilized with sodium lauryl sulfate (SLS). Selenium nanoparticles are obtained by chemical reduction in an aqueous medium. It is shown that the optimal parameters for the synthesis of nanoparticles are selenium, the concentration of selenous acid is 0.04 M, the concentration of sodium lauryl sulfate is 0.1 M, and the concentration of ascorbic acid is 0.75 M. Investigation of the effect of the medium active acidity showed that obtained selenium nanoparticles exhibit aggregation stability at a pH from 2 to 8. The analysis of a different reaction to the aggregation of the occurrence of selenium nanoparticles reveals a significant effect on the particle size of metal cations, accompanied by particle aggregation.</p></div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S25 - S31"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1134/S2635167623600918
N. N. Kosheleva
Using the ion-beam sputtering of a composite target in an atmosphere of argon and oxygen, films based on tin dioxide with the addition of yttrium oxide are obtained. It is found that the content of the yttrium additive varies from 0.4 to 6.2 at %. It is determined that the surface roughness decreases with an increase in the addition of yttrium in films. Using a high-resolution transmission electron microscope (HRTEM), an image of the microstructure of the Sn–(5 at %)Y–O film is obtained, on which grains with a size of 5 nm are distinguishable. The roughness data coincide with the data obtained using an electron microscope. The surface resistance of the films increases with an increase in the content of the yttrium additive. The electrophysical parameters of the films after their crystallization are determined using the Hall effect. The mobility of charge carriers in the films increases, and the concentration of charge carriers decreases with an increase in the content of the additive. The gas sensitivity of films to ethanol vapors in air (3000 ppm) is studied for films with a content of 2.8 and 3.6 at % yttrium. It is found that an increase in the content of yttrium contributes to an increase in the gas sensitivity.
{"title":"On the Material of a Sensing Element Based on Tin Dioxide for a Gas Sensor","authors":"N. N. Kosheleva","doi":"10.1134/S2635167623600918","DOIUrl":"10.1134/S2635167623600918","url":null,"abstract":"<div><p>Using the ion-beam sputtering of a composite target in an atmosphere of argon and oxygen, films based on tin dioxide with the addition of yttrium oxide are obtained. It is found that the content of the yttrium additive varies from 0.4 to 6.2 at %. It is determined that the surface roughness decreases with an increase in the addition of yttrium in films. Using a high-resolution transmission electron microscope (HRTEM), an image of the microstructure of the Sn–(5 at %)Y–O film is obtained, on which grains with a size of 5 nm are distinguishable. The roughness data coincide with the data obtained using an electron microscope. The surface resistance of the films increases with an increase in the content of the yttrium additive. The electrophysical parameters of the films after their crystallization are determined using the Hall effect. The mobility of charge carriers in the films increases, and the concentration of charge carriers decreases with an increase in the content of the additive. The gas sensitivity of films to ethanol vapors in air (3000 ppm) is studied for films with a content of 2.8 and 3.6 at % yttrium. It is found that an increase in the content of yttrium contributes to an increase in the gas sensitivity.</p></div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S165 - S169"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1134/S2635167623600724
E. A. Ryndin, I. A. Mavrin, N. V. Andreeva, V. V. Luchinin
In this work a method for increasing the efficiency of hardware implementation and minimizing the number of electronic synaptic elements of asynchronous spiking neural networks in solving image identification problems is developed. The effectiveness of the proposed method is demonstrated in the process of optimizing the parameters of neurons and training the neural network on the developed software model and confirmed by the results of SPICE modeling and measurement of the signals of the neural network implemented on series electronic components.
{"title":"Neuromorphic Electronic Module Based on the Use of the Memristor Electronic-Component Base for Image Recognition","authors":"E. A. Ryndin, I. A. Mavrin, N. V. Andreeva, V. V. Luchinin","doi":"10.1134/S2635167623600724","DOIUrl":"10.1134/S2635167623600724","url":null,"abstract":"<div><p>In this work a method for increasing the efficiency of hardware implementation and minimizing the number of electronic synaptic elements of asynchronous spiking neural networks in solving image identification problems is developed. The effectiveness of the proposed method is demonstrated in the process of optimizing the parameters of neurons and training the neural network on the developed software model and confirmed by the results of SPICE modeling and measurement of the signals of the neural network implemented on series electronic components.</p></div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S194 - S202"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1134/S2635167623601183
M. N. Sorokovikov, D. A. Zverev, A. A. Barannikov, V. A. Yunkin, A. Y. Seregin, Y. A. Volkovskiy, P. A. Prosekov, V. G. Kohn, M. S. Folomeshkin, A. E. Blagov, A. A. Snigirev
The experimental study of optical properties of X-ray silicon planar compound refractive lenses at the synchrotron radiation source “KISI–Kurchatov” (Moscow, Russia) are presented. The capability to generate a submicron X-ray beam using refractive optics was demonstrated for the first time at this facility. The parameters of the focused beam were determined using the knife-edge technique. The measured minimum lateral focal spot size was 460 ± 70 nm. Additionally, the spatial structure of the beam in the focal spot area was examined. Theoretical estimates of the lenses optical properties and the corresponding computer simulation results are in agreement with the experimental data.
摘要 介绍了在同步辐射源 "KISI-Kurchatov"（俄罗斯莫斯科）对 X 射线硅平面复合折射透镜的光学特性进行的实验研究。该设施首次展示了利用折射光学产生亚微米 X 射线光束的能力。使用刀刃技术确定了聚焦光束的参数。测得的最小横向焦斑尺寸为 460 ± 70 nm。此外，还研究了焦斑区域的光束空间结构。对透镜光学特性的理论估计和相应的计算机模拟结果与实验数据一致。
{"title":"Submicron Focusing of X-rays by Silicon Planar Compound Refractive Lenses","authors":"M. N. Sorokovikov, D. A. Zverev, A. A. Barannikov, V. A. Yunkin, A. Y. Seregin, Y. A. Volkovskiy, P. A. Prosekov, V. G. Kohn, M. S. Folomeshkin, A. E. Blagov, A. A. Snigirev","doi":"10.1134/S2635167623601183","DOIUrl":"10.1134/S2635167623601183","url":null,"abstract":"<p>The experimental study of optical properties of X-ray silicon planar compound refractive lenses at the synchrotron radiation source “KISI–Kurchatov” (Moscow, Russia) are presented. The capability to generate a submicron X-ray beam using refractive optics was demonstrated for the first time at this facility. The parameters of the focused beam were determined using the knife-edge technique. The measured minimum lateral focal spot size was 460 ± 70 nm. Additionally, the spatial structure of the beam in the focal spot area was examined. Theoretical estimates of the lenses optical properties and the corresponding computer simulation results are in agreement with the experimental data.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S210 - S216"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1134/S2635167623600992
M. N. Yapryntsev, O. N. Ivanov
In this work we obtain and certify one-dimensional particles of the composition Bi2Te2.7Se0.3 of submicron size with an atypical growth direction. Further, the influence of the temperature of spark plasma sintering on the grain morphology and size, crystal-lattice parameters, elemental composition, and density of the samples obtained are investigated. The features of the formation of the crystallographic texture depending on the sintering temperature are also established. A temperature is revealed that allows for preservation of the crystal structure characteristic of the initial powder and materials with an atypical crystallographic texture to obtained. The thermoelectric properties of the materials obtained are also studied.
{"title":"Effect of the Spark-Plasma-Sintering Temperature on the Structure, Crystallographic Texture, and Thermoelectric Properties of Materials Based on One-Dimensional Particles of Bi2Te2.7Se0.3","authors":"M. N. Yapryntsev, O. N. Ivanov","doi":"10.1134/S2635167623600992","DOIUrl":"10.1134/S2635167623600992","url":null,"abstract":"<p>In this work we obtain and certify one-dimensional particles of the composition Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> of submicron size with an atypical growth direction. Further, the influence of the temperature of spark plasma sintering on the grain morphology and size, crystal-lattice parameters, elemental composition, and density of the samples obtained are investigated. The features of the formation of the crystallographic texture depending on the sintering temperature are also established. A temperature is revealed that allows for preservation of the crystal structure characteristic of the initial powder and materials with an atypical crystallographic texture to obtained. The thermoelectric properties of the materials obtained are also studied.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S90 - S100"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1134/S2635167623600761
A. L. Stepanov, V. I. Nuzhdin, V. F. Valeev, D. A. Konovalov, A. M. Rogov
The surface modification of a polished single-crystal c-Ge substrate irradiated with 115In+ ions at an energy of E = 30 keV, a current density of J = 5 μA/cm2, and a wide range of high doses D = 1.8 × 1015–7.2 × 1016 ion/cm2 is studied. The sample morphology is analyzed by high-resolution scanning electron microscopy. It is shown that when the value D = 1.9 × 1016 ion/cm2 is exceeded, the formation of a spongy porous structure (PGe) consisting of intertwining nanowires is observed. The geometric parameters of nanowires change with increasing D. Measurement of the optical reflection spectra R of the In:PGe layers demonstrated that the formed In:PGe material is characterized by a low value of the R coefficient in the spectral region of 220–1050 nm. Thus, such layer could serve as an effective antireflective coating.
研究了用能量 E = 30 keV、电流密度 J = 5 μA/cm2、高剂量 D = 1.8 × 1015-7.2 × 1016 离子/cm2 的 115In+ 离子辐照抛光单晶 c-Ge 基底的表面改性。样品形态由高分辨率扫描电子显微镜进行分析。结果表明，当超过 D = 1.9 × 1016 离子/cm2 时，会观察到由相互缠绕的纳米线组成的海绵状多孔结构（PGe）的形成。对 In:PGe 层的光学反射光谱 R 的测量表明，形成的 In:PGe 材料在 220-1050 纳米的光谱区域内 R 系数值较低。因此，这种层可以作为有效的抗反射涂层。
{"title":"Modification of the Surface of Germanium and the Formation of a Porous Layer During Implantation with Indium Ions","authors":"A. L. Stepanov, V. I. Nuzhdin, V. F. Valeev, D. A. Konovalov, A. M. Rogov","doi":"10.1134/S2635167623600761","DOIUrl":"10.1134/S2635167623600761","url":null,"abstract":"<div><p>The surface modification of a polished single-crystal <i>c</i>-Ge substrate irradiated with <sup>115</sup>In<sup>+</sup> ions at an energy of <i>E</i> = 30 keV, a current density of <i>J</i> = 5 μA/cm<sup>2</sup>, and a wide range of high doses <i>D</i> = 1.8 × 10<sup>15</sup>–7.2 × 10<sup>16</sup> ion/cm<sup>2</sup> is studied. The sample morphology is analyzed by high-resolution scanning electron microscopy. It is shown that when the value <i>D</i> = 1.9 × 10<sup>16</sup> ion/cm<sup>2</sup> is exceeded, the formation of a spongy porous structure (PGe) consisting of intertwining nanowires is observed. The geometric parameters of nanowires change with increasing <i>D</i>. Measurement of the optical reflection spectra <i>R</i> of the In:PGe layers demonstrated that the formed In:PGe material is characterized by a low value of the <i>R</i> coefficient in the spectral region of 220–1050 nm. Thus, such layer could serve as an effective antireflective coating.</p></div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S144 - S150"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1134/S2635167623601134
I. M. Asharchuk, M. V. Shibalov, A. M. Mumlyakov, P. A. Nekludova, G. D. Diudbin, N. V. Minaev, A. A. Pavlov, M. A. Tarkhov
The influence of the application of silicon oxide produced from a gas precursor, i.e., monosilane SiH4 and an organosilicon precursor, i.e., tetraethoxysilane (TEOS) on the optical characteristics of dielectric Bragg mirrors is compared. The use of tetraethoxysilane as a precursor in plasma-enhanced chemical vapor deposition (PECVD) demonstrates a decrease in the average roughness of the deposited film. The same method of film deposition also makes it possible to fabricate a SiNx/SiOx pair in one process chamber without breaking vacuum. It is experimentally shown that a mirror fabricated from a TEOS precursor possesses better characteristics than a mirror fabricated using monosilane, thus, the reflectivity increases by 20% and optical losses decrease twofold. The roughness average Ra of the surface of a SiNx/SiOx (TEOS) mirror decreases fivefold when compared to a SiNx/SiOx (SiH4) mirror. The application of a TEOS precursor substantially increases the quality of the interfaces of the deposited layers which leads to a gain in the reflectivity of the Bragg mirror and a decrease in the roughness average Ra from 11.04 down to 2.31 nm. As a consequence, improvement of the SiNx/SiOx interfaces leads to a twofold reduction in the losses. These results can be considered as a significant advantage that leads to a drop in the costs of materials during the fabrication of multilayer mirrors.
摘要 比较了由气体前驱体（即单硅烷 SiH4）和有机硅前驱体（即四乙氧基硅烷 (TEOS)）生成的氧化硅对电介质布拉格反射镜光学特性的影响。在等离子体增强化学气相沉积（PECVD）中使用四乙氧基硅烷作为前驱体，可以降低沉积薄膜的平均粗糙度。同样的薄膜沉积方法还能在一个工艺室中制造出一对 SiNx/SiOx 而不破坏真空。实验表明，用 TEOS 前驱体制作的镜子比用单硅烷制作的镜子具有更好的特性，因此反射率提高了 20%，光学损耗降低了两倍。与 SiNx/SiOx（SiH4）反射镜相比，SiNx/SiOx（TEOS）反射镜表面的平均粗糙度 Ra 降低了五倍。TEOS 前驱体的应用大大提高了沉积层界面的质量，从而提高了布拉格反射镜的反射率，并将平均粗糙度 Ra 从 11.04 纳米降至 2.31 纳米。因此，SiNx/SiOx 接口的改善使损耗降低了两倍。这些结果可被视为一项重大优势，可降低多层反射镜制造过程中的材料成本。
{"title":"Comparing the Optical Characteristics of Dielectric Mirrors Fabricated by PECVD from Different Precursors: Monosilane and Tetraethoxysilane","authors":"I. M. Asharchuk, M. V. Shibalov, A. M. Mumlyakov, P. A. Nekludova, G. D. Diudbin, N. V. Minaev, A. A. Pavlov, M. A. Tarkhov","doi":"10.1134/S2635167623601134","DOIUrl":"10.1134/S2635167623601134","url":null,"abstract":"<p>The influence of the application of silicon oxide produced from a gas precursor, i.e., monosilane SiH<sub>4</sub> and an organosilicon precursor, i.e., tetraethoxysilane (TEOS) on the optical characteristics of dielectric Bragg mirrors is compared. The use of tetraethoxysilane as a precursor in plasma-enhanced chemical vapor deposition (PECVD) demonstrates a decrease in the average roughness of the deposited film. The same method of film deposition also makes it possible to fabricate a SiN<sub><i>x</i></sub>/SiO<sub><i>x</i></sub> pair in one process chamber without breaking vacuum. It is experimentally shown that a mirror fabricated from a TEOS precursor possesses better characteristics than a mirror fabricated using monosilane, thus, the reflectivity increases by 20% and optical losses decrease twofold. The roughness average <i>R</i><sub>a</sub> of the surface of a SiN<sub><i>x</i></sub>/SiO<sub><i>x</i></sub> (TEOS) mirror decreases fivefold when compared to a SiN<sub><i>x</i></sub>/SiO<sub><i>x</i></sub> (SiH<sub>4</sub>) mirror. The application of a TEOS precursor substantially increases the quality of the interfaces of the deposited layers which leads to a gain in the reflectivity of the Bragg mirror and a decrease in the roughness average <i>R</i><sub>a</sub> from 11.04 down to 2.31 nm. As a consequence, improvement of the SiN<sub><i>x</i></sub>/SiO<sub><i>x</i></sub> interfaces leads to a twofold reduction in the losses. These results can be considered as a significant advantage that leads to a drop in the costs of materials during the fabrication of multilayer mirrors.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S63 - S68"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1134/S2635167623600906
M. A. Pakhomov, A. A. Dmitrievsky, V. V. Stolyarov
Investigations of the mechanical and conductive properties of Al2O3 nanoceramics containing graphene from 0.5 to 2 wt %, processed by the plasma-spark sintering method, are conducted. The optimal content of graphene in Al2O3 ceramics is determined. It is shown that the addition of 0.5–1 wt % of graphene contributes to an increase in the nanohardness (by 13%) and fracture toughness (not less than 27%). It is established that the elastic modulus of Al2O3 ceramics does not depend on the graphene content, but decreases in a gradient with displacement of the diagnosed area from the center to the periphery. The possibility of a significant decrease in the electrical resistance with an increase in the temperature of the composite and the frequency of the alternating current is demonstrated.
{"title":"Mechanical and Dielectric Properties of Al2O3/Graphene Nanocomposite Ceramics","authors":"M. A. Pakhomov, A. A. Dmitrievsky, V. V. Stolyarov","doi":"10.1134/S2635167623600906","DOIUrl":"10.1134/S2635167623600906","url":null,"abstract":"<div><p>Investigations of the mechanical and conductive properties of Al<sub>2</sub>O<sub>3</sub> nanoceramics containing graphene from 0.5 to 2 wt %, processed by the plasma-spark sintering method, are conducted. The optimal content of graphene in Al<sub>2</sub>O<sub>3</sub> ceramics is determined. It is shown that the addition of 0.5–1 wt % of graphene contributes to an increase in the nanohardness (by 13%) and fracture toughness (not less than 27%). It is established that the elastic modulus of Al<sub>2</sub>O<sub>3</sub> ceramics does not depend on the graphene content, but decreases in a gradient with displacement of the diagnosed area from the center to the periphery. The possibility of a significant decrease in the electrical resistance with an increase in the temperature of the composite and the frequency of the alternating current is demonstrated.</p></div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S32 - S36"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1134/S2635167623600773
Yu. M. Spivak, E. N. Muratova, V. P. Bezverkhniy, V. A. Moshnikov
A comprehensive analysis of the current level of research in the development of intelligent hybrid nanosystems based on porous inorganic materials, in particular porous alumina, is carried out. The presented works show interesting opportunities for the development of intelligent, multifunctional optical devices with a microchip design.
{"title":"Porous Aluminum Oxide for Medical Applications Including Targeted Drug Delivery","authors":"Yu. M. Spivak, E. N. Muratova, V. P. Bezverkhniy, V. A. Moshnikov","doi":"10.1134/S2635167623600773","DOIUrl":"10.1134/S2635167623600773","url":null,"abstract":"<p>A comprehensive analysis of the current level of research in the development of intelligent hybrid nanosystems based on porous inorganic materials, in particular porous alumina, is carried out. The presented works show interesting opportunities for the development of intelligent, multifunctional optical devices with a microchip design.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 1 supplement","pages":"S37 - S47"},"PeriodicalIF":0.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142412898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号