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Plasma-Chemical Method of Silicon Carbide Modification to Obtain Particles with Controlled Surface Morphology 用等离子体化学方法对碳化硅进行改性以获得表面形态可控的颗粒
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S1063785023180189
T. A. Shalygina, M. S. Rudenko, I. V. Nemtsev, V. A. Parfenov, S. Yu. Voronina
{"title":"Plasma-Chemical Method of Silicon Carbide Modification to Obtain Particles with Controlled Surface Morphology","authors":"T. A. Shalygina,&nbsp;M. S. Rudenko,&nbsp;I. V. Nemtsev,&nbsp;V. A. Parfenov,&nbsp;S. Yu. Voronina","doi":"10.1134/S1063785023180189","DOIUrl":"10.1134/S1063785023180189","url":null,"abstract":"<p>A plasma-chemical method for the modification of silicon carbide particles is presented, which makes it possible to obtain particles with a controlled surface morphology. The variable parameter of particle processing was the ratio of the fraction of plasma-forming (Ar) and additional (H) gases. It was shown that at Ar/H = 100/0, the formation of a carbon shell is observed; at Ar/H ratios of 91/9 and 84/16, the particles are characterized by a carbon shell decorated with silicon nanoparticles or nanowires, respectively. The modified particles were analyzed using scanning electron microscopy and Raman spectroscopy.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"239 - 243"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Growth Mechanism of Monolayer on the Top Facet of Ga-Catalyzed GaAs and GaP Nanowires 镓催化砷化镓和磷化镓纳米线顶面单层的生长机制
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S1063785023170133
A. A. Koryakin, Yu. A. Eremeev, S. V. Fedina, V. V. Fedorov
{"title":"Growth Mechanism of Monolayer on the Top Facet of Ga-Catalyzed GaAs and GaP Nanowires","authors":"A. A. Koryakin,&nbsp;Yu. A. Eremeev,&nbsp;S. V. Fedina,&nbsp;V. V. Fedorov","doi":"10.1134/S1063785023170133","DOIUrl":"10.1134/S1063785023170133","url":null,"abstract":"<p><b>Abstract</b>—The growth mechanism of monolayer on the top facet of Ga-catalyzed GaAs and GaP nanowires is investigated. Within the framework of a theoretical model, the maximal monolayer coverage due to the material in the catalyst droplet, the nanowire growth rate and the content of group V atoms in the droplet are found depending on the growth conditions. The estimates of the phosphorus re-evaporation coefficient from neighboring nanowires and substrate are obtained by comparing the theoretical and experimental growth rate of Ga-catalyzed GaP nanowires.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"129 - 132"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Effect of He:O Plasma Treatment on the Structure of Multi-Walled Carbon Nanotubes 等离子体 He:O 处理对多壁碳纳米管结构的影响
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S1063785023180037
V. V. Bolotov, E. V. Knyazev, S. N. Nesov
{"title":"The Effect of He:O Plasma Treatment on the Structure of Multi-Walled Carbon Nanotubes","authors":"V. V. Bolotov,&nbsp;E. V. Knyazev,&nbsp;S. N. Nesov","doi":"10.1134/S1063785023180037","DOIUrl":"10.1134/S1063785023180037","url":null,"abstract":"<p>The functionalization of multi-walled carbon nanotubes in He:O plasma is investigated. It is shown that plasma treatment leads to the removal of defective outer graphene layers and their fragments due to oxidation. It is established that the surface of functionalized multi-walled carbon nanotubes contains numerous uncoordinated carbon atoms and oxygen-containing functional groups. The preservation of the structure of the internal graphene layers of nanotubes and the formation of broken chemical bonds ensure a decrease in electrical resistance. At the same time, there is a narrowing of the distribution of electrical resistance values of nanotube ensembles.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"178 - 181"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ferroelectric Properties of Heterostructure Sr0.5Ba0.5Nb2O6/Ba0.2Sr0.8TiO3/Si(001) Sr0.5Ba0.5Nb2O6/Ba0.2Sr0.8TiO3/Si(001) 异质结构的铁电特性
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S1063785023180050
D. A. Kiselev, A. V. Pavlenko, S. P. Zinchenko
{"title":"Ferroelectric Properties of Heterostructure Sr0.5Ba0.5Nb2O6/Ba0.2Sr0.8TiO3/Si(001)","authors":"D. A. Kiselev,&nbsp;A. V. Pavlenko,&nbsp;S. P. Zinchenko","doi":"10.1134/S1063785023180050","DOIUrl":"10.1134/S1063785023180050","url":null,"abstract":"<p>The properties of <b><i>c</i></b>-oriented thin films of Sr<sub>0.5</sub>Ba<sub>0.5</sub>Nb<sub>2</sub>O<sub>6</sub> grown on a Si(001) (<i>p</i>-type) substrate with a pre-deposited Ba<sub>0.2</sub>Sr<sub>0.8</sub>TiO<sub>3</sub> layer were studied using scanning probe microscopy and dielectric spectroscopy. It is established that the Sr<sub>0.5</sub>Ba<sub>0.5</sub>Nb<sub>2</sub>O<sub>6</sub> films are characterized by low surface roughness (less than 6 nm) and average crystallite size of ~93 nm. It is shown that there is spontaneous polarization in the film directed from its surface to the substrate, which causes the manifestation of the field effect for the case of the Si substrate with <i>p</i>-type conductivity without the external field effect. Differences in the magnitudes of the surface potential signal for regions polarized by an external electric field of different polarities (+10 and –10 V), as well as in their relaxation to the initial state, are revealed. The reasons for the established patterns are discussed.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"186 - 189"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Losses Measurement Method for Transmission Lines at mmWave 毫米波传输线损耗测量方法
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S106378502317011X
N. S. Knyazev, A. I. Malkin, V. A. Chechetkin
{"title":"Losses Measurement Method for Transmission Lines at mmWave","authors":"N. S. Knyazev,&nbsp;A. I. Malkin,&nbsp;V. A. Chechetkin","doi":"10.1134/S106378502317011X","DOIUrl":"10.1134/S106378502317011X","url":null,"abstract":"<p><b>Abstract</b>—An experimental method was developed to determine losses in microstrip and coplanar transmission lines for devices operating in the frequency range of 77–81 GHz. The parameters of the scattering matrices are obtained using a vector network analyzer and frequency upconverters. The calculation of losses in waveguide-coplanar and coplanar-microstrip adapters is made.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"122 - 124"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stability of Functional Characteristics of Transparent Electrodes Based on the ZnO:Ga/Ag/ZnO:Ga Multilayer Structure 基于ZnO:Ga/Ag/ZnO:Ga多层结构的透明电极功能特性稳定性
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S1063785023170042
A. Sh. Asvarov, A. K. Akhmedov, A. E. Muslimov, V. M. Kanevsky
{"title":"Stability of Functional Characteristics of Transparent Electrodes Based on the ZnO:Ga/Ag/ZnO:Ga Multilayer Structure","authors":"A. Sh. Asvarov,&nbsp;A. K. Akhmedov,&nbsp;A. E. Muslimov,&nbsp;V. M. Kanevsky","doi":"10.1134/S1063785023170042","DOIUrl":"10.1134/S1063785023170042","url":null,"abstract":"<p><b>Abstract</b>—Since the stability of functional properties of a transparent conducting three-layer structure ZnO:Ga/Ag/ZnO:Ga is important for practical application, we studied its long-term durability and thermal stability in air environment. It has been demonstrated that after prolonged interaction with the air environment at room temperature (for ~1000 days) and further heat treatment in air at temperatures of up to 450°C (for up to 10 h), the three-layer structure retains its integrity and is characterized by a low sheet resistance <i>R</i><sub><i>s</i></sub> = 2.8 Ohm/sq at average transmittance in the visible range <i>T</i><sub>av</sub> = 82.1%.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"98 - 101"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145122551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Obtaining of Regular Metal and Dielectric Microstructures Based on Irradiation–Modified Polymer Films 基于辐照改性聚合物薄膜的规则金属和介电微观结构的制备
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S1063785023170030
V. E. Asadchikov, S. A. Bedin, V. V. Berezkin, A. B. Vasiliev, Yu. V. Grigoriev, I. G. Dyachkova, A. A. Konovko, V. P. Nazmov, N. V. Minaev, E. O. Epifanov
{"title":"The Obtaining of Regular Metal and Dielectric Microstructures Based on Irradiation–Modified Polymer Films","authors":"V. E. Asadchikov,&nbsp;S. A. Bedin,&nbsp;V. V. Berezkin,&nbsp;A. B. Vasiliev,&nbsp;Yu. V. Grigoriev,&nbsp;I. G. Dyachkova,&nbsp;A. A. Konovko,&nbsp;V. P. Nazmov,&nbsp;N. V. Minaev,&nbsp;E. O. Epifanov","doi":"10.1134/S1063785023170030","DOIUrl":"10.1134/S1063785023170030","url":null,"abstract":"<p><b>Abstract</b>—Based on regular porous polymeric membranes, the synthesis of metal and dielectric spearhead structures with given morphological characteristics was carried out. Copper structures with the ~1 μm height and dielectric spearhead microstructures made from iodic acid with the 12 μm height and 1 μm diameter were obtained. The possibility is discussed of using such optical elements to solve the problems of increasing the efficiency of IR radiation detection, signal amplification and conversion to visible and near-infrared ranges.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"95 - 97"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145122570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Temporal Pattern of Microcracking in Impact–Damaged Porous SiC Ceramics 冲击损坏的多孔碳化硅陶瓷中微裂纹的时间模式
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S1063785023170212
I. P. Shcherbakov, A. G. Kadomtsev, A. E. Chmel
{"title":"Temporal Pattern of Microcracking in Impact–Damaged Porous SiC Ceramics","authors":"I. P. Shcherbakov,&nbsp;A. G. Kadomtsev,&nbsp;A. E. Chmel","doi":"10.1134/S1063785023170212","DOIUrl":"10.1134/S1063785023170212","url":null,"abstract":"<p><b>Abstract</b>—Temporal characteristics of the localized damage development initiated by a short-time impact pointed loading of SiC ceramics which is widely applied as a protective material against the shock action upon engineering constructions and people were investigated. The statistics of crack nucleation and relaxation was studied with the methods of acoustic emission and electromagnetic emission, correspondingly. It was shown that the length of intervals between microcrack nucleations follows a power law specific to cooperative phenomena. The time distribution of decaying electric charges which appear on impact-induced crack edges and annihilate after the passage of impact wave was, in contrast, linear. The temporal pattern of the crack relaxation permitted identifying two sets of newly formed damages that are the tiny cracks localized in the grain bulk and those that interconnect grains.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"160 - 163"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Acousto-Optic Wavelet Processing of Bioelectric Signals 生物电信号的声光小波处理
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S1063785023170236
K. V. Zaichenko, B. S. Gurevich
{"title":"Acousto-Optic Wavelet Processing of Bioelectric Signals","authors":"K. V. Zaichenko,&nbsp;B. S. Gurevich","doi":"10.1134/S1063785023170236","DOIUrl":"10.1134/S1063785023170236","url":null,"abstract":"<p><b>Abstract</b>—Wavelet analysis is one of the most efficient methods of the informative signals characteristics investigation. First shown the possibility of informative signals wavelet processing by means of the acousto-optic processor with time integration. The possibility of the realization of both power spectrum calculation and performance of wavelet transform of bioelectric signals in the real time mode has been proved. The analysis is listed which describes its operation in different modes.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"168 - 170"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analytical Solution of the Problem of Synthesis of Three-Link Stepped Chebyshev’s Microwave Filter 三链路阶跃切比雪夫微波滤波器合成问题的解析解
IF 0.9 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/S1063785023180025
A. S. Aref’ev
{"title":"Analytical Solution of the Problem of Synthesis of Three-Link Stepped Chebyshev’s Microwave Filter","authors":"A. S. Aref’ev","doi":"10.1134/S1063785023180025","DOIUrl":"10.1134/S1063785023180025","url":null,"abstract":"<p>The problem of synthesis of the three-link stepped Chebyshev’s microwave filter is reduced to two independent fourth-degree equations, including a single link wave impedance as unknown. The solution of Descartes—Euler is applied to these equations. It is proved that, in case wave impedances of extreme links are equal, the problem of the filter synthesis has two solutions. Identical phase-frequency responses correspond to these solutions. It is proved that for each link a product of the wave impedances relating to these solutions is equal to a square of the wave impedance of the transmission line including the filter.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 2","pages":"174 - 177"},"PeriodicalIF":0.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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