Pub Date : 2021-09-27DOI: 10.15625/0868-3166/15702
Dan Nguyen Huy, Xuan Hau Kieu, Hai Yen Nguyen, T. Pham, H.N. Nguyen, Doan Nuoi Dang, D. Tran
Shape memory alloys (SMAs) are ones which can return to their original shape under impact of temperature or external magnetic field. The SMAs are capable of many applications in the fields of biomedical, aerospace, microelectronics, automation, for examples, orthodontics, stents, bone anchors, automatic valves, heat sensors, nanotweezers, robots... Recently, researchers have discovered the shape memory effect (SME) on high entropy alloys (HEAs). The combination of superior properties of SMAs and HEAs (high strength, heat resistance, low diffusion coefficient...) would bring useful practical applications in practice. In this paper, we will present an overview of the research situation of SMAs and our initial results obtained on Ni-Ti based alloys of Ni-Ti, Ni-Ti-Zr-Cu-Cr, Ni-Ti-Zr-Cu-Co, Ni-Ti-Zr-Cu-Nb, and Ni-Ti-Zr-Cu-Hf prepared by melt-spinning method.
形状记忆合金(sma)是指在温度或外加磁场的作用下能够恢复其原始形状的合金。sma能够在生物医学、航空航天、微电子、自动化等领域得到许多应用，例如，正畸、支架、骨锚、自动阀门、热传感器、纳米镊子、机器人……近年来，研究人员发现了高熵合金(HEAs)的形状记忆效应。SMAs和HEAs具有高强度、耐热、低扩散系数等优点，在实际应用中具有广泛的应用前景。本文综述了熔融纺丝法制备Ni-Ti、Ni-Ti- zr - cu - cr、Ni-Ti- zr - cu - co、Ni-Ti- zr - cu - nb和Ni-Ti- zr - cu - hf等Ni-Ti基合金的研究现状和初步成果。
{"title":"Investigation of shape memory effect in Ni-Ti based alloys","authors":"Dan Nguyen Huy, Xuan Hau Kieu, Hai Yen Nguyen, T. Pham, H.N. Nguyen, Doan Nuoi Dang, D. Tran","doi":"10.15625/0868-3166/15702","DOIUrl":"https://doi.org/10.15625/0868-3166/15702","url":null,"abstract":"Shape memory alloys (SMAs) are ones which can return to their original shape under impact of temperature or external magnetic field. The SMAs are capable of many applications in the fields of biomedical, aerospace, microelectronics, automation, for examples, orthodontics, stents, bone anchors, automatic valves, heat sensors, nanotweezers, robots... Recently, researchers have discovered the shape memory effect (SME) on high entropy alloys (HEAs). The combination of superior properties of SMAs and HEAs (high strength, heat resistance, low diffusion coefficient...) would bring useful practical applications in practice. In this paper, we will present an overview of the research situation of SMAs and our initial results obtained on Ni-Ti based alloys of Ni-Ti, Ni-Ti-Zr-Cu-Cr, Ni-Ti-Zr-Cu-Co, Ni-Ti-Zr-Cu-Nb, and Ni-Ti-Zr-Cu-Hf prepared by melt-spinning method.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77020506","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 : 2021-09-27DOI: 10.15625/0868-3166/15899
Q. Luong, Tran Cao Dao, T. T. Vu, Manh Cuong Nguyen, Nhu Duong Nguyen
Surface-enhanced Raman spectroscopy (SERS) is increasingly being used as a method for detecting traces of contaminants in a variety of specimens. In order to maximize SERS’s performance, the most important thing is to have highly active SERS substrates. In this report, we present a simple method for synthesizing silver nanodendrites (AgNDs) on the surface of a copper (Cu) plate using chemical deposition method. The results showed that, after fabrication, a large number of fern-like AgNDs formed on the Cu surface. These AgNDs are distributed evenly across the entire Cu surface with a relatively thick density. The prepared AgNDs were applied as SERS substrates for detecting Rhodamine 6G (R6G) in chili powders. The results showed that, using the prepared AgNDs substrates, as low as 10−10 M R6G in chili powders can be detected. This demonstrates the applicability of fabricated AgNDs as a highly active SERS substrate.
{"title":"Fabrication of Silver Nanodendrites on Copper for Detecting Rhodamine 6G in Chili Powder Using Surface-enhanced Raman Spectroscopy","authors":"Q. Luong, Tran Cao Dao, T. T. Vu, Manh Cuong Nguyen, Nhu Duong Nguyen","doi":"10.15625/0868-3166/15899","DOIUrl":"https://doi.org/10.15625/0868-3166/15899","url":null,"abstract":"Surface-enhanced Raman spectroscopy (SERS) is increasingly being used as a method for detecting traces of contaminants in a variety of specimens. In order to maximize SERS’s performance, the most important thing is to have highly active SERS substrates. In this report, we present a simple method for synthesizing silver nanodendrites (AgNDs) on the surface of a copper (Cu) plate using chemical deposition method. The results showed that, after fabrication, a large number of fern-like AgNDs formed on the Cu surface. These AgNDs are distributed evenly across the entire Cu surface with a relatively thick density. The prepared AgNDs were applied as SERS substrates for detecting Rhodamine 6G (R6G) in chili powders. The results showed that, using the prepared AgNDs substrates, as low as 10−10 M R6G in chili powders can be detected. This demonstrates the applicability of fabricated AgNDs as a highly active SERS substrate.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86203407","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 : 2021-08-29DOI: 10.15625/0868-3166/16496
Nguyen Tri Toan Phuc, K. Ogata, Nguyễn Hoàng Phúc, B. Linh, V. H. Hải, L. X. Chung
We investigate the impact of ambiguities coming from the choice of optical potentials and nucleon-nucleon scattering cross sections on the spectroscopic factors extracted from the (^{12})C((p,2p)^{11})B reaction. These ambiguities are evaluated by analyzing the cross sections of the (^{12})C((p,2p)^{11})B reaction at 100 and 200 MeV within the framework of the distorted-wave impulse approximation with realistic choices of nuclear inputs. The results show that the studied ambiguities are considerably large in this energy region and careful choices of nuclear inputs used in the reaction calculations are required to extract reliable structure information.
我们研究了选择光势和核子-核子散射截面所产生的模糊性对从(^{12}) C ((p,2p)^{11}) B反应中提取的光谱因子的影响。通过分析(^{12}) C ((p,2p)^{11}) B反应在100 MeV和200 MeV下的截面，并结合实际选择的核输入，对这些模糊性进行了评价。结果表明，研究的歧义在该能量区域相当大，在反应计算中需要仔细选择核输入以提取可靠的结构信息。
{"title":"Ambiguities from Nuclear Interactions in the (^{12})C(p,2p)(^{11})B Reaction","authors":"Nguyen Tri Toan Phuc, K. Ogata, Nguyễn Hoàng Phúc, B. Linh, V. H. Hải, L. X. Chung","doi":"10.15625/0868-3166/16496","DOIUrl":"https://doi.org/10.15625/0868-3166/16496","url":null,"abstract":"We investigate the impact of ambiguities coming from the choice of optical potentials and nucleon-nucleon scattering cross sections on the spectroscopic factors extracted from the (^{12})C((p,2p)^{11})B reaction. These ambiguities are evaluated by analyzing the cross sections of the (^{12})C((p,2p)^{11})B reaction at 100 and 200 MeV within the framework of the distorted-wave impulse approximation with realistic choices of nuclear inputs. The results show that the studied ambiguities are considerably large in this energy region and careful choices of nuclear inputs used in the reaction calculations are required to extract reliable structure information.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83886929","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 : 2021-07-09DOI: 10.15625/0868-3166/2021/16002
Nguyen Tri Toan Phuc, Nguyễn Hoàng Phúc, D. T. Khoa
The elastic scattering cross section measured at energies $Elesssim 10$ MeV/nucleon for some light heavy-ion systems having two identical cores like oc exhibits an enhanced oscillatory pattern at the backward angles. Such a pattern is known to be due to the transfer of the valence nucleon or cluster between the two identical cores. In particular, the elastic $alpha$ transfer has been shown to originate directly from the core-exchange symmetry in the elastic oc scattering. Given the strong transition strength of the $2^+_1$ state of $^{12}$C and its large overlap with the $^{16}$O ground state, it is natural to expect a similar $alpha$ transfer process (or inelastic $alpha$ transfer) to take place in the inelastic oc scattering. The present work provides a realistic coupled channel description of the $alpha$ transfer in the inelastic oc scattering at low energies. Based on the results of the 4 coupled reaction-channels calculation, we show a significant contribution of the $alpha$ transfer to the inelastic oc scattering cross section at the backward angles. These results suggest that the explicit coupling to the $alpha$ transfer channels is crucial in the studies of the elastic and inelastic scattering of a nucleus-nucleus system with the core-exchange symmetry.Keywords{optical potential, coupled reaction channels, inelastic $alpha$ transfer
{"title":"ELASTIC AND INELASTIC ALPHA TRANSFER IN THE 16O+12C SCATTERING","authors":"Nguyen Tri Toan Phuc, Nguyễn Hoàng Phúc, D. T. Khoa","doi":"10.15625/0868-3166/2021/16002","DOIUrl":"https://doi.org/10.15625/0868-3166/2021/16002","url":null,"abstract":"The elastic scattering cross section measured at energies $Elesssim 10$ MeV/nucleon for some light heavy-ion systems having two identical cores like oc exhibits an enhanced oscillatory pattern at the backward angles. Such a pattern is known to be due to the transfer of the valence nucleon or cluster between the two identical cores. In particular, the elastic $alpha$ transfer has been shown to originate directly from the core-exchange symmetry in the elastic oc scattering. Given the strong transition strength of the $2^+_1$ state of $^{12}$C and its large overlap with the $^{16}$O ground state, it is natural to expect a similar $alpha$ transfer process (or inelastic $alpha$ transfer) to take place in the inelastic oc scattering. The present work provides a realistic coupled channel description of the $alpha$ transfer in the inelastic oc scattering at low energies. Based on the results of the 4 coupled reaction-channels calculation, we show a significant contribution of the $alpha$ transfer to the inelastic oc scattering cross section at the backward angles. These results suggest that the explicit coupling to the $alpha$ transfer channels is crucial in the studies of the elastic and inelastic scattering of a nucleus-nucleus system with the core-exchange symmetry.Keywords{optical potential, coupled reaction channels, inelastic $alpha$ transfer","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83871109","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 : 2021-07-04DOI: 10.15625/0868-3166/2021/16029
N. M. Thang, Manh Thang Nguyen, Q. Ho
In this paper, a model of dual-beam nonlinear Fabry-Perot interferometer (DBNFPI) for creation laser hollow-Gaussian beam (HGB) is investigated. It includes a thin film of organic dye sandwiched between two optical mirrors, and irradiated by two signal and pump laser Gaussian beams. Based on the equation describing the output-input relation of intensities concerning pump intensity and the expression of the spatial intensity distribution of output signal beam (OSB), the range of pump intensity and collection of designed parameters are numerically calculated and discussed for HGB creation. These results give us the opportunity to use DBNFPI for optical trap of low-index dielectric particles.
{"title":"Creation of Hollow-Gaussian Beam for Optical Trap by Dual-beam Nonliear Fabry-perot Interferometer","authors":"N. M. Thang, Manh Thang Nguyen, Q. Ho","doi":"10.15625/0868-3166/2021/16029","DOIUrl":"https://doi.org/10.15625/0868-3166/2021/16029","url":null,"abstract":"In this paper, a model of dual-beam nonlinear Fabry-Perot interferometer (DBNFPI) for creation laser hollow-Gaussian beam (HGB) is investigated. It includes a thin film of organic dye sandwiched between two optical mirrors, and irradiated by two signal and pump laser Gaussian beams. Based on the equation describing the output-input relation of intensities concerning pump intensity and the expression of the spatial intensity distribution of output signal beam (OSB), the range of pump intensity and collection of designed parameters are numerically calculated and discussed for HGB creation. These results give us the opportunity to use DBNFPI for optical trap of low-index dielectric particles.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75218616","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 : 2021-07-04DOI: 10.15625/0868-3166/2021/15933
L. Việt
In this research, Au nanoparticles were successfully synthesized by modified polyol method with commercial precursors to be gold (III) chloride trihydrate (HAuCl4·3H2O), ethylene glycol (EG), poly(vinylpyrrolidone) (PVP), sodium borohydride (NaBH4). The structure and properties of as-prepared Au nanoparticles have been investigated by X ray diffraction (XRD), transmission electron microscopy (TEM), and UV-vis-NIR spectroscopy. As a result, Au nanoparticles with the average particle size of 28.80 nm were successfully synthesized in the range of about 50 nm. It is evidenced that the assembly of gold nanoparticles was presented in their nucleation, growth, and formation.
{"title":"Structure and Optical Property of Gold Nanoparticles Synthesized by Modified Polyol Method","authors":"L. Việt","doi":"10.15625/0868-3166/2021/15933","DOIUrl":"https://doi.org/10.15625/0868-3166/2021/15933","url":null,"abstract":"In this research, Au nanoparticles were successfully synthesized by modified polyol method with commercial precursors to be gold (III) chloride trihydrate (HAuCl4·3H2O), ethylene glycol (EG), poly(vinylpyrrolidone) (PVP), sodium borohydride (NaBH4). The structure and properties of as-prepared Au nanoparticles have been investigated by X ray diffraction (XRD), transmission electron microscopy (TEM), and UV-vis-NIR spectroscopy. As a result, Au nanoparticles with the average particle size of 28.80 nm were successfully synthesized in the range of about 50 nm. It is evidenced that the assembly of gold nanoparticles was presented in their nucleation, growth, and formation. ","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79033035","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 : 2021-05-14DOI: 10.15625/0868-3166/15823
D. Nga, V. V. Huy, C. V. Ha
Optical properties of protein-conjugated metallic nanowires are theoretically investigated based on the Mie theory and the core-shell model. Our numerical calculations show that optical spectra of protein-conjugated nanowires can have more a maximum compared to these nanowires without biomolecules. This finding is in a good agreement with previous experiments. We provide better interpretation for the origin of optical peaks in absorption spectrum of nanowires. Our results can be used for designing biosensors and bio-detectors.
{"title":"Optical Properties of Silver Nanowires Conjugated with Protein","authors":"D. Nga, V. V. Huy, C. V. Ha","doi":"10.15625/0868-3166/15823","DOIUrl":"https://doi.org/10.15625/0868-3166/15823","url":null,"abstract":"Optical properties of protein-conjugated metallic nanowires are theoretically investigated based on the Mie theory and the core-shell model. Our numerical calculations show that optical spectra of protein-conjugated nanowires can have more a maximum compared to these nanowires without biomolecules. This finding is in a good agreement with previous experiments. We provide better interpretation for the origin of optical peaks in absorption spectrum of nanowires. Our results can be used for designing biosensors and bio-detectors.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81075160","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 : 2021-04-16DOI: 10.15625/0868-3166/15905
D. Le, Van-Hoang Le
We review some normed division algebras R,C,H,O applications to the monopole physics and MICZ-Kepler problems. More specifically, we will briefly review some results in applying the normed division algebras to interpret the existence of Dirac, Yang, and SO(8) monopoles. These monopoles also appear during the examination of the duality between isotropic harmonic oscillators and the MICZ-Kepler problems. We also revisit some of our newest results in the ninedimensional MICZ-Kepler problem using the generalized Hurwitz transformation.
{"title":"Normed Division Algebras Application to the Monopole Physics","authors":"D. Le, Van-Hoang Le","doi":"10.15625/0868-3166/15905","DOIUrl":"https://doi.org/10.15625/0868-3166/15905","url":null,"abstract":"We review some normed division algebras R,C,H,O applications to the monopole physics and MICZ-Kepler problems. More specifically, we will briefly review some results in applying the normed division algebras to interpret the existence of Dirac, Yang, and SO(8) monopoles. These monopoles also appear during the examination of the duality between isotropic harmonic oscillators and the MICZ-Kepler problems. We also revisit some of our newest results in the ninedimensional MICZ-Kepler problem using the generalized Hurwitz transformation.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"93 5 1","pages":"235"},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88384889","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 : 2021-04-16DOI: 10.15625/0868-3166/15668
Nhung Nguyen, T. X. Hoang
Surfaces with engineered microtopographies are potential candidate against biofouling to replace the use of biocides in the marine environment. Understanding the antifouling mechanism of microtopographic surfaces against marine microorganisms, however, has been limited. In this work, we theoretically studied the aggregation of Ulva linza zoospores on the Sharklet topographic surfaces by employing the extended Surface Energetic Attachment (SEA) model proposedin a previous work. The energy parameters of the model were obtained by matching theoretical results with experimental data for one type of Sharklet surface. Monte Carlo simulations were then carried out for a series of Sharklet surfaces with various numbers of distinct features. Inagreement with prior experimental results, our simulations indicate that engineered topographies promote smaller aggregates than those on a smooth surface. Furthermore, we show that the maximum effect of the Sharklet topography on the aggregate size of U. linza can be obtained with just 3 distinct features.
具有工程微形貌的表面是防止生物污染的潜在候选者，可以取代海洋环境中杀菌剂的使用。然而，对微地形表面对海洋微生物的防污机制的了解仍然有限。本文采用前人提出的扩展表面能量附着(SEA)模型，从理论上研究了小鲨鱼地形表面上linza游动孢子的聚集。通过对某一类Sharklet曲面的理论结果与实验数据进行匹配，得到了模型的能量参数。然后对一系列具有不同数量不同特征的Sharklet曲面进行了蒙特卡罗模拟。与先前的实验结果一致，我们的模拟表明，工程地形比光滑表面上的地形促进更小的聚集体。此外，我们还表明，Sharklet地形对linza U. aggregate size的最大影响可以在3个不同的特征下获得。
{"title":"Aggregation of Zoospores on Sharklet Microtopographic Surfaces","authors":"Nhung Nguyen, T. X. Hoang","doi":"10.15625/0868-3166/15668","DOIUrl":"https://doi.org/10.15625/0868-3166/15668","url":null,"abstract":"Surfaces with engineered microtopographies are potential candidate against biofouling to replace the use of biocides in the marine environment. Understanding the antifouling mechanism of microtopographic surfaces against marine microorganisms, however, has been limited. In this work, we theoretically studied the aggregation of Ulva linza zoospores on the Sharklet topographic surfaces by employing the extended Surface Energetic Attachment (SEA) model proposedin a previous work. The energy parameters of the model were obtained by matching theoretical results with experimental data for one type of Sharklet surface. Monte Carlo simulations were then carried out for a series of Sharklet surfaces with various numbers of distinct features. Inagreement with prior experimental results, our simulations indicate that engineered topographies promote smaller aggregates than those on a smooth surface. Furthermore, we show that the maximum effect of the Sharklet topography on the aggregate size of U. linza can be obtained with just 3 distinct features.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81976161","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 : 2021-04-16DOI: 10.15625/0868-3166/15916
T. V. Pham
In this study, tin oxide /reduced graphene oxide (SnO2/rGO) samples were prepared by hydrothermal method. The structural characteristics, phase composition, morphology, and size of the samples were studied by X-ray diffraction, Raman scattering spectroscopy, and scanning electron microscopy. Results showed that SnO2 nanoparticles had tetragonal rutile crystal structure with a size ranging from 4.65 nm to 5.77 nm when the pH was increased from 5 to 9. The SnO2 nanoparticle morphology together with rGO layers was observed in the FESEM image of these samples. The absorption spectra of SnO2/rGO samples show the characteristic absorption peak of SnO2 at 296 nm, in which the band gap value of the material decreased from 4.91 eV to 4.81 eV when pH was increased from 5 to 9. The simultaneous formation of the two phases of SnO2 and rGO was demonstrated by Raman scattering spectroscopy. Photocatalytic degradation of methylene blue reached 86% after 90 min under visible light.
{"title":"One-step hydrothermal synthesis and photocatalytic activity of SnO2/rGO nanocomposites: effects of pH values","authors":"T. V. Pham","doi":"10.15625/0868-3166/15916","DOIUrl":"https://doi.org/10.15625/0868-3166/15916","url":null,"abstract":"In this study, tin oxide /reduced graphene oxide (SnO2/rGO) samples were prepared by hydrothermal method. The structural characteristics, phase composition, morphology, and size of the samples were studied by X-ray diffraction, Raman scattering spectroscopy, and scanning electron microscopy. Results showed that SnO2 nanoparticles had tetragonal rutile crystal structure with a size ranging from 4.65 nm to 5.77 nm when the pH was increased from 5 to 9. The SnO2 nanoparticle morphology together with rGO layers was observed in the FESEM image of these samples. The absorption spectra of SnO2/rGO samples show the characteristic absorption peak of SnO2 at 296 nm, in which the band gap value of the material decreased from 4.91 eV to 4.81 eV when pH was increased from 5 to 9. The simultaneous formation of the two phases of SnO2 and rGO was demonstrated by Raman scattering spectroscopy. Photocatalytic degradation of methylene blue reached 86% after 90 min under visible light.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76116803","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}
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