Physica B-condensed Matter最新文献_第5页

The magnetic properties in two-dimensional Cr2X2Y6 (X=Ge, Si; Y=Te, Se) modulated by strain and electric field 二维 Cr2X2Y6（X=Ge、Si；Y=Te、Se）中受应变和电场调制的磁性能

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416721

Weiyang Yu , Yuling Zhang , Wen Luo , Xiaoli Zhang , Yali Wu , Rui Li , Wei-Bing Zhang

{"title":"The magnetic properties in two-dimensional Cr2X2Y6 (X=Ge, Si; Y=Te, Se) modulated by strain and electric field","authors":"Weiyang Yu , Yuling Zhang , Wen Luo , Xiaoli Zhang , Yali Wu , Rui Li , Wei-Bing Zhang","doi":"10.1016/j.physb.2024.416721","DOIUrl":"10.1016/j.physb.2024.416721","url":null,"abstract":"<div><div>Nowadays, electronic devices based on spin properties have rapidly developed, which played an important role in the field of efficient information storage and transmission. In this work, the geometric structures and magnetic properties of two-dimensional (2D) monolayer Cr<sub>2</sub>X<sub>2</sub>Y<sub>6</sub> (X = Ge, Si; Y=Se, Te) have been investigated systematically. Especially, a comparative study on the geometric structures, electronic structures, magnetic anisotropy and Curie temperature (<em>T</em><sub>c</sub>) of 2D Cr<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub> (CGT), Cr<sub>2</sub>Si<sub>2</sub>Se<sub>6</sub> (CSS) and Cr<sub>2</sub>Si<sub>2</sub>Te<sub>6</sub> (CST) have been studied. The magnetic ground state of monolayer CGT, CST and CSS is FM with out-of-plane magnetic anisotropy. The results show that CGT, CST and CSS are all semiconductors, and the band gaps with spin up (down) of CGT, CSS and CST are 0.21eV (0.68eV), 0.10eV (0.45eV), and 0.19eV (1.14eV), respectively. The <em>T</em><sub>c</sub> of monolayer CGT, CSS and CST are 61, 39 and 91 K based on mean field theory, which are 55, 34 and 78 K by Monte Carlo simulation. By applying biaxial strains, the band gap of monolayer CGT, CST and CSS increases firstly and then decreases under tensile strain, and the magnetic anisotropy changes greatly under compression strain. By employing vertical electric field, the results show that CST changes from semiconductor to semi-metal under the electric field of 0.8 V/Å, while CGT and CSS change little. The results provide theoretical basis for the development of novel spintronic devices and flexible electronic devices in future applications.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416721"},"PeriodicalIF":2.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A comprehensive study of cytosine-ZnO interactions: Theoretical and experimental insights 细胞核-氧化锌相互作用的综合研究：理论与实验见解

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416732

Niyazi Bulut , Serhat Keser , Alexandre Zanchet , Piotr S. Zuchowski , Tankut Ates , İrfan Kilic , Omer Kaygili

{"title":"A comprehensive study of cytosine-ZnO interactions: Theoretical and experimental insights","authors":"Niyazi Bulut , Serhat Keser , Alexandre Zanchet , Piotr S. Zuchowski , Tankut Ates , İrfan Kilic , Omer Kaygili","doi":"10.1016/j.physb.2024.416732","DOIUrl":"10.1016/j.physb.2024.416732","url":null,"abstract":"<div><div>This paper presents a comprehensive investigation of the adsorption of cytosine, a DNA base, on ZnO model clusters, specifically Zn<sub>2</sub>O<sub>2</sub>, Zn<sub>3</sub>O<sub>3</sub>, Zn<sub>4</sub>O<sub>4</sub>, Zn<sub>6</sub>O<sub>6</sub>, Zn<sub>8</sub>O<sub>8</sub> ring (R) and cubic rocksalt. A density functional theory (DFT) method was used to simulate the adsorption of cytosine on ZnO (C/ZnO) clusters. The B3LYP/LanL2DZ method, which includes a correction for the dispersion contribution, was used. The calculated energy gap (Eg) for cytosine showed a strong dependence on the cluster size, highlighting variations corresponding to the dimensions of the clusters. The proposed physisorption mechanism involves the formation of an N...Zn bond between cytosine and the active Zn site on ZnO. In addition, experimental data, including microscopic and spectroscopic evidence, were integrated to further elucidate the interactions between cytosine and ZnO. A composite of C and ZnO was prepared by the wet chemical method and characterised by SEM, XRD and FT-IR analyses. The interaction of cytosine with ZnO nanoparticles was observed by UV–vis spectroscopy. The experimental results were then compared with those obtained from DFT calculations, taking into account the new insights into the cytosine-ZnO interactions. This comparison provided a holistic understanding of the system.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416732"},"PeriodicalIF":2.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Dynamic magnetic properties of core-shell nanoparticles in an oscillating magnetic field 振荡磁场中核壳纳米粒子的动态磁特性

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416707

Zhen-yu Liu , Wei Wang , Dan Lv , Yu-hang Tu

引用次数: 0

The effect of guanidinium tetrafluoroborate surface passivation on the stability of 2D-PEA2SnI4 perovskite thin films prepared by sequential physical vapor deposition 四氟硼酸胍表面钝化对顺序物理气相沉积法制备的二维-PEA2SnI4 包晶薄膜稳定性的影响

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416735

Alex Sembito , Julius M. Mwabora , Francis W. Nyongesa , Mmantsae Diale

{"title":"The effect of guanidinium tetrafluoroborate surface passivation on the stability of 2D-PEA2SnI4 perovskite thin films prepared by sequential physical vapor deposition","authors":"Alex Sembito , Julius M. Mwabora , Francis W. Nyongesa , Mmantsae Diale","doi":"10.1016/j.physb.2024.416735","DOIUrl":"10.1016/j.physb.2024.416735","url":null,"abstract":"<div><div>2D-PEA<sub>2</sub>SnI<sub>4</sub> perovskites thin films were prepared by sequential physical vapor deposition (SPVD), and passivated in vacuum using guanidinium tetrafluoroborate (GuaBF<sub>4</sub>). The effect of GuaBF<sub>4</sub> on stability, optical, morphological, electrical, and structural properties of PEA<sub>2</sub>SnI<sub>4</sub> films was investigated. The introduction of GuaBF<sub>4</sub> improved the film morphology and crystallinity with the resulting films exhibiting enlarged grain sizes and low surface roughness. Raman and FTIR results showed that GuaBF<sub>4</sub> did not change the structural phase and the functional group of the perovskite, but rather confirmed an additive-perovskite interaction. PL and carrier lifetime measurements revealed a 1.8 and 2-folds increment in intensity and lifetime respectively, attributed to suppression of non-radiative recombination in GuaBF<sub>4</sub> treated films. XRD, UV–Vis and FE-SEM stability studies showed that GuaBF<sub>4</sub> treatment significantly improved the stability of the films. This study suggests an effective strategy for deposition of solvent-free additive based 2D-Sn perovskite high quality films that are stable and reproducible.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416735"},"PeriodicalIF":2.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Frequency and voltage dependent of electrical and dielectric properties of Ag/GO doped NiO/p-Si/Al MOS structures under darkness and light 掺杂 Ag/GO 的 NiO/p-Si/Al MOS 结构在黑暗和光照下的电气和介电特性与频率和电压有关

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416720

Halil ÖZERLİ

{"title":"Frequency and voltage dependent of electrical and dielectric properties of Ag/GO doped NiO/p-Si/Al MOS structures under darkness and light","authors":"Halil ÖZERLİ","doi":"10.1016/j.physb.2024.416720","DOIUrl":"10.1016/j.physb.2024.416720","url":null,"abstract":"<div><div>At studying, we searched the frequency and voltage dependency of the electrical and dielectric traits of a nano-made NiO-contributed GO thin film enlarged on a p-type silicon substrate using sol-gel technique. The electrical and dielectric features of Ag/GO-NiO/p-Si were investigated by capacitance–voltage (C–V) and conductance–voltage (G/ <span><math><mrow><mi>ω</mi></mrow></math></span>–V) indications in the frequency interval of 10 kHz–1000 kHz below dark and illumination at ambient temperature. While the capacitance and series resistance (Rs) values decrease with increment of frequency and increment trend in conductance was observed with the increasement of frequency. These decrement/increment trend observed at greater frequencies are attributed to existence of interface state densities. After, the frequency dependence of dielectric constant (<em>εʼ)</em>, dielectric loss (<em>εʼʼ),</em> loss tangent (tan<em>δ)</em>, ac electrical conductivity (σ<sub>ac</sub>) and complex impedance (Z∗) of Ag/GO-NiO/p-Si structures were investigated in the frequency by means of the capacitance–voltage (C–V) and conductance-voltage (G/w-V) indications. The experimental findings showed that εʼ, εʼʼ and σ<sub>ac</sub> were strongly frequency dependent.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416720"},"PeriodicalIF":2.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Enhanced thermoelectric properties in Cu₁.₈Se thin films: Achieving superior power factor through phase control and optimal deposition temperature 增强铜₁.₈硒薄膜的热电特性：通过相位控制和最佳沉积温度实现优异的功率因数

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416727

Hassan Ahmoum , Guojian Li , Youssef Mir , Qiang Wang

引用次数: 0

Influence of bismuth content on the properties of glass-ceramics with composition xBi2O3-(0.40-x)B2O3-0.15ZnO-0.45P2O5: Synthesis, structural, thermal analysis, and dielectric relaxation process 铋含量对成分为 xBi2O3-(0.40-x)B2O3-0.15ZnO-0.45P2O5 的玻璃陶瓷特性的影响：合成、结构、热分析和介电弛豫过程

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416728

Dipankar Biswas , Debtanu Patra , Souvik Brahma Hota , Ashok Das , Nipu Modak , Rittwick Mondal , Soumyajyoti Kabi

{"title":"Influence of bismuth content on the properties of glass-ceramics with composition xBi2O3-(0.40-x)B2O3-0.15ZnO-0.45P2O5: Synthesis, structural, thermal analysis, and dielectric relaxation process","authors":"Dipankar Biswas , Debtanu Patra , Souvik Brahma Hota , Ashok Das , Nipu Modak , Rittwick Mondal , Soumyajyoti Kabi","doi":"10.1016/j.physb.2024.416728","DOIUrl":"10.1016/j.physb.2024.416728","url":null,"abstract":"<div><div>The glass-ceramics materials with the sample composition of xBi<sub>2</sub>O<sub>3</sub>-(0.40-x) B<sub>2</sub>O<sub>3</sub>-0.15ZnO-0.45P<sub>2</sub>O<sub>5</sub> (BBZP) (where x = 0.10, 0.15, 0.20, and 0.25) have been prepared using the conventional melt-quenching technique. Different nanocrystalline phases embedded inside the glass-ceramic matrix have been characterised by analysing x-ray diffraction spectra. The obtained density values as well as molar volume increases with the rise of bismuth content. The network structure of the glass ceramic samples has been investigated employing Raman spectroscopy. The DSC analysis reveals the decrease in Glass transition temperature (T<sub>g</sub>) (433K–416K), and crystallisation temperature (T<sub>c</sub>) (569K–556K) of the studied materials. The electrical properties of the samples have been investigated in the context of dielectric and modulus formalism. Different theoretical models have been employed to analyse the experimental data of dielectric and modulus spectra. The Nyquist plots of the materials have also been analyzed employing relevant models. It has been shown that the higher bismuth containing samples are highly dense with high thermal stability. Such materials also have high dielectric strength. Analysis of these performance indicators suggests the possible applications of these materials in electrochemical devices.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416728"},"PeriodicalIF":2.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Temperature sensing properties of dual-laser excited Y2O3:Yb3+/Er3+/Tm3+ fluorescent crystals 双激光激发 Y2O3:Yb3+/Er3+/Tm3+ 荧光晶体的温度传感特性

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416729

Yong Tang , Qiuyue Ran

引用次数: 0

Preparation of amorphous TiO2 films by RF magnetron sputtering: Process optimization and effect of sputtering pressure on electrochromic properties 用射频磁控溅射法制备非晶态二氧化钛薄膜：工艺优化和溅射压力对电致变色特性的影响

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416726

Lan Zhang, Hewei Liu, Hongye Chen, Yunlong Chen, Na Li, Cong Tan, Huizhong Ma

{"title":"Preparation of amorphous TiO2 films by RF magnetron sputtering: Process optimization and effect of sputtering pressure on electrochromic properties","authors":"Lan Zhang, Hewei Liu, Hongye Chen, Yunlong Chen, Na Li, Cong Tan, Huizhong Ma","doi":"10.1016/j.physb.2024.416726","DOIUrl":"10.1016/j.physb.2024.416726","url":null,"abstract":"<div><div>In this study, radio frequency (RF) magnetron sputtering was utilized to fabricate Titanium dioxide (TiO<sub>2</sub>) thin films at a room temperature. Scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, atomic force microscopy, X-ray photoelectron spectroscopy, electrochemical workstation, and UV–Vis spectrophotometry were employed to analyze and characterize the microstructure, compositional components, and electrochromic properties of the films. The main focus is on exploring the microstructure and electrochromic properties of films produced under diverse sputtering pressures. The results show that the TiO<sub>2</sub> films fabricated at a sputtering pressure of 1.2 Pa exhibit the most desirable surface morphology, with an optical modulation amplitude of up to 49.18 % (@550 nm), coloring time of 1.28 s, bleaching time of 0.79 s, and a coloration efficiency of 21.07 cm<sup>2</sup>/C. After 1000 cyclic voltammetry tests, the Q decay rate is 51.75 %. Electrochemical impedance spectroscopy (EIS) measurements reveal that TiO<sub>2</sub> films prepared under these process parameters have lower charge transfer resistance and ion diffusion impedance, which facilitate ion injection and extraction.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416726"},"PeriodicalIF":2.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Molecular dynamics simulation of temperature and defect-induced change of the mechanical properties of PBCF-graphene nanosheet 温度和缺陷诱导 PBCF 石墨烯纳米片力学性能变化的分子动力学模拟

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-11-12 DOI: 10.1016/j.physb.2024.416722

Yuman Li , Guichao Liu , Li-Cai Zhao

{"title":"Molecular dynamics simulation of temperature and defect-induced change of the mechanical properties of PBCF-graphene nanosheet","authors":"Yuman Li , Guichao Liu , Li-Cai Zhao","doi":"10.1016/j.physb.2024.416722","DOIUrl":"10.1016/j.physb.2024.416722","url":null,"abstract":"<div><div>This study employs Molecular Dynamics (MD) simulations to investigate the mechanical properties of a Poly-Butadiene-Cyclooctatetraene-Framework (PBCF) graphene nanosheet, a two-dimensional sp<sup>2</sup> hybridized honeycomb carbon allotrope. The simulations considered the effects of temperature and defects on the nanosheets' behavior. The mechanical properties examined include the stress-strain behavior, Young's modulus, ultimate stress, as well as stress distribution within nanosheet prior to final fracture during tensile loading. PCBF-graphene nanosheets have a Young's modulus of 841.76 GPa (armchair) and 753.15 GPa (zigzag), with higher stiffness in the armchair orientation. The material behaves brittle in the zigzag direction and ductile in the armchair, highlighting its anisotropic mechanical properties. Temperature significantly impacts mechanical properties, with both Young's modulus and ultimate stress decreasing as temperature rises. Zigzag nanosheets are more sensitive to these changes. Initially, the armchair PBCF-graphene nanosheet has higher Young's modulus, but at elevated temperatures, the zigzag nanosheet surpasses it.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"698 ","pages":"Article 416722"},"PeriodicalIF":2.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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