Applied Surface Science Advances最新文献

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Introduction to the Special Issue: Modern Methods and Avoiding Errors in Surface Analysis 特刊简介：现代方法与避免表面分析中的错误

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2024.100682

Joshua W. Pinder , Jacob D. Crossman , Braxton Kulbacki , Matthijs A. van Spronsen , Jonas Baltrusaitis , Matthew R. Linford

引用次数: 0

Enhancing thermoelectric properties of ScN films through twin domains

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2024.100674

J. More-Chevalier , U.D. Wdowik , J. Martan , T. Baba , S. Cichoň , P. Levinský , D. Legut , E. de Prado , P. Hruška , J. Pokorný , J. Bulíř , C. Beltrami , T. Mori , M. Novotný , I. Gregora , L. Fekete , L. Volfová , J. Lančok

Tailoring thermoelectric properties of ScN-based materials is of vital importance for their application, particularly at high operating temperatures. Here, we report on the thermoelectric properties of the ScN layers deposited on MgO (001) substrates by the DC reactive magnetron sputtering. The microstructure of the produced thin films is examined by X-ray diffraction and atomic force microscopy, while their chemical composition and contamination by defects are determined by X-ray photoelectron spectroscopy. The effect of temperature on the phonon properties of ScN layers, having implications for their thermoelectric properties, is explored by Raman spectroscopy. The results of our experiments are confronted with those following from the first-principles studies. We find that the ScN/MgO(001) layers with twin-domain structure reveal enhanced thermoelectric properties at elevated temperature as compared to those measured for almost defect- and domain-free layers, namely, enlarged Seebeck coefficient by about 30% and over two and a half times increased figure of merit at 800 K. Therefore, structural twin domains in thin ScN film appear to be a simple and rather stable solution for the improvement of its thermoelectric properties at elevated temperatures.

{"title":"Enhancing thermoelectric properties of ScN films through twin domains","authors":"J. More-Chevalier , U.D. Wdowik , J. Martan , T. Baba , S. Cichoň , P. Levinský , D. Legut , E. de Prado , P. Hruška , J. Pokorný , J. Bulíř , C. Beltrami , T. Mori , M. Novotný , I. Gregora , L. Fekete , L. Volfová , J. Lančok","doi":"10.1016/j.apsadv.2024.100674","DOIUrl":"10.1016/j.apsadv.2024.100674","url":null,"abstract":"<div><div>Tailoring thermoelectric properties of ScN-based materials is of vital importance for their application, particularly at high operating temperatures. Here, we report on the thermoelectric properties of the ScN layers deposited on MgO (001) substrates by the DC reactive magnetron sputtering. The microstructure of the produced thin films is examined by X-ray diffraction and atomic force microscopy, while their chemical composition and contamination by defects are determined by X-ray photoelectron spectroscopy. The effect of temperature on the phonon properties of ScN layers, having implications for their thermoelectric properties, is explored by Raman spectroscopy. The results of our experiments are confronted with those following from the first-principles studies. We find that the ScN/MgO(001) layers with twin-domain structure reveal enhanced thermoelectric properties at elevated temperature as compared to those measured for almost defect- and domain-free layers, namely, enlarged Seebeck coefficient by about 30% and over two and a half times increased figure of merit at 800 K. Therefore, structural twin domains in thin ScN film appear to be a simple and rather stable solution for the improvement of its thermoelectric properties at elevated temperatures.</div></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":"25 ","pages":"Article 100674"},"PeriodicalIF":7.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly sensitive NO2 gas sensors based on heterostructured p-rGO/n-Ga2O3 nanorods 基于异质结构 p-rGO/n-Ga2O3 纳米棒的高灵敏二氧化氮气体传感器

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2024.100679

Hsin-Ying Lee , Mu-Ju Wu , Shao-Yu Chu , Ting-Chun Chang , Yi-Feng Tung , Tsung-Han Yeh , Ching-Ting Lee

In this study, using a sensing membrane composed of p-type reduced graphene oxide (rGO)-decorated hydrothermally synthesized n-type gallium oxide (Ga₂O₃) nanorods, nitrogen dioxide (NO₂) gas sensors were successfully fabricated. The characteristics of the rGO-decorated Ga₂O₃ nanorods were analyzed by X-ray photoelectron spectroscopy (XPS). The experimental results indicated that the rGO decoration on the surface of the Ga₂O₃ nanorods increased the amount of gas adsorption sites and oxygen vacancies, thereby enhancing electrical conductivity. Consequently, compared to NO₂ gas sensors utilizing only Ga₂O₃ nanorods, the NO₂ gas sensors using rGO-decorated Ga₂O₃ nanorod sensing membrane exhibited lower resistance, reduced activation energy, and higher response. Optimal response, reaching 51.14, was achieved by decorating with 15 mg of rGO. Additionally, the response and recovery times of the NO₂ gas sensors were shortened with an increase in the amount of rGO decoration on the Ga₂O₃ nanorods. This improvement could be attributed to the trend of lower activation energy associated with an increased amount of rGO decoration. This study demonstrates the efficacy of rGO decoration in improving the performance of Ga₂O₃ nanorod-based NO₂ gas sensors.

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引用次数: 0

One-step mass-production of CeO2 nanoparticles embedded in free-standing porous carbon as haloperoxidase mimetic coating to combat biofouling on steel surface

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2024.100670

Chao Zhao , Xinyu Wu , Tianqi Cheng , Tsz Yeung Yip , Bo Yuan , Wanqing Dai , Shengpei Zhang , Yuwei Qiu , Jian Lin Chen , Shang-Wei Chou , Yung-Kang Peng

Marine biofouling poses significant challenges for maritime industries, leading to increased maintenance costs and ecological disturbances. While Cu-based biocide coatings are effective in combating biofouling, they raise environmental concerns and have limited lifespans. This has spurred interest in sustainable alternatives inspired by marine organisms, such as haloperoxidases (HPOs) found in certain algae, which can convert H₂O₂ and Br⁻ in seawater into HOBr to mitigate biofouling. However, the practical implementation of HPOs is limited by their stability and cost. Nanozymes like CeO₂ have emerged as promising alternatives; however, conventional coating methods—typically involving the replacement of Cu-based biocides with CeO₂ nanoparticles (NPs) in resin—restrict their exposure to H₂O₂ and Br⁻, resulting in significant activity loss. This study presents a simple method for mass-producing CeO₂ NPs embedded in free-standing porous carbon as HPO mimetics. The optimized sample demonstrates exceptional HPO-like activity and antibacterial performance. Most importantly, we have shown that these HPO mimetics can be directly grown on steel surfaces during preparation, eliminating the need for a dispersant. This direct coating technique effectively addresses the challenges associated with conventional resin method, facilitating the development of a sustainable antibacterial and antifouling coating with preserved activity.

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引用次数: 0

Novel source/drain contact structure for a-IGZO devices: Oxygen-scavenger-layer metal-interlayer-semiconductor (OSL MIS) approach

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2024.100676

Sungjoo Song , Jong-Hyun Kim , Jongyoun Park , Seung-Hwan Kim , Dongjin Ko , Hyejung Choi , Seiyon Kim , Hyun-Yong Yu

The engineering of Schottky barrier height (SBH) at source/drain (S/D) contacts is a crucial technology in the next generation nanoelectronics. Recently, amorphous indium gallium zinc oxide (a-IGZO) has gained prominence for its application to stackable 3-dimensional (3D) dynamic random-access memory (DRAM) due to its ultra-low off-current and low-temperature fabrication. However, a high contact resistance of a-IGZO still limits the device performance. Despite various attempts to address the high contact resistance issue, including the metal-interlayer-semiconductor (MIS) contact structure, a novel approach is needed. Here, we propose an oxygen-scavenger-layer MIS (OSL MIS) contact structure which employs oxygen areal density (OAD) modulated OSL as the interlayer. The OSL MIS has been shown to improve the contact resistance through three key effects. 1) The interlayer doping effect, 2) a diffusion of oxygen ions from a-IGZO to interlayer, generates shallow donors in a-IGZO, and 3) the movement of oxygen ion induces the interface dipole. With these effects, the effective SBH and a contact resistivity were reduced to 0.119 eV and 1.36E-5 Ω·cm^2, respectively. The proposed OSL MIS contact structure of a-IGZO using OAD modulation technique, shows enormous potential in improving the performance of amorphous oxide semiconductor based advanced electronic devices.

{"title":"Novel source/drain contact structure for a-IGZO devices: Oxygen-scavenger-layer metal-interlayer-semiconductor (OSL MIS) approach","authors":"Sungjoo Song , Jong-Hyun Kim , Jongyoun Park , Seung-Hwan Kim , Dongjin Ko , Hyejung Choi , Seiyon Kim , Hyun-Yong Yu","doi":"10.1016/j.apsadv.2024.100676","DOIUrl":"10.1016/j.apsadv.2024.100676","url":null,"abstract":"<div><div>The engineering of Schottky barrier height (SBH) at source/drain (S/D) contacts is a crucial technology in the next generation nanoelectronics. Recently, amorphous indium gallium zinc oxide (a-IGZO) has gained prominence for its application to stackable 3-dimensional (3D) dynamic random-access memory (DRAM) due to its ultra-low off-current and low-temperature fabrication. However, a high contact resistance of a-IGZO still limits the device performance. Despite various attempts to address the high contact resistance issue, including the metal-interlayer-semiconductor (MIS) contact structure, a novel approach is needed. Here, we propose an oxygen-scavenger-layer MIS (OSL MIS) contact structure which employs oxygen areal density (OAD) modulated OSL as the interlayer. The OSL MIS has been shown to improve the contact resistance through three key effects. 1) The interlayer doping effect, 2) a diffusion of oxygen ions from a-IGZO to interlayer, generates shallow donors in a-IGZO, and 3) the movement of oxygen ion induces the interface dipole. With these effects, the effective SBH and a contact resistivity were reduced to 0.119 eV and 1.36E-5 Ω·cm<sup>2,</sup> respectively. The proposed OSL MIS contact structure of a-IGZO using OAD modulation technique, shows enormous potential in improving the performance of amorphous oxide semiconductor based advanced electronic devices.</div></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":"25 ","pages":"Article 100676"},"PeriodicalIF":7.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced Stability of Gr, h-BN and Gr/h-BN protected MoS2 flakes under laser illumination

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2024.100687

Chak-Ming Liu , Sheng-Yu Hsu , Hsin-Sung Chen , Chuan-Che Hsu , Yann-Wen Lan , Hsiang-Chih Chiu , Wen-Chin Lin

The optical excitation and applications of molybdenum disulfide (MoS₂) is critical due to its limited thickness and susceptibility to damage from high-intensity laser illumination, which can cause significant local heating and structural degradation. To mitigate this issue, protective layers made from materials with high thermal conductivity and transparency, such as graphene (Gr), hexagonal boron nitride (h-BN), and Gr/h-BN heterostructure, have been explored. This study utilizes Raman and photoluminescence (PL) spectroscopy to assess the stability of both bare MoS₂ flakes and MoS₂ flakes covered with different protecting layers under varying laser power levels. When exposed to 13 mW/μm² laser for 30 min, bare MoS₂ undergoes considerable structural degradation, characterized by the formation of protrusions and a reduction in the Raman signal to just 10 % of its original intensity. In contrast, the Gr/MoS₂ heterostructure maintains the stability of both the Raman fingerprint peaks and PL intensity, with only a 0–15 % decrease. The h-BN/MoS₂ system also shows improved stability, with the Raman signal decreasing to around 30 % of its initial intensity. Gr/h-BN/MoS₂ exhibits similar stability to Gr/MoS₂. These findings indicate that the Gr/MoS₂ system provides the highest stability under laser illumination, followed by the Gr/h-BN/MoS₂ system and the h-BN/MoS₂ system, while bare MoS₂ demonstrates the lowest stability. The combined effects of efficient thermal dissipation and isolation from ambient oxygen offer significant protection to MoS₂ under high-power illumination.

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引用次数: 0

Dependency of solid particle erosion behaviour of plasma sprayed NiTi coating on primary gas flow rate

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2024.100681

B. Swain , S. Mantry , S.S. Mohapatra , P. Mallick , A. Behera

Solid particle erosion is a major concern for the current generation aerospace industries. To reduce the effect of solid particle erosion on the aerospace engine parts, an NiTi coating has been developed by atmospheric plasma spray technology in the current investigation. Furthermore, the dependency of the solid particle erosion property on the primary gas flow rate of plasma spray coating has also been investigated. For this purpose, plasma spray coatings of NiTi alloy have been developed at different primary gas flow rates and various physical and mechanical properties have been evaluated. A correlation between the physical and mechanical properties of the coating with the solid particle erosion wear has been performed. Various phases have been obtained from the X-ray diffraction analysis such as NiTi-B2, Ni, Ti, Ni₃Ti, Ti₂Ni, NiO, TiO and Ni₄Ti₃, which also have been confirmed by energy dispersive spectroscopy method. From the microstructural investigation, various surface and interface defects such as unmelted particle formation, pores, microcracks, splat delamination etc. have been observed at the coatings developed at low primary gas flow rate and homogeneous splats have been observed from the coatings developed at higher primary gas flow rate. The coating developed at 40 lpm primary gas flow rate revealed the optimum properties like adhesion strength, microhardness, porosity, surface roughness etc. Erosion rate of the plasma sprayed NiTi coatings has been affected significantly by the coating's physical and mechanical properties. It has been revealed from the current investigation that the coating obtained from 40 lpm primary gas flow rate has less erosion rate as compared to others. Various erosion mechanisms such as groove formation, scratches, cutting, plastic deformation etc. has been observed from the microstructural analysis of the eroded samples at 45˚ impingement angle and splat fragmentation, splat delamination form the 90˚ impingement angle.

{"title":"Dependency of solid particle erosion behaviour of plasma sprayed NiTi coating on primary gas flow rate","authors":"B. Swain , S. Mantry , S.S. Mohapatra , P. Mallick , A. Behera","doi":"10.1016/j.apsadv.2024.100681","DOIUrl":"10.1016/j.apsadv.2024.100681","url":null,"abstract":"<div><div>Solid particle erosion is a major concern for the current generation aerospace industries. To reduce the effect of solid particle erosion on the aerospace engine parts, an NiTi coating has been developed by atmospheric plasma spray technology in the current investigation. Furthermore, the dependency of the solid particle erosion property on the primary gas flow rate of plasma spray coating has also been investigated. For this purpose, plasma spray coatings of NiTi alloy have been developed at different primary gas flow rates and various physical and mechanical properties have been evaluated. A correlation between the physical and mechanical properties of the coating with the solid particle erosion wear has been performed. Various phases have been obtained from the X-ray diffraction analysis such as NiTi-B2, Ni, Ti, Ni<sub>3</sub>Ti, Ti<sub>2</sub>Ni, NiO, TiO and Ni<sub>4</sub>Ti<sub>3</sub>, which also have been confirmed by energy dispersive spectroscopy method. From the microstructural investigation, various surface and interface defects such as unmelted particle formation, pores, microcracks, splat delamination etc. have been observed at the coatings developed at low primary gas flow rate and homogeneous splats have been observed from the coatings developed at higher primary gas flow rate. The coating developed at 40 lpm primary gas flow rate revealed the optimum properties like adhesion strength, microhardness, porosity, surface roughness etc. Erosion rate of the plasma sprayed NiTi coatings has been affected significantly by the coating's physical and mechanical properties. It has been revealed from the current investigation that the coating obtained from 40 lpm primary gas flow rate has less erosion rate as compared to others. Various erosion mechanisms such as groove formation, scratches, cutting, plastic deformation etc. has been observed from the microstructural analysis of the eroded samples at 45˚ impingement angle and splat fragmentation, splat delamination form the 90˚ impingement angle.</div></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":"25 ","pages":"Article 100681"},"PeriodicalIF":7.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of fiber engraving laser on metallurgical, surface topography, and corrosion properties of AZ80 magnesium-based alloy

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2025.100695

Narges Ahmadi , Homam Naffakh-Moosavy , Seyed Mohammad Mahdi Hadavi , Fatemeh Bagheri

Surface modification with fiber lasers improves the biological and mechanical properties of biomaterials. Magnesium, a lightweight metal similar to natural bone, shows no toxicity and can aid in hard tissue recovery when implanted in the human body. However, its main drawback is its fast degradation rate in medical applications. Current research aims to study the effect of fiber lasers on the surface properties, metallurgical characteristics, and corrosion behavior of AZ80 magnesium-based alloy. The XRD and hardness test findings from the laser process show that some secondary phases have dissolved in the matrix, while others remain unchanged. The microhardness result for sample 4 indicated an increase to 120 HV with a loading force of 9.8 N at a holding time of 10 s. The roughness test showed a decrease from 10±0.54 µm for the AZ80 sample to 3.27±0.45 µm for sample 5. The results of the wettability test showed that the water contact angle increased from 55.1 ± 1.5° for AZ80 to 129 ± 4.3° for sample 3. The results of the polarization test showed changes in Ecorr from -1.55 mV to -1.63 mV and a shift in Icorr from 0.26 mA/cm² to 0.16 mA/cm². Sample 3 had three times higher resistance (R2 = 1710 Ω.cm²) compared to the laser-treated samples and AZ80 (R2 = 540.1 Ω.cm²). Laser-treated samples showed lower corrosion rates than untreated samples, thanks to a more uniform melted surface layer, lower roughness, and higher water contact angle. This method could enhance the corrosion resistance of the Mg-based AZ80 alloy in biomedical applications.

{"title":"Effects of fiber engraving laser on metallurgical, surface topography, and corrosion properties of AZ80 magnesium-based alloy","authors":"Narges Ahmadi , Homam Naffakh-Moosavy , Seyed Mohammad Mahdi Hadavi , Fatemeh Bagheri","doi":"10.1016/j.apsadv.2025.100695","DOIUrl":"10.1016/j.apsadv.2025.100695","url":null,"abstract":"<div><div>Surface modification with fiber lasers improves the biological and mechanical properties of biomaterials. Magnesium, a lightweight metal similar to natural bone, shows no toxicity and can aid in hard tissue recovery when implanted in the human body. However, its main drawback is its fast degradation rate in medical applications. Current research aims to study the effect of fiber lasers on the surface properties, metallurgical characteristics, and corrosion behavior of AZ80 magnesium-based alloy. The XRD and hardness test findings from the laser process show that some secondary phases have dissolved in the matrix, while others remain unchanged. The microhardness result for sample 4 indicated an increase to 120 HV with a loading force of 9.8 N at a holding time of 10 s. The roughness test showed a decrease from 10±0.54 µm for the AZ80 sample to 3.27±0.45 µm for sample 5. The results of the wettability test showed that the water contact angle increased from 55.1 ± 1.5° for AZ80 to 129 ± 4.3° for sample 3. The results of the polarization test showed changes in Ecorr from -1.55 mV to -1.63 mV and a shift in Icorr from 0.26 mA/cm² to 0.16 mA/cm². Sample 3 had three times higher resistance (R2 = 1710 Ω.cm²) compared to the laser-treated samples and AZ80 (R2 = 540.1 Ω.cm²). Laser-treated samples showed lower corrosion rates than untreated samples, thanks to a more uniform melted surface layer, lower roughness, and higher water contact angle. This method could enhance the corrosion resistance of the Mg-based AZ80 alloy in biomedical applications.</div></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":"25 ","pages":"Article 100695"},"PeriodicalIF":7.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comparative study on spin-to-charge and charge-to-spin conversion using modulated Dirac surface states of Bi2Se3 利用 Bi2Se3 的调制狄拉克表面态进行自旋到电荷和电荷到自旋转换的比较研究

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2025.100693

Youngmin Lee , Jonghoon Kim , Seungwon Rho , Seok-Bo Hong , Hyeongmun Kim , Jaehan Park , Dajung Kim , Chul Kang , Myung-Ho Bae , Mann-Ho Cho

Understanding the mechanisms of spin-charge interconversion is a major challenge in modern spintronics. In this study, we investigate the complex charge-to-spin conversion (CSC) and spin-to-charge conversion (SCC) using the modulated Dirac surface state of Bi₂Se₃ thin films. The role of Bi₂Se₃, which possesses a spin-momentum locked Dirac surface state (DSS), in the CSC and SCC processes is explored using spin-torque ferromagnetic resonance (ST-FMR) and terahertz emission methods, respectively. Distinct differences in spin Hall angles are observed in ultrathin Bi₂Se₃ films on HfO_2-x, compared to those on a typical substrate, indicating the dependence on the spin-orbit interaction. Specifically, the interaction of d-orbital of the unbound hafnium in HfO_2-x and Bi₂Se₃ enhances the spin-orbit interaction. In addition, we found that the complex interaction between the surface and bulk states affects the spin diffusion length and the spin current injection region. The influence of the surface state on the conversion processes decreases as the Bi₂Se₃ film thickness increases, resulting in differing efficiency for SCC and CSC due to the asymmetrical stack structure. The findings using Bi₂Se₃ ultrathin films enhance our understanding of DSS-related CSC and SCC mechanisms, paving the way for performance optimization of future spintronic devices.

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引用次数: 0

Atmospheric pressure plasma synthesis of adaptable coatings based on castor oil urethane dimethacrylate and their properties 基于蓖麻油聚氨酯二甲基丙烯酸酯的常压等离子合成可适应涂料及其性能

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.apsadv.2024.100680

Eusebiu-Rosini Ionita , Maria-Daniela Ionita , Antoniu Moldovan , Cristina Surdu-Bob , Violeta Melinte , Andreea L. Chibac-Scutaru , Andrada Lazea-Stoyanova

Urethane-dimethacrylate polymers are generated using light energy, in the presence of photoinitiators, and are the choice materials for many composite materials, biomaterials, optical materials or coatings. In this study, we present an alternative, new, synthesis method for castor oil polymethacrylate (CO-PMA) films by exposure of a liquid precursor (namely castor oil urethane dimethacrylate (CO-UDMA)) to a non-thermal atmospheric pressure cylindrical plasma source. This is a photoinitiator free process, an open-air atmosphere technique and uses a single plasma polymerization step. We have obtained polymeric layers in two modes, in stationary or dynamic plasma exposure mode. The experimental results show that our plasma method is suitable to generate compact polymeric layers, with no trapped unpolymerized precursor, showing a bumpy or microscale ripples surface appearance. However, the surface and cross-section analyses indicate that the dynamic layer has a nanometric flat surface, a more pronounced hydrophobic character and is thicker. In short, our plasma-based method for generation of CO-PMA layers, in dynamic mode, does not require toxic photoinitiators, is simple, can be applied to temperature-sensitive materials and is scalable to large areas.

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引用次数: 0

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