Pub Date : 2025-02-18DOI: 10.1016/j.apsusc.2025.162715
Chaocheng Ma , Zhengfeng Xie , Junming Miao , Wei Shi , Songsong Xue
A novel organic nano-silicon material (NPs-SM) was synthesized by Mannich reaction using acetophenone, formaldehyde and amino silicon nanoparticles (Si NPs), which was prepared by KH550 and ascorbic acid through a simple one-step procedure. NPs-SM was characterized by FT-IR, XPS, SEM-EDS and TEM and studied of its slow-release performance. The inhibition efficiency was investigated with electrochemical impedance spectroscopy, potentiodynamic measurements, and mass loss analysis, respectively. Additionally, SEM, XPS, AFM and CA analyses were carried out to study the relationship between structural details and surficial performance of the protective layer formed on the steel. Intriguingly, the corrosion inhibition efficiency of NPs-SM significantly increases with increasing temperature in strong acid environments, reaching 94.94 %. This precisely matches the characteristics required for high-temperature and high acid corrosion inhibitors, this study is expected to provide new ideas for corrosion research under special conditions.
{"title":"Preparation of novel silica mannich base nanoparticles and corrosion inhibition properties on N80 steel under high acidic conditions","authors":"Chaocheng Ma , Zhengfeng Xie , Junming Miao , Wei Shi , Songsong Xue","doi":"10.1016/j.apsusc.2025.162715","DOIUrl":"10.1016/j.apsusc.2025.162715","url":null,"abstract":"<div><div>A novel organic nano-silicon material (NPs-SM) was synthesized by Mannich reaction using acetophenone, formaldehyde and amino silicon nanoparticles (Si NPs), which was prepared by KH550 and ascorbic acid through a simple one-step procedure. NPs-SM was characterized by FT-IR, XPS, SEM-EDS and TEM and studied of its slow-release performance. The inhibition efficiency was investigated with electrochemical impedance spectroscopy, potentiodynamic measurements, and mass loss analysis, respectively. Additionally, SEM, XPS, AFM and CA analyses were carried out to study the relationship between structural details and surficial performance of the protective layer formed on the steel. Intriguingly, the corrosion inhibition efficiency of NPs-SM significantly increases with increasing temperature in strong acid environments, reaching 94.94 %. This precisely matches the characteristics required for high-temperature and high acid corrosion inhibitors, this study is expected to provide new ideas for corrosion research under special conditions.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"692 ","pages":"Article 162715"},"PeriodicalIF":6.3,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-18DOI: 10.1016/j.apsusc.2025.162724
Zhuoyang Lou, Ling Du, Qi Liao, Ni Qin, Dinghua Bao
In this study, Mn-doped CoFe2O4 thin films were prepared by a sol–gel spin-coating method on Pt/Ti/SiO2/Si substrates for resistive memory application. It was confirmed that Mn ions were doped into Co ion sites. The MnxCo1-xFe2O4 thin films with Pt top and bottom electrodes have good resistive switching (RS) properties, such as relatively low forming voltage distribution and narrow Set/Reset voltage distribution, good cycling durability and time retention, especially when Mn doping content x is 0.15. The conduction mechanisms are ohmic behavior in the low-resistance state and Schottky emission in the high-field region in the high-resistance state. The RS mechanism can be explained through formation and fracture of oxygen vacancy filaments. The saturation magnetization strength of manganese-cobalt ferrite films is increased after electro-forming process compared to the Fresh state, which is attributed to the change in oxygen vacancy concentration. This work demonstrates the potential of Mn-doped CoFe2O4 films to be used in resistive random access memory.
{"title":"Doping Mn ions at Co sites to improve resistive switching property of inverse spinel CoFe2O4 resistive random access memory devices","authors":"Zhuoyang Lou, Ling Du, Qi Liao, Ni Qin, Dinghua Bao","doi":"10.1016/j.apsusc.2025.162724","DOIUrl":"10.1016/j.apsusc.2025.162724","url":null,"abstract":"<div><div>In this study, Mn-doped CoFe<sub>2</sub>O<sub>4</sub> thin films were prepared by a sol–gel spin-coating method on Pt/Ti/SiO<sub>2</sub>/Si substrates for resistive memory application. It was confirmed that Mn ions were doped into Co ion sites. The Mn<sub>x</sub>Co<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub> thin films with Pt top and bottom electrodes have good resistive switching (RS) properties, such as relatively low forming voltage distribution and narrow Set/Reset voltage distribution, good cycling durability and time retention, especially when Mn doping content x is 0.15. The conduction mechanisms are ohmic behavior in the low-resistance state and Schottky emission in the high-field region in the high-resistance state. The RS mechanism can be explained through formation and fracture of oxygen vacancy filaments. The saturation magnetization strength of manganese-cobalt ferrite films is increased after electro-forming process compared to the Fresh state, which is attributed to the change in oxygen vacancy concentration. This work demonstrates the potential of Mn-doped CoFe<sub>2</sub>O<sub>4</sub> films to be used in resistive random access memory.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"692 ","pages":"Article 162724"},"PeriodicalIF":6.3,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-18DOI: 10.1016/j.apsusc.2025.162721
Shiyao Wang , Pengfei Zhang , Xi Zhang , Detao Xia , Peng Zhao , Jie Meng , Nengjie Feng , Hui Wan , Guofeng Guan
It is important to design and develop catalysts with good water resistance to cope with the toxicity of water vapor on catalyst activity. In this study, we proposed a simple method to improve the water resistance of catalysts for toluene catalytic combustion by preparing a series of Co-Ce composite oxide catalysts via a citrate sol–gel method. Experimental results showed that Co6Ce1Ox exhibited the best catalytic activity (T50 = 236 ℃; T90 = 251 ℃) and water resistance among all the catalysts. The crystal structure and surface chemistry of the catalysts were analyzed using a series of correlation characterizations, and the adsorption energies of toluene and water on the catalysts were calculated using density functional theory (DFT). The results showed that the doping of Ce in Co3O4 had not only effectively changed the oxygen distribution state of Co3O4 and increased its oxygen vacancy content, thus greatly enhancing the oxidizing ability of the catalyst, but also suppressed the adsorption of H2O on the surface of the catalyst, and significantly enhanced the water resistance of the catalyst. The present work provided a new idea and method for developing efficient and excellent water resistant catalysts for the catalytic oxidation of toluene.
{"title":"Tuning the water resistance of Co3O4 catalysts via Ce incorporation for enhanced catalytic oxidation of toluene","authors":"Shiyao Wang , Pengfei Zhang , Xi Zhang , Detao Xia , Peng Zhao , Jie Meng , Nengjie Feng , Hui Wan , Guofeng Guan","doi":"10.1016/j.apsusc.2025.162721","DOIUrl":"10.1016/j.apsusc.2025.162721","url":null,"abstract":"<div><div>It is important to design and develop catalysts with good water resistance to cope with the toxicity of water vapor on catalyst activity. In this study, we proposed a simple method to improve the water resistance of catalysts for toluene catalytic combustion by preparing a series of Co-Ce composite oxide catalysts via a citrate sol–gel method. Experimental results showed that Co<sub>6</sub>Ce<sub>1</sub>O<sub>x</sub> exhibited the best catalytic activity (T<sub>50</sub> = 236 ℃; T<sub>90</sub> = 251 ℃) and water resistance among all the catalysts. The crystal structure and surface chemistry of the catalysts were analyzed using a series of correlation characterizations, and the adsorption energies of toluene and water on the catalysts were calculated using density functional theory (DFT). The results showed that the doping of Ce in Co<sub>3</sub>O<sub>4</sub> had not only effectively changed the oxygen distribution state of Co<sub>3</sub>O<sub>4</sub> and increased its oxygen vacancy content, thus greatly enhancing the oxidizing ability of the catalyst, but also suppressed the adsorption of H<sub>2</sub>O on the surface of the catalyst, and significantly enhanced the water resistance of the catalyst. The present work provided a new idea and method for developing efficient and excellent water resistant catalysts for the catalytic oxidation of toluene.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"692 ","pages":"Article 162721"},"PeriodicalIF":6.3,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-18DOI: 10.1016/j.apsusc.2025.162727
Xiaopei Li , Rongguo Ke , Erli Lin , Jiacheng Liu , Dexin Chen , Song-Zhu Kure-Chu , Xiufeng Xiao
To facilitate the application of Magnesium (Mg) alloys as biodegradable implants, multifunctional composite coating was fabricated by plasma electrolytic oxidation (PEO) in conjunction with hydrothermal and solvothermal methods on Mg-1Zn-1Gd (ZG11) alloy. The PEO coating was used as base layer, upon which a transition layer of ZnO was deposited by hydrothermal method. Finally, a metal organic framework (MOF, ZIF-8) outermost layer was synthetized by solvothermal method. It has been found that due to the introduction of MOF layer, the corrosion resistance, biocompatibility and even wear resistance of the coating was tremendously improved, which can primarily be attributable to the sealing and self-lubricating effects of ZIF-8 and the induced formation of hydroxyapatite (HAP) during degradation in simulated body fluid (SBF). Therefore, the present study spotlights the potential of MOF layer in the realm of biomaterials and holds considerable significance for the further development of biodegradable Mg alloys.
{"title":"Multifunctional MOF-based composite coating on Mg alloy for biodegradable orthopedic implants","authors":"Xiaopei Li , Rongguo Ke , Erli Lin , Jiacheng Liu , Dexin Chen , Song-Zhu Kure-Chu , Xiufeng Xiao","doi":"10.1016/j.apsusc.2025.162727","DOIUrl":"10.1016/j.apsusc.2025.162727","url":null,"abstract":"<div><div>To facilitate the application of Magnesium (Mg) alloys as biodegradable implants, multifunctional composite coating was fabricated by plasma electrolytic oxidation (PEO) in conjunction with hydrothermal and solvothermal methods on Mg-1Zn-1Gd (ZG11) alloy. The PEO coating was used as base layer, upon which a transition layer of ZnO was deposited by hydrothermal method. Finally, a metal organic framework (MOF, ZIF-8) outermost layer was synthetized by solvothermal method. It has been found that due to the introduction of MOF layer, the corrosion resistance, biocompatibility and even wear resistance of the coating was tremendously improved, which can primarily be attributable to the sealing and self-lubricating effects of ZIF-8 and the induced formation of hydroxyapatite (HAP) during degradation in simulated body fluid (SBF). Therefore, the present study spotlights the potential of MOF layer in the realm of biomaterials and holds considerable significance for the further development of biodegradable Mg alloys.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"692 ","pages":"Article 162727"},"PeriodicalIF":6.3,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Electrocatalytic ammonia synthesis is an attractive strategy for low-temperature ammonia production. Designing efficient electrocatalysts with high activity and selectivity for the nitrogen reduction reaction (NRR) remains a significant challenge. In this study, we demonstrate the feasibility of single-atom catalysts (SACs) for NRR using density functional theory (DFT) calculations, focusing on single transition metal (TM) atoms (from Sc to Zn) supported on nitrogen-doped carbon materials (CN4). The results show that N2 molecules can be efficiently activated on TMN4 in an end-on configuration, followed by the distal associative pathway to achieve NRR ammonia synthesis. Moreover, the calculation results of NRR reaction activity for ten TMN4 SACs reveal that CrN4 SAC exhibits high NRR activity with a limiting potential of −0.70 eV and greater reaction selectivity over the competing hydrogen evolution reaction (HER). Multiple-level descriptors (ΔG*N2, Bader charge, charge differential density, ELF, pCOHP, and PDOS) reveal the origin of NRR activity from the perspectives of energy and electronic structure. The dissolution potential and AIMD dynamic calculation further verify its structural stability. This work provides theoretical guidance for the rational design, screening, and development of efficient SACs for the NRR process.
{"title":"Theoretical study on the mechanism of electrocatalytic nitrogen reduction of ammonia with single-atom catalyst loaded on CN4","authors":"Dandan Xu, Beibei Yan, Qinghua Liu, Lidong Zhang, Jinglan Wang, Guanyi Chen, Zhanjun Cheng","doi":"10.1016/j.apsusc.2025.162726","DOIUrl":"https://doi.org/10.1016/j.apsusc.2025.162726","url":null,"abstract":"Electrocatalytic ammonia synthesis is an attractive strategy for low-temperature ammonia production. Designing efficient electrocatalysts with high activity and selectivity for the nitrogen reduction reaction (NRR) remains a significant challenge. In this study, we demonstrate the feasibility of single-atom catalysts (SACs) for NRR using density functional theory (DFT) calculations, focusing on single transition metal (TM) atoms (from Sc to Zn) supported on nitrogen-doped carbon materials (CN<sub>4</sub>). The results show that N<sub>2</sub> molecules can be efficiently activated on TMN<sub>4</sub> in an end-on configuration, followed by the distal associative pathway to achieve NRR ammonia synthesis. Moreover, the calculation results of NRR reaction activity for ten TMN<sub>4</sub> SACs reveal that CrN<sub>4</sub> SAC exhibits high NRR activity with a limiting potential of −0.70 eV and greater reaction selectivity over the competing hydrogen evolution reaction (HER). Multiple-level descriptors (ΔG<sub>*N2</sub>, Bader charge, charge differential density, ELF, pCOHP, and PDOS) reveal the origin of NRR activity from the perspectives of energy and electronic structure. The dissolution potential and AIMD dynamic calculation further verify its structural stability. This work provides theoretical guidance for the rational design, screening, and development of efficient SACs for the NRR process.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"64 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Electrocatalytic water splitting is key for sustainable hydrogen production, requiring efficient catalysts. Morphological tailoring represents a promising strategy to optimize electrocatalytic performance by modifying material structures at the nanoscale. This study shows ZIF-67 transformation from nanocubes to rhombic dodecahedra when anchored to 3D NiAl-layered double hydroxide (LDH) nanosheets, enhancing its catalytic properties. The ZIF-67/NiAl-LDH/N composite showcases effective synergy, improving oxygen evolution reaction (OER) performance through better electron transfer. The rhombic dodecahedron’s greater surface area increases Co-based active sites, enhancing interaction with reactants. NiAl-LDH intrinsic catalytic properties from nickel further boost ZIF-67 performance. This composite demonstrates impressive durability and OER activity, with low overpotentials of 190 mV at 20 mA cm−2 and 260 mV at 50 mA cm−2, alongside a Tafel slope of 48 mV dec−1, indicating suitability for large-scale energy applications.
{"title":"Synergistic ZIF-67(Co) anchoring NiAl-LDH nanosheets: Morphology transformation for efficient electrocatalytic oxygen evolution reaction","authors":"Afsaneh Ahmadi , Mohammad Chahkandi , Mahboobeh Zargazi , Taymaz Tabari","doi":"10.1016/j.apsusc.2025.162718","DOIUrl":"10.1016/j.apsusc.2025.162718","url":null,"abstract":"<div><div>Electrocatalytic water splitting is key for sustainable hydrogen production, requiring efficient catalysts. Morphological tailoring represents a promising strategy to optimize electrocatalytic performance by modifying material structures at the nanoscale. This study shows ZIF-67 transformation from nanocubes to rhombic dodecahedra when anchored to 3D NiAl-layered double hydroxide (LDH) nanosheets, enhancing its catalytic properties. The ZIF-67/NiAl-LDH/N composite showcases effective synergy, improving oxygen evolution reaction (OER) performance through better electron transfer. The rhombic dodecahedron’s greater surface area increases Co-based active sites, enhancing interaction with reactants. NiAl-LDH intrinsic catalytic properties from nickel further boost ZIF-67 performance. This composite demonstrates impressive durability and OER activity, with low overpotentials of 190 mV at 20 mA cm<sup>−2</sup> and 260 mV at 50 mA cm<sup>−2</sup>, alongside a Tafel slope of 48 mV dec<sup>−1</sup>, indicating suitability for large-scale energy applications.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"692 ","pages":"Article 162718"},"PeriodicalIF":6.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143435492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-17DOI: 10.1016/j.apsusc.2025.162713
Kryštof Kašša , Sabrin Abdallah , Ondřej Havelka , Milan Masař , Michal Urbánek , Dariusz Łukowiec , Martin Cvek , Rafael Torres-Mendieta
In this study, we explore the dual functionality of reactive laser ablation in liquids (RLAL) for fabricating nonequilibrium Au-Ti nanoparticles (NPs) and laser-induced periodic surface structures (LIPSS) on Ti solid targets. By irradiating Ti solid targets in an aqueous KAuCl4 solution, we synthesize Au-Ti NPs with distinct optoelectronic properties, including enhanced light absorption into the visible spectrum and plasmonic effects that promote efficient charge separation. Concurrently, LIPSS formed on the Ti surface act as heterogeneous nucleation sites, facilitating controlled nanostructure growth and significantly enhancing the solid target’s photocatalytic performance. Both the NPs and treated Ti solid target exhibit promising electrochemical activity, with the presence of Au-boosting light-driven processes under UV and visible light. The synergy between the NPs’ optoelectronic behavior and the potential catalytic properties of the modified Ti surfaces creates a versatile platform for applications in photocatalysis, energy conversion, and sensors after further developments. Our findings underscore RLAL as a sustainable, efficient method for creating multielement nanostructures and modifying solid surfaces, advancing their utility in green chemistry and light-driven technologies.
{"title":"Unlocking the role of byproducts in reactive laser ablation in liquids: A pathway to dual-function Au-Ti nanostructures","authors":"Kryštof Kašša , Sabrin Abdallah , Ondřej Havelka , Milan Masař , Michal Urbánek , Dariusz Łukowiec , Martin Cvek , Rafael Torres-Mendieta","doi":"10.1016/j.apsusc.2025.162713","DOIUrl":"10.1016/j.apsusc.2025.162713","url":null,"abstract":"<div><div>In this study, we explore the dual functionality of reactive laser ablation in liquids (RLAL) for fabricating nonequilibrium Au-Ti nanoparticles (NPs) and laser-induced periodic surface structures (LIPSS) on Ti solid targets. By irradiating Ti solid targets in an aqueous KAuCl<sub>4</sub> solution, we synthesize Au-Ti NPs with distinct optoelectronic properties, including enhanced light absorption into the visible spectrum and plasmonic effects that promote efficient charge separation. Concurrently, LIPSS formed on the Ti surface act as heterogeneous nucleation sites, facilitating controlled nanostructure growth and significantly enhancing the solid target’s photocatalytic performance. Both the NPs and treated Ti solid target exhibit promising electrochemical activity, with the presence of Au-boosting light-driven processes under UV and visible light. The synergy between the NPs’ optoelectronic behavior and the potential catalytic properties of the modified Ti surfaces creates a versatile platform for applications in photocatalysis, energy conversion, and sensors after further developments. Our findings underscore RLAL as a sustainable, efficient method for creating multielement nanostructures and modifying solid surfaces, advancing their utility in green chemistry and light-driven technologies.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"692 ","pages":"Article 162713"},"PeriodicalIF":6.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To tackle the issue of the low mechanical effect of traditional abrasives in polishing silicon carbide wafers, we successfully prepared mullite-based composite abrasive particles with a dense structure and favorable mechanical properties through the deposition of polymeric hydroxy-aluminum on the silica particle surface and the adjustment of the aluminum-to-silicon ratio. In this study, a range of characterization techniques, including electron microscopy, nitrogen adsorption-desorption measurements, and X-ray diffractometer, were employed to thoroughly examine the micro-morphology, surface characteristics, and lattice structures of the calcined samples. By analyzing the microstructural evolution in the particles and the variation pattern of their polishing effect, it is evident that the amplified mechanical effect resulting from the increased hardness of the abrasive particles, as the aluminum-to-silica ratio rises, greatly heightens the polishing rate, but also exacerbates surface unevenness. We hereby deduced that the improvement in the mechanical action of the abrasives during polishing mainly stems from the strengthening action of grain boundaries and the synergistic effect of structural densification. Notably, the synthesized abrasives can achieve an average removal rate of 0.93 μm/h, while ensuring surface planarization (Ra = 0.28 nm). Our findings provide enlightening perspectives for the preparation and performance evaluation of mullite-based particles, guiding their development and application.
{"title":"Mullite-based abrasives for chemical mechanical polishing of silicon carbide","authors":"Hanqi Xu, Dexiang Li, Zhuojie Wang, Ping Song, Yujun Zhao, Hongjiu Su","doi":"10.1016/j.apsusc.2025.162714","DOIUrl":"https://doi.org/10.1016/j.apsusc.2025.162714","url":null,"abstract":"To tackle the issue of the low mechanical effect of traditional abrasives in polishing silicon carbide wafers, we successfully prepared mullite-based composite abrasive particles with a dense structure and favorable mechanical properties through the deposition of polymeric hydroxy-aluminum on the silica particle surface and the adjustment of the aluminum-to-silicon ratio. In this study, a range of characterization techniques, including electron microscopy, nitrogen adsorption-desorption measurements, and X-ray diffractometer, were employed to thoroughly examine the micro-morphology, surface characteristics, and lattice structures of the calcined samples. By analyzing the microstructural evolution in the particles and the variation pattern of their polishing effect, it is evident that the amplified mechanical effect resulting from the increased hardness of the abrasive particles, as the aluminum-to-silica ratio rises, greatly heightens the polishing rate, but also exacerbates surface unevenness. We hereby deduced that the improvement in the mechanical action of the abrasives during polishing mainly stems from the strengthening action of grain boundaries and the synergistic effect of structural densification. Notably, the synthesized abrasives can achieve an average removal rate of 0.93 μm/h, while ensuring surface planarization (Ra = 0.28 nm). Our findings provide enlightening perspectives for the preparation and performance evaluation of mullite-based particles, guiding their development and application.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"72 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143435044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The development of cost-effective, highly efficient, and stable bifunctional catalysts to replace precious metal-based electrocatalysts is essential for practical applications of rechargeable zinc-air batteries. In this work, two-dimensional bimetallic NiFe metal organic framework/nitrogen-doped reduced graphene oxide (2D NiFe MOF/N-rGO) was developed through a simple two-stage hydrothermal method. The uniformly distributed and closely packed 2D NiFe MOF nanosheets not only increase the specific surface area of the material but also provide abundant active sites for electrocatalytic reactions. The 2D NiFe MOF/N-rGO hybrid material exhibits a high bifunctional oxygen electrocatalytic activities (ΔE = 0.68 V) with a half-wave potential (E1/2) of 0.8 V (vs. RHE) for oxygen reduction reaction (ORR) and an overpotential of 250 mV at 10 mA cm−2 (η10) for oxygen evolution reaction (OER), superior to the state-of-the-art Pt/C and RuO2 catalysts. Moreover, a rechargeable zinc-air battery with NiFe MOF/N-rGO as a cathode catalyst delivers a peak power density of 146.8 mW cm−2 and enhanced cycling stability, demonstrating its potential as a bifunctional catalyst with non-noble metal for metal-air batteries.
{"title":"A bimetallic 2D NiFe MOF/N-doped reduced graphene oxide as a bifunctional oxygen catalyst for rechargeable zinc-air batteries","authors":"Yi-Pin Chan, Chun-Shuo Huang, Chi-Yen Lai, Yu-Ching Chen, Daniel Chang, Yu-Wei Chuang, Ko-Fan Tu, Che-Ning Yeh","doi":"10.1016/j.apsusc.2025.162720","DOIUrl":"10.1016/j.apsusc.2025.162720","url":null,"abstract":"<div><div>The development of cost-effective, highly efficient, and stable bifunctional catalysts to replace precious metal-based electrocatalysts is essential for practical applications of rechargeable zinc-air batteries. In this work, two-dimensional bimetallic NiFe metal organic framework/nitrogen-doped reduced graphene oxide (2D NiFe MOF/N-rGO) was developed through a simple two-stage hydrothermal method. The uniformly distributed and closely packed 2D NiFe MOF nanosheets not only increase the specific surface area of the material but also provide abundant active sites for electrocatalytic reactions. The 2D NiFe MOF/N-rGO hybrid material exhibits a high bifunctional oxygen electrocatalytic activities (ΔE = 0.68 V) with a half-wave potential (E<sub>1/2</sub>) of 0.8 V (vs. RHE) for oxygen reduction reaction (ORR) and an overpotential of 250 mV at 10 mA cm<sup>−2</sup> (η<sub>10</sub>) for oxygen evolution reaction (OER), superior to the state-of-the-art Pt/C and RuO<sub>2</sub> catalysts. Moreover, a rechargeable zinc-air battery with NiFe MOF/N-rGO as a cathode catalyst delivers a peak power density of 146.8 mW cm<sup>−2</sup> and enhanced cycling stability, demonstrating its potential as a bifunctional catalyst with non-noble metal for metal-air batteries.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"692 ","pages":"Article 162720"},"PeriodicalIF":6.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143435493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-17DOI: 10.1016/j.apsusc.2025.162679
Ming Hong, Phuong Uyen Do, Chan Hyun Lee, Yeong Don Park
Incorporating carbon-based materials with electrical conductivity and chemical stability is an effective and cost-efficient approach for overcoming the limitations of conjugated polymer gas sensors, such as poor sensitivity, response rate, and low stability. Porous carbon has a large surface area and superior conductivity, which can further improve its gas-sensing performance. This study presents an organic field-effect transistor (OFET) gas sensor based on a poly(3-hexylthiophene) (P3HT) film and functionalized porous carbon materials. Porous carbon derived from the carbonization of polyvinyl chloride (PVC) is subjected to various chemical treatments to introduce oxygen-containing groups, including hydroxyl (–OH), carbonyl (–CO), and carboxyl (–COOH) groups. The experimental results indicated that these functional groups markedly enhanced the performance of the sensors owing to strong interactions with the target gases. Notably, the sensor blended with HCl-treated (–OH-modified) porous carbon exhibited the highest sensitivity and selectivity towards NO2. Furthermore, the P3HT film blended with porous carbon exhibited superior air stability and recovery performance.
{"title":"Enhanced gas sensing performance of polythiophene film with surface engineered porous carbon","authors":"Ming Hong, Phuong Uyen Do, Chan Hyun Lee, Yeong Don Park","doi":"10.1016/j.apsusc.2025.162679","DOIUrl":"https://doi.org/10.1016/j.apsusc.2025.162679","url":null,"abstract":"Incorporating carbon-based materials with electrical conductivity and chemical stability is an effective and cost-efficient approach for overcoming the limitations of conjugated polymer gas sensors, such as poor sensitivity, response rate, and low stability. Porous carbon has a large surface area and superior conductivity, which can further improve its gas-sensing performance. This study presents an organic field-effect transistor (OFET) gas sensor based on a poly(3-hexylthiophene) (P3HT) film and functionalized porous carbon materials. Porous carbon derived from the carbonization of polyvinyl chloride (PVC) is subjected to various chemical treatments to introduce oxygen-containing groups, including hydroxyl (–OH), carbonyl (–C<img alt=\"double bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/dbnd.gif\" style=\"vertical-align:middle\"/>O), and carboxyl (–COOH) groups. The experimental results indicated that these functional groups markedly enhanced the performance of the sensors owing to strong interactions with the target gases. Notably, the sensor blended with HCl-treated (–OH-modified) porous carbon exhibited the highest sensitivity and selectivity towards NO<sub>2</sub>. Furthermore, the P3HT film blended with porous carbon exhibited superior air stability and recovery performance.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"12 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O), and carboxyl (–COOH) groups. The experimental results indicated that these functional groups markedly enhanced the performance of the sensors owing to strong interactions with the target gases. Notably, the sensor blended with HCl-treated (–OH-modified) porous carbon exhibited the highest sensitivity and selectivity towards NO2. Furthermore, the P3HT film blended with porous carbon exhibited superior air stability and recovery performance.
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