Two-dimensional transition metal carbon/nitrides (MXenes) have emerged as prominent materials in the development of high-performance electromagnetic interference (EMI) shielding films owing to their exceptional electrical conductivity, special layered structure, and chemically active surfaces. Substantial efforts have been devoted to addressing the poor mechanical strength and limited functionality of pure MXene films through structural design and interfacial reinforcement. However, there is a notable lack of a systematic review of the research on MXene-based EMI shielding films with multi-layer structures, which could provide a theoretical foundation and technical guidance for the development and application of shielding films. This review aims to summarize the recent advancements in MXene-based layered films for EMI shielding. First, the structure and properties of MXene nanosheets are systematically introduced. Next, the optimization of layered structures and interfacial reinforcement strategies in MXene-based EMI shielding films are objectively reviewed, followed by a discussion of their multifunctional compatibility. Finally, future prospects and challenges for MXene-based layered EMI shielding films are highlighted.
{"title":"Recent progress of Ti3C2Tx MXene-based layered films for electromagnetic interference shielding","authors":"Jingyu Dong, Congqi Liu, Hongli Cheng, Changlong Jiang, Bing Zhou, Ming Huang, Chuntai Liu, Yuezhan Feng","doi":"10.1016/j.jmst.2024.10.032","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.032","url":null,"abstract":"Two-dimensional transition metal carbon/nitrides (MXenes) have emerged as prominent materials in the development of high-performance electromagnetic interference (EMI) shielding films owing to their exceptional electrical conductivity, special layered structure, and chemically active surfaces. Substantial efforts have been devoted to addressing the poor mechanical strength and limited functionality of pure MXene films through structural design and interfacial reinforcement. However, there is a notable lack of a systematic review of the research on MXene-based EMI shielding films with multi-layer structures, which could provide a theoretical foundation and technical guidance for the development and application of shielding films. This review aims to summarize the recent advancements in MXene-based layered films for EMI shielding. First, the structure and properties of MXene nanosheets are systematically introduced. Next, the optimization of layered structures and interfacial reinforcement strategies in MXene-based EMI shielding films are objectively reviewed, followed by a discussion of their multifunctional compatibility. Finally, future prospects and challenges for MXene-based layered EMI shielding films are highlighted.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"19 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-11-19DOI: 10.1016/j.jmst.2024.10.030
Haicheng Zhu, Bingrui Liu, Shaohong Liu, Limin Zhou, Hao Cui, Manmen Liu, Li Chen, Ming Wen, Haigang Dong, Feng Liu, Song Li, Liang Zuo
The pursuit of Ag-based alloys with both high strength and toughness has posed a longstanding challenge. In this study, we investigated the cluster strengthening and grain refinement toughening mechanisms in fully oxidized AgMgNi alloys, which were internally oxidized at 800°C for 8 h under an oxygen atmosphere. We found that Mg–O clusters contributed to the hardening (138 HV) and strengthening (376.9 MPa) of the AgMg alloy through solid solution strengthening effects, albeit at the expense of ductility. To address this limitation, we introduced Ni nanoparticles into the AgMg alloy, resulting in significant grain refinement within its microstructure. Specifically, the grain size decreased from 67.2 μm in the oxidized AgMg alloy to below 6.0 μm in the oxidized AgMgNi alloy containing 0.3 wt% Ni. Consequently, the toughness increased significantly, rising from toughness value of 2177.9 MJ m–³ in the oxidized AgMg alloy to 6186.1 MJ m–³ in the oxidized AgMgNi alloy, representing a remarkable 2.8-fold enhancement. Furthermore, the internally oxidized AgMgNi alloy attained a strength of up to 387.6 MPa, comparable to that of the internally oxidized AgMg alloy, thereby demonstrating the successful realization of concurrent strengthening and toughening. These results collectively offer a novel approach for the design of high-performance alloys through the synergistic combination of cluster strengthening and grain refinement toughening.
{"title":"Mechanistic insights into cluster strengthening and grain refinement toughening in fully oxidized AgMgNi alloys","authors":"Haicheng Zhu, Bingrui Liu, Shaohong Liu, Limin Zhou, Hao Cui, Manmen Liu, Li Chen, Ming Wen, Haigang Dong, Feng Liu, Song Li, Liang Zuo","doi":"10.1016/j.jmst.2024.10.030","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.030","url":null,"abstract":"The pursuit of Ag-based alloys with both high strength and toughness has posed a longstanding challenge. In this study, we investigated the cluster strengthening and grain refinement toughening mechanisms in fully oxidized AgMgNi alloys, which were internally oxidized at 800°C for 8 h under an oxygen atmosphere. We found that Mg–O clusters contributed to the hardening (138 HV) and strengthening (376.9 MPa) of the AgMg alloy through solid solution strengthening effects, albeit at the expense of ductility. To address this limitation, we introduced Ni nanoparticles into the AgMg alloy, resulting in significant grain refinement within its microstructure. Specifically, the grain size decreased from 67.2 μm in the oxidized AgMg alloy to below 6.0 μm in the oxidized AgMgNi alloy containing 0.3 wt% Ni. Consequently, the toughness increased significantly, rising from toughness value of 2177.9 MJ m<sup>–</sup>³ in the oxidized AgMg alloy to 6186.1 MJ m<sup>–</sup>³ in the oxidized AgMgNi alloy, representing a remarkable 2.8-fold enhancement. Furthermore, the internally oxidized AgMgNi alloy attained a strength of up to 387.6 MPa, comparable to that of the internally oxidized AgMg alloy, thereby demonstrating the successful realization of concurrent strengthening and toughening. These results collectively offer a novel approach for the design of high-performance alloys through the synergistic combination of cluster strengthening and grain refinement toughening.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"13 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-11-19DOI: 10.1016/j.jmst.2024.10.029
Lian Yin, Jiale Zhang, Jianjian Luo, Yongqian Shi, Bin Yu, Sheng Zhang, Keqing Zhou
With the continuous advancement of electronic devices, flexible thin films with both thermal management functions and excellent electromagnetic interference (EMI) shielding properties have received much attention. Hence, inspired by Janus, a CNF/MXene/ZnFe2O4@PANI composite film with an asymmetric gradient alternating structure was successfully prepared by adjusting the filler content of the conductive and magnetic layers using a vacuum-assisted filtration method. Benefiting from the magnetic resonance and hysteresis loss of ZnFe2O4@PANI, conductive loss and dipole polarization of MXene, as well as the exclusive “absorption-reflection-reabsorption” shielding feature in the alternating multilayered films, CM&CZFP-4G film has superior EMI shielding performance, with an EMI SE of up to 45.75 dB and shielding effectiveness of 99.99%. Surprisingly, the composite film maintains reliable EMI shielding properties even after prolonged erosion in harsh environments such as high/low temperatures, high humidity, acids and alkalis. Furthermore, the CM&CZFP-4G responded quickly within about 50 s and reached a maximum steady-state temperature of 235.8 °C at an applied voltage of 9.0 V, indicating the obtained film acquired outstanding and controllable Joule heating performance. This result was attributed to the homogeneous dispersion of MXene to build up a conductive network and endow the CNF/MXene with high conductivity. Meanwhile, the fire resistance of CM&CZFP-4G was significantly improved compared to pure CNF, which guaranteed fire safety during its application. Additionally, contributed by long fiber entanglement of CNF, extensive hydrogen-bonding interactions and multilayer structural design, the CM&CZFP-4G film exhibits excellent mechanical characteristics, with the tensile strength and fracture strain of 27.74 MPa and 6.21%, separately. This work offers a creative avenue to prepare multifunctional composite films with electromagnetic shielding and Joule heating for various application environments.
{"title":"Janus-inspired alternating architecture CNF/MXene/ZnFe2O4@PANI composite films with outstanding electromagnetic interference shielding and Joule heating","authors":"Lian Yin, Jiale Zhang, Jianjian Luo, Yongqian Shi, Bin Yu, Sheng Zhang, Keqing Zhou","doi":"10.1016/j.jmst.2024.10.029","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.029","url":null,"abstract":"With the continuous advancement of electronic devices, flexible thin films with both thermal management functions and excellent electromagnetic interference (EMI) shielding properties have received much attention. Hence, inspired by Janus, a CNF/MXene/ZnFe<sub>2</sub>O<sub>4</sub>@PANI composite film with an asymmetric gradient alternating structure was successfully prepared by adjusting the filler content of the conductive and magnetic layers using a vacuum-assisted filtration method. Benefiting from the magnetic resonance and hysteresis loss of ZnFe<sub>2</sub>O<sub>4</sub>@PANI, conductive loss and dipole polarization of MXene, as well as the exclusive “absorption-reflection-reabsorption” shielding feature in the alternating multilayered films, CM&CZFP-4G film has superior EMI shielding performance, with an EMI SE of up to 45.75 dB and shielding effectiveness of 99.99%. Surprisingly, the composite film maintains reliable EMI shielding properties even after prolonged erosion in harsh environments such as high/low temperatures, high humidity, acids and alkalis. Furthermore, the CM&CZFP-4G responded quickly within about 50 s and reached a maximum steady-state temperature of 235.8 °C at an applied voltage of 9.0 V, indicating the obtained film acquired outstanding and controllable Joule heating performance. This result was attributed to the homogeneous dispersion of MXene to build up a conductive network and endow the CNF/MXene with high conductivity. Meanwhile, the fire resistance of CM&CZFP-4G was significantly improved compared to pure CNF, which guaranteed fire safety during its application. Additionally, contributed by long fiber entanglement of CNF, extensive hydrogen-bonding interactions and multilayer structural design, the CM&CZFP-4G film exhibits excellent mechanical characteristics, with the tensile strength and fracture strain of 27.74 MPa and 6.21%, separately. This work offers a creative avenue to prepare multifunctional composite films with electromagnetic shielding and Joule heating for various application environments.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"6 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-11-19DOI: 10.1016/j.jmst.2024.10.028
Lihui Pang, Le Jiang, Meng Zhao, Jinniu Zhang, Qiyi Zhao, Lu Li, Rongqian Wu, Yi Lv, Wenjun Liu
Nanomaterials with promising optical, mechanical and electrical properties have garnered significant interest in photonics and electronics. However, the integration of nanomaterials with diverse characteristics for potential ultrafast photonics applications has emerged as a focal point. In this study, two-dimensional MXene (Ti3C2Tx) and CuO nanoparticles were synthesized to create heterostructure materials. The surface morphology, chemical composition and nonlinear absorption properties of the heterostructure materials were investigated. First-principle-based theoretical calculations were performed to explore the electronic and optical properties of the Ti3C2Tx/CuO heterojunction, offering insights into its essential properties and supporting the potential optoelectronic applications. Importantly, the Ti3C2Tx/CuO heterojunction effectively functioned as saturable absorbers in ultrafast lasers. Incorporating the Ti3C2Tx/CuO-based saturable absorber into a net-anomalous dispersion fiber cavity generated stable conventional-soliton pulses with duration of 495 fs. Additionally, adjusting cavity dispersion to net-normal allowed the Ti3C2Tx/CuO-based saturable absorber to generate dissipative soliton with a pulse width of 22 ps. The performance of Ti3C2Tx/CuO-based fiber lasers demonstrates enhancements over previous works. This study confirms that the Ti3C2Tx/CuO heterojunction is a promising nonlinear optical material for ultrafast applications and advanced MXene-based photonic devices.
{"title":"Ti3C2Tx/CuO heterojunction for ultrafast photonics","authors":"Lihui Pang, Le Jiang, Meng Zhao, Jinniu Zhang, Qiyi Zhao, Lu Li, Rongqian Wu, Yi Lv, Wenjun Liu","doi":"10.1016/j.jmst.2024.10.028","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.028","url":null,"abstract":"Nanomaterials with promising optical, mechanical and electrical properties have garnered significant interest in photonics and electronics. However, the integration of nanomaterials with diverse characteristics for potential ultrafast photonics applications has emerged as a focal point. In this study, two-dimensional MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) and CuO nanoparticles were synthesized to create heterostructure materials. The surface morphology, chemical composition and nonlinear absorption properties of the heterostructure materials were investigated. First-principle-based theoretical calculations were performed to explore the electronic and optical properties of the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/CuO heterojunction, offering insights into its essential properties and supporting the potential optoelectronic applications. Importantly, the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/CuO heterojunction effectively functioned as saturable absorbers in ultrafast lasers. Incorporating the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/CuO-based saturable absorber into a net-anomalous dispersion fiber cavity generated stable conventional-soliton pulses with duration of 495 fs. Additionally, adjusting cavity dispersion to net-normal allowed the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/CuO-based saturable absorber to generate dissipative soliton with a pulse width of 22 ps. The performance of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/CuO-based fiber lasers demonstrates enhancements over previous works. This study confirms that the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/CuO heterojunction is a promising nonlinear optical material for ultrafast applications and advanced MXene-based photonic devices.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"233 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-11-19DOI: 10.1016/j.jmst.2024.11.003
Z.Y. Ni, Z.Y. Li, S.Y. Peng, Y.Z. Tian
As a kind of planar defect, stacking faults are seldom explored. Quantitatively evaluating the correlation between stacking faults (SFs) and strength remains unclear. In the present work, we conducted tensile tests at specified true strains and characterized deformation microstructures for a nonequiatomic CoCrNi alloy with very low stacking fault energy (SFE). Characteristics of stacking fault spacing, stacking fault density, and stacking fault strengthening quantification were investigated. This work provides a reasonable reference for the quantitative calculation of stacking fault strengthening.
{"title":"Quantifying the strengthening effect of stacking faults in a nonequiatomic CoCrNi alloy","authors":"Z.Y. Ni, Z.Y. Li, S.Y. Peng, Y.Z. Tian","doi":"10.1016/j.jmst.2024.11.003","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.003","url":null,"abstract":"As a kind of planar defect, stacking faults are seldom explored. Quantitatively evaluating the correlation between stacking faults (SFs) and strength remains unclear. In the present work, we conducted tensile tests at specified true strains and characterized deformation microstructures for a nonequiatomic CoCrNi alloy with very low stacking fault energy (SFE). Characteristics of stacking fault spacing, stacking fault density, and stacking fault strengthening quantification were investigated. This work provides a reasonable reference for the quantitative calculation of stacking fault strengthening.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"65 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-11-19DOI: 10.1016/j.jmst.2024.09.050
Haoyuan Zheng, Yuxiao Jia, Chen Jin, Hang Che, , Guang Liu, Li Wang, Yuyuan Zhao, Shixuan He, Haizhen Liu, Xinhua Wang, Yifeng Yu, Mi Yan
The magnesium based metal hydrogen storage composite system Mg(NH2)2-2LiH has a theoretical hydrogen storage capacity of 5.6 wt.% and is a promising hydrogen storage material for vehicles. However, its application is limited due to serious thermodynamic and kinetic barriers. Introducing efficient catalysts is an effective method to improve the hydrogen storage performance of Mg(NH2)2-2LiH. This article investigates for the first time the use of nano rare earth oxide CeO2 (∼44.5 nm) as an efficient modifier, achieving comprehensive regulation of the hydrogen storage performance of Mg(NH2)2-2LiH composite system through oxygen vacancy driven catalysis. The modification mechanism of nano CeO2 is also systematically studied using density functional theory (DFT) calculations and experimental results. Research has shown that the comprehensive hydrogen storage performance of the Mg(NH2)2-2LiH-5 wt.% CeO2 composite system is optimal, with high hydrogen absorption and desorption kinetics and reversible performance. The initial hydrogen absorption and desorption temperatures of the composite system were significantly reduced from 110/130°C to 65/80°C, and the release of by-product ammonia was significantly inhibited. Under the conditions of 170°C/50 min and 180°C/100 min, 4.37 wt.% of hydrogen can be rapidly absorbed and released. After 10 cycles of hydrogen release, the hydrogen cycle retention rate increased from 85% to nearly 100%. Further mechanistic studies have shown that the nano CeO2−x generated in situ during hydrogen evolution can effectively weaken the Mg–N and N–H bonds of Mg(NH2)2, exhibiting good catalytic effects. Meanwhile, oxygen vacancies provide a fast pathway for the diffusion of hydrogen atoms in the composite system. In addition, nano CeO2−x can effectively inhibit the polycrystalline transformation of the hydrogen evolving product Li2MgN2H2 in the system at high temperatures, reducing the difficulty of re-hydrogenation of the system. This study provides an innovative perspective for the efficient modification of magnesium based metal hydrogen storage composite materials using rare earth based catalysts, and also provides a reference for regulating the comprehensive hydrogen storage performance of hydrogen storage materials using rare earth catalysts with oxygen vacancies.
{"title":"Experimental and theoretical study on high hydrogen storage performance of Mg(NH2)2-2LiH composite system driven by nano CeO2 oxygen vacancies","authors":"Haoyuan Zheng, Yuxiao Jia, Chen Jin, Hang Che, , Guang Liu, Li Wang, Yuyuan Zhao, Shixuan He, Haizhen Liu, Xinhua Wang, Yifeng Yu, Mi Yan","doi":"10.1016/j.jmst.2024.09.050","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.050","url":null,"abstract":"The magnesium based metal hydrogen storage composite system Mg(NH<sub>2</sub>)<sub>2</sub>-2LiH has a theoretical hydrogen storage capacity of 5.6 wt.% and is a promising hydrogen storage material for vehicles. However, its application is limited due to serious thermodynamic and kinetic barriers. Introducing efficient catalysts is an effective method to improve the hydrogen storage performance of Mg(NH<sub>2</sub>)<sub>2</sub>-2LiH. This article investigates for the first time the use of nano rare earth oxide CeO<sub>2</sub> (∼44.5 nm) as an efficient modifier, achieving comprehensive regulation of the hydrogen storage performance of Mg(NH<sub>2</sub>)<sub>2</sub>-2LiH composite system through oxygen vacancy driven catalysis. The modification mechanism of nano CeO<sub>2</sub> is also systematically studied using density functional theory (DFT) calculations and experimental results. Research has shown that the comprehensive hydrogen storage performance of the Mg(NH<sub>2</sub>)<sub>2</sub>-2LiH-5 wt.% CeO<sub>2</sub> composite system is optimal, with high hydrogen absorption and desorption kinetics and reversible performance. The initial hydrogen absorption and desorption temperatures of the composite system were significantly reduced from 110/130°C to 65/80°C, and the release of by-product ammonia was significantly inhibited. Under the conditions of 170°C/50 min and 180°C/100 min, 4.37 wt.% of hydrogen can be rapidly absorbed and released. After 10 cycles of hydrogen release, the hydrogen cycle retention rate increased from 85% to nearly 100%. Further mechanistic studies have shown that the nano CeO<sub>2−</sub><em><sub>x</sub></em> generated in situ during hydrogen evolution can effectively weaken the Mg–N and N–H bonds of Mg(NH<sub>2</sub>)<sub>2</sub>, exhibiting good catalytic effects. Meanwhile, oxygen vacancies provide a fast pathway for the diffusion of hydrogen atoms in the composite system. In addition, nano CeO<sub>2−</sub><em><sub>x</sub></em> can effectively inhibit the polycrystalline transformation of the hydrogen evolving product Li<sub>2</sub>MgN<sub>2</sub>H<sub>2</sub> in the system at high temperatures, reducing the difficulty of re-hydrogenation of the system. This study provides an innovative perspective for the efficient modification of magnesium based metal hydrogen storage composite materials using rare earth based catalysts, and also provides a reference for regulating the comprehensive hydrogen storage performance of hydrogen storage materials using rare earth catalysts with oxygen vacancies.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"11 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-11-16DOI: 10.1016/j.jmst.2024.11.002
Yizhou He, Qianxi Hao, Xue Yang, Jiamin Yu, Chi Zhang, Ruoyu Li, Qi Wang, Shaorong Li, Xiaowei Guo, Sergei K. Lazarouk
The crystalline fraction is a critical parameter for assessing the quality of silicon quantum dots (SiQDs), and its enhancement is anticipated to improve the optoelectronic performance of these materials. However, the crystalline fraction of small SiQDs produced through the pyrolysis of hydrogen silsesquioxane (HSQ) polymers still has significant potential for improvement. In this study, we successfully synthesized SiQDs with a diameter of approximately 3 nm and near-perfect crystallinity by optimizing the triethoxysilane (TES)/aqueous hydrochloric acid (HCl) volume ratio during the hydrolysis-condensation process of HSQ polymers. The SiQDs exhibited a photoluminescence (PL) center at 760 nm and an average PL quantum yield (PLQY) of 24.4%. Our findings demonstrate that the TES/aqueous HCl ratio significantly influences the proportion of cage structure and the cross-linking density of the network structure in HSQ polymers, which in turn governs SiQD size and crystallinity. A high proportion of cage structures in HSQ polymers promotes high crystallinity. Notably, an increased cross-linking density within the network structure results in elevated and uniform diffusion barriers. This phenomenon not only hinders the diffusion of silicon atoms, leading to smaller sizes but also facilitates the achievement of high crystallinity due to uniform diffusion. This work presents a novel approach to achieving exceptional crystalline in small SiQDs, with implications for advanced applications in lighting, display technologies, medical imaging, and photovoltaics.
{"title":"Triethoxysilane-derived silicon quantum dots: A novel pathway to small size and high crystallinity","authors":"Yizhou He, Qianxi Hao, Xue Yang, Jiamin Yu, Chi Zhang, Ruoyu Li, Qi Wang, Shaorong Li, Xiaowei Guo, Sergei K. Lazarouk","doi":"10.1016/j.jmst.2024.11.002","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.002","url":null,"abstract":"The crystalline fraction is a critical parameter for assessing the quality of silicon quantum dots (SiQDs), and its enhancement is anticipated to improve the optoelectronic performance of these materials. However, the crystalline fraction of small SiQDs produced through the pyrolysis of hydrogen silsesquioxane (HSQ) polymers still has significant potential for improvement. In this study, we successfully synthesized SiQDs with a diameter of approximately 3 nm and near-perfect crystallinity by optimizing the triethoxysilane (TES)/aqueous hydrochloric acid (HCl) volume ratio during the hydrolysis-condensation process of HSQ polymers. The SiQDs exhibited a photoluminescence (PL) center at 760 nm and an average PL quantum yield (PLQY) of 24.4%. Our findings demonstrate that the TES/aqueous HCl ratio significantly influences the proportion of cage structure and the cross-linking density of the network structure in HSQ polymers, which in turn governs SiQD size and crystallinity. A high proportion of cage structures in HSQ polymers promotes high crystallinity. Notably, an increased cross-linking density within the network structure results in elevated and uniform diffusion barriers. This phenomenon not only hinders the diffusion of silicon atoms, leading to smaller sizes but also facilitates the achievement of high crystallinity due to uniform diffusion. This work presents a novel approach to achieving exceptional crystalline in small SiQDs, with implications for advanced applications in lighting, display technologies, medical imaging, and photovoltaics.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"75 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142642798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-11-16DOI: 10.1016/j.jmst.2024.10.027
Shunhong Zhang, Yu Shen, Yujie Yan, Feng Guo, Weilong Shi
Coatings of marine equipment inevitably suffer from physical or chemical damage in service, together with biofouling from microbial attachment, leading to a shorter service life of them. Herein, a multifunctional corrosion-resistant coating with efficient photothermal self-healing and anti-biofouling performance was designed by using CuO/g-C3N4 (CuO/CN) S-scheme heterojunction filler in combination with polydimethylsiloxane (PDMS) as the coating matrix for achieving the effective protection of Q235 steel. The results of the electrochemical impedance spectroscopy (EIS) experiments indicate that the CuO/CN/PDMS composite coatings possessed excellent corrosion resistance, in which the impedance radius of optimal CuO/CN-1/PDMS composite coating could still remain 3.49 × 109 Ω cm2 after 60 d of immersion in seawater under sunlight irradiation. Meanwhile, the as-prepared CuO/CN/PDMS composite coating not only can be rapidly heated up under the Xenon lamp illumination to achieve complete self-repair of scratches within 45 min, but also exhibited excellent antimicrobial effects in the antifouling experiments. This study opens a new avenue for the development of g-C3N4-based multifunctional coatings and provides guidance for the development of the next generation of intelligent protective coatings.
{"title":"Integrated CuO/g-C3N4 S-scheme heterojunction self-healing coatings: A synergistic approach for advanced anti-corrosion and anti-biofouling performance","authors":"Shunhong Zhang, Yu Shen, Yujie Yan, Feng Guo, Weilong Shi","doi":"10.1016/j.jmst.2024.10.027","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.027","url":null,"abstract":"Coatings of marine equipment inevitably suffer from physical or chemical damage in service, together with biofouling from microbial attachment, leading to a shorter service life of them. Herein, a multifunctional corrosion-resistant coating with efficient photothermal self-healing and anti-biofouling performance was designed by using CuO/g-C<sub>3</sub>N<sub>4</sub> (CuO/CN) S-scheme heterojunction filler in combination with polydimethylsiloxane (PDMS) as the coating matrix for achieving the effective protection of Q235 steel. The results of the electrochemical impedance spectroscopy (EIS) experiments indicate that the CuO/CN/PDMS composite coatings possessed excellent corrosion resistance, in which the impedance radius of optimal CuO/CN-1/PDMS composite coating could still remain 3.49 × 10<sup>9</sup> Ω cm<sup>2</sup> after 60 d of immersion in seawater under sunlight irradiation. Meanwhile, the as-prepared CuO/CN/PDMS composite coating not only can be rapidly heated up under the Xenon lamp illumination to achieve complete self-repair of scratches within 45 min, but also exhibited excellent antimicrobial effects in the antifouling experiments. This study opens a new avenue for the development of g-C<sub>3</sub>N<sub>4</sub>-based multifunctional coatings and provides guidance for the development of the next generation of intelligent protective coatings.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"196 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142642797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-11-16DOI: 10.1016/j.jmst.2024.10.026
Jae Seob Lee, Kun Woo Baek, Narasimharao Kitchamsetti, Hyun Woo Kim, Jung Sang Cho
CoFe-Prussian blue analog (CoFe-PBA) template derived porous nanocages comprising hollow (Co,Fe)O nanoparticles are introduced as a highly efficient anode for lithium-ion batteries (LIBs) by integrating the co-precipitation and nanoscale Kirkendall diffusion processes. This strategic approach employs a solution-based facile polydopamine (PDA)-derived carbon coating process to control the oxidation rate of nanoparticles during subsequent heat treatment to achieve the hollow structure by the nanoscale Kirkendall diffusion effect. The application of different concentrations of PDA to the nanocages resulted in the formation of porous nanocages of three types, such as (Co,Fe)O@PDA-C-20, (Co,Fe)O@PDA-C-100, and (Co,Fe)O@PDA-C-200. Notably, (Co,Fe)O@PDA-C-100 porous nanocages exhibit remarkable cycling stability by the hollow structured (Co,Fe)O nanoparticles. Additionally, the hollow and porous structures facilitate rapid charge species diffusion, efficient electrolyte infiltration, and effective management of volumetric changes. When used as anodes for LIBs, the hollow (Co,Fe)O@PDA-C-100 anodes demonstrate impressive structural robustness and high-rate performance. They exhibit remarkable structural integrity, demonstrating stable cycling performance for up to 300 cycles at 0.5 and 1.0 A g⁻1 (capacity retentions of 99.3% and 97.2%, respectively). In terms of rate capability, the hollow (Co,Fe)O@PDA-C-100 porous nanocages exhibit a high discharge capacity of 284 mA h g⁻1 at 10 A g⁻1. Moreover, the practical application potential of the prepared hollow (Co,Fe)O@PDA-C-100 anode is demonstrated by a full-cell test paired with and Li(Ni0.8Co0.1Mn0.1)O2 cathode under the condition of practical application. This clearly highlights the structural advantages of the prepared hollow (Co,Fe)O@PDA-C-100 porous nanocages.
CoFe-Prussian blue analog (CoFe-PBA) 模板衍生的多孔纳米笼由中空（Co,Fe)O 纳米粒子组成，通过整合共沉淀和纳米级 Kirkendall 扩散过程，可作为锂离子电池 (LIB) 的高效负极。这种策略性方法采用了基于溶液的简便多巴胺（PDA）衍生碳涂层工艺，在随后的热处理过程中控制纳米粒子的氧化率，从而通过纳米级柯肯达尔扩散效应实现中空结构。将不同浓度的 PDA 应用于纳米笼后，形成了三种类型的多孔纳米笼，如 (Co,Fe)O@PDA-C-20、(Co,Fe)O@PDA-C-100 和 (Co,Fe)O@PDA-C-200。值得注意的是，(Co,Fe)O@PDA-C-100 多孔纳米笼与中空结构的(Co,Fe)O 纳米粒子相比，具有显著的循环稳定性。此外，中空和多孔结构有利于电荷物种的快速扩散、电解质的有效渗透以及体积变化的有效管理。中空（Co,Fe)O@PDA-C-100 阳极用作 LIB 的阳极时，表现出令人印象深刻的结构坚固性和高速率性能。它们具有出色的结构完整性，在 0.5 A g-1 和 1.0 A g-1 的条件下可稳定循环 300 次（容量保持率分别为 99.3% 和 97.2%）。在速率能力方面，空心（Co,Fe）O@PDA-C-100 多孔纳米笼在 10 A g-1 下表现出 284 mA h g-1 的高放电容量。此外，在实际应用条件下，制备的空心（Co,Fe）O@PDA-C-100 阳极与 Li(Ni0.8Co0.1Mn0.1)O2 阴极配对进行了全电池测试，证明了空心（Co,Fe）O@PDA-C-100 阳极的实际应用潜力。这清楚地表明了所制备的空心（Co,Fe）O@PDA-C-100 多孔纳米笼的结构优势。
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