Carbon最新文献

{"title":"In-situ growth of MoO2/MoS2 microspheres on reduced graphene oxide with enhanced dielectric polarization and impedance matching for boosting electromagnetic wave absorption","authors":"Yiman Lu,&nbsp;Xiaoning Zhao,&nbsp;Ya Lin,&nbsp;Zhongqiang Wang,&nbsp;Ye Tao,&nbsp;Haiyang Xu,&nbsp;Yichun Liu","doi":"10.1016/j.carbon.2025.120298","DOIUrl":"10.1016/j.carbon.2025.120298","url":null,"abstract":"<div><div>Dielectric materials are promising candidates for electromagnetic wave (EMW) absorption due to the significant contribution of dielectric loss to EM energy dissipation. However, dielectric materials with single component usually exhibit limited EMW absorption performance because of their impedance mismatching and insufficient EMW attenuation capability. Reasonable designs of structure and composition are required to improve their EMW absorption performance. Herein, the rGO/MoO₂/MoS₂ (RMM) composite with MoO₂/MoS₂ heterogeneous microspheres grown in situ on reduced graphene oxide (rGO) is prepared through intermolecular hydrogen bonding and thermal reduction. The introduction of MoO₂/MoS₂ microspheres not only endows the composite with abundant mesopores and large specific surface area, but also facilitates the formation of heterogeneous interfaces and structural defects. By manipulating the relative component content of MoO₂ and MoS₂, RMM achieves excellent EMW absorption. At a relatively thin thickness of 1.70 mm, the reflection loss (RL) and effective absorption bandwidth of the composite reach −74.81 dB and 4.37 GHz. Correspondingly, the specific RL (RL/t) of the composite comes to −440.06 dB/cm, which is at the forefront among other typical dielectric microwave absorbers. This work provides a universal strategy to develop high-performance dielectric-type EMW absorption materials.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"238 ","pages":"Article 120298"},"PeriodicalIF":10.5,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785194","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}

{"title":"Growing single-walled carbon nanotubes from alumina sheet supported catalyst and investigating carrier effects on chirality distribution","authors":"Qianru Wu ,&nbsp;Xin Chi ,&nbsp;Xiaojing Yao ,&nbsp;Guodong Xu ,&nbsp;Xiuyun Zhang ,&nbsp;Kezheng Chen ,&nbsp;Guangyi Lin ,&nbsp;Maoshuai He","doi":"10.1016/j.carbon.2025.120279","DOIUrl":"10.1016/j.carbon.2025.120279","url":null,"abstract":"<div><div>Both the structure and type of support material significantly influence the performances of supported metal catalyst in synthesizing single-walled carbon nanotubes (SWNTs) through chemical vapor deposition. In this work, thin porous boehmite sheets prepared by hydrothermal method are applied as the precursor carriers for developing a supported iron catalyst. Upon high temperature calcination, the resulting alumina (α-Al₂O₃) and Fe₂O₃ form a solid solution, which catalyzes the growth of SWNTs at a low temperature of 700 °C. Detailed optical characterizations reveal that mainly subnanometer SWNTs with a narrow chirality distribution are synthesized. To explore the roles of catalyst support in catalysis, a magnesia (MgO) supported Fe catalyst is also designed. The MgO supported catalyst achieves an even narrower chirality distribution compared to the alumina-supported counterpart. By combining experimental catalyst characterizations with theoretical calculations, the SWNT chirality distribution is revealed to be highly sensitive to the surface basicity of the support materials. The strong basicity of the MgO facilitates electron transfer to the supported Fe nanoparticles, enhancing the adsorption and dissociation of the carbon precursor. This interaction ultimately promotes the nucleation of SWNTs by a perpendicular model.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"238 ","pages":"Article 120279"},"PeriodicalIF":10.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777089","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}

{"title":"Perspectives on absorption-dominant electromagnetic interference shielding materials with MXene and carbon-based polymer composites","authors":"Nam Khanh Nguyen ,&nbsp;Daeyoung Kim ,&nbsp;Van Quan Phan ,&nbsp;Minji Kim ,&nbsp;Pangun Park ,&nbsp;Junghyo Nah","doi":"10.1016/j.carbon.2025.120276","DOIUrl":"10.1016/j.carbon.2025.120276","url":null,"abstract":"<div><div>Electromagnetic interference (EMI) shielding materials are essential for reducing unwanted electromagnetic radiation and ensuring the reliable operation of electronic devices. Among various EMI shielding strategies, absorption-dominated materials have gained significant attention due to their ability to reduce secondary reflection while maintaining high shielding effectiveness. This work provides a comprehensive overview of absorption-based EMI shielding materials, focusing on MXene- and carbon-based nanomaterials. The integration of these conductive nanomaterials into polymer matrix composites enables the development of lightweight, flexible, and easy-to-fabricate shielding materials. Furthermore, structural modifications such as foam architectures, gradient structures, and 3D-printed designs have been explored to enhance EM wave absorption while minimizing reflection. Additionally, novel strategies, including molecular-level surface functionalization, electrical polarization, and triboelectric surface charging effects, along with their synergistic interactions, have been explored to further suppress reflectivity and optimize absorption mechanisms. The practical applications of these materials span multi-band frequency EMI shielding, including 5G telecommunications, IoT devices, and automotive radar systems. Looking ahead, the integration of artificial intelligence (AI) and machine learning (ML) for materials design and optimization is expected to accelerate the discovery of next-generation high-performance, absorption-dominant EMI shielding materials. By leveraging data-driven approaches, researchers can predict shielding effectiveness, optimize material properties, and reduce experimental costs, leading to more efficient and scalable material development. This review highlights the current advancements, challenges, and future opportunities in absorption-dominant EMI shielding materials, providing an overview of highly efficient, low-reflectivity EMI shielding solutions.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"238 ","pages":"Article 120276"},"PeriodicalIF":10.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768718","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}

{"title":"Graphene oxide sheet size influences the ion adsorption and permeation behavior of laminate membranes","authors":"Shuai Tan ,&nbsp;Samantha Reid ,&nbsp;Manh Thuong Nguyen ,&nbsp;Elaf A. Anber ,&nbsp;Daniel Foley ,&nbsp;Richard Shiery ,&nbsp;Vaithiyalingam Shutthanandan ,&nbsp;Mark E. Bowden ,&nbsp;Mitra Taheri ,&nbsp;Heriberto Hernandez ,&nbsp;Venkateshkumar Prabhakaran ,&nbsp;Grant E. Johnson","doi":"10.1016/j.carbon.2025.120280","DOIUrl":"10.1016/j.carbon.2025.120280","url":null,"abstract":"<div><div>We utilized size fractionation along with ion adsorption and permeation measurements, microscopy and spectroscopy characterization, and theoretical calculations to understand the role of graphene oxide (GO) sheet size and functionality in metal ion separations, focusing on europium cations (Eu³⁺) as a model system. Our findings reveal that even though different-sized GO sheets exhibit subtle differences in their chemical and physical properties, adsorbents and membranes assembled from GO flakes of various sizes display size-dependent ion adsorption capacities and permeation rates. Specifically, GO adsorbents and membranes comprised of smaller ∼0.6 and 0.8 μm diameter GO sheets exhibit higher Eu³⁺ adsorption capacities and lower permeation rates compared to those assembled from larger ∼1.0 μm GO sheets. Detailed experimental analysis and theoretical simulations suggest that this phenomenon may be attributed to three competing factors: 1) a shift of the primary Eu³⁺ diffusion pathway from the horizontal interlayer transport channels between larger vertically stacked GO sheets to the more numerous vertical pores between smaller adjacent GO sheets in nearby planes, 2) Coulombic effects induced by strong electrostatic interactions between carboxylate groups (–COO^-) located at the edges of smaller GO sheets and Eu³⁺ cations, and 3) the different binding energies between specific oxygen functional groups on GO and Eu³⁺. Understanding the role of the dimensions and chemical functionality of GO sheets in determining selective ion adsorption and transport provides useful insight to guide the rational design of improved adsorbents and membranes, opening up new opportunities for the separation of critical materials, including rare-earth elements.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"239 ","pages":"Article 120280"},"PeriodicalIF":10.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848352","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}

{"title":"The stacking of graphene in a pseudocrystallite","authors":"Shaoqing Wang ,&nbsp;Jidun Sha ,&nbsp;Wenjia Lv ,&nbsp;Yixiu Zhang ,&nbsp;Xueqi Li ,&nbsp;Yuegang Tang ,&nbsp;James C. Hower ,&nbsp;David French ,&nbsp;Harold H. Schobert ,&nbsp;Xin Guo ,&nbsp;Shifeng Dai","doi":"10.1016/j.carbon.2025.120273","DOIUrl":"10.1016/j.carbon.2025.120273","url":null,"abstract":"<div><div>The diversity of carbon materials is fundamentally linked to their internal structure. However, the intrinsic attribute of the carbon structure in relation to the stacking order of graphene layers remains ambiguous. Our work focuses on the internal structure within stacked graphene layers, demonstrating the negative correlation between the (00<em>l</em>) interlayer spacing and the number of layers can be expressed by two simple exponential equations. Furthermore, we propose that graphene layers are generally stacked into a pseudocrystallite, in which the internal stacking order and spatial orientation codetermine the macroscopic characteristics of carbon structures. This perspective could provide a method for comprehending the stacking sequence within a layered carbon system.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"238 ","pages":"Article 120273"},"PeriodicalIF":10.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777088","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}

{"title":"Strengthening copper matrix composites by in situ synthesized amorphous carbon nanosheet reinforcements","authors":"Ying Liu ,&nbsp;Yupeng Yao ,&nbsp;Yanxia Wu ,&nbsp;Caili Zhang ,&nbsp;Lin Jing ,&nbsp;Songlin Cai","doi":"10.1016/j.carbon.2025.120275","DOIUrl":"10.1016/j.carbon.2025.120275","url":null,"abstract":"<div><div>Graphene-like carbon nanosheets with large specific surface areas present a great potential to enhance the mechanical properties of copper matrix composites. To achieve the homogeneous dispersion of nanosheet reinforcements in the copper matrix, in-situ synthesis strategies using solid carbon sources have been developed in recent years. However, the influence of in-situ synthesis factors on the microstructures of carbon nanosheets and the corresponding mechanical behaviors are far from clear. In this work, an amorphous carbon nanosheets reinforced copper matrix composite with significantly enhanced strength had been in-situ synthesized. The dependence of the microstructures and tensile mechanical properties of the composite on the amorphous carbon nanosheet concentration was investigated. The in-situ grown amorphous carbon nanosheets induced remarkably refined Cu grains and they could effectively bear the loads transferring from the matrix. Consequently, the copper matrix composite with 0.6 wt% amorphous carbon nanosheets showed the highest yield strength and ultimate tensile strength of 196.5 MPa and 306.4 MPa, respectively, which are 2.56 and 1.51 folds of the pure copper bulk. The strengthening mechanisms of the amorphous carbon nanosheets/Cu composite were further revealed through the microstructure characterizations and theoretical model analysis. The load transfer was considered as a dominant mechanism for the strengthening.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"238 ","pages":"Article 120275"},"PeriodicalIF":10.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768672","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}

{"title":"Carbon induced multiple interfaces and in-situ formed defects in oxidation of Co toward enhancing microwave absorption performances","authors":"Lin Xie ,&nbsp;Ruilin Liu ,&nbsp;Xiaomeng Jiang ,&nbsp;Cui Ni ,&nbsp;Baolei Wang ,&nbsp;Chuanxin Hou ,&nbsp;Di Lan ,&nbsp;Wei Du ,&nbsp;Xiubo Xie","doi":"10.1016/j.carbon.2025.120272","DOIUrl":"10.1016/j.carbon.2025.120272","url":null,"abstract":"<div><div>In order to obtain multiple interfaces of Co/CoO by tuning the oxidation process and simultaneously clarify the interface migration, Co particles loaded on mangosteen shell-derived carbon (MSC) were prepared, and then oxidized under a mixed atmosphere of Ar/O₂ and 300 °C with different oxidation time. Due to the existence of MSC, the Co can completely oxidized in short time of 60 min and low O₂ concentration of 5 %. The oxidation process is: Co→CoO→Co₃O₄. A lot of defects in-situ formed in the oxidation process can be clearly detectable. Co/MSC composites oxidized at 300 °C for 10 min exhibits considerable minimum reflection loss of −37.86 dB and an effective absorption bandwidth of 5.28 GHz among the composites with different oxidation times. The Co/CoO, CoO/C, Co/C heterogeneous interfaces are conducive to the depletion of electromagnetic waves through interfacial polarization. The in-situ formed defects are positive for enhancing the dipole prolarization, and the natural resonance is also enhanced due to the presence of Co and its oxides. The positive effects of carbon additive in the oxidation of Co on the in-situ defects formation and multiple interface construction provide a new perspective for designing high performance microwave absorption materials.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"238 ","pages":"Article 120272"},"PeriodicalIF":10.5,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-element synergy driven breakthrough in sodium storage performance of phenolic resin-based hard carbon","authors":"Yong Chen,&nbsp;Guangyong Peng,&nbsp;Min Zhao,&nbsp;Yuhan Zhou,&nbsp;Yi Zeng,&nbsp;HanBing He,&nbsp;Jing Zeng","doi":"10.1016/j.carbon.2025.120269","DOIUrl":"10.1016/j.carbon.2025.120269","url":null,"abstract":"<div><div>The inherent kinetic limitations of Na⁺ storage in hard carbon anodes plague the advancements in energy density for sodium-ion batteries. Conventional mono-heteroatom doping approaches, constrained by unilateral electronic modulation, fail to synergistically address the dual challenges of creating adsorption-active sites and enhancing ionic diffusion kinetics. Herein, the boron-phosphorus co-doped hard carbon microspheres (BPHCS) were synthesized through a copolymerization and crosslinking reaction. The combined effects of P–O and P–C bonds, along with boron compounds (BC₃, BC₂O, BCO₂) alter the microcrystalline structure of hard carbon, introduce additional Na⁺ storage sites, and establish the n/p-type heteroatom synergy, creating complementary electron-hole transport pathways in hard carbon. The BPHCS exhibited a reversible capacity of 344 mAh g⁻¹ at 0.05 A g⁻¹ and maintained 174 mAh g⁻¹ after 5000 cycles at 5 A g⁻¹, demonstrating superior rate performance and cycling stability. Furthermore, boron doping promotes the formation of graphite-like regions, enhancing the intercalation capability of Na⁺. GITT, ex-situ Raman, and XRD confirm that the sodium storage mechanism in hard carbon follows a \"surface adsorption, interlayer intercalation, and nanopore filling\" model.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"238 ","pages":"Article 120269"},"PeriodicalIF":10.5,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735276","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}

{"title":"Healing of a topological scar: Coordination defects in a honeycomb lattice","authors":"Benjamin N. Katz,&nbsp;Vincent Crespi","doi":"10.1016/j.carbon.2025.120193","DOIUrl":"10.1016/j.carbon.2025.120193","url":null,"abstract":"<div><div>A crystal structure with a point defect typically returns to its ideal local structure within a few bond lengths of the defect; topological defects such as dislocations or disclinations also heal rapidly in this regard. Here we describe a simple point defect – a two-fold atom incorporated at the growth edge of a honeycomb lattice – whose healing may require a defect complex spanning many atoms. <em>Topologically</em>, the two-fold atom disappears into a single “long bond” between its neighbors, thereby making a pentagonal disclination. But <em>chemically</em>, this disclination occupies as much physical space as a six-fold ring. This incompatibility of chemistry and topology can cause a damped oscillation of the Gaussian curvature that creates an expansive healing region, a topological scar.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"238 ","pages":"Article 120193"},"PeriodicalIF":10.5,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792055","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}

{"title":"The C@FeCo coaxial composite fibers with enhanced interface polarization and magnetic response toward outstanding electromagnetic wave absorption","authors":"Fulin Liang ,&nbsp;Lichao Zou ,&nbsp;Chao Peng ,&nbsp;Yue Zhuo ,&nbsp;Shaohong Shi ,&nbsp;Jiabin Chen","doi":"10.1016/j.carbon.2025.120271","DOIUrl":"10.1016/j.carbon.2025.120271","url":null,"abstract":"<div><div>One-dimensional (1D) carbon-magnetic coaxial composite fibers with remarkable morphological diversity and magnetic anisotropy are important for optimizing magnetic properties and electromagnetic responsiveness. It shows great advantages in promoting electromagnetic wave (EMW) absorption, but still faces challenges in revealing the intrinsic mechanism of coaxial fibrous structure in enhancing EMW absorption performance. Herein, the C@FeCo coaxial composite fibers (C@FeCo CCF) are prepared by a combination of coaxial electrospinning and carbonization thermal reduction method. The ferromagnetic fibers uniformly embedded into the core layer of the carbon fibers to form coaxial composite fibers, the coaxial fibrous structure introduces a multitude of heterogeneous interfaces, functional groups and defects, which significantly enriches the loss mechanism and improve the impedance matching, thereby improving the EMW absorbing performance. Ultimately, CCF-0.3 achieves a minimum reflection loss (RL) of -52.99 dB and an effective absorption bandwidth (EAB) of 6.57 GHz, which indicates that the coaxial fibers exhibit great EMW absorption. This coaxial structure facilitates a new perspective of the connection between the design of microstructure and electromagnetic characteristics in carbon fibers. Furthermore, it positions C@FeCo CCF as a highly competitive candidate for EMW absorbing applications.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"238 ","pages":"Article 120271"},"PeriodicalIF":10.5,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}