Diamond and Related Materials最新文献

Cu-Mo dual-doped carbon nitride with excellent peroxidase-like activity for portable colorimetric quantifying D-penicillamine 具有优异过氧化物酶样活性的Cu-Mo双掺杂氮化碳用于便携式比色法定量d -青霉胺

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-26 DOI: 10.1016/j.diamond.2026.113681

Xianfeng Ma , Huiying Dai , Luyao Zhao , Xiaolan Liang , Xiuquan Xu , Xiaofeng Yu

{"title":"Cu-Mo dual-doped carbon nitride with excellent peroxidase-like activity for portable colorimetric quantifying D-penicillamine","authors":"Xianfeng Ma , Huiying Dai , Luyao Zhao , Xiaolan Liang , Xiuquan Xu , Xiaofeng Yu","doi":"10.1016/j.diamond.2026.113681","DOIUrl":"10.1016/j.diamond.2026.113681","url":null,"abstract":"<div><div>D-Penicillamine (D-PA), a sulfur-containing amino acid, is used to treat various diseases such as Wilson's disease, fibrotic lung disease, and cystinuria. However, excessive intake of D-PA can cause adverse effects, necessitating the development of accurate quantitative detection methods. This study aimed to establish a visual colorimetric method for D-PA detection using a synthesized Cu-Mo dual-doped carbon nitride nanomaterial (<strong>Cu</strong>-<strong>Mo</strong>-<strong>VC</strong>-<strong>CN</strong>). The synthesis capitalizes on the simplicity and cost-effectiveness of a one-pot thermal polymerization reaction, utilizing only inexpensive and commercially available precursors, namely copper chloride, ammonium molybdate, urea, and vitamin C. The material exhibited exceptional peroxidase-like activity, catalyzing the oxidation of TMB by H<sub>2</sub>O<sub>2</sub> via a superoxide radical pathway. The optimal reaction conditions were: temperature 30 °C, time 30 min, pH 5.5, TMB concentration 0.2 mM, and H₂O₂ concentration 0.2 mM. Steady-state kinetic analysis revealed that the <strong>Cu</strong>-<strong>Mo</strong>-<strong>VC</strong>-<strong>CN</strong> nanozyme had Michaelis-Menten constants (<em>K</em>ₘ) of 0.083 mM for TMB and 0.603 mM for H<sub>2</sub>O<sub>2</sub>. Under optimal conditions, the system enabled highly sensitive D-PA quantification with a linear range of 0.5–100 μM and a detection limit of 0.45 μM. The nanozyme was successfully applied to determine D-PA content in pharmaceutical tablets with satisfactory recovery (from 97.73 to 98.27%). Furthermore, a smartphone-based testing platform was established to provide a portable and practical solution for the real-time monitoring of D-PA. This work provides both an efficient strategy for developing multi-metal-doped nanozymes and a reliable colorimetric platform for D-PA monitoring.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113681"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent developments in modified graphitic carbon nitride-based materials for electrochemical sensing of emerging contaminants and energy storage. A review 用于新兴污染物电化学传感和储能的改性石墨氮化碳基材料的最新进展。回顾

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-26 DOI: 10.1016/j.diamond.2026.113676

Cabangani Donga , Kholiswa Yokwana , Tau S. Ntelane , Rudzani Sigwadi , Luyanda L. Noto , Pontsho S. Mbule

{"title":"Recent developments in modified graphitic carbon nitride-based materials for electrochemical sensing of emerging contaminants and energy storage. A review","authors":"Cabangani Donga , Kholiswa Yokwana , Tau S. Ntelane , Rudzani Sigwadi , Luyanda L. Noto , Pontsho S. Mbule","doi":"10.1016/j.diamond.2026.113676","DOIUrl":"10.1016/j.diamond.2026.113676","url":null,"abstract":"<div><div>Graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>), a polymeric semiconductor with a graphite-like layered structure, has gained significant attention in electrochemical sensing and energy storage applications due to its large surface area, abundant active sites, metal-free nature, low cost, and simple synthesis. However, pristine g-C<sub>3</sub>N<sub>4</sub> suffers from poor electrical conductivity and significant irreversible capacity loss, which limit its practical performance. This review highlights recent advances in modification strategies aimed at improving the properties of g-C<sub>3</sub>N<sub>4</sub>-based materials for enhanced electrochemical detection of emerging pollutants and energy storage applications. Key approaches include heteroatom doping, defect engineering, heterojunction construction, and surface modification through various synthesis techniques. In addition, the review discusses current challenges and provides future perspectives for researchers exploring modified g-C<sub>3</sub>N<sub>4</sub> materials in electrochemical sensing and energy storage technologies.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113676"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of KOH, NaOH and temperature on annoni grass ash-derived few layer and sponge-like graphene studied by Raman spectroscopy 用拉曼光谱研究了KOH、NaOH和温度对羊草灰衍生的少层和海绵状石墨烯的影响

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-27 DOI: 10.1016/j.diamond.2026.113680

Roberta Q.B. da Rosa , Juliana A.P. de Figueiredo , Maximiliano J.M. Zapata , Patricia C. Azzi , Eduarda C. Trindade , Lizandro B. Reyna Zegarra , Jacson W. de Menezes , Chiara Valsecchi , Alessandro Girardi , Luis E.G. Armas

{"title":"Influence of KOH, NaOH and temperature on annoni grass ash-derived few layer and sponge-like graphene studied by Raman spectroscopy","authors":"Roberta Q.B. da Rosa , Juliana A.P. de Figueiredo , Maximiliano J.M. Zapata , Patricia C. Azzi , Eduarda C. Trindade , Lizandro B. Reyna Zegarra , Jacson W. de Menezes , Chiara Valsecchi , Alessandro Girardi , Luis E.G. Armas","doi":"10.1016/j.diamond.2026.113680","DOIUrl":"10.1016/j.diamond.2026.113680","url":null,"abstract":"<div><div>In this work, we report the influence of the chemical reagents potassium hydroxide (KOH), sodium hydroxide (NaOH) and temperature on the structural quality of graphene derived from annoni grass ash, by Raman spectroscopy. For this purpose, the annoni grass (AG) leaves were combusted at 400 °C for 60 min to obtain the annoni grass ash (AGA). For graphene production, the AGA was activated with KOH and NaOH at 800, 850 and 950 °C for 60 min. SEM images and Raman analysis revealed that when AGA is activated with KOH, few layer graphene (FLG) is produced, whereas activation with NaOH results in sponge-like graphene with lower structural disorder. On the other hand, 850 and 950 °C are the optimal temperatures for producing both FLG and sponge-like graphene using KOH and NaOH as activating agents. Disorder analysis, using the ratio between the integrated intensities of the D = DS + DA, G = GS + GA, DA, and GA bands (I<sub>D</sub>/I<sub>G</sub>, I<sub>DA</sub>/I<sub>GA</sub>), showed that sponge-like graphene exhibits lower disorder than FLG. Additionally, the I<sub>2D</sub>/I<sub>G</sub> ratios indicate that for sponge-like graphene, the number of layers decreases as the temperature increases. These results indicate that graphene production from AG biomass, an invasive weed of the agricultural fields, represents a promising route for converting an abundant and low-value residue into value-added carbon materials through a simple and cost-effective process.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113680"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving tribological performance of carbon fiber reinforced PTFE against titanium alloy: A DLC coating and polishing approach 提高碳纤维增强聚四氟乙烯对钛合金的摩擦学性能：DLC涂层和抛光方法

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-28 DOI: 10.1016/j.diamond.2026.113684

Duoxun Fang , Cuiyang Zhao , Peng Zhuo , Linmao Qian , Yang Wang , Lei Chen

{"title":"Improving tribological performance of carbon fiber reinforced PTFE against titanium alloy: A DLC coating and polishing approach","authors":"Duoxun Fang , Cuiyang Zhao , Peng Zhuo , Linmao Qian , Yang Wang , Lei Chen","doi":"10.1016/j.diamond.2026.113684","DOIUrl":"10.1016/j.diamond.2026.113684","url":null,"abstract":"<div><div>The poor wear resistance of carbon fiber-reinforced PTFE (CF-PTFE) composites remains a key issue when sliding against hard alloys in seals. This study introduces a synergistic surface engineering strategy combining titanium alloy (TC4) polishing with diamond-like carbon (DLC) coating deposition to mitigate CF-PTFE wear under lubrications. It was found that when the surface roughness (<em>S</em><sub>q</sub>) exceeds 100 nm, DLC solid lubricants not only fail to reduce friction but also lead to more severe material loss of CF-PTFE. In contrast, at a reduced <em>S</em><sub>q</sub> of ~20 nm, DLC deposition yields a friction coefficient nearly 3-fold lower and a reduction in the wear rate of CF-PTFE by approximately 60%. This improvement stems from effective suppression of abrasive wear, which is otherwise caused by inherent asperities on rough DLC or those generated on worn TC4 surfaces. The study offers a new perspective for enhancing the durability of soft sacrificial materials against hard counterface.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113684"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Abnormal transfer curve drift in hydrogen-terminated diamond metal-oxide-semiconductor field-effect transistors 端氢金刚石金属氧化物半导体场效应晶体管的异常传递曲线漂移

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-21 DOI: 10.1016/j.diamond.2026.113665

Chao Zhang , Feng Yang , Yingying Sun , Xiang Li , Yongbo Su , Yinghui Zhong , Chongxin Shan

{"title":"Abnormal transfer curve drift in hydrogen-terminated diamond metal-oxide-semiconductor field-effect transistors","authors":"Chao Zhang , Feng Yang , Yingying Sun , Xiang Li , Yongbo Su , Yinghui Zhong , Chongxin Shan","doi":"10.1016/j.diamond.2026.113665","DOIUrl":"10.1016/j.diamond.2026.113665","url":null,"abstract":"<div><div>In this letter, trapping effects in hydrogen-terminated diamond (H-diamond) metal-oxide-semiconductor field-effect transistors (MOSFETs) are investigated. Abnormal transfer curve drift phenomenon is identified in transfer characteristics of the device. The defect density within gate dielectrics is quantified through the utilization of capacitance-voltage (<em>C</em><img><em>V</em>) measurements, whereas the impact of defects on dynamic current behavior is assessed via pulsed current-voltage (<em>I</em>-<em>V</em>) characterization. The transfer curve drift originates from the trapping of charge carriers in the gate dielectric layer. This work reports on the first characterization of trap time constants and spatial locations in H-diamond MOSFET, employing the transient current method. Three traps in the H-diamond MOSFET exhibit time constants of approximately 0.16 s (DP<sub>1</sub>), 1 s (DP<sub>2</sub>), and 6.7 s (DP<sub>3</sub>). Among them, DP<sub>1</sub> and DP<sub>2</sub> reside within the gate dielectric, with DP<sub>3</sub> originating from the diamond layer. This letter results may lead to better applications in H-diamond MOSFETs.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113665"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing the rate capability of supercapacitor via electrospinning in conjunction with solvent evaporation 静电纺丝与溶剂蒸发相结合提高超级电容器的速率性能

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-28 DOI: 10.1016/j.diamond.2026.113682

Jinyong Huang , Jingxuan Huang , Xinquan Shen , Zhong Dai

{"title":"Enhancing the rate capability of supercapacitor via electrospinning in conjunction with solvent evaporation","authors":"Jinyong Huang , Jingxuan Huang , Xinquan Shen , Zhong Dai","doi":"10.1016/j.diamond.2026.113682","DOIUrl":"10.1016/j.diamond.2026.113682","url":null,"abstract":"<div><div>Lignin is a promising low-cost, widely available precursor for supercapacitor electrodes, yet conventional preparation methods yield carbons with limited pore structures and poor ion transport, hampering rate performance. Herein, we develop a green strategy combining electrospinning and solvent evaporation, using lignin and cellulose acetate as precursors. Through synergistic multi-solvent volatilization, we fabricate all-bio-based hierarchically porous carbon nanofibers. The lignin-to-cellulose acetate ratio significantly impacts fiber morphology, pore structure, and electrochemical properties. At an optimal 8:2 ratio, the resultant material (PCF-2) possesses a micro-meso-macroporous architecture, with a specific surface area of 306 m<sup>2</sup> g<sup>-1</sup> and a pore volume of 0.1516 m<sup>3</sup> g<sup>-1</sup>. As an electrode, the ion diffusion coefficient of PCF-2 has increased by four times compared to the unmodified electrodes. Hence, the PCF-2 delivers a specific capacitance of 288 F g<sup>−1</sup> at 0.5 A g<sup>−1</sup> and retaining over 84% capacitance at 5 A g<sup>−1</sup>, demonstrating excellent rate capability. A symmetric PCF-2//PCF-2 supercapacitor achieves an energy density of 27.54 Wh kg<sup>−1</sup> at 400 W kg<sup>−1</sup> and maintains 91.8% capacitance after 10,000 cycles. This work offers a novel approach for high-performance, high-rate lignin-based supercapacitors.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113682"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pr6O11-doped graphitic carbon nitride composites for photodegradation of methylene blue and photoreduction of chromium (VI): Synthesis, characterization, performance, and mechanism 用于光降解亚甲基蓝和光还原铬的掺杂石墨氮化碳复合材料（VI）：合成、表征、性能和机理

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-13 DOI: 10.1016/j.diamond.2026.113624

Tran Nguyen Cam Nhung , Dang Thanh Cong Minh , Tran Dang Khoa , Nguyen Huu Hieu

{"title":"Pr6O11-doped graphitic carbon nitride composites for photodegradation of methylene blue and photoreduction of chromium (VI): Synthesis, characterization, performance, and mechanism","authors":"Tran Nguyen Cam Nhung , Dang Thanh Cong Minh , Tran Dang Khoa , Nguyen Huu Hieu","doi":"10.1016/j.diamond.2026.113624","DOIUrl":"10.1016/j.diamond.2026.113624","url":null,"abstract":"<div><div>In this study, Pr<sub>6</sub>O<sub>11</sub>/g-C<sub>3</sub>N<sub>4</sub> (PrCN) composites were successfully synthesized via calcination and ultrasonication. A comprehensive set of characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), high-resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), UV–Vis spectroscopy, photoluminescence (PL) spectra, X-ray photoelectron spectroscopic analysis (XPS), and Fourier transform infrared spectroscopy (FTIR) were employed to investigate the structural, morphological, and optical properties of the composites. The band gap values were significantly reduced, measured at 2.40, 2.15, and 2.08 eV for 5PrCN, 10PrCN, and 15PrCN, respectively. The photocatalytic performance was assessed by the degradation of methylene blue (MB) dye, achieving a removal efficiency of up to 95%, and Cr(VI) reduction with an efficiency exceeding 92%, within a short illumination period of 180 min. The synthesized 10PrCN composite exhibits excellent stability, maintaining high photocatalytic performance over four consecutive cycles for MB degradation and Cr(VI) reduction. The hydroxyl groups adsorbed on the surface are oxidized by photo-generated holes to produce <img>OH radicals, while photo-generated electrons can be captured by adsorbed O<sub>2</sub>, leading to the formation of <img>O<sub>2</sub><sup>−</sup> radicals. Both <img>OH and <img>O<sub>2</sub><sup>−</sup> radicals play essential roles in the photocatalytic degradation of MB and the reduction of Cr(VI). This research provides valuable insights into highly reactive photocatalytic composites, contributing to the global body of knowledge and promoting the sustainable development of photocatalytic materials for addressing environmental challenges.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113624"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrafast electron cooling in Ti3C2Tx MXene revealed by time-resolved photoemission spectroscopy 时间分辨光谱学研究Ti3C2Tx MXene的超快电子冷却

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-30 DOI: 10.1016/j.diamond.2026.113690

Jurij Urbančič , Fyodor Malchik , Kaiyrgali Zhumadil , Gian Marco Pierantozzi , Monika Schied , Sara Dottorini , Riccardo Cucini , Pietro Parisse , Giorgio Rossi , Rokaya Osama , Lakshmi Rajan , Egon Pavlica , Barbara Ressel

{"title":"Ultrafast electron cooling in Ti3C2Tx MXene revealed by time-resolved photoemission spectroscopy","authors":"Jurij Urbančič , Fyodor Malchik , Kaiyrgali Zhumadil , Gian Marco Pierantozzi , Monika Schied , Sara Dottorini , Riccardo Cucini , Pietro Parisse , Giorgio Rossi , Rokaya Osama , Lakshmi Rajan , Egon Pavlica , Barbara Ressel","doi":"10.1016/j.diamond.2026.113690","DOIUrl":"10.1016/j.diamond.2026.113690","url":null,"abstract":"<div><div>Ultrafast electron dynamics in a Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene thin film (where T<sub>x</sub> denotes surface terminations) were investigated using time-resolved photoemission spectroscopy with temporal resolution of 110 fs. Near-infrared optical excitation at 800 nm induces a transient redistribution of electronic states in the vicinity of the Fermi level, which is directly probed using extreme-ultraviolet (26.5 eV) pulses. The measured signal reveals a rapid modification of the electronic distribution immediately after excitation, followed by relaxation on sub-0.5 ps timescales, as quantified by the evolution of the electronic temperature. These results provide direct insight into hot-electron lifetimes and open the study of relaxation pathways in MXene thin films, establishing a framework for further understanding and optimizing their performance.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113690"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Expansion of graphite via HClO4 intercalation: The negative size effect 石墨经HClO4插层膨胀：负尺寸效应

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-23 DOI: 10.1016/j.diamond.2026.113656

Li-bo Wang , Liangfeng Chen , Yupeng Lan , Haolong Zheng , Hang Wang , Shujing Yang , Peng He , Siwei Yang , Guqiao Ding

{"title":"Expansion of graphite via HClO4 intercalation: The negative size effect","authors":"Li-bo Wang , Liangfeng Chen , Yupeng Lan , Haolong Zheng , Hang Wang , Shujing Yang , Peng He , Siwei Yang , Guqiao Ding","doi":"10.1016/j.diamond.2026.113656","DOIUrl":"10.1016/j.diamond.2026.113656","url":null,"abstract":"<div><div>Insufficient understanding of intercalation and expansion mechanisms has hindered the development of graphite intercalation and exfoliation by using perchloric acid (HClO<sub>4</sub>). Here, we reported a distinct negative size effect during the HClO<sub>4</sub> intercalation of graphite, which differs from other common graphite intercalation systems (e.g., lithium-ion electrochemical intercalation and halogen intercalation). Influenced by this effect, larger graphite flakes exhibit superior performance compared to smaller ones, specifically regarding their intercalation stage and the quantity of intercalated species. We demonstrate that ClO<sub>2</sub> intermediates, generated during the process, are responsible for this negative size effect. This distinct intercalation behavior further determines the subsequent thermal expansion of the obtained graphite intercalation compounds. By elucidating these mechanisms, we can objectively evaluate the effectiveness of using HClO<sub>4</sub> as a standalone reagent and provide a rational framework for optimizing expanded graphite production as a precursor for subsequent graphene preparation.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113656"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Penta-C52: A semimetallic carbon allotrope with a topological nodal loop Penta-C52：具有拓扑节点环的半金属碳同素异形体

IF 5.1 3区材料科学

Diamond and Related Materials Pub Date : 2026-05-01 Epub Date: 2026-04-23 DOI: 10.1016/j.diamond.2026.113673

Yanxing Song , Wei Zhang , Ying Wang , Wanzhao Cui

{"title":"Penta-C52: A semimetallic carbon allotrope with a topological nodal loop","authors":"Yanxing Song , Wei Zhang , Ying Wang , Wanzhao Cui","doi":"10.1016/j.diamond.2026.113673","DOIUrl":"10.1016/j.diamond.2026.113673","url":null,"abstract":"<div><div>Carbon allotropes with topological semimetallic properties, exemplified by graphene, have attracted widespread attention due to their remarkable physical and chemical properties. In this work, inspired by molecular precursor strategies for carbon allotrope synthesis, we propose a novel three-dimensional sp<sup>2</sup>–sp<sup>3</sup> hybrid carbon allotrope, denoted as Penta-C<sub>52</sub>, constructed from the [5.5.5.5]fenestratetraene precursor. First-principles calculations based on density functional theory (DFT) were carried out to explore the structural, electronic, and mechanical properties of Penta-C<sub>52</sub>. Our results reveal that Penta-C<sub>52</sub> is a topological semimetal, hosting nodal ring features at the Fermi level. Notably, its Fermi velocity reaches the order of 10<sup>5</sup> m/s, comparable to that of graphene. From a mechanical perspective, Penta-C<sub>52</sub> exhibits pronounced anisotropy. Its thermodynamic and dynamic stability is confirmed through cohesive energy analysis, full phonon spectrum calculations, and ab initio molecular dynamics simulations. Moreover, Penta-C<sub>52</sub> demonstrates a clear energetic advantage over most previously reported topological semimetallic carbon allotropes. This study provides new insights and design strategies for the development of topological semimetallic carbon-based materials.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"165 ","pages":"Article 113673"},"PeriodicalIF":5.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0