Carbon Letters最新文献_第5页

Modulating the thermophysical properties of diamond/SiC composites via controlling the diamond graphitization 通过控制金刚石石墨化来调节金刚石/碳化硅复合材料的热物理性质

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-27 DOI: 10.1007/s42823-024-00767-5

Xulei Wang, Yikang Li, Yabo Huang, Yalong Zhang, Pei Wang, Li Guan, Xinbo He, Rongjun Liu, Xuanhui Qu, Xiaoge Wu

{"title":"Modulating the thermophysical properties of diamond/SiC composites via controlling the diamond graphitization","authors":"Xulei Wang, Yikang Li, Yabo Huang, Yalong Zhang, Pei Wang, Li Guan, Xinbo He, Rongjun Liu, Xuanhui Qu, Xiaoge Wu","doi":"10.1007/s42823-024-00767-5","DOIUrl":"10.1007/s42823-024-00767-5","url":null,"abstract":"<div><p>Diamond/SiC composites were prepared by vacuum silica vapor-phase infiltration of in situ silicon–carbon reaction, and the thermophysical properties of the composites were modulated by controlling diamond graphitizing. The effects of diamond surface state and vacuum silicon infiltration temperature on diamond graphitization were investigated, and the micro-morphology, phase composition, and properties of the composites were observed and characterized. The results show that diamond pretreatment can reduce the probability of graphitizing; when the penetration temperature is greater than 1600 °C, the diamond undergoes a graphitizing phase transition and the micro-morphology presents a lamellar shape. The thermal conductivity, density, and flexural strength of the composites increased and then decreased with the increase of penetration temperature in the experimentally designed range of penetration temperature. The variation of thermal expansion coefficients of composites prepared with different penetration temperatures ranged from 0.8 to 3.0 ppm/K when the temperature was between 50 and 400 °C.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"34 9","pages":"2377 - 2388"},"PeriodicalIF":5.5,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509307","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

Effect of NH3 addition on the preparation of nitrogen-doped carbon nanomaterials by flame synthesis method 添加 NH3 对火焰合成法制备掺氮碳纳米材料的影响

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-27 DOI: 10.1007/s42823-024-00760-y

Hui Zhou, Yuhang Yang, Fen Qiao, Run Hong, Hanfang Zhang, Huaqiang Chu

{"title":"Effect of NH3 addition on the preparation of nitrogen-doped carbon nanomaterials by flame synthesis method","authors":"Hui Zhou, Yuhang Yang, Fen Qiao, Run Hong, Hanfang Zhang, Huaqiang Chu","doi":"10.1007/s42823-024-00760-y","DOIUrl":"10.1007/s42823-024-00760-y","url":null,"abstract":"<div><p>Nitrogen-doped carbon nanomaterials (N-CNMs) were prepared using Ni(NO<sub>3</sub>)<sub>2</sub> as a catalyst in the laminar diffusion flame. Doping the structure of carbon nanomaterials (CNMs) with nitrogen can significantly change the characteristics of CNMs. The purpose of this research is to study the effect of adding ammonia (NH<sub>3</sub>) on the evolution of CNMs structure in the laminar flame of ethylene. Raman analysis shows that the intensity ratio (I<sub>D</sub>/I<sub>G</sub>) of the D-band and G-band of N-CNMs increases and then decreases after the addition of NH<sub>3</sub>. The intensity ratio is a maximum of 0.99, which has a good degree of disorder and defect density. The binding distribution of nitrogen was analyzed by X-ray photoelectron spectroscopy (XPS), and a correlation was found between the amount of nitrogen and the morphology of N-CNMs. Nitrogen atoms predominantly present in the forms of pyrrolic-N, pyridinic-N, graphitized-N and oxidized-N, with a doping ratio of nitrogen atoms reaching up to 2.44 at.%. This study found that smaller nickel (Ni) nanoparticles were the main catalysts for carbon nanotubes (CNTs), and their synthesis followed the ‘hollow growth mechanism’ and carbon nanofibers (CNFs) were synthesized from larger Ni nanoparticles according to the ‘solid growth mechanism’. Furthermore, a growth mechanism for the synthesis of bamboo-like CNTs using a specific particle size of the Ni catalyst is proposed. It is noteworthy that the synthesis and modulation of high-performance N-CNMs by flame method represents a simple and efficient approach.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"34 9","pages":"2343 - 2355"},"PeriodicalIF":5.5,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509306","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

Correction to: A study on the development of C-dots via green chemistry: a state-of-the-art review 更正为通过绿色化学开发 C 点的研究：最新进展综述

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-27 DOI: 10.1007/s42823-024-00764-8

Nazia Tarannum, Km. Pooja, Manvi Singh, Anurag Panwar

引用次数: 0

Correction to: Revealing the effect of graphite source on the properties of synthesized graphene oxide 更正为揭示石墨源对合成氧化石墨烯特性的影响

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-24 DOI: 10.1007/s42823-024-00765-7

Yulia Ioni, Timur Khamidullin, Ivan Sapkov, Vasiliy Brusko, Ayrat M. Dimiev

引用次数: 0

A bifunctional nanocomposite of hybrid quaternary nanocomposite as electrodes for an integrated Pt-free DSSC powered supercapacitor–photosupercapacitor 一种用作无铂 DSSC 供电超级电容器-光电超级电容器集成电极的双功能混合季纳米复合材料

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-23 DOI: 10.1007/s42823-024-00762-w

Joselene Suzan Jennifer Patrick, Niranjana Subrayapillai Ramakrishna, Muthupandi Sankar, Dinesh Ayyar, Madhavan Joseph, Victor Antony Raj Moses, Malarkodi Ammavasi, Manikandan Ayyar

{"title":"A bifunctional nanocomposite of hybrid quaternary nanocomposite as electrodes for an integrated Pt-free DSSC powered supercapacitor–photosupercapacitor","authors":"Joselene Suzan Jennifer Patrick, Niranjana Subrayapillai Ramakrishna, Muthupandi Sankar, Dinesh Ayyar, Madhavan Joseph, Victor Antony Raj Moses, Malarkodi Ammavasi, Manikandan Ayyar","doi":"10.1007/s42823-024-00762-w","DOIUrl":"10.1007/s42823-024-00762-w","url":null,"abstract":"<div><p>Graphene-based solar cells and supercapacitors integrated into photosupercapacitors represent a pioneering advancement. These devices leverage the exceptional properties of graphene, such as high conductivity and large surface area, to enhance both solar energy conversion and energy storage. The integration of these technologies into photosupercapacitors creates a multifunctional device capable of harnessing solar energy and storing it efficiently. This innovative approach holds promise for sustainable and versatile energy solutions, marking a significant step towards developing efficient and compact energy storage systems. This integration addresses the intermittent nature of solar power generation by providing a continuous and reliable power supply through energy storage. Supercapacitors are one such energy device with a high-power density and excellent specific capacitance which is integrated will a dye-sensitized solar cell (DSSC) comprising a single system of photosupercapacitor. A novel electrode material of NiO/CuO/Co<sub>3</sub>O<sub>4</sub>/rGO was synthesized which serves as the Pt-free counter electrode of DSSC and working or storage electrode of supercapacitor later was used as the intermediate electrode and storage electrode of a photosupercapacitor. The integrated photosupercapacitor device had a photovoltage of 0.81 V with areal-specific capacitance, energy and power density of 190.12 mF cm<sup>−2</sup>, 17.325 μW h cm<sup>−2</sup> and 0.162 mW cm<sup>−2</sup>, respectively. The device self-discharged in 385 s with an overall conversion efficiency of 2.17%, resulting in a self-charged energy device.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"34 9","pages":"2357 - 2367"},"PeriodicalIF":5.5,"publicationDate":"2024-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509308","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

Coal-derived fluorescent carbon quantum dots for sensitive and selective detection of Cu2+ and Fe3+ 用于灵敏和选择性检测 Cu2+ 和 Fe3+ 的煤衍生荧光碳量子点

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-18 DOI: 10.1007/s42823-024-00763-9

Xiyu Zhao, Yuqi Han, Xiangwen Miao, Xingmei You, Cheng Cao

引用次数: 0

Effects of supercritical-CO2 treatment on the pore structure and H2 adsorptivity of single-walled carbon nanohorns 超临界二氧化碳处理对单壁纳米碳角孔隙结构和 H2 吸附性的影响

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-15 DOI: 10.1007/s42823-024-00757-7

Nam Ryeol Kim, Jae-Hyung Wee, Chang Hyo Kim, Dong Young Kim, Katsumi Kaneko, Cheol-Min Yang

{"title":"Effects of supercritical-CO2 treatment on the pore structure and H2 adsorptivity of single-walled carbon nanohorns","authors":"Nam Ryeol Kim, Jae-Hyung Wee, Chang Hyo Kim, Dong Young Kim, Katsumi Kaneko, Cheol-Min Yang","doi":"10.1007/s42823-024-00757-7","DOIUrl":"10.1007/s42823-024-00757-7","url":null,"abstract":"<div><p>We investigated the effects of supercritical-CO<sub>2</sub> treatment on the pore structure and consequent H<sub>2</sub> adsorption behavior of single-walled carbon nanohorns (SWCNHs) and SWCNH aggregates. High-resolution transmission electron microscopy and adsorption characterization techniques were employed to elucidate the alterations in the SWCNH morphology and aggregate pore characteristics induced by supercritical-CO<sub>2</sub> treatment. Our results confirm that supercritical-CO<sub>2</sub> treatment reduces the interstitial pore surface area and volume of SWCNH aggregates, notably affecting the adsorption of N<sub>2</sub> (77 K), CO<sub>2</sub> (273 K), and H<sub>2</sub> (77 K) gasses. The interstitial porosity strongly depends on the supercritical-CO<sub>2</sub> pressure. Supercritical-CO<sub>2</sub> treatment softens the individual SWCNHs and opens the core of SWCNH aggregates, producing a partially orientated structure with interstitial ultramicropores. These nanopores are formed by the diffusion and intercalation of CO<sub>2</sub> molecules during treatment. An increase in the amount of H<sub>2</sub> adsorbed per interstitial micropore of the supercritically modified SWCNHs was observed. Moreover, the increase in the number and volume of ultramicropores enable the selective adsorption of H<sub>2</sub> and CO<sub>2</sub> molecules. This study reveals that supercritical-CO<sub>2</sub> treatment can modulate the pore structure of SWCNH aggregates and provides an effective strategy for tailoring the H<sub>2</sub> adsorption properties of nanomaterials.</p></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"34 9","pages":"2317 - 2323"},"PeriodicalIF":5.5,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337046","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

Evolution of the understanding of quantum capacitance through advancements in graphene-related carbon materials 通过石墨烯相关碳材料的进步加深对量子电容的理解

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-13 DOI: 10.1007/s42823-024-00761-x

Rui Tang

引用次数: 0

N-, P-co-doped hierarchically porous carbon fiber derived from bamboo pulp as efficient carbocatalyst for reduction of 4-nitrophenol 竹浆衍生的掺杂 N、P 的分层多孔碳纤维作为还原 4-硝基苯酚的高效碳催化剂

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-12 DOI: 10.1007/s42823-024-00758-6

Liyun Zhang, Weihai Zhou, Yongle Cao, Heng Zhang, Wancheng Zhu

{"title":"N-, P-co-doped hierarchically porous carbon fiber derived from bamboo pulp as efficient carbocatalyst for reduction of 4-nitrophenol","authors":"Liyun Zhang, Weihai Zhou, Yongle Cao, Heng Zhang, Wancheng Zhu","doi":"10.1007/s42823-024-00758-6","DOIUrl":"10.1007/s42823-024-00758-6","url":null,"abstract":"<div><p>For metal-free carbocatalysts, heteroatom doping and hierarchically porous structure are the significant factors to improve their catalytic performances. Herein, N-, P-co-doped hierarchically porous carbon fiber (NPC–2–800) was prepared by pyrolyzing bamboo pulp in combination with (NH<sub>4</sub>)<sub>2</sub>HPO<sub>4</sub> and activator K<sub>2</sub>CO<sub>3</sub>. It was found that (NH<sub>4</sub>)<sub>2</sub>HPO<sub>4</sub> not only provides N and P atoms, but also significantly affect the morphology and pore structure of the porous carbon. An appropriate dosage of (NH<sub>4</sub>)<sub>2</sub>HPO<sub>4</sub> facilitates the formation of hierarchically porous carbon fiber in NPC-2–800. Whereas, the carbon fragments with only micropores were obtained in absence of (NH<sub>4</sub>)<sub>2</sub>HPO<sub>4</sub>. The hierarchical porosity and the co-doping of N and P atoms in the NPC-2–800 contribute to its outstanding catalytic performances in the 4-Nitrophenol (4-NP) reduction assisted by NaBH<sub>4</sub>. The NPC-2–800 exhibits an attractive turnover frequency (TOF) value of 4.29 × 10<sup>–4</sup> mmol mg<sup>−1</sup> min<sup>−1</sup>, a low activation energy (<i>E</i><sub>a</sub>) of 24.76 kJ/mol, and an acceptable recyclability for 7 cycles without obvious decrease in activity. Kinetics analyses suggest that the 4-NP reduction proceeds through the Langmuir–Hinshelwood model. In addition, the NPC-2–800 can also efficiently catalyze the 2-NP and 3-NP reduction. Moreover, in the real water body, the NPC-2–800 also showed superior catalytic activity to catalyze 4-NP reduction. This study provides an efficient catalyst for pollutant conversion and elimination as well as guidelines for designing versatile carbon-based catalysts.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"34 8","pages":"2137 - 2148"},"PeriodicalIF":5.5,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141354385","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

Simultaneous electrochemical detection of ascorbic acid, dopamine and uric acid using Au decorated carbon nanofibers modified screen printed electrode 使用金修饰碳纳米纤维改性丝网印刷电极同时电化学检测抗坏血酸、多巴胺和尿酸

IF 5.5 3区材料科学

Carbon Letters Pub Date : 2024-06-11 DOI: 10.1007/s42823-024-00759-5

P. Sakthivel, K. Ramachandran, K. Maheshvaran, T. S. Senthil, P. Manivel

{"title":"Simultaneous electrochemical detection of ascorbic acid, dopamine and uric acid using Au decorated carbon nanofibers modified screen printed electrode","authors":"P. Sakthivel, K. Ramachandran, K. Maheshvaran, T. S. Senthil, P. Manivel","doi":"10.1007/s42823-024-00759-5","DOIUrl":"10.1007/s42823-024-00759-5","url":null,"abstract":"<div><p>Gold nanoparticles (Au NPs) decorated carbon nanofibers (CNFs) have been prepared by an electrospinning approach and then carbonized. The prepared Au-CNFs were employed to modifying a screen printed electrode (SPE) for simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA). Au NPs are uniformly dispersed on carbon nanofibers were confirmed by the structure and morphological studies. The modified electrodes were tested in cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CA) to characterize their electrochemical responses. Compared to bare SPE, the Au-CNFs/SPE had a better sensing response to AA, DA, and UA. The electrochemical oxidation signal of AA, DA and UA are well separated into three distinct peaks with peak potential separation of 280 mV, 159 mV and 439 mV between AA-DA, DA-UA and AA-UA respectively in CV studies and the corresponding peak potential separation in DPV studies are 290 mV, 166 mV and 456 mV. The Au-CNFs/SPE has a wide linear response of AA, DA and UA in DPV analysis over the range of 5–40 µM (R<sup>2</sup> = 0.9984), 2–16 µM (R<sup>2</sup> = 0.9962) and 2–16 µM (R<sup>2</sup> = 0.9983) with corresponding detection limits of 0.9 µM, 0.4 µM and 0.3 µM at S/N = 3, respectively. The developed modified SPE based sensor exhibits excellent reproducibility, stability, and repeatability. The excellent sensing response of Au-CNFs could reveal to a promising approach in electrochemical sensor.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"34 9","pages":"2325 - 2341"},"PeriodicalIF":5.5,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141357270","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