Journal of Materials Chemistry C最新文献

{"title":"Composition and microstructural control of Sm2Fe17N3 powders: a promising candidate for next-generation permanent magnets","authors":"Junjie Xu, Yuhao Yi, Boqian Jia, Hang Xue, Guang Tian, Zhenhui Ma and Yanglong Hou","doi":"10.1039/D4TC02797C","DOIUrl":"10.1039/D4TC02797C","url":null,"abstract":"<p >Sm<small>₂</small>Fe<small>₁₇</small>N<small>₃</small> powders have drawn much attention in both fundamental research and industrial applications due to their excellent magnetic properties. The magnetic properties of Sm<small>₂</small>Fe<small>₁₇</small>N<small>₃</small> powders mainly depend on the composition and microstructure. Herein, the intrinsic and extrinsic magnetic properties of Sm<small>₂</small>Fe<small>₁₇</small>N<small>₃</small> powders are introduced, where the correlation between the composition, microstructure, and magnetic properties is discussed. Based on the correlation, we provide a detailed description of the synthesis methods and regulation strategies for Sm<small>₂</small>Fe<small>₁₇</small>N<small>₃</small> powders, aiming to promote the design and preparation of Sm<small>₂</small>Fe<small>₁₇</small>N<small>₃</small> powders with better magnetic properties.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221539","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":"Benzobisthiazole unit in 4,8-connection mode to build D–A polymer donors achieving high short-circuit current density for organic solar cells","authors":"Chun Wang, Yajing Zhang, Heng Liu, Cheng Zhong, Xinhui Lu, Xiaowei Zhan, Xingguo Chen","doi":"10.1039/d4tc02746a","DOIUrl":"https://doi.org/10.1039/d4tc02746a","url":null,"abstract":"In this work, a series of D–A conjugated polymer donors (namely <strong>PBDT-BBTH</strong>, <strong>PBDT-BBTF</strong> and <strong>PBDT-BBTCl</strong>) was designed based on the benzobisthiazole (BBT) unit in the 4,8-connection mode with the benzodithiophene (BDT) unit linked by the thiophene π-bridge. At the same time, an α-alkyl-thiophene ring with different β-atoms (H, F and Cl) was introduced at 2,6-positions of the BBT unit as a side-chain to extend the conjugation and regulate the energy levels. In 4,8-connection mode, the aromatic fused-thiazole ring of the BBT unit can stabilize the quinoid configuration of the main chain to strengthen the intramolecular charge transfer (ICT) and improve the π-electron delocalization of the conjugated backbone. The DFT calculations indicate that there exists the N⋯S noncovalent interaction between the BBT unit and the adjacent thiophene π-bridge that can lock the main-chain conformation to enhance the rigidity of the conjugated backbone. Thus, these polymers exhibit strong absorption in the range of 300–650 nm, which is favorable for light-harvesting to improve the short-circuit current density (<em>J</em><small>_SC</small>) of the organic solar cells (OSCs). In addition, the introduction of a strongly electronegative F or Cl atom at the β-position of the α-alkyl-thiophene side-chain can reduce the HOMO energy level, which is beneficial for the enhancement of the open-circuit voltage (<em>V</em><small>_OC</small>). Finally, the optimized OSC devices based on these polymers with an L8-BO acceptor exhibit good <em>J</em><small>_SC</small> over 22 mA cm<small>⁻²</small>, and the devices based on <strong>PBDT-BBTF</strong> and <strong>PBDT-BBTCl</strong> show higher <em>V</em><small>_OC</small> than the device based on <strong>PBDT-BBTH</strong>. Among these polymers, the <strong>PBDT-BBTF</strong>-based device achieves more balanced parameters (<em>J</em><small>_SC</small> = 23.43 mA cm<small>⁻²</small>, <em>V</em><small>_OC</small> = 0.831 V, and FF = 73.36%) to lead to the best PCE of 14.27%.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221541","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":"CoNi-bimetallic coordination polymers as catalyst for boosting oxygen evolution reaction activity","authors":"Jia Du, Xueguo Liu, Meng Guo, Bingke Li, Hongyong Ye, Lixuan Chen","doi":"10.1039/d4tc02996h","DOIUrl":"https://doi.org/10.1039/d4tc02996h","url":null,"abstract":"Suitable coordination polymers (CPs) have significant promise for use in the realm of electrocatalysis due to their conceivable composition and structure. It poses a significant challenge to utilize coordination polymers as electrocatalysts for the oxygen evolution reaction (OER) owing to their limited catalytic efficiency and the inherent instability observed in current electrocatalysts. This study effectively constructed one-dimensional Co<small>_<em>x</em></small>Ni<small>_{1−<em>x</em>}</small>–CAs with dual active sites utilizing a mixed metal method and examined its potential as an OER electrocatalyst. Adjusting the metal ratio of Co<small>_<em>x</em></small>Ni<small>_{1−<em>x</em>}</small>–CAs can efficiently modulate the OER performance. After optimization, Co<small>_1/2</small>Ni<small>_1/2</small>–CA had the lowest reaction activation energy of 19.91 kJ mol<small>⁻¹</small> at 25 °C and a high overpotential of 349 mV at 10 mA cm<small>⁻²</small>. Furthermore, at 55 °C, Co<small>_1/2</small>Ni<small>_1/2</small>–CA demonstrated a significant overpotential of 308 mV at 10 mA cm<small>⁻²</small>. This mixed metal strategy offers a practical approach to enhancing OER electrocatalytic performance, which can be accomplished by varying the electronic state.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221536","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":"High-performance multilevel nonvolatile organic field-effect transistor memory based on multilayer organic semiconductor heterostructures","authors":"Yangzhou Qian, Jiayu Li, Wen Li, Ziyi Song, Hao Yu, Ziyi Feng, Wei Shi, Wei Huang, Mingdong Yi","doi":"10.1039/d4tc02842b","DOIUrl":"https://doi.org/10.1039/d4tc02842b","url":null,"abstract":"Nonvolatile organic field-effect transistor (OFET) memory devices have great potential for next-generation memory due to their advantages of low cost, light weight, mechanical flexibility and easy processing. However, addressing the issue of limited data storage capacity remains a critical challenge. In this study, we propose a multilevel nonvolatile OFET memory device featuring five-layer organic semiconductor heterostructures composed of pentacene and <em>N</em>,<em>N</em>′-ditridecylperylene-3,4,9,10-tetracarb-oxylic diimide (P13). The innovative semiconductor heterostructures exhibit quantum well-like characteristics, and efficiently function as charge trapping sites. These characteristics synergize with the charge trapping properties of the polystyrene (PS) layer, resulting in a significant enhancement of the device's charge storage capacity. The organic semiconductor heterostructure-based memory device demonstrates exceptional nonvolatile memory properties, including a large charge storage capacity (5.48 × 10<small>¹²</small> cm<small>⁻²</small>), a high mobility (2.06 cm<small>²</small> V<small>⁻¹</small> s<small>⁻¹</small>), a high ON/OFF current ratio (10<small>⁵</small>), and a long data retention (over 10<small>⁴</small> s). Moreover, a four-level data storage was achieved owing to the device's high charge capacity properties, significantly augmenting memory capacity. This research presents a promising methodology for the realization of high-performance organic memory for future technology.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221567","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":"Enhanced light-emitting transistors utilizing multi-dimensional CsPbBr3 perovskite films and PVP-modified ZTO semiconductor layers†","authors":"Xingyu Zhang, Min Guo, Jia Li, Bo Song, Fanwen Meng, Zitong Wang, Zhidong Lou, Yanbing Hou, Yufeng Hu and Feng Teng","doi":"10.1039/D4TC03440F","DOIUrl":"10.1039/D4TC03440F","url":null,"abstract":"<p >Light-emitting transistors (LETs) uniquely combine the electroluminescent features of LEDs with the switching capabilities of field-effect transistors, offering promising applications in advanced display technology, lighting, electrically pumped lasers, and optical communication systems. This study reports on the fabrication and performance of perovskite light-emitting transistors (PeLETs) using solution-processed CsPbBr<small>₃</small> thin films, enhanced with phenethylammonium bromide (PEABr) and polyethylene oxide (PEO) to create a multi-dimensional mixed phase with a quantum well structure, characterized by a reduced presence of low-dimensional phases and an increased proportion of high-dimensional phases, thereby enhancing exciton recombination efficiency. The incorporation of high-mobility zinc tin oxide (ZTO) films as channel and electron transport layers is investigated. Direct contact between the perovskite and ZTO layers initially leads to an increased off-state current and degraded electrical characteristics of ZTO field-effect transistors (FETs). However, introducing polyvinylpyrrolidone (PVP) as a modification layer significantly improves these characteristics, resulting in a more uniform electric field distribution and consistent surface emission under coplanar electrodes. The optimized PeLET demonstrates mobility of 0.73 cm<small>²</small> V<small>⁻¹</small> s<small>⁻¹</small> and an on–off ratio exceeding 10<small>⁵</small>. High-purity green light emission at 514 nm with a narrow full-width at half-maximum (FWHM) of 19.97 nm is achieved, showcasing the potential of PeLETs in various optoelectronic applications.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221573","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":"An attachable, self-healing and durable TiO2/rGO/PVA photocatalytic hydrogel band for dye degradation","authors":"Fancang Meng, Wenhao Wang, Yang Zeng, Zhiyuan Gao, Jiajing Li, Hongbing Jia, Qingmin Ji","doi":"10.1039/d4tc02634a","DOIUrl":"https://doi.org/10.1039/d4tc02634a","url":null,"abstract":"This work presents the fabrication of a photocatalytic hydrogel band through facile one-pot processes of mixing with TiO<small>₂</small> nanotubes (TiNT)/graphene oxide sheets (GO)/polyvinyl alcohol (PVA), <em>in situ</em> photoreduction of GO and freeze–thaw gelation. The interactions between TiNT/rGO/PVA make the constructed porous gel network possess good mechanical strength with flexibility and self-healing capability. The gelation matrix also allows the TiNT/rGO/PVA hydrogel band to easily adhere to various smooth surfaces. The structural and optical analysis of the TiNT/rGO/PVA hydrogel bands indicated that the binding of rGO on TiNT can boost the photocatalytic activity by accelerating charge separation and inhibiting charge recombination of TiO<small>₂</small>. Due to the combined effects of enhanced activity, porous features to facilitate molecular diffusion, and improved mechanical strength, the TiNT/rGO/PVA hydrogel bands exhibited excellent photocatalytic performance for the decomposition of dyes with well-maintained activity without a loss after repeated usages. These results showed the potential of hydrogel-based photocatalytic systems for more convenient and reliable usages in environmental remediation.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221592","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":"Ionic organic terahertz crystals: a perspective on design and solid-state phonon absorption","authors":"O-Pil Kwon and Mojca Jazbinsek","doi":"10.1039/D4TC01786B","DOIUrl":"https://doi.org/10.1039/D4TC01786B","url":null,"abstract":"<p >Ionic organic nonlinear optical crystals have been established as efficient terahertz (THz) wave generators with a high generated THz power and a very wide bandwidth and can also be used as ultra-broad THz detectors. In this perspective, we discuss various design strategies to obtain high-performance ionic organic THz crystals. The introduction of aromatic coulombic interaction groups and acentric head-to-tail cation–anion assembly groups, as well as the control of the van der Waals volume of aromatic ions, are common to many top-level ionic organic THz crystals. Solid-state molecular and phonon vibrations of these crystals strongly influence the characteristics of THz generation and detection, in addition to their optical and nonlinear optical properties. The THz vibrational modes depend on the chemical structure, intermolecular interaction ability, crystal structure, void volume, and crystal density of organic THz crystals. To give a perspective on the future design of optimized ionic organic THz crystals and the influence of their phonon modes on ultra-broadband THz applications, we discuss both the structural factors that influence these modes and their specific influence on THz optical properties.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/tc/d4tc01786b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174042","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":"Fabrication of a high performance memristor device by metallization of Ag+ inside a solution processed Li5AlO4 thin film","authors":"Subarna Pramanik, Rajarshi Chakraborty, Sobhan Hazra, Utkarsh Pandey, Bhola Nath Pal","doi":"10.1039/d4tc02527j","DOIUrl":"https://doi.org/10.1039/d4tc02527j","url":null,"abstract":"A solution processed Ag-ion-exchanged Li<small>₅</small>AlO<small>₄</small> thin film has been used to fabricate a high performance oxide memristor device with enhanced bistable switching and memory retention. For this device fabrication, an Li<small>₅</small>AlO<small>₄</small> thin film has been deposited on a highly p-doped silicon (p<small>⁺</small>-Si) substrate followed by an ion exchange and reduction process that allows the conversion of the Li<small>₅</small>AlO<small>₄</small> thin film to an Ag(Ag<small>⁺</small>)–Al<small>₂</small>O<small>₃</small> film. The Ag(Ag<small>⁺</small>)–Al<small>₂</small>O<small>₃</small> film is a mixed phase consisting of an Ag nanoparticle embedded Al<small>₂</small>O<small>₃</small> film and silver ions and is responsible for resistive switching whereas the p<small>⁺</small>-Si substrate works as the bottom electrode. A silver electrode has been used on top of Ag(Ag<small>⁺</small>)–Al<small>₂</small>O<small>₃</small>/p<small>⁺</small>-Si that works as the top electrode of this memristor device. The <em>I</em>–<em>V</em> characteristics of the device demonstrate a reversible switching behaviour that remains stable even after 200 consecutive operation cycles. Furthermore, the ratio between the forward and reverse sweeps of the device exceeds 10<small>³</small> orders of magnitude and the device has a stable data retention capability of ∼4 × 10<small>⁴</small> seconds (∼12 hours) maintaining its on/off ratio of ∼10<small>⁴</small>. Also, this device effectively emulates the properties of ReRAM up to 200 iterations.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221569","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":"Formation mechanism of micro-sized Cu plates using Br ions as basal plane-specific adsorbent and their application in the preparation of highly conductive and flexible Cu films","authors":"Yusaku Noda, Shun Yokoyama, Takashi Itoh, Balachandran Jeyadevan","doi":"10.1039/d4tc02694b","DOIUrl":"https://doi.org/10.1039/d4tc02694b","url":null,"abstract":"A facile technique based on the aqueous chemical reduction of Cu–lactic acid complexes with ascorbic acid, in the presence of Br<small>⁻</small> ions as capping agents, was developed to synthesize micrometer-sized Cu plates (Cu MPLs). Crystal and surface analyses suggested that Br<small>⁻</small> ions were adsorbed on the basal planes of the 14-hedral particle seeds, and Cu was subsequently deposited on the side planes of the seeds, affording Cu MPLs. Electrochemical analysis and pH–potential diagrams of the reaction solutions revealed that the reduction pathway from Cu complexes to Cu without oxide formation was essential for facilitating the anisotropic growth of Cu crystals to obtain Cu MPLs. In addition, Cu thin films prepared by sintering a mixture of Cu MPLs and Cu nanoparticles (NPs) exhibited a lower resistivity (66 μΩ cm) at 200 °C than Cu NPs (129 μΩ cm) and a mixture of Cu NPs and three-dimensional (3D) and micrometer-sized Cu particles (3D MPs) (95 μΩ cm). This is because the Cu NPs act as a filler to bind the Cu MPLs or 3D MPs in the bimodal system. The number of voids in the NP and MPL mixture was lower than that in the mixture of NPs and 3D MPs because of the broad basal planes of the MPLs. Besides, the Cu film consisting of NPs and MPLs exhibited enhanced flexibility compared to the other films. We demonstrate that Cu MPLs are more suitable than 3D MPs for bimodal systems to achieve low resistivity and high flexibility at low sintering temperatures.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221568","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":"Linker engineering of benzothiadiazole and its derivative-based covalent organic frameworks for efficient photocatalytic oxidative amine coupling and hydrogen peroxide generation","authors":"Chao-Qin Han, Jia-Xin Guo, Lei Wang, Shuai Sun, Jie Lv, Xiaokang Sun, Hanlin Hu, Xiaoxi Huang, Xiao-Yuan Liu","doi":"10.1039/d4tc02406k","DOIUrl":"https://doi.org/10.1039/d4tc02406k","url":null,"abstract":"Covalent organic frameworks (COFs) have recently gained recognition as highly effective photocatalysts for solar energy conversion, in which manipulation of the electronic structures of photocatalysts is crucial for optimizing their photocatalytic performances. In this study, four benzothiadiazole and its derivative-based COFs (HIAM-0007 to HIAM-0010) were rationally designed and synthesized, which show remarkable differences toward photocatalytic oxidative amine coupling and hydrogen peroxide generation. The benzothiadiazole-based COF exhibits efficient oxidative amine coupling with a yield of up to 99%, while the naphthothiadiazole-based COF shows the highest rate of 796 μmol g<small>⁻¹</small> h<small>⁻¹</small> for photocatalytic hydrogen peroxide generation from air and water without additional reagents. This work underscores the variability in the activity of individual COFs across different photocatalytic reaction systems, demonstrating that the best performance is a combination of the electronic structures of COFs and the surrounding reaction environment.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221571","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}