Journal of Materials Chemistry C最新文献

{"title":"Enhanced thermoelectric and mechanical properties of Cu1.8S1−xPx bulks mediated by mixed phase engineering†","authors":"Xi Yan, Qin-Yuan Huang, Tian-Yu Yang, Ding-Yi Yu, Hao Yin, Chong-Yu Wang, Zhen-Hua Ge, Yi-Xin Zhang and Hong-Jiang Pan","doi":"10.1039/D5TC00170F","DOIUrl":"https://doi.org/10.1039/D5TC00170F","url":null,"abstract":"<p >Copper sulfide is considered an advanced thermoelectric material due to its non-toxic nature and cost-effectiveness. Nevertheless, as a superionic conductor, Cu<small>_1.8</small>S demonstrates exceptionally high conductivity, and its thermoelectric properties can be improved by adjusting the carrier concentration. In this study, samples of Cu<small>_1.8</small>S<small>_{1−<em>x</em>}</small>P<small>_<em>x</em></small> (<em>x</em> = 0–0.04, with an interval of 0.01) were designed using a combination of melting and spark plasma sintering techniques. The phase composition of the matrix changed from Cu<small>_1.8</small>S to Cu<small>_1.96</small>S and Cu<small>₂</small>S through the artificial reduction of S content, resulting in increased grain size and lower concentrations of multidimensional defects. Compared to the pure sample, the carrier mobility of the Cu<small>_1.8</small>S<small>_0.97</small>P<small>_0.03</small> sample ultimately increased from 32 to 71 cm<small>²</small> V<small>⁻¹</small> s<small>⁻¹</small>, attaining a maximum <em>ZT</em> value of 1.25 at 873 K. Furthermore, the reduced defect concentration and local stress concentration enhanced the mechanical properties (microhardness and Young's modulus) of the Cu<small>_1.8</small>S<small>_0.97</small>P<small>_0.03</small>. Thus, this study provides novel insights into the optimization of the thermoelectric properties of the Cu–S system and underscores its significant potential for application in other sulfide thermoelectric materials.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 12","pages":" 6085-6094"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667791","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":"Fabrication of loss-less La3Si6N11:Ce3+ phosphor-in-glass color converters using oxygen-free ZIF-62 glass†","authors":"Taoli Deng, Zan Ding, Shuang Zheng and Rong-Jun Xie","doi":"10.1039/D4TC05380J","DOIUrl":"https://doi.org/10.1039/D4TC05380J","url":null,"abstract":"<p >Ce<small>³⁺</small>-doped nitride phosphors are promising color converters in laser-driven lighting and display technologies, but they suffer from serious loss in luminescence efficiency caused by the interfacial reaction between phosphor powders and glass powders during the fabrication of phosphor-in-glass bulks or films. In this work, the oxygen-free organic–inorganic hybrid glass (OIHG) Zn(Im)<small>₃</small>(HbIm) (ZIF-62) was used instead of the traditional oxide glass to prepare an La<small>₃</small>Si<small>₆</small>N<small>₁₁</small>:Ce<small>³⁺</small> (LSN) phosphor converter by cofiring LSN with the ZIF-62 glass. The LSN phosphor-in-ZIF-62 glass converter well maintains the internal quantum efficiency of the original phosphor powders, showing a luminescence loss of only ∼1%. The sandwich-structured LSN-in-ZIF-62 glass converter, constructed by cofiring it with sapphire substrates, enables the generation of white lighting with a maximum luminous flux of 872.2 lm and a luminous efficacy of 291 lm W<small>⁻¹</small> when pumped by a blue laser diode at a powder density of 5.99 W mm<small>⁻²</small>. The use of the oxygen-free ZIF-62 glass provides a viable method to design nitride phosphor-based color converters for low-power laser-driven lighting, high-power LED lighting or projection applications.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6779-6787"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/tc/d4tc05380j?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716562","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":"Two-dimensional nanomaterials as lubricant additives: the state-of-the-art and future prospects","authors":"Zhengquan Jiang, Jiahao Wu, Laigui Yu, Jinglei Bi, Yadong Wang, Xiaoyi Hu, Yujuan Zhang and Weihua Li","doi":"10.1039/D4TC04844J","DOIUrl":"https://doi.org/10.1039/D4TC04844J","url":null,"abstract":"<p >Two-dimensional (2D) nanomaterials, such as graphene, transition metal dichalcogenides (TMDs), Ti<small>₃</small>C<small>₂</small>T<small>_<em>x</em></small> MXene and g-C<small>₃</small>N<small>₄</small>, have shown outstanding potential as lubricant additives, due to their nanoscale thickness, ultra-low interlayer shear strength, large surface area, and good stability. This review summarizes the recent progresses in the applications of 2D nanomaterials as water- and oil-based lubricant additives and their lubrication mechanisms such as tribofilm formation, interlayer sliding, rolling effect, surface repairing effect, and polishing effect. Additionally, it discusses the challenges faced in their practical application, such as compatibility and stability issues, and suggests future research directions to foster innovation in 2D material-based nano-lubricants, aiming to advance their practical implementation in various lubrication scenarios.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 9","pages":" 4327-4373"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513038","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":"AIEE active dual-state emissive tripodal pyridopyrazine derivatives as multi-stimuli responsive smart organic materials†","authors":"Monika Lamoria, Debashree Manna and Marilyn Daisy Milton","doi":"10.1039/D4TC04692G","DOIUrl":"https://doi.org/10.1039/D4TC04692G","url":null,"abstract":"<p >This work presents the synthesis of five novel pyridopyrazine derivatives (PPDs) <strong>PP1–PP5</strong>. These PPDs have high quantum yields (<em>Φ</em>) up to 0.87 in solid and solution states. This dual-state emissive behavior was supported by AIEE properties. Single crystal X-ray diffraction (SCXRD) studies confirmed the absence of π–π stacking interactions in the unit cell. The SCXRD analysis of <strong>PP4</strong> also revealed a twisted conformation and herringbone packing arrangement. All pyridopyrazine derivatives detected TFA reversibly in solution and the powdered state. Probe <strong>PP2</strong> was also incorporated in the guar-gum borax hydrogel matrix and could detect TFA in the gel phase with a color change from blue to yellow. These PPDs were also exploited for their metal sensing abilities and could selectively sense Hg<small>²⁺</small> ions with detection limits in ppm. Theoretical studies were also raised to support experimental findings. The changes in emissive properties with increasing temperature from 30 °C to 80 °C were also studied for these PPDs.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6907-6921"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716599","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":"Very high frequency (∼100 MHz) plasma enhanced atomic layer deposition high-κ hafnium zirconium oxide capacitors near morphotropic phase boundary with low current density & high-κ for DRAM technology†","authors":"Ketong Yang, Hunbeom Shin, Seungyeob Kim, Taeseung Jung and Sanghun Jeon","doi":"10.1039/D4TC04979A","DOIUrl":"https://doi.org/10.1039/D4TC04979A","url":null,"abstract":"<p >Hafnium dioxide-based ferroelectric (FE) films are emerging as pivotal materials for advanced memory storage and neuromorphic computing, particularly in ultra-scaled dynamic random-access memory (DRAM) technologies. To meet the stringent DRAM performance requirements—dielectric constants (<em>κ</em>) exceeding 60 and leakage current densities below 10<small>⁻⁶</small> A cm<small>⁻²</small> at 0.8 V—hafnium zirconium oxide (HZO) films engineered near the morphotropic phase boundary (MPB) are leading candidates. These films offer a favorable balance of high dielectric properties and reduced equivalent oxide thickness while managing leakage. However, film thinning often escalates leakage currents, presenting a significant design challenge. Moreover, interfacial damage induced by conventional deposition techniques can undermine dielectric stability. Here, we present a novel approach utilizing very high frequency (VHF, 100 MHz) plasma-enhanced atomic layer deposition (PE-ALD) to fabricate 4.5 nm HZO films with superior crystalline quality and minimized oxygen vacancies. This method yields an impressive dielectric constant of 64.47, markedly surpassing radio frequency-deposited counterparts. Notably, at elevated temperatures up to 389 K, the dielectric constant reaches 69.9, approaching the theoretical tetragonal-phase limit. Our results demonstrate the transformative potential of VHF PE-ALD in optimizing HZO film properties, establishing a compelling pathway for future high-performance DRAM applications.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6702-6707"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/tc/d4tc04979a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716640","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":"Advanced numerical modeling of multi-absorber Cs2AgBiBr6/CsSnCl3 solar cells: unveiling charge dynamics, trap phenomena, and noise characterization of high-efficiency photovoltaics","authors":"Devansh Gahlawat, Jaspinder Kaur, Rikmantra Basu, Ajay Kumar Sharma, Sidhanth Garg, Manisha Bharti, Jaya Madan and Rahul Pandey","doi":"10.1039/D4TC05003G","DOIUrl":"https://doi.org/10.1039/D4TC05003G","url":null,"abstract":"<p >This study presents an extensive numerical modeling of a high-efficiency photovoltaic device featuring a multi-absorber architecture, comprising Cs<small>₂</small>AgBiBr<small>₆</small> and CsSnCl<small>₃</small>, by exploiting their complementary bandgaps for broader solar spectrum absorption. By optimizing parameters such as absorber thickness, shallow acceptor/donor densities, and trap dynamics—including electron and hole capture cross-sections and energy level distributions—device performance was enhanced. The optimization extended to metal electrode work functions to ensure appropriate band alignment and ohmic contacts. The study further explores the effects of series and parasitic resistances, thermal conditions, and dynamic charge transport transitions, introducing an RC circuit model to include both resistive and capacitive aspects. Electrical profiling and Mott–Schottky analysis revealed shifts in the depletion region and flat band potential conditions, while Johnson–Nyquist noise characterization examined the interplay between noise manifestations and charge carrier dynamics across various device configurations. The final optimized device demonstrated superior performance with <em>V</em><small>_OC</small> = 1.18 V, <em>J</em><small>_SC</small> = 20.78 mA cm<small>⁻²</small>, FF = 87.14%, and <em>η</em> = 21.75%. This work provides a sophisticated framework for developing efficient, stable photovoltaic devices while offering deeper insights into optoelectronic and semiconductor behavior.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 12","pages":" 6171-6194"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667811","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 critical role of phase transition and composition regulation in inorganic perovskite electrocaloric materials","authors":"Yuxuan Hou, Junjie Li, Ruowei Yin, Xiaopo Su, Yanjing Su, Lijie Qiao, Zhiguo Zhang, Chuanbao Liu and Yang Bai","doi":"10.1039/D4TC05060F","DOIUrl":"https://doi.org/10.1039/D4TC05060F","url":null,"abstract":"<p >The electrocaloric effect (ECE) has arisen as a promising solid-state cooling technique. Inorganic perovskites as an innovative EC material have been widely investigated, due to their high energy efficiency, zero emissions, low cost, and ease of manipulation. However, it remains a challenge to achieve a giant ECE across a broad temperature range. Currently, the solution mainly focuses on the configurational entropy change from phase transition. To clarify the relationship between phase transitions and ECEs, this review discusses the EC features among different types of phase transitions, as well as the role of compositional regulation. Reasonable compositional regulation can combine the high configurational entropy in first-order phase transitions with the advantage of a wide phase transition temperature range in diffuse phase transitions, thereby addressing this challenge. The use of machine learning to discover new materials and improve material quality will be a key direction for future research.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 11","pages":" 5406-5423"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612038","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":"Tetrabromobenzene-based molecular alloys – a tool for tailoring the temperature of the thermosalient phase transition†","authors":"Teodoro Klaser, Oskar Stepančić, Jasminka Popović, Jana Pisk, Luka Pavić, Igor Picek, Dubravka Matković-Čalogović and Željko Skoko","doi":"10.1039/D4TC04615C","DOIUrl":"https://doi.org/10.1039/D4TC04615C","url":null,"abstract":"<p >A series of molecular alloys of 1,2,4,5-tetrabromobenzene and 1,2,4,5-tetrachlorobenzene with varying compositions were prepared in an attempt to obtain jumping crystals with adjustable temperature of thermosalient phase transition. Molecular alloys were studied with a combination of thermal and structural techniques (DSC, SCXRD, XRPD, hot-stage microscopy). Alloys with a high 1,2,4,5-tetrabromobenzene content (more than 90 wt%) exhibited thermosalient behaviour. Thermosalient alloys exhibited negative uniaxial thermal expansion and colossally large coefficients of thermal expansion (both linear and volumetric), with unit cell parameters increasing proportionally with tetrabromobenzene content. Finally, it was found that the temperature of phase transition increases linearly with the tetrabromobenzene content, from 30.13 °C to 45.33 °C, meaning that the tuning temperature of thermosalient mechanic response was successfully achieved.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6539-6546"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/tc/d4tc04615c?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716572","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":"Electronic structures and magnetic properties of the rare-earth-free permanent magnet α′′-Fe16N2: first-principles calculations†","authors":"Peirun Duan, Qingming Ping, Douqiang Sun, Qihang Luo, Haojie Li, Haoyu Xu, Xian Liu, Xiaohui Shi and Lulu Du","doi":"10.1039/D4TC04934A","DOIUrl":"https://doi.org/10.1039/D4TC04934A","url":null,"abstract":"<p >There are challenges in the production and application of rare-earth permanent magnet (PM) materials due to resource distribution, cost, environmental unfriendliness, and recycling difficulties. Thereby, the demand for high-performance rare-earth-free PMs has increased rapidly over the past decade. Body-centered tetragonal α′′-Fe<small>₁₆</small>N<small>₂</small> is a promising candidate for future rare-earth-free PMs due to the low cost of Fe, environmental friendliness and high energy. In this work, the electronic structures and magnetic properties of body-centered tetragonal α′′-Fe<small>₁₆</small>N<small>₂</small> are investigated by first-principles calculations. The total magnetic moments of α′′-Fe<small>₁₆</small>N<small>₂</small> are 38.59<em>μ</em><small>_B</small> per cell, equivalent to 2.41<em>μ</em><small>_B</small>/Fe atoms. Through band and density of state analysis, α′′-Fe<small>₁₆</small>N<small>₂</small> is found to present metallic and ferromagnetic character. The magnetocrystalline anisotropy energy (<em>E</em><small>_MCA</small>) of α′′-Fe<small>₁₆</small>N<small>₂</small> is −0.66 J cm<small>⁻³</small>, showing perpendicular magnetic anisotropy (PMA). PMA can be mainly ascribed to the spin–orbit-coupling between (d<small>_{<em>z</em><small>²</small>}</small>, d<small>_<em>yz</em></small>) and (d<small>_<em>xz</em></small>, d<small>_<em>yz</em></small>) orbitals at the Fe(8h) site. The Curie temperature of α′′-Fe<small>₁₆</small>N<small>₂</small> is 1369 K, which is larger than that of pure bcc-Fe (1023 K). Therefore, α′′-Fe<small>₁₆</small>N<small>₂</small> possessing PMA and high Curie temperature is a potential rare-earth-free PM candidate material, which has application prospects in high temperature data storage devices, traction motors, wind turbines and power generating machines.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 13","pages":" 6728-6735"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716557","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":"Molecular trap engineering enables superior high-temperature charge–discharge efficiency in a polymer blend with densely packed molecular chains†","authors":"Qiyan Zhang, Juntian Zhuo, Wugang Liao, Shuangwu Huang and Shuxiang Dong","doi":"10.1039/D5TC00485C","DOIUrl":"https://doi.org/10.1039/D5TC00485C","url":null,"abstract":"<p >Polymer dielectrics are ideal for capacitors in power electronics, power conditioning, and pulsed power systems due to their high breakdown strength, ease of processing, and reliability. However, they currently fall short of the high-temperature requirements for emerging applications such as hybrid and electric vehicles and photovoltaic power generation. Here, we present a general approach to impeding charge transport in all-organic polymer composites by introducing organic molecular semiconductors with high electron affinity into a polymer blend with densely packed molecular chains. This strategy significantly reduces conduction loss and enhances breakdown strength under elevated temperatures and high electric fields. At 150 °C, the resulting polymer blend-based all-organic composites achieve high discharged energy densities of 3.45 J cm<small>⁻³</small> and 3.68 J cm<small>⁻³</small> for TPI/PEI/PC61BM and TPI/PEI/NTCDA composites, respectively, with a 90% charge–discharge efficiency. This performance is approximately three times higher than that of the pristine TPI/PEI blend (1.19 J cm<small>⁻³</small>). NTCDA, in particular, demonstrates similar effectiveness in enhancing high-temperature capacitor performance while being significantly more cost-effective compared to PC61BM and other previously reported organic molecular semiconductors. Consequently, this polymer blend-based all-organic composite offers a promising solution for the scalable fabrication of high-performance, high-quality polymer films required for high-temperature capacitive energy storage.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 11","pages":" 5496-5502"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611934","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}