Journal of Materials Chemistry C最新文献

{"title":"(NH4)2MnF6: a highly soluble, K+-free Mn4+ precursor for red fluoride phosphors","authors":"Mengyao Wang, Wenrui Zhang, Liying Zhang and Haipeng Ji","doi":"10.1039/D5TC02647D","DOIUrl":"https://doi.org/10.1039/D5TC02647D","url":null,"abstract":"<p >To address the limitations of low solubility and K<small>⁺</small> impurity introduction in traditional Mn<small>⁴⁺</small> sources (<em>e.g.</em>, K<small>₂</small>MnF<small>₆</small>) for synthesizing Mn<small>⁴⁺</small>-activated fluoride phosphors, we synthesize a new K<small>⁺</small>-free compound, (NH<small>₄</small>)<small>₂</small>MnF<small>₆</small>, which exhibits approximately two times higher solubility than K<small>₂</small>MnF<small>₆</small>. (NH<small>₄</small>)<small>₂</small>MnF<small>₆</small> was successfully synthesized <em>via</em> an optimized reduction-precipitation-purification process using a KMnO<small>₄</small>/NH<small>₄</small>HF<small>₂</small>/HF system with controlled gradient H<small>₂</small>O<small>₂</small> addition. Utilizing this Mn<small>⁴⁺</small> source, red-emitting (NH<small>₄</small>)<small>₂</small>SiF<small>₆</small>:Mn<small>⁴⁺</small> crystals with high absorption efficiency were synthesized by cooling-induced crystallization. The doping efficiency of Mn<small>⁴⁺</small> in (NH<small>₄</small>)<small>₂</small>SiF<small>₆</small> using (NH<small>₄</small>)<small>₂</small>MnF<small>₆</small> as the Mn<small>⁴⁺</small> precursor significantly surpasses that achievable with K<small>₂</small>MnF<small>₆</small>. Furthermore, distinct doping behavior was observed: (NH<small>₄</small>)<small>₂</small>MnF<small>₆</small> facilitated a phase transition from cubic to hexagonal (NH<small>₄</small>)<small>₂</small>SiF<small>₆</small>:Mn<small>⁴⁺</small> with increasing Mn<small>⁴⁺</small> concentration, while K<small>₂</small>MnF<small>₆</small> led to K<small>₂</small>SiF<small>₆</small>:Mn<small>⁴⁺</small> formation. The hexagonal phase induced reduced site symmetry around Mn<small>⁴⁺</small>, resulting in intense and tunable zero-phonon line emission. Under 455 nm blue excitation, the crystals exhibited narrow-band red emission peaking at 633 nm. The successful synthesis of highly soluble (NH<small>₄</small>)<small>₂</small>MnF<small>₆</small> paves the way for developing K<small>⁺</small>-free red phosphors with high doping levels, tunable luminescence properties, and reduced HF consumption in scalable crystal growth.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 35","pages":" 18071-18078"},"PeriodicalIF":5.1,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145036956","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":"Stress-coupled spin state switching in a spin crossover composite modulates current in an organic semiconductor.","authors":"Yuteng Zhang, Aurelian Rotaru, Thomas Ranquet, Xinyu Yang, Yue Zan, Benjamin Reig, Isabelle Séguy, Lionel Salmon, Gábor Molnár, Azzedine Bousseksou","doi":"10.1039/d5tc02153g","DOIUrl":"https://doi.org/10.1039/d5tc02153g","url":null,"abstract":"<p><p>The combination of spin-crossover (SCO) complexes with electrically conducting materials offers a promising route for developing stimuli-responsive electronics, yet the mechanism of charge transport modulation remains unexplored. Here, we investigate a bilayer heterostructure comprising silica-coated SCO nanoparticles [Fe(Htrz)₂(trz)](BF₄)@SiO₂ within a polyvinylpyrrolidone (PVP) matrix and organic semiconductors (OSCs), where mechanical stress generated by spin-state switching within the PVP:SCO layer modulates the conductance within the OSC layer. Through <i>in situ</i> piezo-resistivity characterization, we reveal a reversible conductance modulation in the OSC layer under hydrostatic pressure, providing a quantitative evaluation of pressure-induced stress sensitivity with the OSC layer. Crucially, the intrinsic properties of the SCO nanoparticles dictate key characteristics of the switching device such as the spin transition temperature and hysteresis width, enabling tunable and non-volatile memory behavior. Demonstrating robust switching over multiple thermal cycles-rooted in the intrinsic thermal stability of the SCO and validated by X-ray diffraction/optical spectroscopy analysis at elevated temperatures-this work lays the groundwork for a new class of stress-coupled spin-electronic systems, offering a potential route for the development of piezo-resistive sensors and adaptive memory devices.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" ","pages":""},"PeriodicalIF":5.1,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12368574/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144936483","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":"Cage-based hydrogen-bonded organic frameworks: a systematic review","authors":"Jingyan Tang, Xingzhe Hu, Xuewu Zhu, Bingyu Xu and Ming Li","doi":"10.1039/D5TC02124C","DOIUrl":"https://doi.org/10.1039/D5TC02124C","url":null,"abstract":"<p >Hydrogen-bonded organic framework (HOF) materials represent a novel category of porous materials that have attracted considerable attention owing to their mild synthesis conditions, self-healing capabilities, and recyclability. Molecular cages serve as critical components in supramolecular and host–guest chemistry. Because of their distinctive structural characteristics, HOFs offer unique advantages in heterogeneous catalysis, molecular recognition, and proton transfer processes. The integration of functionalized molecular cages with HOFs results in the formation of cage-based HOFs (Cage-HOFs). These materials possess various crystal-stacking patterns and abundant hydrogen bonds, offering promising opportunities for the development of advanced functional materials. This synergistic combination not only introduces innovative approaches for material design and functionalization but also expands the frontiers of materials science research. This review provides a comprehensive overview of the historical progress of Cage-HOFs, elucidates their structural classification and synthetic strategies, and meticulously evaluates recent developments in their applications in energy, environmental science, and catalysis. Moreover, it provides a critical assessment of the potential opportunities and challenges associated with the future advancement of Cage-HOFs, aiming to establish theoretical foundations and strategic directions for their eventual industrial applications.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 35","pages":" 18031-18042"},"PeriodicalIF":5.1,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145036953","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":"Electrical and magnetic properties of atomic layer deposited cobalt oxide and iron oxide stacks","authors":"Kristjan Kalam, Raul Rammula, Jekaterina Kozlova, Tanel Käämbre, Peeter Ritslaid, Aarne Kasikov, Aile Tamm, Joosep Link, Raivo Stern, Guillermo Vinuesa, Salvador Dueñas, Helena Castán and Kaupo Kukli","doi":"10.1039/D5TC01923K","DOIUrl":"https://doi.org/10.1039/D5TC01923K","url":null,"abstract":"<p >Cobalt and iron oxides, due to their tunable structural and magnetic properties, are widely studied for electronic and spintronic applications. However, achieving high coercivity and saturation magnetization in ultrathin films remains a challenge. In this work, we report on the atomic layer deposition (ALD) of nanolaminates and mixed cobalt–iron oxide films on silicon and TiN substrates at 300–450 °C. Using supercycle and multistep ALD methods with ferrocene and cobalt acetylacetonate precursors, we synthesized Co<small>₃</small>O<small>₄</small>–Fe<small>₂</small>O<small>₃</small> bilayers and ternary ferrites (Co<small>₂</small>FeO<small>₄</small> and CoFe<small>₂</small>O<small>₄</small>). The structural, morphological, electrical, and magnetic properties were characterized. We observed that thin films (∼7–12 nm) exhibit markedly enhanced breakdown fields and exceptional magnetic coercivity (up to 25 kOe) and saturation magnetization (up to 1000 emu cm<small>⁻³</small>), especially after annealing. These results demonstrate a viable route to engineer ferrite-based thin films with superior magnetic and dielectric performance at nanoscale thicknesses.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 34","pages":" 17551-17565"},"PeriodicalIF":5.1,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/tc/d5tc01923k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914506","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":"Flexible piezoelectric pressure sensors utilizing a low-dimensional perovskite–PVDF composite","authors":"Moria Lighthouse, Tehila Wallach, Eliyahu Goldstein, Tal Medichi, Doron Azulay, Ouriel Bliah, Shlomo Magdassi, Oded Millo and Lioz Etgar","doi":"10.1039/D5TC02231B","DOIUrl":"https://doi.org/10.1039/D5TC02231B","url":null,"abstract":"<p >Technological advancements drive the demand for smart, flexible, and sustainable devices capable of integration into daily life. Pressure sensors, particularly those utilizing halide perovskites, face key challenges in sensitivity, stability, and integration with soft systems. This study focuses on the investigation of quasi-two-dimensional (2D) perovskite pressure sensors, where the perovskite is embedded within a polyvinylidene fluoride (PVDF) polymer matrix and protected by a polydimethylsiloxane (PDMS) polymer layer. The improvement in the performance of the pressure sensors is achieved through the optimization of the solvent composition, perovskite : PVDF ratio, and thickness of the PDMS layer, with a deep understanding of the morphological structure's influence on piezoelectric properties. Our perovskite layer achieves a high piezoelectric coefficient (<em>d</em><small>₃₃</small>) of 31.26 pm V<small>⁻¹</small>, surpassing previously reported values for halide perovskites. Unlike previous studies, we systematically investigate the correlation between the PDMS thickness and the piezoelectric response, identifying a critical thickness threshold (∼23 μm) beyond which sensing is suppressed. The devices demonstrate pressure sensitivity in the absence of any external power source and maintain reliable performance for 1000 cycles and up to 60 days under ambient conditions. Successful integration of the sensors into soft robotic grippers while also demonstrating sensitivity to various weights highlights their potential for application in fields such as soft robotics and healthcare.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 35","pages":" 18060-18070"},"PeriodicalIF":5.1,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145036955","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":"Controllable preparation of Cs+ incorporated polyacrylonitrile (PAN) gel for rapid and highly sensitive visual detection of Pb2+","authors":"Ying Zhou, Jinyang Luo, Mingyuan Sun, Chunyu Zhao, Chengyu Shi and Aizhao Pan","doi":"10.1039/D5TC02719E","DOIUrl":"https://doi.org/10.1039/D5TC02719E","url":null,"abstract":"<p >The pollution of lead poses significant environmental and health risks. A luminescent perovskite-based gel sensor was developed for rapid and highly sensitive visual Pb<small>²⁺</small> detection, which facilitates the conversion of Pb<small>²⁺</small> into luminescent CsPbBr<small>₃</small> nanocrystals. This approach offers significant potential for real-time environmental monitoring and heavy metal analysis.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 34","pages":" 17566-17570"},"PeriodicalIF":5.1,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914507","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":"Correction: Circularly polarized luminescence with large dissymmetry factors based on perovskite and cholesteric liquid crystal polymer network films","authors":"Liting Xu, Huajun Lei, Zongqi Li, Wei Liu, Yi Li and Yonggang Yang","doi":"10.1039/D5TC90138C","DOIUrl":"https://doi.org/10.1039/D5TC90138C","url":null,"abstract":"<p >Correction for ‘Circularly polarized luminescence with large dissymmetry factors based on perovskite and cholesteric liquid crystal polymer network films’ by Liting Xu <em>et al.</em>, <em>J. Mater. Chem. C</em>, 2025, <strong>13</strong>, 7544–7549, https://doi.org/10.1039/D4TC05268D.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 33","pages":" 17377-17377"},"PeriodicalIF":5.1,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/tc/d5tc90138c?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144887902","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":"Growing ferromagnetic Fe–Ni alloy nanoparticles on nanodiamond nanotemplates: the role of sp2-type carbon in their development and in the appearance of a martensitic-type phase†","authors":"Panagiotis G. Ziogas, Athanasios B. Bourlinos, Polyxeni Chatzopoulou, George P. Dimitrakopulos, Anastasios Markou and Alexios P. Douvalis","doi":"10.1039/D5TC01095K","DOIUrl":"https://doi.org/10.1039/D5TC01095K","url":null,"abstract":"<p >This work presents a novel hybrid nanostructured magnetic material consisting of ferromagnetic (FM) fcc Fe–Ni nanoparticles (NPs) grown on nanodiamond (ND) nanotemplates. The development of this hybrid magnetic nanomaterial is realized through the combination of wet chemistry and thermal annealing under vacuum. The characterization and study of the prepared samples, which were performed using a range of specialized experimental techniques, reveal that thermal annealing of the as-made hybrid precursor under a range of different conditions leads to the growth of fcc Fe–Ni alloy NPs at the surfaces of the ND nanotemplates. These alloy NPs have an average size of 10 nm, exhibit uniform distribution on the ND nanotemplates and have a predominant nickel content of approximately 64 at%. They demonstrate FM behavior throughout a temperature range from 2 K to 400 K, with maximum magnetization values ranging between 8.6 and 11.9 emu g<small>⁻¹</small> and coercivities ranging between 10 and 610 Oe. Moreover, <small>⁵⁷</small>Fe Mössbauer spectroscopy reveals that apart from the predominant fcc FM Fe–Ni phase, iron atoms also participate in the formation of a secondary martensitic-type Fe–Ni phase, the development of which is attributed to the partial diffusion of carbon atoms at interstitial sites within the Fe–Ni lattices during the alloy NP formation at elevated temperatures, as a consequence of the unique morphological properties of the ND growth matrices, which facilitate surface formation and reconstruction of sp<small>²</small> nanostructures. Concurrently to their diffusion within the Fe–Ni NP lattice, the carbon atoms are also found to reconstruct layered graphitic-type nanostructures enveloping the metallic alloy NPs, but only where ND NPs are adjacent. These non-typical nanohybrid materials hold significant potential for use in applications related, but not limited to biomedicine, biopharmaceutics, catalysis, and other various contemporary technological fields.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 35","pages":" 18145-18166"},"PeriodicalIF":5.1,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/tc/d5tc01095k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037031","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":"Incorporation and electronic sensing device effects of aniline functionality in diketopyrrolopyrrole–thiophene semiconducting polymers†","authors":"Sasikumar Mayarambakam, Christopher Riley Bond, Howard E. Katz, Jimetochukwu Solomon and Hany F. Sobhi","doi":"10.1039/D5TC01597A","DOIUrl":"https://doi.org/10.1039/D5TC01597A","url":null,"abstract":"<p >The detection and monitoring of volatile organic compounds (VOCs) are crucial in environmental and medical monitoring. Organic field-effect transistor (OFET)-based sensors offer several advantages over conventional spectroscopic methods, including real-time, low-power, and wearable integration capabilities. In particular, diketopyrrolopyrrole (DPP)-based polymers exhibit exceptional semiconducting properties, making them promising candidates for active layers in OFET sensors. Their chemical tunability enables the incorporation of selective and sensitive biomarker moieties, either on the polymer backbone or side chains, to enhance analyte specificity. In this study, we synthesized a series of seven DPP-based copolymers functionalized with aniline derivatives named <strong>P1</strong>, <strong>P2</strong>, <strong>P3</strong>, <strong>P1BT1:1</strong>, <strong>P1BT1:2</strong>, <strong>P3BT1:1</strong> and <strong>P3BT1:2</strong> as biomarkers for acetone sensing. The aniline functionalities were systematically modified with electron-donating (methoxy) and electron-withdrawing (chloro) substituents to evaluate their impact on sensor performance. Device optimization was achieved by investigating different dielectric materials, including SiO<small>₂</small> and cross-linked polystyrene on SiO<small>₂</small>, the latter effectively reducing observed gate leakage. Further optimization of the semiconducting layer was performed by comparing devices incorporating pristine aniline-functionalized DPP polymers with those utilizing a blend of pristine polymers and PDPP4T to enhance charge transport. The sensing performance of the optimized OFET devices was evaluated for acetone, dimethyl carbonate, and acetic acid, in vapor and solution phases. The findings from this study provide insights into the structure–property relationships of DPP-based semiconductors for VOC detection and highlight their potential for integration into portable electronic sensors.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 35","pages":" 18176-18186"},"PeriodicalIF":5.1,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/tc/d5tc01597a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037033","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":"Bis(phenylethynyl)benzenes enable stable visible-to-ultraviolet sensitized triplet-triplet annihilation upconversion.","authors":"Davide Lardani, Alessandra Ronchi, Xueqian Hu, Angelo Monguzzi, Christoph Weder","doi":"10.1039/d5tc02434j","DOIUrl":"https://doi.org/10.1039/d5tc02434j","url":null,"abstract":"<p><p>Ultraviolet (UV) light plays a central role in applications ranging from photochemistry to sterilization and water treatment. However, its low abundance in sunlight (∼10%) limits the direct solar use of UV-driven processes. Sensitized triplet-triplet annihilation upconversion (TTA-UC) offers a promising route to generate UV light from visible light under low-power excitation. Yet, molecular systems capable of efficient visible-to-UV TTA-UC remain scarce. Here, we demonstrate that 1,4-bis(phenylethynyl)benzene (BPEB) and its alkoxylated derivative serve as efficient UV-emitting annihilators when paired with the visible-light sensitizer Ir(ppy)₃ in toluene solution. These systems achieve upconverted emission centered at 380 nm, with anti-Stokes shifts exceeding 0.6 eV with respect to excitation energy and threshold excitation intensities as low as 11.5 mW cm^-2. Spectroscopic studies suggest that modulation of high-energy excited-state dynamics plays a key role in optimizing upconversion performance. By broadening the molecular design space of UV-emitting annihilators beyond traditional polycyclic aromatics, this study provides a foundation for future development of low-intensity visible-to-UV TTA-UC systems. These findings expand the molecular toolkit for photonic applications where UV emission from ambient light is required.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" ","pages":""},"PeriodicalIF":5.1,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12362340/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144936501","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}