Journal of Materials Chemistry C最新文献

{"title":"Suppression of pyrene excimers through sulfur-bridge oxidation and steric shielding","authors":"Vignesh Rajendran and K. R. Justin Thomas","doi":"10.1039/D6TC00520A","DOIUrl":"https://doi.org/10.1039/D6TC00520A","url":null,"abstract":"<p >Excimer formation is an intrinsic limitation of pyrene-based luminophores, often leading to broadened emission and reduced color purity in the condensed phase. Herein, we report a molecular design strategy to suppress excimer emission by combining steric shielding of the pyrene core with oxidation-state control of a sulfur bridge. Introduction of bulky <em>tert</em>-butyl substituents restricts intermolecular π–π interactions, while coupling with <em>p</em>-toluenethiol followed by stepwise oxidation affords three structurally analogous derivatives: sulfide (<strong>PS</strong>), sulfoxide (<strong>PSO</strong>), and sulfone (<strong>PSO<small>₂</small></strong>). Single-crystal X-ray diffraction analysis reveals that increasing sulfur oxidation enhances molecular rigidity and progressively disrupts cofacial stacking between pyrene units. Consequently, all compounds exhibit higher photoluminescence quantum yields and longer excited-state lifetimes in thin films than in solutions, indicating efficient suppression of aggregation-induced quenching. Photophysical investigations demonstrate a distinct evolution of excited-state character: <strong>PS</strong> shows hybridized local-excited/charge-transfer (HLCT) emission, whereas <strong>PSO</strong> and <strong>PSO<small>₂</small></strong> predominantly display localized excited states. Remarkably, <strong>PSO</strong> exhibits mixed LE–CT emission with an exceptionally narrow full width at half maximum of 28 nm in solution, reflecting a rigid and well-confined excited state. Solvatochromic measurements and quantum chemical calculations consistently support the oxidation-dependent modulation of the emissive state. Additionally, higher sulfur oxidation states impart enhanced thermal stability to the luminophores. This study establishes sulfur oxidation-state engineering as an effective molecular strategy to control packing, excited-state nature, and excimer suppression in pyrene-based emitters, providing fundamental guidelines for designing high-purity solid-state organic luminophores.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 22","pages":" 9760-9772"},"PeriodicalIF":5.1,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148208622","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":"All-solution-processed transparent electrodes consisting of Ag NW/PEDOT:PSS composites on PVDF-HFP flexible substrates for 2.5 V-operating wearable heaters","authors":"Ji-Young You, Gyu-Seon Hwang, Eun-Ha Kim and Tae-Jun Ha","doi":"10.1039/D6TC00267F","DOIUrl":"https://doi.org/10.1039/D6TC00267F","url":null,"abstract":"<p >Flexible transparent electrodes with mechanical flexibility have attracted increased interest as next-generation wearable heaters. In this study, a high-performance wearable transparent heater capable of 2.5 V operation is demonstrated by depositing a Ag nanowire (NW)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite-based heating layer on a flexible poly(vinylidene fluoride-hexafluoropropylene) substrate <em>via</em> an all-solution process. The effects of the concentrations of dimethyl sulfoxide and Zonyl<small>^TM</small> FS-300 on the sheet resistance and heating performance of the PEDOT:PSS film are investigated, with the optimized film demonstrating a low sheet resistance of 5.4 Ω sq<small>⁻¹</small>. Owing to its improved electrical conductivity, the proposed wearable heater exhibits outstanding heating behavior, reaching a temperature of 74 °C at a low applied voltage of 2.5 V. Furthermore, highly stable heating performance during long-term operation for up to 30 days under high-humidity (∼90%) conditions and after repeated bending with a minimum bending radius of 5 mm is achieved. The practical heating applications of the proposed wearable transparent electrodes are demonstrated by conformal attachment to clothing and an eyeglass lens. This work provides an effective platform for low-voltage, flexible, and transparent heating applications, offering strong potential for integration into wearable and portable electronic systems.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 22","pages":" 9810-9821"},"PeriodicalIF":5.1,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148208686","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":"Pressure effects on optical properties of zinc-based 0D hybrid halides","authors":"Yuan Fu, Guoliang Xiao, Xihan Yu, Zhiwei Ma, Dianlong Zhao and Guanjun Xiao","doi":"10.1039/D6TC00252H","DOIUrl":"https://doi.org/10.1039/D6TC00252H","url":null,"abstract":"<p >Zinc-based zero-dimensional (0D) halides with wide-bandgap materials exhibit great potential as a blue-light material system, yet their practical applications are impeded by the low quantum yield. Here, under high pressure, significantly enhanced deep blue emission luminogens are observed in the 0D hybrid halide ZnCl<small>₂</small>-BZT, exhibiting over ten times greater intensity compared to the emission in their initial state at 4.5 GPa. Notably, the “sky blue light” emission is effectively retained under ambient conditions even after the pressure is completely released, which is over seven times more intense than the emission in the initial state, a remarkable quantum yield of 65.52% after decompression, exhibiting potential applications in advanced lighting and display technologies. Experiments and first-principles calculations reveal that the irreversible amorphous states, halogen-to-ligand charge transfer, and increased steric hindrance with respect to complexly configurational organic molecules [BTZ] are highly responsible for the eventual retention of “sky blue light” emission luminogens. The findings signify a notable advancement towards the retention of blue-light emission luminogens under normal environmental conditions, thereby enhancing their possible utilization in solid-state lighting applications.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 22","pages":" 9500-9507"},"PeriodicalIF":5.1,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148208689","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":"Flexible large-area electrochromic devices with enhanced cycling stability enabled by Ni/MnO2 hybrid mesh electrodes","authors":"Mengnan Wang, Chunyang Su, Yinuo Du, Waner Liu, Shiqing Zhao and Yanhua Liu","doi":"10.1039/D6TC00652C","DOIUrl":"https://doi.org/10.1039/D6TC00652C","url":null,"abstract":"<p >The realization of large-area, high-performance flexible electrochromic devices (FECDs) faces significant hurdles, primarily stemming from conductivity limitations in flexible transparent electrodes (FTEs) governing electrochromic uniformity and cycling instability caused by “ion trapping” phenomena and electron/ion conductivity mismatches. Here, we introduce a novel device architecture and fabrication strategy to overcome these challenges. An embedded micrometer-scale nickel (Ni) mesh electrode was firstly introduced and then manganese dioxide (MnO<small>₂</small>) was precisely deposited onto the Ni surface. This innovation not only ensures high optical transparency but also facilitates efficient ion and electron transport by balancing the charge capacities between MnO<small>₂</small> and tungsten oxide (WO<small>₃</small>) films that significantly enhance device cycling stability. We also demonstrate an 8 × 8 cm<small>²</small> flexible electrochromic device based on this Ni/MnO<small>₂</small> hybrid electrode architecture, achieving an optical modulation range of 64%, coloration/bleaching times of 6 s/8 s, and a coloring efficiency of 153.81 cm<small>²</small> C<small>⁻¹</small>. The device exhibits exceptional cycling stability (retaining 99% of its optical modulation after 150 cycles) and outstanding flexibility (displaying only 6% modulation loss after 300 bending cycles at 60° curvature). We believe that our FECDs will accelerate the development of large-area patterned flexible displays and wearable electronics.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 24","pages":" 10592-10599"},"PeriodicalIF":5.1,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148314669","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":"On-demand optical printing of Ag-based neuromorphic devices for brain-inspired learning","authors":"Bharath Bannur and Sajan D. George","doi":"10.1039/D6TC00516K","DOIUrl":"https://doi.org/10.1039/D6TC00516K","url":null,"abstract":"<p >Neuromorphic computing, in which memory and computation occur in the same physical system, promises to overcome the von Neumann bottleneck by mimicking the massively parallel architecture of biological neural networks. Self-formed networks with disordered, nonlinear connectivity are especially promising for synaptic plasticity, but fabrication often demands vacuum deposition or complex chemical processing, limiting broader accessibility and adoption. Here, we present the rapid, on-demand optical printing of an Ag nanoparticle assembly to form a continuous film, followed by an annealing method. The film spontaneously transforms into disconnected Ag nanostructures with tunable morphologies. By systematically varying the printing time and annealing conditions, we realize Ag-based neuromorphic devices showing reliable resistive switching, short- and long-term potentiation, and, importantly, arousal-dependent performance, classically described by the Yerkes–Dodson law, all achieved without external CMOS circuitry. This approach offers a reproducible, cost-effective, and scalable route to self-organized Ag networks, bypassing the constraints of traditional vacuum or chemically intensive methods. These devices, based on emergent architectures, open up pathways toward scalable, adaptive hardware for advanced neuromorphic computing.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 18","pages":" 7531-7539"},"PeriodicalIF":5.1,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2026/tc/d6tc00516k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147923924","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":"Biomass-derived white-light-emitting carbon dots for white LEDs","authors":"Akella Sai Radha Aishwarya, Bhargav Jyoti Bora and Mari Annadhasan","doi":"10.1039/D6TC00203J","DOIUrl":"https://doi.org/10.1039/D6TC00203J","url":null,"abstract":"<p >Carbon dots (CDs) sourced from sustainable natural resources have emerged as promising materials owing to their eco-friendly, cost-effective, size-dependent optical tunability for next-generation solid-state lighting. Here, we synthesized white-light-emitting carbon dots (WLE-CDs) <em>via</em> a one-pot solvothermal approach from the leaves of a medicinal plant, <em>Epiphyllum oxypetalum</em>, with CIE coordinates centered at (0.31, 0.33). Optimizations were done by varying the temperature and time of the synthesis conditions, yielding WLE-CDs, which remain challenging despite their potential in advancing CD-based white-light-emitting diode (WLED) technology. Notably, under 410 nm excitation, the CDs exhibited emission covering the entire visible spectrum, with a quantum yield of 34.96%. In order to capitalize on this, a WLED was fabricated with CIE coordinates of (0.31, 0.34), a CRI of 81%, and a CCT of 6467 K with a cool white tone suited for functional and high-visibility environments. This study outlines the potential of biomass-derived CDs as a sustainable white phosphor material for optoelectronic applications.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 24","pages":" 10613-10622"},"PeriodicalIF":5.1,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148314668","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":"All sites’ systematic non-stoichiometric regulation of ordering-related structure and microstructure for enabling ultralow dielectric loss and temperature stability in Ba(Mg1/3Nb2/3)O3 perovskite ceramics","authors":"Yangyang Liu, Maosen Fu, Xiao Ma, Lin Zhang, Hanju Guo, Jiayin Li and Lei Ni","doi":"10.1039/D5TC04434K","DOIUrl":"https://doi.org/10.1039/D5TC04434K","url":null,"abstract":"<p >This study employs non-stoichiometric design at distinct chemical sites within the perovskite structure to systematically investigate the influence of the oxygen octahedra state, B-site cation ordering, ordered domain, and grain size on the dielectric properties within the Ba(Mg<small>_1/3</small>Nb<small>_2/3</small>)O<small>₃</small> system and identifies strategies for enhancing the properties in 1 : 2 ordered perovskite ceramics. Both A-site deficiency and B″-site excess are effective in substantially reducing the sintering temperature (reduced by 200–250 °C) of the Ba(Mg<small>_1/3</small>Nb<small>_2/3</small>)O<small>₃</small> ceramics by reducing the required activation energy, which is beneficial for reducing energy consumption. Through its significant effect on the densification temperature, non-stoichiometry profoundly modifies the grain size and grain boundary density of the ceramics. It is found that non-stoichiometry effectively regulates the cation ordering degree and ordered domain in Ba(Mg<small>_1/3</small>Nb<small>_2/3</small>)O<small>₃</small> ceramics by fundamentally altering the kinetics and pathway of its formation. It is demonstrated that within a single phase, densely ordered perovskite ceramics, grain size and cation ordering degree jointly modulate the quality factor. Notably, the contribution of the ordering degree to the <em>Q</em> × <em>f</em> exhibits a critical grain size effect, as confirmed through systematic investigation. Ultra-high values of the quality factor (<em>Q</em> × <em>f</em> = 111 500 GHz) were attained in Mg-deficient samples, attributed to a favorable balance between grain boundary loss and cation ordering degree; this value represents an increase by a factor of nearly two compared with that of the stoichiometric composition (<em>Q</em> × <em>f</em> = 54 800 GHz). Furthermore, non-stoichiometry significantly reduces <em>τ</em><small>_<em>f</em></small> through the modulation of oxygen octahedral tilting, thereby enhancing temperature stability. This study provides a viable strategy for modulating the microwave dielectric properties of ordered perovskite microwave dielectric ceramics.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 22","pages":" 9476-9486"},"PeriodicalIF":5.1,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148208690","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":"Unveiling asymmetric thermo–mechanical coupling for enhanced energy harvesting: a lead-free BCT–BST based pyro–piezoelectric hybrid nanogenerator","authors":"Kun Zhao, Shujia Wang, Yujia Liu, Xinhe Wu and Xiaobin Yan","doi":"10.1039/D6TC00382F","DOIUrl":"https://doi.org/10.1039/D6TC00382F","url":null,"abstract":"<p >Pyroelectric nanogenerators (PyNGs) and piezoelectric nanogenerators (PENGs) have great potential for harvesting thermal and mechanical energy, yet the combined influence of temperature and force on the output performance of pyro–piezoelectric hybrid nanogenerators (HNGs) remains insufficiently understood, limiting their optimization for multi-energy harvesting. To address this, we report a high-performance pyro–piezoelectric HNG based on a 0.55(Ba<small>_0.9</small>Ca<small>_0.1</small>)TiO<small>₃</small>–0.45Ba(Sn<small>_0.2</small>Ti<small>_0.8</small>)O<small>₃</small> (BCT–BST) ceramic wafer exhibiting a high piezoelectric coefficient and systematically investigate its thermo–mechanical coupling mechanism. A key finding is the distinct asymmetric response of the device: compared to the pure piezoelectric output (54.4 nA), simultaneous heating and force suppressed the current by 41.4%, whereas simultaneous cooling and force enhanced it by 13.4%. This behavior is explained by the modulation of band bending caused by the interplay between pyroelectric and piezoelectric effects. Leveraging the optimal cooling-force condition, the device demonstrated rapid energy-storage capability, charging a 4.7 µF capacitor to 3 V within only 46 s. Moreover, it exhibited excellent stability during 9 h of continuous operation. This work not only reveals the great potential of lead-free ceramics in multi-source energy harvesting but also establishes a fundamental principle for designing high-performance pyro–piezoelectric HNGs.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 24","pages":" 10788-10797"},"PeriodicalIF":5.1,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148314697","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":"Targeted fluorescence enhancement of acridones by hydrogen bonding in solution and solid state","authors":"Matthias Jantz, David Klaverkamp, Benedikt Bendel, Takin Haj Hassani Sohi, Martin H. Polko, Lennart Bunnemann, Tobias Böhmer, Markus Putscher, Christel M. Marian, Constantin Czekelius, Vera Vasylyeva, Markus Suta and Peter Gilch","doi":"10.1039/D5TC03885E","DOIUrl":"https://doi.org/10.1039/D5TC03885E","url":null,"abstract":"<p >The fluorescence of many aromatic carbonyl compounds is strongly enhanced by protic solvents. Yet, not all applications allow for protic surroundings. Employing steady state and time-resolved spectroscopy it is shown that <em>N</em>-methylacridone (NMA) forms a hydrogen-bonded conjugate with urea derivatives (Schreiner's catalyst, SCat). In toluene solution, the hydrogen bonding results in a 9-fold increase of the fluorescence quantum yield. As evidenced by X-ray crystallography, NMA and SCat form a co-crystal featuring a 3-fold increased fluorescence quantum yield. It further exhibits sharper fluorescence bands. By the aid of quantum-chemical computations, the increased fluorescence quantum yields are attributed to an energetic up-shift of nπ* states.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 22","pages":" 9640-9653"},"PeriodicalIF":5.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2026/tc/d5tc03885e?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148208675","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":"Radiation-hard organic electronics via perylenediimide core engineering","authors":"Sergey A. Kuklin, Petr M. Kuznetsov, Valeria S. Bolshakova, Gennady V. Shilov, Alexander V. Mumyatov, Mikhail V. Zhidkov, Galina A. Kichigina, Pavel P. Kushch, Evgeny V. Golosov, Dmitry P. Kiryukhin and Pavel A. Troshin","doi":"10.1039/D5TC04384K","DOIUrl":"https://doi.org/10.1039/D5TC04384K","url":null,"abstract":"<p >This first systematic study of gamma ray exposure on perylenediimide (PDI) semiconductors reveals their outstanding radiation hardness, unlocking potential for extreme-environment electronics. By investigating a series of functionalized PDIs in two complementary device platforms (lateral resistors and OFETs), we demonstrate that radiation sensitivity can be effectively tuned <em>via</em> molecular design. Bay-cyano functionalization yields highly responsive materials, while the incorporation of a selenium bridge enables exceptional radiation tolerance. OFETs based on the rationally designed material show no performance degradation and even improve their characteristics after exposure to 500 kGy of gamma rays—a dose that would severely degrade conventional silicon electronics. Mechanistic insights from ESR spectroscopy and MALDI ToF mass spectrometry analysis suggest a radical-based degradation pathway, further informing rational material design. These findings position rationally engineered organic semiconductors as a promising new class of radiation-hardened materials for applications in space, nuclear power plants, and medical technologies.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 24","pages":" 10730-10736"},"PeriodicalIF":5.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148314687","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}