Journal of Materials Chemistry C最新文献

{"title":"The interplay between magnetism and structure in Co/Fe-CdSe diluted magnetic quantum dots","authors":"Fatma Ibraheem, Esraa Gabrouny, Shaimaa Nadi, Manal A. Mahdy, Iman A. Mahdy, J. Enrique Ortega, Celia Rogero, Martina Corso, Afaf El-Sayed","doi":"10.1039/d4tc02713b","DOIUrl":"https://doi.org/10.1039/d4tc02713b","url":null,"abstract":"Magnetic dopants are commonly employed to modify the characteristics of dilute magnetic quantum dots (DMQDs), resulting in a significant alteration in their magnetic ground state. A thorough investigation of the structural changes induced by the dopants during DMQD growth is pivotal to comprehending the magnetic state of the system. In this regard, we employed the well-established organometallic route to manufacture CdSe QDs with trace amounts of Co and Fe, and we halted their growth process at two different stages. Subsequently, we utilized high-resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, photoluminescence, and vibrating sample magnetometry to examine the interplay between each structure and its magnetic properties. Our analyses reveal that Co ions form a β-Co(OH)<small>₂</small> shell on the surface of the CdSe QD, changing the diamagnetism of the pure CdSe matrix into soft-ferromagnetism of the DMQD at a low magnetic field, accompanied by a substantial enhancement in photoluminescence, amounting to approximately 250% in comparison to the pure CdSe QDs. In contrast, Fe ions form a FeSe structure in the core of the CdSe QD, leading to a room-temperature ferromagnetic DMQD. Both DMQDs are potential candidates for quantum information storage and processing, enabling the development of advanced quantum technologies.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221529","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":"Design of alkali lead oxybromides with a strong second-harmonic generation response and large birefringence","authors":"Jialin Zeng, Shuangcheng Li, Yahui Zhu, Zilong Geng, Yiting Luo, Ruibiao Fu, Zuju Ma","doi":"10.1039/d4tc02947j","DOIUrl":"https://doi.org/10.1039/d4tc02947j","url":null,"abstract":"Nonlinear optical (NLO) crystals are of importance in modern lasers, high-precision micromachining, ultrahigh resolution photolithography and advanced scientific equipment. Herein, we have rationally obtained two new lead oxybromides, A<small>₃</small>[Pb<small>₂</small>Br<small>₅</small>(OOC(CH<small>₂</small>)<small>₃</small>COO)] (A = Rb, Cs), with a strong second-harmonic generation (SHG) response and large birefringence. Two neighboring highly distorted [PbBr<small>₄</small>O<small>₂</small>] polyhedrons with high polarizability and anisotropic polarization are bridged by the flexible glutarate group and one Br<small>⁻</small> anion to form a large [Pb<small>₂</small>Br<small>₇</small>(OOC(CH<small>₂</small>)<small>₃</small>COO)] group. Interestingly, the large [Pb<small>₂</small>Br<small>₇</small>(OOC(CH<small>₂</small>)<small>₃</small>COO)] groups are induced by Rb<small>⁺</small>/Cs<small>⁺</small> cations into an oriented alignment, leading to the effective superimposition of their microscopic second-order susceptibility and the enhancement of optical anisotropy. Notably, Rb<small>₃</small>[Pb<small>₂</small>Br<small>₅</small>(OOC(CH<small>₂</small>)<small>₃</small>COO)] exhibits good comprehensive NLO performance, including a strong phase-matching SHG response of 3.1 × KDP, a large birefringence of 0.207@546 nm, a wide high transparency window, easy growth of large single crystals, as well as good thermal stability up to 240 °C under an air atmosphere. On the basis of their crystal structures and theoretical calculations, their strong SHG responses mainly stem from the highly distorted [PbBr<small>₄</small>O<small>₂</small>] polyhedron. This research provides an effective strategy for the design and pursuit of high-performance NLO crystals in the future.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221533","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":"2D MoS2 photovoltaic detectors with a switchable mode","authors":"Yujue Yang, Ziyu Li, Huafeng Dong, Xin Zhang, Fugen Wu, Nengjie Huo","doi":"10.1039/d4tc03280b","DOIUrl":"https://doi.org/10.1039/d4tc03280b","url":null,"abstract":"Photodetectors based on two-dimensional (2D) materials have demonstrated their advantages of low-cost, high-performance, small-size, flexibility and large-scale manufacture. In this work, 2D MoS<small>₂</small>-based photovoltaic detectors with a switchable mode have been achieved through a Schottky and lateral PN homojunction. By applying different bias voltages, the photodetection mode can be switched between the photodiode and photoconductor, combining the advantageous features of both modes in one device. In the photodiode mode, a significant rectifying and photovoltaic behavior can be achieved and tuned by the gate voltages, achieving a fast photo-response speed of ∼10 ms. In the photoconductor mode, the photoconductive effect can lead to a photo-gain mechanism, a high responsivity up to 10<small>³</small> A W<small>⁻¹</small> and a high detectivity of 4.1 × 10<small>¹²</small> Jones in the Schottky device. This work develops a MoS<small>₂</small> photodetector based on a Schottky and PN homojunction using a facile method, and the switchable operation mode endows our device with the capability of customized photodetection applications for different needs.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221535","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":"Optoelectronic characteristics of furan substituted thiophene/phenylene co-oligomer single crystals for organic lasing","authors":"Periyasamy Angamuthu Praveen, Thangavel Kanagasekaran, Chaoyan Ma, Masahiro Terada, Tienan Jin, Yusuke Wakabayashi, Hidekazu Shimotani","doi":"10.1039/d4tc03149k","DOIUrl":"https://doi.org/10.1039/d4tc03149k","url":null,"abstract":"We design and synthesise an organic lasing system, 2,5-bis(5-[1,1′-biphenyl]-4-ylthiophen-2-yl)furan, which has advanced optoelectronic properties. Grown as a single crystal, this monoclinic system exhibits typical H-aggregation and has a photoluminescence quantum yield of 29% and ambipolar field effect mobilities of approximately 0.7 (hole) and 0.1 (electron) cm<small>²</small> V<small>⁻¹</small> s<small>⁻¹</small>. The system is validated for its suitability towards laser development, and it exhibits excellent gain along with dual gain-narrowing emission in the yellow region. It has superior optical and electrical properties compared to its structural counterpart and similar systems. The system can be further developed by incorporating a planar resonator structure and using contact engineering techniques to realise electrically driven semiconductor lasers.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221530","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":"A multidimensional anti-counterfeiting dynamic flexible label based on light/thermal responsive CLC microspheres†","authors":"Qingxiu Wang, Dong Zhou, Kai Gong, Xinpeng Lv, Peng Li and Yongjun Liu","doi":"10.1039/D4TC02630F","DOIUrl":"10.1039/D4TC02630F","url":null,"abstract":"<p >Compared to static anti-counterfeiting, polymorphic dynamic anti-counterfeiting typically incorporates additional parameters specifically to increase the complexity of decryption. The development of security in flexible multi-dimensional materials holds significant implications for anti-counterfeiting applications in pharmaceuticals, food, and other products, yet it presents considerable challenges. Here, we propose a composite hydrogel film based on cholesteric liquid crystal (CLC) microspheres with photochromic spiropyran (SP) dyes and sodium alginate/<em>N</em>-isopropyl acrylamide. The film incorporates microspheres capable of synergistic color changes under light/heat stimuli. In the temperature range of 30–12 °C, CLC microspheres can achieve color tuning in the entire visible light band. By incorporating SP, the liquid crystal structural color can overlap with SP fluorescence/dye color. Furthermore, as a soft actuator, the flexible composite hydrogel can achieve a range of predesigned dynamic actuation effects such as biomimetic butterflies and flowers. By integrating the CLC microspheres with actuatable composite hydrogels, a sophisticated multidimensional dynamic anti-counterfeiting flexible label has been successfully realized. This not only enhances security and complexity in multidimensional dynamic anti-counterfeiting but also holds significant potential for applications in dynamic camouflage, bio-inspired actuation, and display sensing.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221527","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":"Unlocking non-characteristic near-infrared emission of rare earth ions for photosynthetic bacteria cultivation and vein imaging applications†","authors":"He Lin, Shuangqiang Fang, Tianchun Lang, Jiali Yu, Haoliang Cheng, Jiaqi Ou, Zhijie Ye, Renjie Xu, Xiulan Shui, Haolin Qu and Le Wang","doi":"10.1039/D4TC02130D","DOIUrl":"10.1039/D4TC02130D","url":null,"abstract":"<p >Near-infrared (NIR) luminescent materials exhibit unique photophysical properties that make them crucial components in photobiological, photonic and optoelectronic applications. Nonetheless, almost all rare earth ions are difficult to be efficiently excited by blue light for NIR emission, mainly due to the inherent electron shielding effect of 5s<small>²</small>5p<small>⁶</small> orbitals. Here, an amazing enhancement of the Tm<small>^{3+ 3}</small>H<small>₄</small> → <small>³</small>H<small>₆</small> transition (800 nm) was achieved in the SrGa<small>₁₂</small>O<small>₁₉</small> host upon 450 nm excitation. Compared with the Tm<small>³⁺</small> single-doped sample, the internal quantum efficiency (IQE) in the 700–900 nm range was significantly improved from less than 1% to 74%, and the external quantum efficiency (EQE) was enhanced from nearly 0 to 33%, benefitting from the synergistic effect of Cr<small>³⁺</small> contribution and electron shielding effect breaker of In<small>³⁺</small>. XRD structure refinement, time-resolved fluorescence spectroscopy and electron paramagnetic resonance were used to determine the effect of Cr<small>³⁺</small> and In<small>³⁺</small> doping. Furthermore, the universality of this strategy has also been verified with other rare earth ions (Ho<small>³⁺</small>, Nd<small>³⁺</small>, and Yb<small>³⁺</small>). Finally, a NIR phosphor-converted LED (pc-LED) is fabricated, exhibiting a satisfactory output power of 141 mW@500 mA and demonstrating the potential for photosynthetic bacteria culture, venous imaging and non-destructive testing. This work opens a window for blue light-pumped NIR emission of rare earth ions.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221532","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 thermal conductivity of polymeric composites with BN@C hybrid fillers","authors":"Xuang Bai, Yuhang Meng, Fanyu Zhou, Cong Ge, Dandan Sun, Dehong Yang, Xiangfen Jiang, Pengcheng Dai, Xuebin Wang","doi":"10.1039/d4tc02766c","DOIUrl":"https://doi.org/10.1039/d4tc02766c","url":null,"abstract":"The issue of heat accumulation caused by the low thermal conductivity (TC) of polymers widely used in electronic devices has become a block for chip development. Enhancing the overall TC by adding high-TC fillers to polymers to create composites is considered one of the promising solutions. However, adding a single filler to the polymer may lead to issues such as high interfacial thermal resistance between fillers. Here, we developed a boron nitride@carbon particle (BN@C) hybrid filler by <em>in situ</em> growth of carbon particles on the surface of BN and constructed BN@C/epoxy composites. The presence of carbon bridged the BN and prevented its agglomeration, forming a smooth and efficient thermal conduction network. Consequently, the TC of the composite reached 1.69 W m<small>⁻¹</small> K<small>⁻¹</small> at a 60 wt% load. Additionally, it exhibited excellent thermal stability, mechanical and dielectrical properties, and breakdown strength. This study provides an effective strategy for manufacturing high-TC polymeric composites for electronic devices.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221531","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":"CuX-Based MOFs as functional materials for adsorption, catalytic, and sensing applications","authors":"Léo Boivin and Pierre D. Harvey","doi":"10.1039/D4TC03093A","DOIUrl":"10.1039/D4TC03093A","url":null,"abstract":"<p >Metal–organic frameworks (MOFs) built with nodes of copper(<small>I</small>) halides as metallic nodes have experienced a recent increase in interest as these porous materials exhibit rich physical, photophysical, and chemical properties and applications. In this comprehensive review, these properties and applications are surveyed and described, and include highly luminescent materials exhibiting long-lived excited state lifetimes, high triplet populations, large Stokes shift, <em>etc.</em>, which are also of high porosity and rigidity. The auspicious combination of these properties lends them interesting applications such as selective gas adsorption and separation, capture of pollutants, catalysis, and sensing, among others.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221534","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":"Symmetry-informed design of magnetoelectric coupling in the manganite perovskite CeBaMn2O6†","authors":"Struan Simpson, Cameron A. M. Scott, Fernando Pomiro, Jeremiah P. Tidey, Urmimala Dey, Fabio Orlandi, Pascal Manuel, Martin R. Lees, Zih-Mei Hong, Wei-tin Chen, Nicholas C. Bristowe and Mark S. Senn","doi":"10.1039/D4TC02743D","DOIUrl":"10.1039/D4TC02743D","url":null,"abstract":"<p >Magnetoelectric multiferroics hold great promise for the development of new sustainable memory devices. However, practical applications of many existing multiferroic materials are infeasible due to the weak nature of the coupling between the magnetic and electrical orderings, meaning new magnetoelectric multiferroics featuring intrinsic coupling between their component orderings are sought instead. Here, we apply a symmetry-informed design approach to identify and realize the new manganite perovskite CeBaMn<small>₂</small>O<small>₆</small> in which magnetoelectric coupling can be achieved <em>via</em> an intermediary non-polar structural distortion. Through first-principles calculations, we demonstrate that our chosen prototype system contains the required ingredients to achieve the desired magnetoelectric coupling. Using high-pressure/high-temperature synthesis conditions, we have been able to synthesize the CeBaMn<small>₂</small>O<small>₆</small> perovskite system for the first time. Our subsequent neutron and electron diffraction measurements reveal that the desired symmetry-breaking ingredients exist in this system on a nanoscopic length scale, enabling magnetoelectric nanoregions to emerge within the material. Through this work, we showcase the potential of the new CeBaMn<small>₂</small>O<small>₆</small> perovskite material as a promising system in which to realize strong magnetoelectric coupling, highlighting the potential of our symmetry-informed design approach in the pursuit of new magnetoelectric multiferroics for next-generation memory devices.</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":"https://pubs.rsc.org/en/content/articlepdf/2024/tc/d4tc02743d?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221537","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(corannulenyl)ethene as an efficient photochromic material","authors":"Ryuta Imai, Shouhei Katao, Fumio Asanoma, Tsuyoshi Kawai, Mihoko Yamada","doi":"10.1039/d4tc03175j","DOIUrl":"https://doi.org/10.1039/d4tc03175j","url":null,"abstract":"We herein report photochromic 1,2-bis(2-methoxy-corannulenyl)perfluorocyclopentene (<strong>1</strong>) possessing two corannulene moieties as the side aryl units of diarylethene. One enantiomer and the other enantiomer of one chiral atropisomer of <strong>1</strong> respectively forming columnar structures in the crystal were revealed <em>via</em> single-crystal X-ray analysis. Compound <strong>1</strong> exhibited an efficient photochromic behaviour with a large molar absorption coefficient of 5.0 × 10<small>⁴</small> M<small>⁻¹</small> cm<small>⁻¹</small>, and significantly high photochemical quantum yields of 0.64 and 0.49 were demonstrated for photocyclization and photocycloreversion reactions, respectively. This high efficiency was rationalized by the changed abundance ratios of atropisomers between the open- and closed-isomers and the shortened distance between reactive carbons with the help of the curved structure. In addition, the application possibility of <strong>1</strong> as a photochromic material was demonstrated in a poly(methyl methacrylate) film.","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":"142221540","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}