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1دورية أكاديمية
المؤلفون: Xianyuan Liu, Jinman Zhou, Ying Xue, Xianyong Lu
المصدر: Nano-Micro Letters, Vol 16, Iss 1, Pp 1-17 (2024)
مصطلحات موضوعية: Electromagnetic wave absorption, Hierarchical structure, In situ growth, Self-reduction, Technology
الوصف: Highlights Hierarchical Fe3O4-Fe@CNFs/Al-Fe3O4-Fe nanocomposites were constructed by in situ growth, vacuum-assisted filtration, and self-reduction methods. The carbon framework, with in situ grown magnetic nanoparticles, supports two-dimensional magnetic nanosheets, achieving excellent electromagnetic performance and good impedance matching. Excellent reflection loss value (− 59.3 dB), broadband wave absorption (5.6 GHz at 2.2 mm thickness), and low radar cross-section value were achieved.
وصف الملف: electronic resource
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2دورية أكاديمية
المؤلفون: Jing Qiao, Qinghua Song, Xue Zhang, Shanyu Zhao, Jiurong Liu, Gustav Nyström, Zhihui Zeng
المصدر: Advanced Science, Vol 11, Iss 19, Pp n/a-n/a (2024)
مصطلحات موضوعية: aerogel, cellulose nanofibril, in situ growth, metal–organic framework, multifunctional, Science
الوصف: Abstract Improving interface connectivity of magnetic nanoparticles in carbon aerogels is crucial, yet challenging for assembling lightweight, elastic, high‐performance, and multifunctional carbon architectures. Here, an in situ growth strategy to achieve high dispersion of metal–organic frameworks (MOFs)‐anchored cellulose nanofibrils to enhance the interface connection quality is proposed. Followed by a facile freeze‐casting and carbonization treatment, sustainable biomimetic porous carbon aerogels with highly dispersed and closely connected MOF‐derived magnetic nano‐capsules are fabricated. Thanks to the tight interface bonding of nano‐capsule microstructure, these aerogels showcase remarkable mechanical robustness and flexibility, tunable electrical conductivity and magnetization intensity, and excellent electromagnetic wave absorption performance. Achieving a reflection loss of −70.8 dB and a broadened effective absorption bandwidth of 6.0 GHz at a filling fraction of merely 2.2 wt.%, leading to a specific reflection loss of −1450 dB mm−1, surpassing all carbon‐based aerogel absorbers so far reported. Meanwhile, the aerogel manifests high magnetic sensing sensibility and excellent thermal insulation. This work provides an extendable in situ growth strategy for synthesizing MOF‐modified cellulose nanofibril structures, thereby promoting the development of high‐value‐added multifunctional magnetic carbon aerogels for applications in electromagnetic compatibility and protection, thermal management, diversified sensing, Internet of Things devices, and aerospace.
وصف الملف: electronic resource
العلاقة: https://doaj.org/toc/2198-3844Test
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3دورية أكاديمية
المؤلفون: Yo Han Kim, Hyeongwon Jeong, Bo-Ram Won, Hyejin Jeon, Chan-ho Park, Dayoung Park, Yeeun Kim, Somi Lee, Jae-ha Myung
المصدر: Nano-Micro Letters, Vol 16, Iss 1, Pp 1-35 (2023)
مصطلحات موضوعية: Supported nanoparticle, Exsolution, In situ growth, Mechanism, Perovskite oxide, Catalyst, Technology
الوصف: Highlights Fundamental mechanisms in terms of driving force, material design, and exsolution processes are outlined, and novel behaviors of socketing and shape-shifting throughout the interaction with the oxide support are discussed. This review examines the key control factors, encompassing external conditions and intrinsic properties that affect the surface exsolution of metallic nanoparticles. The extraordinary nature of exsolution particles and their effect on various applications are discussed, along with the latest strategies for improving exsolution behavior.
وصف الملف: electronic resource
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4دورية أكاديمية
المؤلفون: Vinnacombe-Willson, Gail, Conti, Ylli, Jonas, Steven, Mihi, Agustín, Scarabelli, Leonardo, Weiss, Paul
المصدر: Advanced Materials. 34(37)
مصطلحات موضوعية: bottom-up synthesis, in situ growth, lattice plasmon resonance, plasmonic arrays
الوصف: Precise arrangements of plasmonic nanoparticles on substrates are important for designing optoelectronics, sensors and metamaterials with rational electronic, optical and magnetic properties. Bottom-up synthesis offers unmatched control over morphology and optical response of individual plasmonic building blocks. Usually, the incorporation of nanoparticles made by bottom-up wet chemistry starts from batch synthesis of colloids, which requires time-consuming and hard-to-scale steps like ligand exchange and self-assembly. Herein, an unconventional bottom-up wet-chemical synthetic approach for producing gold nanoparticle ordered arrays is developed. Water-processable hydroxypropyl cellulose stencils facilitate the patterning of a reductant chemical ink on which nanoparticle growth selectively occurs. Arrays exhibiting lattice plasmon resonances in the visible region and near infrared (quality factors of >20) are produced following a rapid synthetic step (
وصف الملف: application/pdf
الوصول الحر: https://escholarship.org/uc/item/2n36g8drTest
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5دورية أكاديمية
المؤلفون: Tianhu Gui, Xue Xia, Bohan Wei, Jingni Zhang, Kai Zhang, Yang Li, Weiqiang Chen, Wenzhi Yu, Nan Cui, Haoran Mu, Yun Li, Shusheng Pan, Shenghuang Lin
المصدر: Materials & Design, Vol 238, Iss , Pp 112722- (2024)
مصطلحات موضوعية: In situ growth, Van der Waals heterojunction, Self-powered, Broadband, Materials of engineering and construction. Mechanics of materials, TA401-492
الوصف: Two-dimensional transition metal dichalcogenides (2DTMDs) and their van der Waals heterojunctions (vdWHs) have garnered significant attention working as the channel material of optoelectronics. The development of new heterojunction growth schemes may also provide better performance for optoelectronic devices. In this paper, PtSe2 thin films with controllable size and thickness are directly grown on MoS2 nanosheet by sputtering-selenization two-step growth method. The photodetector with PtSe2/MoS2 heterojunction exhibits a type-I band alignment and leads to an impressive broadband spectral photoresponse (405 to 1550 nm). It can achieve responsivity as high as 5.42 A/W, a detectivity of 2.52 × 1010 Jones, and a fast response rate (92/112 μs for rise/fall time respectively). In addition, the device has excellent stability in the air atmosphere and keeps its photoresponse after even six months. The in-situ growth method provides a new scheme to construct heterojunctions of 2DTMDs and develop energy-efficient photodetectors with enhanced performance. It also supplements the practical production and application of large-scale broadband detectors.
وصف الملف: electronic resource
العلاقة: http://www.sciencedirect.com/science/article/pii/S0264127524000947Test; https://doaj.org/toc/0264-1275Test
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6دورية أكاديمية
المؤلفون: Yiduo Wang, Yingwei Wang, Yulan Dong, Li Zhou, Jianlong Kang, Ning Wang, Yejun Li, Xiaoming Yuan, Zhengwei Zhang, Han Huang, Mengqiu Long, Si Xiao, Jun He
المصدر: Opto-Electronic Advances, Vol 6, Iss 10, Pp 1-11 (2023)
مصطلحات موضوعية: mxenes, optical properties modulation, in situ growth, carriers transfer, nonlinear optical absorption, Optics. Light, QC350-467
الوصف: Two-dimensional (2D) nonlinear optical mediums with high and tunable light modulation capability can significantly stimulate the development of ultrathin, compact, and integrated optoelectronics devices and photonic elements. 2D carbides and nitrides of transition metals (MXenes) are a new class of 2D materials with excellent intrinsic and strong light-matter interaction characteristics. However, the current understanding of their photo-physical properties and strategies for improving optical performance is insufficient. To address this issue, we rationally designed and in situ synthesized a 2D Nb2C/MoS2 heterostructure that outperforms pristine Nb2C in both linear and nonlinear optical performance. Excellent agreement between experimental and theoretical results demonstrated that the Nb2C/MoS2 inherited the preponderance of Nb2C and MoS2 in absorption at different wavelengths, resulting in the broadband enhanced optical absorption characteristics. In addition to linear optical modulation, we also achieved stronger near infrared nonlinear optical modulation, with a nonlinear absorption coefficient of Nb2C/MoS2 being more than two times that of the pristine Nb2C. These results were supported by the band alinement model which was determined by the X-ray photoelectron spectroscopy (XPS) experiment and first-principal theory calculation. The presented facile synthesis approach and robust light modulation strategy pave the way for broadband optoelectronic devices and optical modulators.
وصف الملف: electronic resource
العلاقة: https://doaj.org/toc/2096-4579Test
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7دورية أكاديمية
المصدر: Molecules, Vol 29, Iss 11, p 2505 (2024)
مصطلحات موضوعية: metal–organic frameworks, in situ growth, UiO-66, fast separation, gas chromatography, Organic chemistry, QD241-441
الوصف: The thermally stable zirconium-based MOF, UiO-66, was employed for the preparation of bonded porous-layer open-tubular (PLOT) GC columns. The synthesis included the in situ growth of the UiO-66 film on the inner wall of the capillary through a one-step solvothermal procedure. SEM–EDX analysis revealed the formation of a thin, continuous, uniform, and compact layer of UiO-66 polycrystals on the functionalized inner wall of the column. The average polarity (ΔIav = 700) and the McReynolds constants reflected the polar nature of the UiO-66 stationary phase. Several mixtures of small organic compounds and real samples were used to evaluate the separation performance of the fabricated columns. Linear alkanes from n-pentane to n-decane were baseline separated within 1.35 min. Also, a series of six n-alkylbenzenes (C3–C8) were separated within 3 min with a minimum resolution of 3.09, whereas monohalobenzene mixtures were separated at 220 °C within 14s. UiO-66 PLOT columns are ideally suited for the isothermal separation of chlorobenzene structural isomers at 210 °C within 45 s with Rs ≥ 1.37. The prepared column featured outstanding thermal stability (up to 450 °C) without any observed bleeding or significant impact on its performance. This feature enabled the analysis of various petroleum-based samples.
وصف الملف: electronic resource
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8دورية أكاديمية
المؤلفون: Mengfan Mao, Yexin Zu, Yating Zhang, Yongzhen Qiu, Yue Lin, Fang Luo, Zuquan Weng, Cuiying Lin, Bin Qiu, Zhenyu Lin
مصطلحات موضوعية: Molecular Biology, Environmental Sciences not elsewhere classified, Biological Sciences not elsewhere classified, situ growth approach, photogenerated charge carriers, exceptional optoelectronic characteristics, highly promising class, relatively weak stability, 3 , 2 , resulting composite material, composite material comprising, remarkable detection limit, 801 may serve, demonstrates outstanding stability, composite material, highly suitable, 801 demonstrates, thereby mitigating, structural alteration, sensor exhibits, robust foundation, rat brains, protective barrier, precise quantification, photoelectrochemical sensor, photoelectric materials, perovskite materials, inherent reactivity, future commercialization
الوصف: Halide perovskites have emerged as a highly promising class of photoelectric materials. However, the application of lead-based perovskites has been hindered by their toxicity and relatively weak stability. In this work, a composite material comprising a lead-free perovskite cesium copper iodide (CsCu 2 I 3 ) nanocrystal and a metal–organic framework (MOF-801) has been synthesized through an in situ growth approach. The resulting composite material, denoted as CsCu 2 I 3 /MOF-801, demonstrates outstanding stability and exceptional optoelectronic characteristics. MOF-801 may serve a dual role by acting as a protective barrier between CsCu 2 I 3 nanocrystals and the external environment, as well as promoting the efficient transfer of photogenerated charge carriers, thereby mitigating their recombination. Consequently, CsCu 2 I 3 /MOF-801 demonstrates its utility by providing both stability and a notably high initial photocurrent. Leveraging the inherent reactivity between H 2 S and the composite material, which results in the formation of Cu 2 S and structural alteration, an exceptionally sensitive photoelectrochemical sensor for H 2 S detection has been designed. This sensor exhibits a linear detection range spanning from 0.005 to 100 μM with a remarkable detection limit of 1.67 nM, rendering it highly suitable for precise quantification of H 2 S in rat brains. This eco-friendly sensor significantly broadens the application horizon of perovskite materials and lays a robust foundation for their future commercialization.
الإتاحة: https://doi.org/10.1021/acs.analchem.4c00041.s001Test
https://figshare.com/articles/journal_contribution/Photoelectrochemical_Sensor_for_H_sub_2_sub_S_Based_on_a_Lead-Free_Perovskite_Metal_Organic_Framework_Composite/25327250Test -
9دورية أكاديمية
المؤلفون: Yongjun Peng, Jialiang Lin, Ji-Liang Niu, Xiaolan Guo, Yazhen Chen, Tongke Hu, Jianhua Cheng, Yongyou Hu
مصطلحات موضوعية: Biophysics, Biochemistry, Microbiology, Biotechnology, Plant Biology, Space Science, Chemical Sciences not elsewhere classified, tandem mass spectrometry, step solvothermal reaction, major active sites, electron conduction mechanism, density functional theory, possible degradation products, adsorbed cip directly, 2 , novel bi ion, 1 , ion doping techniques, bi )- nh, ii heterojunction construction, )- nh, ii heterojunction, 1 %), ii heterojunctions, ion doping, bi ions, viable tactics, synergistic effect, study provides, situ growth
الوصف: Heterojunction structure and ion doping techniques are viable tactics in facilitating the generation and separation of photogenerated electrons and holes in photocatalysis. In the current study, a novel Bi ion-doped MIL-68(In,Bi)-NH 2 @BiOBr (MIBN@BOB) type-II heterojunction was first synthesized in a one-step solvothermal reaction. Doping of Bi ions not only broadened the light-sensing range but also provided reliable anchor sites for the in situ growth of BiOBr. Meanwhile, the heterostructure supplied new channels for photogenerated carriers, accelerating the transfer and inhibiting the recombination of photogenerated electron–hole. The obtained MIBN@BOB exhibited enhanced photocatalytic performance (91.1%) than MIL-68(In)-NH 2 (40.8%) and BiOBr (57.5%) in ciprofloxacin (CIP) degradation under visible light, with excellent reusability. Photocatalysts were characterized in detail, and a series of photoelectrochemical tests were utilized to analyze the photoelectric properties. MIBN@BOB were deduced to conform the electron conduction mechanism of conventional type-II heterojunctions. More importantly, based on the above experiments and density functional theory (DFT) calculation, BiOBr-Bi in MIBN@BOB can serve as the major active sites of CIP enrichment, and •O 2 – and 1 O 2 generated at the BiOBr interface can react with the adsorbed CIP directly. Lastly, the possible degradation products and pathways of CIP were analyzed by liquid chromatography-tandem mass spectrometry (LC/MS/MS). This study provides a reference for the construction of ion-doping-modified metal–organic framework (MOF)-based heterojunction photocatalysts and their application in antibiotic removal.
الإتاحة: https://doi.org/10.1021/acsami.3c16037.s001Test
https://figshare.com/articles/journal_contribution/Synergistic_Effect_of_Ion_Doping_and_Type-II_Heterojunction_Construction_and_Ciprofloxacin_Degradation_by_MIL-68_In_Bi_-NH_sub_2_sub_BiOBr_under_Visible_Light/24943702Test -
10دورية أكاديمية
المؤلفون: Tajamul Shafi, Chinmayee Das, Brajesh Kumar Dubey, Shamik Chowdhury
مصطلحات موضوعية: Biotechnology, Ecology, Developmental Biology, Space Science, Chemical Sciences not elsewhere classified, undemanding recuperation persists, spontaneous renewable energy, sparked immense interest, pyridinic n species, light harnessing capacity, interconnected conductive networks, exceptional mechanical resilience, excellent recycling stability, eliminate psychoactive substances, exceptional photocatalytic properties, “ wnga ”), remarkable solar absorption, driven heterogeneous photocatalysis, 2 , wnga shows self, photocatalytic degradation, widespread exploitation, water treatment, visible range, supporting photocatalyst, situ growth, significant hurdle, potentially nontoxic, pond water, past decade
الوصف: As a spontaneous renewable energy-based technology, with an astonishing ability to destroy recalcitrant organic pollutants under ambient conditions, solar-driven heterogeneous photocatalysis has sparked immense interest over the past decade. However, creating photocatalysts with astounding visible-light harnessing capacity and undemanding recuperation persists as a significant hurdle to the widespread exploitation of photocatalysis in water treatment. Herein, we propose a potentially nontoxic, robust, durable, and self-supporting photocatalyst, based on the in situ growth of few-layer (FL) WS 2 nanosheets on the interpenetrating channels of nitrogen (N)-doped graphene aerogel (henceforth denoted as “WNGA”). Constructed through a mild hydrothermal processing scheme, WNGA shows self-floating capability, exceptional mechanical resilience, and remarkable solar absorption in the visible range. In addition, the coexistence of pyridinic N species and FL-WS 2 clusters synergistically provides surplus active sites for catalytic reactions. Besides, the interconnected conductive networks of WNGA coherently upregulate charge separation and transfer in 3D. As a result of these beneficial attributes, WNGA presents prominent photocatalytic activity and excellent recycling stability. For instance, through a combination of adsorption and partial oxidation, WNGA can dissociate up to 93% caffeine, the most widely consumed psychoactive substance, into innocuous products over multiple cycles. As a figure-of-merit for the commercial potential of WNGA, we also demonstrate the photocatalytic degradation of caffeine in four different real matrixes, viz., tap water, pond water, municipal wastewater, and hospital wastewater. The exceptional photocatalytic properties, improved durability, and facile retrieval opportunities validate the application potential of WNGA to eliminate psychoactive substances in aqueous environments.
الإتاحة: https://doi.org/10.1021/acsanm.3c04839.s001Test
https://figshare.com/articles/journal_contribution/Aerogels_Made_of_Few-Layer_WS_sub_2_sub_Nanosheets_and_Nitrogen-Doped_Graphene_for_Photocatalytic_Degradation_of_Caffeine/24975257Test
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