Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Chen Donglin,Sha Juncheng,Mei Xudong,Ye An,Zhao Zhengping,Qiu Xunlin,Liu Xiaoyun,Niu Yueping,Zuo Peiyuan,Zhuang Qixin
As integrated circuits have developed towards the direction of complexity and miniaturization, there is an urgent need for low dielectric constant materials to effectively realize high-fidelity signal transmission. However, there remains a challenge to achieve ultralow dielectric constant and ultralow dielectric loss over a wide temperature range, not to mention having excellent thermal conductivity and processability concurrently. We herein prepare dual-linker freestanding covalent organic framework films with tailorable fluorine content via interfacial polymerization. The covalent organic framework possesses an ultralow dielectric constant (1.25 at 1 kHz, ≈1.2 at 6 G band), ultralow dielectric loss (0.0015 at 1 kHz) with a thermal conductivity of 0.48 Wm −1 K −1 . We show high-fidelity signal transmission based on the large-sized (>15 cm 2 ) COF films, far exceeding the most commercially available polyimide-based printed circuit board. In addition, the covalent organic framework also features excellent electret properties, which allows for active high-temperature electromechanical sensing. The electrode nanogenerator maintains 90% of the output voltage at 120 °C, outperforming the traditional fluorinated ethylene propylene electret. Collectively, this work paves the way for scalable application of ultralow dielectric constant covalent organic framework thin films in signal transmission and electromechanical sensing.
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Chemistry-Switzerland
·
2025
·Vol. 7
·期 5
·150
·
IF 2.4
Ting Geng,Yuhan Qin,Zhuo Chen,Yuhan Sun,Ao Zhang,Mengyuan Lu,Mengzhen Lu,Siying Zhou,Yongguang Li,Guanjun Xiao
Lead-free perovskite variants have emerged as promising candidates due to their self-trapped exciton emission. However, in ASnX3systems, facile oxidation of Sn(II) to Sn(IV) yields A2SnCl6vacancy-ordered derivatives. Paradoxically, despite possessing a direct bandgap, these variants exhibit diminished photoluminescence (PL). Doping engineering thus becomes essential for precise optical tailoring of A2SnX6materials. Herein, through integrated first-principles calculations and spectroscopic analysis, we elucidate the luminescence mechanism in Te4+-doped (NH4)2SnCl6lead-free perovskites. Density functional theory, X-ray diffraction (XRD) patterns and X-ray photoelectron spectroscopy (XPS) confirm Te4+substitution at Sn sites via favorable chemical potentials. Spectral interrogations, including absorption and emission profiles, reveal that the intense emission originates from the triplet STE recombination (3P1→1S0) of Te centers. Temperature-dependent PL spectra further demonstrate strong electron–phonon coupling that induces symmetry-breaking distortions to stabilize STEs. Complementary electronic band structure and molecular orbital calculations unveil the underlying photophysical pathway. Leveraging these distinct thermal responses of PL intensity and peak position, 0.5%Te:(NH4)2SnCl6emerges as a highly promising candidate for non-contact, dual-parameter optical thermometry over an ultra-broad range (100–400 K). This work provides fundamental insights into the exciton dynamics and thermal engineering of optical properties in this material system, establishing its significant potential for advanced temperature-sensing applications.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jianghua Wu,Faisal Faiz,Mashkoor Ahmad,Miao Zhengjie,Zha Qiang,Wei Xu,Xiaojin Zhao,Xiaofang Pan,Yasir Faiz
The fabrication of supercapacitors with outstanding performance is presented with a distinct defect-rich nanostructures. A one-pot, energy-efficient method for synthesizing defective manganese dioxide nanowires doped with potassium (K 0.35 MnO 2 ) was developed. The introduction of potassium ions at 35 % birnessite resulted in a significant increase in lattice defects and an improvement in conductivity. Addition of KOH induces a phase transition from α-MnO 2 to δ-MnO 2 . These imperfections result in a greater quantity of active sites, which are crucial for the process of energy storage. The K 0.35 MnO 2 structure demonstrates a 405F/g increased capacity at a current density of 1 A/g. The asymmetric supercapacitor (K 0.35 MnO 2 /AC) that was manufactured exhibits a capacitance of 106.4F/g when operating at 1 A/g, while maintaining a maximum energy density of 71.5 Wh kg −1 and a power density of 672 W kg −1 . Furthermore, 92.7 % of the initial capacitance of the device is retained even after 8,000 cycles at 20 A/g. This study presents novel insights into the production of defective materials for energy storage applications through the utilization of a one-pot process as opposed to the multi-step method. In order to produce high-performance supercapacitors for practical applications, the results indicate that defect engineering is a crucial factor.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 14
·14382-14392
·
IF 2.914
Yang Zhenyu,Xing Rong,Zhou Wenjun
Biochar are widely used as adsorbents/amendments for immobilizing pollutants in contaminated soils. In this study, the effects of dissolved organic matter derived from chicken manure (CMDOM) on the adsorption of ciprofloxacin (CIP) and Cu 2+ onto biochars were investigated. The FTIR spectra indicated that π-π donor-acceptor interactions between the hydroxyl groups on the biochar surface and the fluorine group connected to the benzene ring of CIP molecule was the main adsorption mechanism for CIP. CMDOM molecules interacted with the aromatic components in biochars and thus modified the surface chemical properties of biochar. The effect of CMDOM on the adsorption of CIP onto biochars showed great dependence on the distribution of solid adsorbed CMDOM and CMDOM in aqueous solutions. The solid adsorbed CMDOM facilitated CIP adsorption owing to increase the content of –OH on biochar surface, which could provide more π-electron donors and thus strengthened π-π EDA interactions between CIP and biochars. The EDS spectra showed that the ion exchange with K + was the main adsorption mechanism for Cu 2+ onto biochars, and the presence of CMDOM enhanced complexation of Cu 2+ with adsorbed CMDOM, thus increasing Cu 2+ adsorption onto biochars. These results are useful for the application of biochars to immobilize antibiotic and heavy metals in contaminated farmland soils when animal manure fertilizers is presented in soil environment.
研究领域:
环境科学
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土壤化学
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污染控制
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 21
·215202
·
IF 3.874
Guandong Wang,Daiming Liu,Shuangqing Fan,Zhaoyang Li,Jie Su
In this work, high-dielectric-constant (high-k) erbium oxide（Er2O3）film is fabricated using the spin coating method, and annealed at a series of temperatures (from 400 °C to 700 °C). The effect of annealing temperature on the microstructural and electrical properties of Er2O3 nanofilm is investigated. To demonstrate the applicability of the Er2O3 film, the indium oxide (In2O3) thin film transistor (TFT)-based amorphous Er2O3 dielectric film is fabricated at different temperatures. The TFT-based EO-600 shows a low-operating voltage and good electrical properties. The inverter demonstrates that the Er2O3 nanofilm synthesized by the sol-gel method could be a promising candidate as the dielectric layer in a low-voltage electronic device.
研究领域:
材料科学
·
电子工程
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Liangmin Xiong,Shuang Liu,Yong Men,Lin Li,Xiaoda Niu,Kailiang Guo,Junzhe Xu,Wei An,Jinguo Wang,Yu Cong
CO 2 hydrogenation to liquid fuels is significant to reduce CO 2 emissions and replace fossil fuels . Herein, we reported that Fe catalysts promoted by combination of K and Pd showed a three-synergistic catalytic effect to high selectivity of C 5+ hydrocarbons in CO 2 hydrogenation reaction. The catalysts were prepared using an impregnation method and characterized with physical adsorption , XRD , XPS , HRTEM , H 2 -TPR, H 2 -TPD and CO 2 -TPD. The results indicated that K 0.016 Pd 0.12 Fe catalysts showed K-overlapped PdFe-like alloy structure which enhanced H 2 activation behaviors and moderately chemisorption of CO 2 . K addition promoted Fe to activate carbide species while active H originated from H 2 pool generated by PdFe alloy spilled to Fe species surface, consequently boosting not only conversion of CO 2 to 41.8% but also selectivity of C 5+ hydrocarbon to 70.6%. The maximum yield of long-chain C 5+ hydrocarbon reached up to 20.0% under high space velocity 6000 mL g cat −1 h −1 . These results provide a new insight to develop highly selective Fe based catalysts for long-chain hydrocarbons via CO 2 hydrogenation.
研究领域:
化学工程
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催化反应
·
能源转化
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·
IF 2.4
Jia Xu,Xun Wang,Jiazheng Qin,Ziwei Hu,Ruyi Lin,Yong Ma,Dan Li,Lingzong Meng
The solid–liquid phase equilibria of the quaternary system Na+, Cs+//Cl–, CO32––H2O and its subsystem Na2CO3–Cs2CO3–H2O at 308.15 K were studied by the isothermal dissolution method. The phase diagram of the system Na2CO3–Cs2CO3–H2O is composed of two single-salt crystallization fields of Na2CO3·H2O and Cs2CO3·H2O, two solubility univariant curves, and one invariant point. The dry-salt phase diagram of the quaternary system consists of three invariant points, seven univariant curves, and five crystallization regions corresponding to Na2CO3·H2O, NaCl, solid solution [Cs1–x(Na·H2O)x]Cl, Cs2CO3·H2O, and double salt CsCl·2NaCl·2H2O. The areas of crystallization zones decrease according to the above order. The Jan̈ecke index of H2O, pH, and refractive index of the liquid phase in the quaternary system change regularly with the Jan̈ecke index of Cs+. These results on the phase diagram of the quaternary system can supply theoretical references for cesium salt separation from carbonate-type brine.
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INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE
·
2026
·Vol. 57
·期 4
·1-13
·
IF 8.5
Peng-Yao Lin,Jia-Rong Xie,Tian-Chen Qian,Shi-Song Wang,Si-Yi Yu,Wen-Bo Shi,Ying Wang,Lu-Ze Cen,Qing-Jing Zhu,Yi-Yang Zheng,Hui Gao,Rong Fang,Zhao-Xia Xia,Ai-Ming Liu,Lei Xu
International Journal of Molecular Medicine is an international journal devoted to molecular mechanisms of human disease.
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ACS Catalysis
·
2026
·
IF 13.1
Wendong Wang,Xingwen Cha,Longmei Shang,Kang Sun,Fangsong Guo,Jianchun Jiang,Guowu Zhan
This work demonstrates a strategic shift from dynamic electrolyte modulation to static, intrinsic promotion of the CO2 reduction reaction by stably integrating alkali metal cations as a solid-state component within a heterogeneous catalyst. To address the persistent challenge of alkali metal ion leaching due to high aqueous solubility, we immobilize K+ cations into a carbon nitride framework (Ni@K–C3N4) hosting atomically dispersed Ni–N3 sites via an ionothermal strategy. Structural confinement through coordination with nitrogen sites in the C3N4 matrix effectively suppresses K+ leaching, enabling sustained electronic regulation of the Ni centers. Combined experimental and theoretical analyses reveal that K+ incorporation attenuates d-π conjugation, promotes electron localization around Ni sites, and stabilizes low-valent Niδ+ species. This electronic reconfiguration enhances CO2 adsorption and activation while suppressing competitive hydrogen evolution reaction. The optimized Ni@K–C3N4 catalyst achieves a CO Faradaic efficiency of 95% at −0.74 V vs RHE, a current density of ∼20 mA·cm–2, and stable operation over 50 h. Notably, it maintains >80% CO selectivity under a diluted CO2 atmosphere (40%), highlighting its practicality for real low-concentration streams. This work establishes a polymer-functionalization strategy for precise electronic tuning of single-atom catalysis, advancing the design of efficient CO2 utilization systems.
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ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Riyang Shu,Haozhe Huang,Bin Hu,Long Xie,Xintong Chen,Zhipeng Tian,Chao Wang,Jingtao Zhang,Sheng Yang,Xianglong Luo,Ying Chen
Methanol steam reforming is a popular technology for hydrogen production, but it usually suffers from the methanation side reaction and low hydrogen yield. Herein, a novel K-doped Ru/CeO2 catalyst was proposed to suppress methanation and enhance hydrogen production. The Ru-5K/CeO2 catalyst doped with 5 wt % K achieves 100% methanol conversion, a 0.578 mol·g–1·h–1 hydrogen production rate, and 66.4% hydrogen selectivity at 450 °C, with only 3.6% CH4, which is much better than other Ru–K/CeO2 catalysts. Under the same conditions, Ru/CeO2 and Ru-10K/CeO2 only achieve 0.268 mol·g–1·h–1 and 0.224 mol·g–1·h–1 hydrogen production rates, 64.1% and 64.5% hydrogen selectivity, respectively. The promotion effect and mechanism of K doping on the methanation suppression of Ru/CeO2 catalysts in the methanol steam reforming process were investigated in detail. Characterization and experimental results show that suitable K doping in the Ru/CeO2 catalyst enhances the metal–carrier interactions and induces the formation of abundant oxygen vacancies at the same time. And the hydrogen atom dissociation and water–gas shift reactions on the catalyst surface are promoted significantly. Additionally, in situ DRIFTS characterization presents that the Ru-5K/CeO2 catalyst dominates the formation of the bridged carbonyl (Ru-CO-K) intermediate. This inhibits methane formation due to the interaction between Ru and K, and strengthens the connection of CO generated by methanol decomposition. The increase in K leads to the formation of abundant oxygen vacancies in CeO2, which promotes the dissociation of water to form hydroxyl groups and hydrogen and facilitates the water–gas shift reaction. The conversion of bridged carbonyl groups to CO2 and H2 is also accelerated, and methane formation through this dual regulatory mechanism is thus inhibited. This work offers fresh perspectives and a useful reference for hydrogen production, contributing to the ongoing discussion on the role of alkali metals in promoting methanol steam reforming.
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APPLIED CATALYSIS A-GENERAL
·
2026
·
IF 4.8
Jue Wang,Huitao Liu,Siyu Zeng,Jinyi Yang,Zaihui Fu,Youji Li,Senpei Tang,Anqun Su
Merely 1.2 wt% KCCN elevates cyclohexane conversion to 64.47%, 2.5-fold that of pure QA-DT. • QA-DT performs HAT cleavage, while KCCN activate O 2 , enabling an efficient catalytic cycle. • The system achieves high ketone/alcohol selectivity (K/A ratio ∼5) and total selectivity > 95%. • The nanosheet-cluster interface boosts visible light absorption and stabilizes the catalyst. The selective oxidation of cyclohexane to KA oil holds significant importance in both fundamental research and industrial applications, with the formation of cyclohexyl hydroperoxide serving as a crucial rate-determining step. In this study, a hybrid material designated as QA-DT@KCCN was constructed through the in-situ composition of potassium/cyano-comodified carbon nitride nanosheets (KCCN) and quaternary ammonium-decatungstate (QA-DT), aiming to enhance the mass transfer efficiency of O 2 and improve the utilization efficiency of hydrogen atom transfer products. The results demonstrate that a minimal KCCN doping of 1.2 wt% significantly enhanced the photocatalytic oxidation performance. Under light irradiation in acetonitrile for 2 h, a cyclohexane conversion rate of 64.47% was achieved (compared to 25.18% with pure QA-DT), with a ketone/alcohol ratio of 5.02 and overall selectivity exceeding 95%. Radical quenching and trapping experiments confirmed that superoxide anion radicals (•O 2 - ) and holes (h + ) are the key active species in this photocatalytic system. The unique nanosheet-cluster interfacial coupling effect in the hybrid material not only facilitates directional electron transfer but also enhances visible light absorption and stabilizes the ionic structure of decatungstate. This study provides a novel strategy for designing high-efficiency decatungstate catalysts, offering valuable insights to advance the technology of selective inert hydrocarbon oxidation. Download: Download high-res image (208KB) Download: Download full-size image
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Shuo Xue,Binghan Li,Dehui Yu,Yingjie Zhao,Dengchao Wang
Aberrant fluctuations in the concentration of cytosolic Potassium ion (K⁺), crucial players in diverse physiological processes, are pathologically implicated in multiple disease states. The real-time monitoring of intracellular K⁺ dynamics thus represents a critical capability for biomedical research. Herein, by integrating Prussian blue (PB) inside the carbon nanopipette (CNP), we developed a nanosized K + -selective electrode that exhibits a broad detection range (10⁻⁵ to 10⁻¹ M) and a low detection limit of 3.38 μM. Moreover, the real-time monitoring of the K⁺ dynamics inside single living cells was also achieved owing to the fast response of the nanoelectrode. The fabricated PB-CNP would provide a novel research tool to monitor K⁺ at the confined spaces, which could find broad applications in the area of fundamental neurobiology, cellular physiology and electrochemistry.
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