Materials Today Chemistry
·
2024
·
IF 6.7
Tao Yang,Lingxiang Chu,Yi Qin,Qiang Zhou,Jing Wan,Huaijun Tang,Yanqing Ye,Zhengliang Wang
The quest for efficient and heat-resistant near-infrared (NIR) phosphors to create advanced smart NIR lighting sources continues to pose a significant challenge. This study introduces a new fluoride phosphor, Cr 3+ -doped Cs 2 NaScF 6 , wherein the Cs 2 NaScF 6 host provides a weak crystal field suitable for Cr 3+ doping. This arrangement allows the production of a broad NIR emission peaking at 797 nm, coupled with a notable internal quantum efficiency of 90.8 % when excited by 446 nm blue light. Meanwhile, due to the relatively mild electron-phonon coupling effect and a high activation energy within this phosphor, the overall NIR emission intensity at 150 °C sustains 81.8 % of its level at room temperature. This highlights exceptional thermal stability in photoluminescence performance. Combining the Cs 2 NaScF 6 :Cr 3+ phosphor with a commercially available blue InGaN chip to construct a NIR light-emitting diode (LED) device, which exhibits efficient and stable NIR emission, making it suitable for non-destructive testing applications. These findings affirm that the Cs 2 NaScF 6 :Cr 3+ phosphor can function as a promising candidate to fabricate high-performance device for NIR spectroscopy application.
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Polymer Chemistry
·
2024
·
IF 4.1
Hao Zheng,Zejun Zheng,Dirong Gong,Chun Tian,You Wen,Zhen Wang,Jingling Yan
The rapid development of high-speed communication networks has imposed more stringent requirements on the comprehensive performance of dielectric materials. In this work, a series of fluorinated poly(aryl ether)s (FPAEs) were prepared from 4,4′-dihydroxy-2,2′-bis(trifluoromethyl)biphenyl (TFBP) and different difluoride monomers through nucleophilic substitution reactions. The FPAE films had good thermal stability, with 5% weight loss temperature (Td5) values of 514–555 °C in nitrogen and glass transition temperature (Tg) values of 178–226 °C. Furthermore, these polymer films showed excellent hydrophobicity, with water contact angles ranging from 92.4° to 98.7°, and water absorption of 0.28–0.87%. Consequently, the FPAE films showed low dielectric constants of 2.07–2.80 and low dielectric loss of 0.002–0.006 at 11 GHz and 30 °C. These outstanding properties were attributed to their high fluorine contents and twisted biphenyl structures in the polymer chains.
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Small
·
2024
·
IF 13
Xiaowen Wang,Hong Zhang,Ping-Ping He,Xiaoxue Du,Yuxin Shen,Wensheng Cai,Weiwei Guo
With sequence-programmable biological functions and excellent biocompatibility, synthetic functional DNA holds great promise for various biological applications. However, it remains a challenge to simultaneously retain their biological functions while protecting these fragile oligonucleotides from the degradation by nucleases abundant in biological circumstances. Herein, a smart delivery system for functional DNA payloads is developed based on proton-mediated dynamic nestling of cytosine-rich DNA moieties within the precisely size-matched nanochannels of highly crystalline metal–organic frameworks (MOFs): At neutral pH, cytosine-rich DNA strands exhibit a flexible single-stranded state and can be accommodated by MOFs nanochannels with a size of ca. 2.0 nm; while at acidic conditions, the protonation of cytosine-rich strands weakens their interaction with the nanochannels, and the tendency to form four-stranded structures drives these DNA strands out of the nanochannels. Results confirm the successful protection of DNA payloads from enzymatic hydrolysis by the MOFs nanochannels, and the delicate coupling of the endocytosis processes and the proton-responsive Cytosine-rich DNA/MOFs systems realized the efficient intracellular delivery of DNA payloads. Furthermore, with a complementary sequence to the telomere overhangs, direct imaging of telomeres and the nucleus is successfully achieved with the proton-mediated DNA/MOFs system.
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Energy & Environmental Materials
·
2025
·
IF 14.1
Wenjian Wang,Changyi Zheng,Shengjie Zhang,Yao Liu,Linjuan Zhang,Jianqiang Wang,Yonggang Wang
Micro-sized silicon (mSi) anodes offer high capacity for next-generation lithium-ion batteries but suffer from severe volume changes, causing unstable interphases and poor cycling. Traditional electrolytes derive unstable electrolyte/electrolyte interphases, and flammable solvents pose safety risks. Here, we introduce a non-flammable molten salt electrolyte, which consists of lithium bis(fluorosulfonyl)imide, potassium bis(fluorosulfonyl)amide, and cesium bis(fluorosulfonyl)imide in a mole ratio of 0.3:0.35:0.35 (noted as Li 0.3 K 0.35 Cs 0.35 FSA), that forms an inorganic interphase on mSi, stabilizing the electrode/electrolyte interface. Computational and experimental insights elucidate the FSA − anion decomposition-derived SEI predominantly of LiF, Li 3 N, Li 2 O, and Li 2 S, which exhibits mechanical resilience and low interfacial resistance, effectively accommodating the significant volume expansion of silicon during lithiation/delithiation. As a result, the Li||mSi half-cell achieves 60.7% capacity retention after 100 cycles with 99.5% average Coulombic efficiency. Overall, the Li 0.3 K 0.35 Cs 0.35 FSA electrolyte eliminates flammability concerns while enabling robust cycling performance. This work demonstrates a safe, high-energy battery system by coupling mSi anodes with stable molten salt electrolytes, addressing both interfacial instability and safety challenges in mSi-based lithium-ion batteries.
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Optics
·
2025
·Vol. 7
·期 1
·1
·
IF 1.6
Chenxing Liao,Huihuang Cai,Jiabao Wu,Wei Xie,Liaolin Zhang
Mn4+-activated fluoride phosphors possess outstanding luminescent properties, making them highly suitable for applications in lighting and display technologies. However, the synthesis of such phosphors generally requires the use of large amounts of highly toxic aqueous HF, leading to serious environmental pollution. To eliminate the use of hazardous HF solution, a low-temperature molten salt method employing NH4HF2was developed to synthesize the narrow-band red emitter Cs2GeF6: Mn4+phosphor. Following the reaction, the product was washed with a dilute H2O2solution to remove residual NH4HF2and other impurities. The phase purity and morphology were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively, and the luminescence properties were examined via photoluminescence (PL) spectroscopy. The obtained phosphors exhibit bright red emission characteristics of Mn4+under blue-violet excitation. Among them, Cs2GeF6: 0.08 Mn4+shows the highest emission intensity, with an internal quantum efficiency (IQE) of 78%. A white light-emitting diode (WLED) fabricated by combining this phosphor with a blue chip and commercial Y3Al5O12: Ce3+(YAG) phosphor achieved a high luminous efficacy (LE) of ~146 lm/W, a correlated color temperature (CCT) of ~4396 K, and a color rendering index (Ra) of ~83, alongside excellent operational color stability.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2015
·Vol. 21
·期 27
·9809-9815
·
IF 5.731
Shang-Xiong Huang-Fu ,Jin-Ni Shen ,Hua Lin,Ling Chen,Li-Ming Wu
Graphical 72-Atom supercubooctahedron : A novel type of supertetrahedral connectivity is exhibited by the 72-atom discrete supercubooctahedron in (Cs 6 Cl) 2 Cs 5 [Ga 15 Ge 9 Se 48 ] (see figure), which undergoes both cation and anion exchange. Electronic-structure studies help to understand the Ge/Ga distribution, and the band structure is studied theoretically. A novel type of supertetrahedral connectivity is exhibited by the 72-atom discrete supercubooctahedron in (Cs 6 Cl) 2 Cs 5 [Ga 15 Ge 9 Se 48 ] ( 1 ), which undergoes both cation and anion exchange, as revealed by unambiguous single-crystal X-ray diffraction data. Electronic-structure studies helped to understand the Ge/Ga distribution.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Hao Deng,Wanjie Xu,Xinle Li,Pengfei Liu,Ding Tang,Sen Huang
The extremely high theoretical capacity of lithium metal anode positions it as an ideal candidate for next-generation high-energy-density energy storage systems. However, its practical application is hindered by uncontrollable lithium dendrite growth and the instability of the solid electrolyte interphase (SEI) layer. This study proposes an electrolyte modification strategy based on the synergetic effect of Cs + and F – , employing low-concentration CsF additives to simultaneously achieve uniform lithium deposition and optimized the composition of SEI. The results reveal that Cs + preferentially adsorbs at the tip regions of the lithium metal surface via an electrostatic shielding mechanism, forcing Li + to nucleate uniformly on flat regions, thereby effectively suppressing dendrite formation. Meanwhile, F – promotes the formation of LiF within the SEI layer, significantly enhancing interfacial stability. Electrochemical tests revealed that the addition of 0.05 M CsF enhanced the average Coulombic efficiency of Li||Cu cells from 58.9% to 70.9% after 100 cycles at 0.5 mA/cm 2 , while significantly extending the cycling lifespan of Li||Li symmetric cells from 100 h to over 250 h under 1 mA/cm 2 current density. In NCM622||Li cells, the capacity retention after 100 cycles at 1C improves from 38.6% to 80.6%. X-ray photoelectron spectroscopy and scanning electron microscopy characterization confirm that the LiF-enriched SEI layer induced by CsF effectively reduces interfacial impedance and inhibits dead lithium accumulation. This work provides innovative insights into developing high-performance lithium metal batteries through cation-anion synergetic regulation of electrolyte interfaces.
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Food Bioscience
·
2025
·
IF 5.9
Lu Zeng,Huan Lv,Xiangrui Li,Wenjia Yang,Wencan Luo,Linghong Kong,Qiujin Zhu
Cyclosulfamuron (CS) is a widely used sulfonylurea herbicide in plant cultivation and food production, and poses significant threats to ecological balance and food safety. To address this concern, we designed a novel CS hapten using computer-simulated semi-antigens. A monoclonal antibody (mAb) exhibiting high specificity and affinity was generated, with an affinity constant of 1.049×10 9 L/mol and a semi-inhibitory concentration (IC 50 ) of 4.94 ng/mL. Leveraging this anti-CS mAb, we constructed a rapid, visually detectable, quantitative lateral flow immunoassay (LFIA) to detect CS in cereals. Under the optimal conditions, the cut-off values were determined to be 100 μg/kg for brown rice and corn samples and 50 μg/kg for rice samples. The corresponding limits of detection values (LODs) were found to be 1.93 μg/kg in brown rice, 2.18 μg/kg in corn and 1.93 μg/kg in rice, respectively. The recovery rates ranged from 96.2% to 104.8% with coefficients of variation ranging from 3.5% to 6.4%, showing good agreement with the results obtained by liquid chromatography–tandem mass spectrometry (LC–MS/MS). The proposed assay demonstrated robust analytical performance, with significant application potential for rapid, on-site detection.
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Journal of the American Chemical Society
·
2025
·
IF 15.6
Meng Lei,Decheng Li,Keyi Chen,Zhe Han,Guyue Li,Xianhui Nie,Jingxian Zhang,Chilin Li
Due to the ultrahigh theoretical energy density, no dendrite issue, and abundant resources, fluoride ion batteries (FIBs) have received a lot of attention. Regarding the issue of dissolving inorganic salt CsF in aprotic organic solvents, some anion acceptor (AA) strategies have been proposed. However, the strong binding force greatly constrains F– ion desolvation, resulting in short lifespan, low specific capacity, and poor reversibility of FIBs. Herein, we propose a concept of steric hindrance-driven closed-loop acceptor to address these problems, by using tetraphenylphosphonium chloride (Ph4PCl) with appropriate Lewis acidity to dissolve CsF and prepare a dynamic fluoride ion electrolyte based on the F–Cl exchange reaction, with a high ionic conductivity of 4.1 mS/cm at room temperature. The steric hindrance effects of chlorine and phenyl can accelerate the desolvation kinetics of F– ions. The excellent kinetics of the Ph4PCl-based electrolyte endows FIBs with long-term cycling stability, and the Sn@SnF2 symmetric cells can cycle for 500 h at 100 μA/cm2 and tolerate a critical current density as high as 1250 μA/cm2. Due to the potential dissociation ability of five-coordinated acceptor central phosphorus for fluorides and the closed-loop conversion effect of chlorine, the fluorination and defluorination reaction proceeds in a dissolution-deposition mode. The CuF2//Sn@SnF2 cell (under a high cathode loading of 4.2 mg/cm2) exhibits the highest reversible capacity up to 717.7 mAh/g and remains 316 mAh/g after 65 cycles with a small voltage polarization of only 11 mV. This work points out the novel design concept of AAs for developing high capacity and long lifespan FIBs.
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CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Huan Pei,Luyong Zhang,Huanhuan Cheng,Shibin Wang,Zhihua Yang,Fangfang Zhang,Shilie Pan
Four hydroxyfluorooxoborates, α-K2[B3O3F4(OH)] (I), β-K2[B3O3F4(OH)] (II), Cs(NH4)3[B3O3F4(OH)]2 (III), and RbCs5[B3O3F4(OH)]3 (IV), with identical fundamental building block (FBB) [B3O3F4(OH)]2–, were obtained successfully and characterized comprehensively. A phase transition between I and II was detected, which led to a space group evolution from centrosymmetric to noncentrosymmetric. The F– and OH– substitution effect was studied based on II and its hydroxyborate derivative K2[B3O3(OH)5], which reveals the corresponding changes in the band gap and the nonlinear optical properties. In addition, the cationic-size effect on the arrangement of the [B3O3F4(OH)]2– FBBs and the birefringent properties were discussed for the title compounds. This study contributes to the advancement of structural chemistry and sheds some light on the structure–property relationship studies of hydroxyfluorooxoborates.
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EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Hong Li,Xiaoqian Lan,Feng Bao,Shuanger Li,Haoran Zhu,Zijuan Zhu,Yadong Li,Mingliang Wang,Caizhen Zhu,Jian Xu
Polyimide (PI), as an ideal interlayer dielectric material, is widely used in traditional communication fields. However, with the rapid development of 5G communication, conventional polyimide exhibits disadvantages such as signal delay and missing and is in urgent need of modification. Based on the β-relaxation theory, we designed and prepared three types of triphenylenediamine-containing monomers with different side group sizes (A-AmM, A-AmP, and A-AmBP) and polymerized them with benzene tetracarboxylic dianhydride (PMDA) to obtain three types of polyimides (MPI, PPI, BPPI), to investigate the effect of the relaxation behavior on the dielectric constant (D k ) of the polyimide. It was also polymerized with 4,4′-(hexafluoroisopropyl)diphthalic anhydride (6FDA) to three fluorinated Polyimides (MFPI, PFPI, BFPPI) to investigate the effect of polar groups on D k and the dielectric loss (D f ). In addition, we also calculate the free volume of polyimide molecules under different side groups by materials studio simulation to further verify the effect of side groups on the D k . The results show that, firstly, with the increase of side group volume, polyimide still maintains excellent thermal stability, and its dielectric constant gradually decreases and mechanical strength gradually increases. Secondly, the dielectric constant of FPIs is significantly lower than that of the PIs due to the low polar group, and the thermal and mechanical properties are almost unchanged. In addition, benefiting from the combined effects of β-relaxation and trifluoromethyl groups, BPFPI exhibits a low D k (2.64@10 GHz) and D f (0.0092@10 GHz), excellent thermal properties (glass transition temperature (T g ) = 282.3 °C, 5 % decomposition temperature (T d5% ) = 537 °C) and excellent mechanical properties (tensile modulus = 1.71 GPa, tensile strength = 134.7 MPa).
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Decheng Li,Guyue Li,Yifan Yu,Chilin Li
Fluoride ion batteries (FIBs) have garnered significant attention due to their ultrahigh theoretical energy density, dendrite-free safety, and resource abundance. Although some anion acceptors have been proposed to address the insolubility of inorganic fluoride salts, the difficulty in dissociating fluoride ions from acceptors results in short lifespan and extremely low specific capacity of FIBs. Here, a fluoride ion battery is demonstrated with unprecedented long life and ultrahigh specific capacity through the design of an acceptor-multi-F state electrolyte. The high Lewis acidity of triphenylantimony chloride (TSbCl) as a novel anion acceptor in electrolyte facilitates the complete dissociation of CsF, and the resulting TSbCl-F complex can further interact with fluoride ions to form the acceptor-multi-F states. This strategy combines the high dissociation capability for fluoride salts with the minimal thermodynamic barriers for releasing fluoride ions at electrode-electrolyte interface. This electrolyte design endows FIBs with durable reversible fluorination/defluorination reaction (3700 cycles with high coulombic efficiency of 99.5% and small voltage polarization of 30 mV) and ultrahigh reversible capacity (580 mAh g −1 after 40 cycles at 100 mA g −1 ). The high-output voltage FIBs of CuF 2 //Li configuration (with discharge plateau of 2.9 V) and larger-sized pouch-type FIBs of CuF 2 //Sn+SnF 2 configuration (with reversible capacity of 530 mAh g −1 ) are demonstrated.
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