POLYMER ENGINEERING AND SCIENCE
·
2024
·Vol. 64
·期 3
·1299-1311
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IF 3.2
Gang Ma,Xingzhong Fang,Guofei Chen
Aromatic nucleophilic substitution polymerization was used to synthesize five poly(ether nitrile imide)s (PENIs) that include benzonitrile and bulky cardo groups from a mixture of phenolphthalein (PP), 4,4′-bis(4-fluorophthalimide) diphenyl ether (4,4′-BFPI), and 2,6-difluorobenzonitrile (DFBN). The structure and properties relationship of PENIs with different ratios of DFBN and 4,4′-BFPI was explored. It was found that the glass transition temperature ( T g ) of PENIs decreased from 280 to 260°C, while the temperature of 5% thermal weight loss ( T 5% ) in N 2 increased from 429 to 453°C as the benzonitrile content in PENI increased. The produced PENI films had good mechanical characteristics, including tensile strengths of 103–112 MPa, elongations at break of 5.6%–8.2%, and tensile moduli of 2.9–3.4 GPa. Furthermore, the solubility and melt processability were also improved with the introduction of the benzonitrile group. Compared with poly(ether ketone imide)s (PEKIs) and poly(ether sulfone imide)s (PESIs), PENIs with benzonitrile displayed higher T g , tensile modules, and lower complex viscosity.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Jianwang He,Hu Meng,Xiaoxin Wang,Yan Xu,Liang Feng
Hexafluoroethane (CF 3 CF 3 ) is a significant greenhouse gas and a potential threat to the environment as emissions increase. However, there is no simple and effective method to detect CF 3 CF 3 yet. Hence, we first attempted to use metal oxide semiconductor (MOS) gas sensors for CF 3 CF 3 detection. Pristine SnO 2 and S-doped SnO 2 (1–3, representing different S contents) nanoparticles were synthesized. S elements successfully doped into the crystal structure of SnO 2 . The optimized sensor (S-SnO 2 -2) shows excellent CF 3 CF 3 sensing performance at 200 °C. The response value of the S-SnO 2 -2 sensor to 25 ppm CF 3 CF 3 at 200 °C is 13.44, which is significantly higher than the pristine SnO 2 response value of 4.45. The S-SnO 2 -2 sensor also exhibits a short response and recovery time (10 s and 148 s), reliable linear response, excellent selectivity, low limit of detection (0.5 ppm), satisfactory reparability, and good long-term stability. The sensing process of CF 3 CF 3 has been investigated by means of gas chromatography-mass spectrometry (GC-MS). The excellent sensing performance of CF 3 CF 3 in the S-SnO 2 -2 sensor can be attributed to the abundant active oxygen, excellent electron capture capability, and fast charge transfer of S-SnO 2 -2, which also benefits from its smaller grain size. This work is the first to report CF 3 CF 3 sensing using MOS gas sensors and has developed a feasible way for CF 3 CF 3 detection.
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Nanoscale
·
2024
·Vol. 16
·期 9
·4591-4599
·
IF 5.8
Ouyang Lin,Lijin Wang,Xiulin Xie,Shuaibing Wang,Yibo Feng,Jiawen Xiao,Yu Zhang,Aiwei Tang
Silver-based I–III–VI-type semiconductor nanocrystals have received extensive attention due to their narrow-band luminescence properties. Herein, we demonstrated a seed-mediated growth of quaternary Ag–In–Ga–S (AIGS) nanocrystals (NCs) with narrow-band luminescence. By conducting partial cation exchange with In3+ and Ga3+ based on Ag2S NCs and controlling the Ag/In feeding ratios (0.25 to 2) of Ag–In–S seeds as well as the inventory of 1-dodecanethiol, we achieved optimized luminescence performance in the synthesized AIGS NCs, characterized by a narrow full width at half maximum of less than 40 nm. Meanwhile, narrow-band luminescent AIGS NCs exhibit a tetragonal AgGaS2 crystal structure and a gradient alloy structure, rather than a core–shell structure. Most importantly, the kinetics decay curves of time-resolved photoluminescence and the ground state bleaching in transient absorption generally agree with each other regarding the lifetime of the second decay component, which indicates that the narrow-band luminescence is due to the slow radiative recombination between trapped electrons and trapped holes located at the edge of the conduction band and the deep silver-related trap states (e.g., silver vacancy), respectively. This study provides new insights into the correlation between the narrow-band luminescence properties and the structural characteristics of AIGS NCs.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaoyu Cao,Xiaomin Qiu,Fan Zhang,Meng Xiao,Tingting Huang,Quanhong Zhu,Zhijie Shang,Hongbing Song
The development of affordable, intelligent dual-separation technology is crucial for the treatment of oil–water mixtures. Pyridinium-based poly(ionic liquid)s (PILs), designed using molecular theory, exhibit unique switching wettability properties, making them ideal for use in both aqueous and oily environments. By prewetting the material’s surface with water or oil, the targeted separation of these components becomes feasible. PILs are synthesized through the cross-linking of [Pyr]Cl with various cross-linkers and auxiliary agents. Studies on the wetting mechanism of these materials have identified bursting pressure and surface structure as key factors influencing their wetting properties. They exhibit hydrophilic and lipophilic properties in air, hydrophobic properties under oil, and oleophobic properties under water, achieving a 99% separation efficiency. A reusability study demonstrated maintenance of 90% efficiency after 10 cycles, highlighting their sustained high performance. This research presents promising avenues for the application of PIL-based materials in oil–water separation, environmental remediation, and industrial processing.
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LUMINESCENCE
·
2025
·Vol. 40
·期 8
·e70271
·
IF 3
Zixuan Pu,Manjun Guan,Guilong Wang,Kuan Li,Mingtian Li
Nitrogen and sulfur co-doped yellow-green fluorescent carbon dots (N,SCDs) were synthesized using thiourea and 5-sulfo salicylic acid as raw materials through a one-step microwave solid-phase method. A series of characterizations, including transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR), UV–Vis spectrum, and fluorescent spectrum, were conducted, revealing that N,SCDs are carbon dots with an average size of approximately 5.65 nm. These dots were found to possess a surface rich in hydroxyl, amino, carbonyl, and sulfhydryl groups, along with excellent solid-state luminescent properties. N,SCDs were combined with starch to form N,SCDs-starch composite, which was successfully utilized for high-quality fingerprint development. Additionally, the solid-state N,SCDs were dissolved in DMSO to produce the liquid form, L-N,SCDs, which was effectively applied for the analysis and detection of Fe 3+ and OH − . The limits of detection (LODs) for Fe 3+ were determined to be 0.73 and 2.65 μM in the concentration ranges of 0–100 and 100–237.5 μM, respectively. Similarly, the LODs for OH − were found to be 0.027 and 0.66 μM in the ranges of 0–225and 225–525 μM, respectively. Furthermore, L-N,SCDs configured as fluorescent inks were demonstrated to exhibit significant potential in applications related to information anticounterfeiting.
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Jiangyu Wu,Jianghua Wu,Yuwen Xue,Yunwu Zheng,Jingyan Liu,Xu Lin,Fulin Yang,Yuan Zou,Can Liu
This study develops an environmentally friendly method to create S/P dual-doped porous carbon (WSC-SP-800) from walnut shells for supercapacitor electrodes. Compared with the raw carbon materials, WSC-SP-800 exhibits higher specific surface area, richer microporous and mesoporous structures, as well as superior electrochemical performance. The specific surface area rises from 1533.40 m 2 g −1 to 3061.96 m 2 g −1 , and the capacitance increases from 156 F g −1 to 417 F g −1 at a current density of 0.5 A g −1 . Additionally, WSC-SP-800 maintains a capacitance of 270 F g −1 even at a high current density of 10 A g −1 . When assembled into a symmetric supercapacitor, it achieves an energy density of 13.15 Wh kg −1 at a power density of 250 W kg −1 and retains 100 % of its capacity after 5000 cycles. This work not only achieves cost-effective, high-performance energy storage with environmentally benign characteristics but also establishes a novel paradigm for the valorization of biowaste through heteroatom engineering, providing a sustainable pathway for supercapacitor development.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Kunfeng Zhang,Jinxia Liang,Sainan Yang,Fangfei Song,Hongxia Chen,Baozhong Zhang,Bo Peng,Hanyu Chen,Hongxing Dai
Constructing an S-scheme heterojunction presents an effective strategy to enhance photocatalytic efficiency via accelerating photoexcited charge separation while preserving strong redox potentials. Herein, amorphous Ni(OH) 2 (a-NH) was in-situ integrated with crystalline Bi 12 O 17 Br 2 (BOB) nanosheets to form an amorphous/crystalline a-NH/BOB S-scheme heterojunction. The as-synthesized a-NH/BOB-0.5 photocatalyst exhibited superior bisphenol A (BPA) degradation efficiency, achieving 48.7 and 3.7-fold enhancements compared to individual a-NH and BOB, respectively. Comprehensive investigations revealed that the improved photocatalytic activity originated from the synergistic effects of enhanced light-harvesting ability and the formation of strong interfacial electric field at the amorphous/crystalline interface. Moreover, the influences of solution pH, coexisting anions, and water matrices on BPA degradation efficiency were also investigated. Reaction mechanism and toxicity assessment demonstrated that BPA could be gradually transformed into small molecules with low toxicity. This work demonstrates an efficient approach for the design of high-performance photocatalysts for environmental remediation by constructing amorphous/crystalline interface and S-scheme charge transfer mechanism.
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Journal of Energy Storage
·
2025
·
IF 9.8
Zhiru Yang,Zi Yang,Wentao Hou,Hai Zhou,Hao He,Chao Jin
This study modifies the structure of bimetallic cobalt‑nickel metal-organic framework (CoNi-MOF) via a sulfur doping strategy to form a composite material (CoNi-MOF-S) and investigates the mechanism for enhancing its electrochemical performance as a supercapacitor electrode. Compared with undoped CoNi-MOF, the introduction of sulfur plays a dual role: on one hand, sulfur replaces partial elements in organic ligands to form metal‑sulfur covalent bonds, which enhance electron transport efficiency; on the other hand, it successfully induces the formation of cobalt sulfate and nickel sulfate crystalline phases. These newly generated crystal phases construct a stable framework within the nanostructure, effectively alleviating the volume expansion problem during charge-discharge processes. The synergistic effect between the two endows the material with excellent charge-discharge performance and cycling stability. Experimental results show that CoNi-MOF-S2 exhibits superior specific capacitance (701C/g at 0.5 A g −1 ) and cycling stability (capacity retention >85 % after 5000 cycles at 5 A g −1 ) in 6 M KOH electrolyte. Furthermore, a flexible quasi-solid-state supercapacitor with a sandwich structure is constructed using CoNi-MOF-S2 as the positive electrode, activated carbon (AC) as the negative electrode, and a gel electrolyte. This device achieves an energy density of 53.4 Wh kg −1 at a power density of 379.4 W kg −1 , maintains 76.9 % capacity after 5000 cycles at 5 A g −1 , and can operate normally during bending. Demonstrating the synergistic mechanism of crystalline phase reconstruction and electronic structure optimization, this study offers new insights to enhance the performance of CoNi-MOF for electrode materials.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Yu Shi-Han,Wang Lu,Zhang Meng-Chao,Li Hong-Kun
Exploration of new green polymerization strategies for the construction of conjugated polymers is important but challengeable. In this work, a multicomponent polymerization of acetylarenes, alkynones and ammonium acetate for in situ construction of conjugated poly(triarylpyridine)s was developed. The polymerization reactions of diacetylarenes, aromatic dialkynones and NH 4 OAc were performed in dimethylsulfoxide (DMSO) under heating in the presence of potassium tert-butoxide ( t -BuOK), affording four conjugated poly(2,4,6-triarylpyridine)s (PTAPs) in satisfactory yields. The resulting PTAPs have good solubility in common organic solvents and high thermal stability with 5% weight loss temperatures reaching up to 460 °C. They are also electrochemically active. The PTAPs incorporating tetraphenylethene units manifest aggregation-induced emission features. Moreover, through simply being doped into poly(vinyl alcohol) (PVA) matrix, the polymer and model compound containing triphenylamine moieties exhibit room-temperature phosphorescence properties with ultralong lifetimes up to 696.2 ms and high quantum yields up to 28.7%. This work not only provides a facile green synthetic route for conjugated polymers but also offers new insights into the design of advanced materials with unique photophysical properties.
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ACS Nano
·
2022
·
IF 18.027
Lanxiang Feng,Peng Yu,Xuewei Fu,Zheng-Min Zhang,Kenneth Davey,Yu Wang,Zaiping Guo,Wei Yang
Polar host materials with strong adsorption capacity of polysulfides are designed to limit the shuttle effect in sulfur cathodes. However, a critical problem is to control diffusion and deposition of lithium polysulfides during cycling, which significantly impacts cycling stability and sulfur utilization. Here, we report using a sequential adsorption-guided self-assembly to design two types of core–shell sulfur particles with opposite polysulfide adsorption gradients to explore quantitatively the regulation of polysulfide diffusion and deposition. We show that a positive core–shell design of sulfur particles (PCSD@SP), i.e., polysulfide adsorption capability decreasing from the interior to the exterior of the host, is more effective in restricting polysulfide diffusion and regulating polysulfide deposition than the negative core–shell counterpart (NCSD@SP). As a result, the PCSD@SP electrode with a sulfur loading of 7 mg cm–2 exhibits a stable areal capacity of 6 mAh cm–2 over 130 cycles at 0.2C. At intermittent discharge/charge, the PCSD@SP electrode retains excellent stability compared with the NCSD@SP. We conclude that rational design of positive core–shell active materials can be used to regulate polysulfide diffusion and deposition to boost electrochemical reaction dynamics and performance. The reported findings will be of immediate benefit to a range of researchers in the design of high-performance lithium–sulfur batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yang Wan,Jiejing Liu,Huijie Wang,Xianghai Song,Weiqiang Zhou,Xin Liu,Jisheng Zhang,Yangyang Yang,Xiaojie Zhang,Binrong Li,Pengwei Huo
The inherent chemical stability of polyethylene terephthalate (PET) poses significant challenges for its natural degradation, leading to severe environmental accumulation. This study presents an innovative Co 1-x S/g-C 3 N 4 S-scheme heterojunction photocatalyst designed to enhance interfacial electron transfer and promote cobalt redox cycling for efficient peroxymonosulfate (PMS) activation, achieving effective PET degradation. Experimental results demonstrated that the optimized photocatalysis/PMS system achieved a 6.3-fold higher PET degradation efficiency compared to the photocatalysis system alone. The optimized system (30 % Co 1-x S/g-C 3 N 4 with 4 mM PMS and 1 mL H 2 O 2 under irradiation) achieved a remarkable PET degradation efficiency of 80.91 ± 1.30 %. Density functional theory (DFT) calculations unveiled the interfacial electronic structure of Co 1-x S/g-C 3 N 4 , demonstrating hole accumulation on g-C 3 N 4 and electron localization on Co 1-x S. Systematic comparative experiments confirmed the cooperative roles of heterojunction architecture, electron transfer dynamics, cobalt active sites, and H 2 O 2 in PMS activation. Degradation intermediates were identified by gas chromatography spectrometry (GC) and liquid chromatography-mass spectrometry (LC-MS), while electron spin resonance (ESR) and radical trapping experiments established SO 4 •− as the predominant reactive species. This study provides a new approach for the construction of S-scheme heterojunction photocatalysts, the activation by PMS, and the treatment of PET plastic in water.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Boding Zhang,Zhonghu Dong,Yanyu Wang,Xiaobo Feng,Jiameng Liu,Yunhun Yan,Dong Liu,Tianjun Ni,Baozhong Liu
The efficacy of peroxymonosulfate (PMS) activation is critically dependent on interfacial charge dynamics in photocatalytic systems. While covalent organic frameworks (COFs) show promise, their performance is often limited by suboptimal charge separation. Herein, we construct a metal-free S-scheme heterojunction by integrating TphDha COF with C 3 N 5 to achieve precise interfacial charge modulation. This unique architecture, stabilized by intramolecular hydrogen bonds, establishes a built-in electric field that drives the directed migration and spatial separation of photogenerated carriers, thereby preserving their high redox potential. The optimized heterostructure exhibits significantly enhanced visible-light absorption and charge separation efficiency, which synergistically boosts the activation of PMS. Under visible light irradiation, the system achieves a superior tetracycline degradation efficiency of 96.9% and maintains over 90% efficiency after multiple cycles, demonstrating remarkable catalytic stability and reusability. The interfacial charge transfer mechanism was elucidated through in-situ characterization and theoretical calculations. Furthermore, the degradation pathways, toxicity evolution of intermediates, and the system's efficacy in continuous-flow operation, real water matrices, and complete bacterial inactivation were comprehensively investigated, underscoring its practical potential for environmental remediation. This work provides profound insights into interface engineering for designing efficient metal-free catalytic systems.
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