MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2025
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IF 4.6
Ziwen Yang,Boyang Guo,Keyan Liu,Zhi Zhu,Donglai Han,Cong Wang,Jing Song
Although surface enhanced Raman spectroscopy (SERS) has become a powerful analytical technique for ultrasensitive molecular detection, it still faces challenges including instability, unrepeatability, and non-recyclable. The rational design and fabrication of SERS substrates that are simultaneously stable, reproducible, and recyclable remains a critical yet unmet need. Here, we present a flexible polyimide-silver (PI/Ag) nanofiber-based SERS platform, synthesized via electrospinning and in-situ reduction techniques. The spatial distribution and density of Ag nanoparticles (NPs) were precisely regulated by tuning the type and concentration of reducing agents, which effectively modulated the localized surface plasmon resonance (LSPR) effect to optimize SERS performance. Among the tested formulations, the PI/Ag-NB substrate—prepared using NaBH 4 as the reducing agent—exhibited the most favorable nanoparticle dispersion and the strongest SERS activity. Using 4-aminothiophenol (4-ATP) as a probe molecule, the PI/Ag-NB substrate achieved a maximum enhancement factor (EF) of 1.17 × 10 7 . Beyond its high sensitivity, the substrate demonstrated broad spectral responsiveness, enabling the reliable detection of diverse analytes such as methylene blue (MB), methyl violet (CV), Congo red (CR) and malachite green (MG). To further validate its practical utility, long-term stability, and recyclability, the substrate was employed for the detection of 2,4-dichlorophenoxyacetic acid (2,4-D) pesticide residues both in aqueous solutions and soil extracts. Notably, the substrate stored for 30 days maintained performance over 10 consecutive detection cycles, their robustness and reproducibility. The platform achieved a measured detection limit of 10 −10 M, with a theoretical limit reaching as low as 3.12 × 10 −11 M, highlighting the ultrasensitive detection capability of the substrate. Collectively, these findings establish PI/Ag-NB nanofibers as a versatile and high-performance SERS platform, paving the way for their practical applications in environmental monitoring, food safety, and chemical sensing.
研究领域:
分析化学
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纳米技术
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环境监测
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食品安全
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化学传感
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材料科学
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 16
·4135
·
IF 3.1
Zijia Wang,Yawen Chang,Siyang Jia,Fujuan Liu
In this study, polyimide (PI) and polysulfonamide (PSA) were used as base materials, and polyethylene glycol (PEG) was added to successfully prepare PI/PSA/PEG nanofiber membranes through electrospinning technology. Subsequently, water etching was performed on the membranes, utilizing the water solubility of PEG to form the rough wrinkled structure, further enhancing the surface hydrophobicity. The experimental results showed that under the conditions of a spinning voltage of 10 kV, PI/PSA mass fraction of 15 wt.%, and PEG-to-PI/PSA mass ratio of 1/3, the obtained fiber membranes exhibit a uniform morphology (an average diameter of 0.73 µm) and excellent hydrophobicity (the initial water contact angle (WCA) reaching 130.4°). After PEG water etching, the surface of the PI/PSA/PEG hydrophobic membranes formed the rough wrinkled structure, which not only improved their mechanical properties but also further enhanced their hydrophobicity (the initial WCA increasing to 137.9°). Hence, fiber membranes are expected to have broad application prospects in fields such as waterproofing and moisture permeability.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Xiangyu Mei,Azim Abdullaev,Qingbiao Yang,Kun Peng,Shuaida Shi,Fujian Liu,Yinsong Si,Yaqin Fu
Polyimide (PI) has been extensively used in 5G microelectronics however the relatively high dielectric constant (∼3.5) and moisture adsorption have greatly limit its practical applications in high-frequency region. Here hydrophobic PI/SiO 2 composite films with low dielectric constant and excellent thermal stability were synthesized by dispersing methyl modified hollow silica nanospheres (MHS) into polyamic acid solution prior to imidization treatment. Comparing with unmodified hollow silica nanospheres (HS), the MHS obtained through methyl modification can disperse uniformly in the PI matrix. Thus, the relaxation and orientation polarization of the PI chains as well as their electron migration are suppressed, resulting in a significant decrease in dielectric constant. The PI/MHS-10% film exhibits a stable low dielectric constant (1.9–2.3) in the high-frequency range (8.2 GHz–12.4 GHz), meanwhile maintains a high breakdown voltage (192 kV/mm), mechanical properties (64 MPa) and an excellent thermal stability ( T d5% = 546.5 °C; T max = 589.0 °C). Moreover. PI/MHS demonstrates much lower linear expansion coefficient of 25.0 ppm/K that better matches the substrate. The surface contact angle of PI/MHS increases from 73° to 110° and the water absorption rate decreases from 3.1% to 1.6%, effectively avoiding the moisture adsorption. This work provides a simple method to prepare high-performance composite films for 5G practical applications.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Chenlu Li,Yuanyuan Yang,De Wang,Yongli Wang,Shixuan Zhu,Chaoqi Zhang,Huatang Cao,Yue Du,Zhenyu He,Yinyu Xiang,Junsheng Li
The practical application of high-energy-density potassium metal batteries (KMBs) is currently hindered by severe safety hazards derived from dendritic growth and the energy-diluting nature of electrochemically inactive components. Here we report a synergistic multi-functional strategy to construct an active separator (MoS 2 /PI), comprising a robust polyimide (PI) nanofiber skeleton and a kinetic-regulating MoS 2 coating. Corroborated by theoretical simulations and experimental characterizations, the potassiophilic MoS 2 layer effectively modulates the local electric field and minimizes the nucleation barrier, thereby orchestrating a uniform K + flux for dendrite-free deposition. Distinguishing this work from conventional inert barriers, the proposed design activates the separator into an energy-boosting component. Both the accessible carbonyl sites in the PI backbone and the MoS 2 coating participate in reversible potassiation. They contribute individual specific capacities of ∼7.0% and ∼21.2% relative to the KPB cathode, respectively, achieving a total capacity enhancement of ∼28.2%. Benefiting from this dual-active mechanism, the K||K symmetric cells exhibit ultra-stable cycling for over 4000 h. Potassium Prussian Blue (KPB)||K full cells equipped with the MoS 2 /PI separator deliver a superior capacity of 93.1 mAh g -1 , significantly outperforming those using commercial PP (69.3 mAh g -1 ) and GF (72.6 mAh g -1 ) separators. The device also demonstrates exceptional durability by maintaining 80.7% capacity after 1000 cycles, corresponding to a stable lifespan of 3270 h. This study validates the active separator strategy as a critical pathway for developing next-generation high-energy-density alkali metal batteries.
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高影响因子
NANO
·
2020
·
IF 1.566
Mengfan Liang,An’ni Yang,Yan Zhu,Shuhong Sun
In this paper, the effects of SiO 2 size (ranging from 5.7 Å to 7.50 Å) and shape (spherical, cylindrical and rod) on the interface structure and the thermodynamic performance of polyimide (PI)/SiO 2 composites were investigated by molecular dynamics simulation. Also, whether the nanofiller with isocyanate propyl triethoxysilane (ICTOS) can highly enhance interaction in PI/SiO 2 (bonded PI/SiO 2 ) was investigated by experiment. To enhance the interfacial intensity efficiency, the coupling agent ICTOS was used to modify the surface of the silica nanoparticle. The results showed that the size and shape of SiO 2 not only affect the interfacial number of hydrogen bonds and the interfacial area, but also impact on the glass transition temperature of the composites. As the radius of the embedded nanosilica increased, the bonded energy and T g gradually decreased, showing a prominent filler size effect. At the same time, the T g of spherical-type system was significantly greater than the nanosystems of other shapes. This is because as the number of surface atoms and superficial area of the spherical filler are higher than the nanofillers of other shapes, the combination between spherical-type silica and the PI chains is more compact than those between cylindrical and rod-like silica and the PI chains. The contributions of different nanofillers to the filler size dependency of T g of the nanocomposites can be elucidated by comparing the interfacial interaction and net structure between the PI matrix and silica which exhibit prominent filler shape and size dependency. Finally, the results were confirmed by the nonbonded interaction energy and reduced radial distribution function (RRDF), and the highly interaction interface is found to bring about a greater reinforcing effect.
研究领域:
材料科学
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热力学
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界面化学
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DOI
高影响因子
Inorganic Chemistry Frontiers
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2024
·Vol. 11
·期 12
·3585-3595
·
IF 6.1
Haoyu Li,Yawei Xiao,Xu Tian,Xinxin Xing,Minhua Cao,Yude Wang
Electrochemical water splitting is crucial for sustainable energy and environmental conservation, meeting global energy needs while addressing environmental concerns. However, unlocking its potential requires addressing substantial technical and scientific challenges. Crystalline/amorphous composite catalysts represent a significant advancement in water-splitting research, with unique structural compositions and tailored properties that outperform conventional catalysts, thereby enhancing the efficiency and performance in essential aspects. In this study, crystalline/amorphous-structured FeCo alloy/FeCoNi-Pi (phosphate) was synthesized through one-step electrodeposition on Ni foam (NF). While FeCo alloy demonstrates excellent conductivity, the incorporation of FeCoNi-Pi enhances active site availability, improves hydrophilicity, and optimizes electrocatalytic reaction kinetics. Consequently, crystalline/amorphous FeCo alloy/FeCoNi-Pi required significantly lower overpotentials of 77/233 mV for the hydrogen/oxygen evolution reaction (HER/OER) compared to the FeCo alloy to acquire 10 mA cm−2 current density in an alkaline environment. A complete cell comprised of crystalline/amorphous FeCo alloy/FeCoNi-Pi electrodes exhibits remarkable long-term stability and demonstrates a relatively lower voltage of 1.56 and 1.69 V, enabling 10 and 100 mA cm−2 current densities. This crystalline/amorphous composite strategy has been proven effective in designing FeCo alloy-based electrocatalysts to achieve efficient hydrogen production.
研究领域:
材料科学
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能源化学
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电化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Junjie Liu,Luxiang Zhao,Bolin Xiao,Youquan Ling,Yanjiang Bai,Mei Liang,Yang Chen,Huawei Zou
The primary material used for insulation layers in solid rocket motors is fiber-reinforced ethylene-propylene-diene monomer (EPDM) rubber-based composites. However, current research has primarily focused on the relationship between fiber/rigid resin matrix interfaces and macroscopic properties, while studies investigating the influence of fiber-flexible rubber matrix interfaces on composite macroscopic performance remain remarkably scarce. To deeply investigate the influence of the fiber-flexible rubber matrix interface on the macroscopic performance of composites, this study proposes a combined approach of coating and surface nanostructuring to construct a hybrid interfacial phase composed of graphene oxide (GO) and aramid nanofibers (ANF) between polyimide (PI) fibers and EPDM. Specifically, ANF stably binds with GO through π–π* interactions, forming a three-dimensional nanoscale surface structure that introduces nanolevel roughness. Low-field nuclear magnetic resonance (NMR) and ablation resistance analyses demonstrate that this structure facilitates the formation of a denser cross-linked network and a high-temperature-resistant architecture with uniformly dispersed GO on the fiber surface. As a result, the composite exhibits a 50% increase in tensile strength and an approximately 15% reduction in carbonization rate. This work demonstrates that optimizing the microinterfacial layer between fibers and the matrix not only enhances macroscopic mechanical properties but also achieves superior ablation resistance. The findings provide critical guidance for the development of high-performance EPDM-based insulation materials.
研究领域:
材料科学
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聚合物复合材料
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界面工程
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烧蚀性能
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产品关联
DOI
高影响因子
Energy Advances
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2022
·Vol. 1
·期 12
·1028-1034
·
IF 0
Lei He,Jian-Hua Cao,Ya-Kun Wang,Da-Yong Wu
Increasing the proportion of inorganic electrolytes in organic–inorganic composite electrolytes can significantly improve the ionic conductivity of composite electrolytes. However, this method is confronted with some problems, such as the uneven dispersion of inorganic electrolytes and the aggregation of nanoparticles, which results in a worse performance of the electrolytes’ interface. In this study, we had the dopamine hydrochloride molecules self-polymerized on the surface of inorganic ionic conductor lithium titanium aluminum phosphate (LATP) particles to obtain PDA-coated LATP nanoparticles. Then, the coated LATP particles were composited with PEO at a ratio of 80 : 20, with the LATP's evenly dispersed in the PEO, and no aggregation happened. On adding a small amount of electrolyte (5 μL cm−2, 1 M Li TFSI), the ionic conductivity of the electrospun PI-loaded PEO0.2–PDA@LATP0.8 flexible composite solid electrolyte reached 2.07 × 10−4 at 30 °C and 2.05 × 10−3 S cm−1 at 80 °C. NCM811‖Li batteries assembled with this electrolyte had an initial discharge capacity of 178.0 mA h g−1 at 30 °C, and still remained at 172.1 mA h g−1 (96.7%) after 200 cycles. The research shows that there are three main conduction pathways of Li+ in this electrolyte: through the segments of the polymer chains, through the interface between the polymer and inorganic ionic conductor, and through the passage composed of a continuous inorganic ionic conductor. Further results show that the coating of LATP by PDA does not block the transmission of Li+ both inside the crystal and at the crystal interface of LATP.
研究领域:
材料科学
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电化学
·
能源存储
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaofei Liu,Yanan Ma,Xingyao Dai,Shuxuan Li,Baowen Li,Xin Zhang
The increasing development of wearable electronics necessitates the urgent need for highly sensitive flexible pressure sensors suitable for harsh environments at high/low temperatures, thus meeting the specific requirements of wilderness survival, lunar exploration, mine exploration, and so on. Herein, a flexible piezoresistive sensor based on 3D Pt/PI fibrous network is prepared through the electrospinning and ion-sputtering techniques, demonstrating excellent sensing performance over a wide temperature range from liquid nitrogen temperature to 250 °C. The 3D Pt/PI pressure sensor achieves high sensitivity of 158.23 kPa −1 at room temperature, and remains remarkable sensitivity of 71.47 kPa −1 and 7.63 kPa −1 at 150 °C and 250 °C, respectively. Furthermore, benefiting from the hydrophobicity of the Pt/PI fibrous network, the sensitivity of the pressure sensor stabilizes in about 148 ± 10 kPa −1 under relative humidity from 30 % to 90 %, indicating humidity-independent sensing performance. As a proof of concept, the fabricated piezoresistive sensor can be not only monitor the human physiological information in real-time, but also detect external mechanical stimuli at high/low temperatures, demonstrating great potential for application in harsh environments.
研究领域:
材料科学
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传感器与执行器
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柔性电子学
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纳米技术
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可穿戴设备
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DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yipeng Tan,Hang Gao,Jiayu Deng,Linfei Lu,Lingmin Yao,Zhongbin Pan,Qinglin Deng
The application of film capacitors is limited by their poor energy storage performance and stability at high temperatures. So far, most work has been concentrated on the use of single-dimensional inorganic fillers incorporated into polymers, but it is difficult to improve the breakdown strength and polarization simultaneously, especially at high temperatures (>150 °C). We prepared (Al2O3–TiO2–Al2O3)/PI composite films by capitalizing on the benefits of distinct dimensional materials in terms of electrical and thermal properties. The experimental results show that through the reasonable multidimensional coordination design, the composite film exceeds many current high-temperature-resistant materials and can be used up to 200 °C. With the optimal filler ratio, the maximum energy density and efficiency could remain as high as 2.31 J/cm3 and 81% at 200 °C, respectively. This work demonstrates an excellent method to further improve the energy density and discharge efficiency for high-temperature dielectric polymer-based composites.
研究领域:
材料科学
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介电材料
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能量存储
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聚合物复合材料
·
高温电子学
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Yang Pan,Yaya Wang,Zhiwei Wen,Weimin Wang,Na Li,Qin Sun,Chengyuan Liu,Yang Pan
A reliable and effective MSI analysis protocol combination DESI/PI with high-resolution mass spectrometer were established. This protocol enables MSI analysis of lipids in wheat grain. Highlights specifically include. • The HPS samples detection achieved ∼23 % similarity with cryosectioning sample. • DESI/PI has a good sensitivity for both non-polar and polar lipids. • The lipids in wheat grain with different storage years were studied. • In a word, this study provides convenient sectioning method, a comprehensive identification checklist, and spatial distribution information of lipids in wheat grains. Wheat is an important cereal grain. Understanding lipid composition and distribution in wheat grain is valuable for plant, food and nutritional research. Conventional methods can analyze lipid composition and content in wheat grain, while the spatial native distribution of lipids is inevitably lost. In this paper, an effective mass spectrometry imaging (MSI) analysis protocol combining desorption electrospray ionization/post-photoionization (DESI/PI) with high-resolution mass spectrometer was established. To overcome the hardness of wheat grains and fragility of wheat grain sections, a rapid hand plane sectioning (HPS) method was developed. By employing accurate mass spectrometry peak identification, the HPS samples detection results achieved ∼23 % similarity with cryosectioning sample (same compounds). DESI/PI has good sensitivity for both non-polar and polar lipids. A small mass spectrum database for wheat grain was established which may provide strong data support for wheat grain component analysis. The rapid MSI analysis protocol was further used to explore the spatial distribution changes of lipids in wheat grain with different storage years, indicating that DESI/PI was a potential means of studying wheat grain aging. This study provides a convenient sectioning method, a comprehensive identification checklist, and spatial distribution information of lipids in wheat grains, which holds potential significance for guiding improvements in wheat grain processing & storage, slowing down the aging, and ensuring grain quality.
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Meng Yuan,Lingling Huang,Qi Zhang,Mingquan Huang,Baocai Xu,Liangyun Yu
Novel S-scheme heterojunction boosts light absorption/charge separation. • In-situ Co-Pi co-catalyst reduced electron-hole recombination. • Polypyrrole-MIP membrane ensures DIM recognition with maintained conductivity. • The sensor achieves ultra-sensitivity: LOD 0.83 fmol/L, 1.0 fmol/L-100 pmol/L range. • The new sensors demonstrated reliable DIM detection in real samples. An S-scheme TpPzda-COF@ZnIn 2 S 4 @Co-Pi core–shell hybrid was fabricated via in situ growth of a ZnIn₂S₄ nanoflower shell on a β-ketoenamine-linked TpPzda-COF core, followed by photodeposition of a cobalt-phosphate (Co-Pi) cocatalyst. The resulting hierarchical architecture facilitated efficient interfacial charge transfer and synergistic effects, leading to enhanced light absorption, charge separation, and catalytic activity. Based on this photoactive material, a molecularly imprinted photoelectrochemical (MIP-PEC) sensor was constructed through electropolymerization using pyrrole as the functional monomer and dimethoate (DIM) as the template. The imprinted cavities enabled selective recognition of DIM, regulating interfacial electron transfer and producing distinct photocurrent responses. Benefiting from the π-conjugated structure of TpPzda-COF, the visible-light activity of ZnIn 2 S 4 , and the hole-extraction capability of Co-Pi, the proposed sensor exhibited high sensitivity, good stability, and satisfactory reproducibility. An ultralow detection limit of 0.83 fmol·L −1 was achieved over a wide linear range of 1.0 fmol·L −1 to 100 pmol·L −1 . Furthermore, successful determination of DIM in real fruit and vegetable samples demonstrated the applicability of the sensor for food safety and environmental monitoring. Download: Download high-res image (95KB) Download: Download full-size image
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高影响因子
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