Applied Sciences-Basel
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2024
·Vol. 14
·期 18
·8285
·
IF 2.5
Yihang Liu,Zongmao Lu,Jiajie Wang,Jinghui Lai,Ziyang Li,Chu Zhang,Yuhang Qi
Cu interconnect chemical mechanical polishing (CMP) technology has been continuously evolving, leading to increasingly stringent post-CMP cleaning requirements. To address the environmental pollution caused by traditional post-CMP cleaning solutions, we have explored the use of photocatalytic processes to remove citric acid, which is a commonly used complexing agent for CMP. In this study, CeO2abrasives, characterized by a hardness of 5.5, are extensively employed in CMP. Importantly, CeO2also exhibits a suitable band structure with a band gap of 2.27 eV, enabling it to photocatalytically remove citric acid, a commonly used complexing agent in Cu CMP. Additionally, the integration of H2O2, an essential oxidant in Cu CMP, enhances the photocatalytic degradation efficiency. The research indicates that the removal rate of single-phase CeO2was 1.78 mmol/g/h and the degradation efficiency increased by 40% with the addition of H2O2, attributed to the hydroxyl radicals generated from a Fenton-like reaction between H2O2and CeO2. These findings highlight the potential of photocatalytic processes to improve organic contaminant removal in post-CMP cleaning, offering a more sustainable alternative to conventional practices.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2024
·
IF 6.1
Tao Liu,Chang Jiang,Zekai Liu,Xuehui Zhang,Wenmin Zhao,Longfei Zeng,Lina Zhang
Reduced graphene oxide (rGO) with surface-loaded Cu particles (scCu-rGO) was prepared by supercritical CO 2 deposition, and Cu matrix composites with scCu-rGO as a reinforcement (scCu-rGO/Cu composites) were successfully prepared by ball milling for different times and spark plasma sintering (SPS). The scCu-rGO/Cu composites prepared with a ball milling time of 20 h exhibited high electrical conductivity (96.3 % IACS), tensile strength (240 MPa), and elongation (37 %). The outstanding properties are mainly ascribed to the uniform distribution of rGO by the ball milling process and rGO promoted by loading Cu particles onto its surface through supercritical deposition, which led to an interfacial reaction between rGO and Cu, resulting in the formation of a Cu 2 O transition layer with a load-transferring effect that enhanced the mechanical properties of the composites. Based on the experimental results, the strength of scCu-rGO/Cu composites is mainly enhanced by synergistic strengthening through grain refinement, Orowan looping and load transfer strengthening. This study demonstrates that the use of supercritical deposition to construct Cu 2 O transition layers can result in a strength-plasticity and high electrical conductivity match in scCu-rGO/Cu composites. The findings presented here offer new insights for innovative design of Cu matrix composites for advanced engineering applications by using supercritical deposition.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junjie Xu,Wei Sun,Xiang Xiong,Hongbo Zhang,Lingkun Yang
Spacecraft thermal protection materials need to survive long-term exposure to oxygen-containing environments at 2400 °C. In this study, a high-density and low-porosity metal-ceramic-modified composite was prepared at a low temperature (1500 °C) in the presence of W and Cu using combined slurry brushing and reactive melt infiltration methods. An investigation of the composite formation mechanism and the effects of W and Cu indicated that W and ZrB 2 were formed via dissolution-precipitation and the external diffusion of C and B, respectively. The low reaction temperature and the metallic phases significantly improved the mechanical properties, thermophysical properties, and long-term ablation behaviours of C/C–ZrC–ZrB 2 –W–Cu. Compared to traditional C/C–ZrC, the flexural strength and fracture toughness of the composite increased by 71.56 % and 90.05 % to 345.95 MPa and 14.52 MPa m 1/2 , respectively, and the thermal conductivity increased by 174.93 % to 59.11 W/m·K. In addition, W and Cu effectively lowered the surface temperature by nearly 250 °C during 300 s ablation, and the mass and line ablation rates decreased to −0.272 mg/s and −0.247 μm/s, respectively.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Cui Zhang,Saiyu Dong,Zhaoli Liu,Nairu Liu,Xi Zhang,Jie Dong,Xueping Zhou,Yirong Guo,Jianxiang Wu
Immunochromatographic test strip (ITS) has been widely employed for point-of-care diagnoses. However, how to significantly enhance the analytical sensitivity of device-free ITS remains a challenge. Here, we synthesized a Cu single-atom anchored Co 3 O 4 (CuSA/Co 3 O 4 ) nanozyme that possesses ultrahigh peroxidase-mimicking catalytic activity owing to d -band center upshift mediated by Cu single-atom. Molecular orbital analysis demonstrated that d orbitals in CuSA/Co 3 O 4 have stronger orbital hybridization affinity than Co 3 O 4 to H 2 O 2 ′s π* orbitals. This reinforces hydroxyl radical ( OH) production and provides a stronger catalytic colorimetric signal, which is beneficial for improving the sensitivity of ITS. Moreover, we applied the CuSA/Co 3 O 4 to ITS as a signal reporter for monitoring Xanthomonas oryzae pv. oryzicola (Xoc) , the pathogen of rice bacterial leaf streak. The visual limit of detection (LOD) of the developed CuSA/Co 3 O 4 -based ITS was as low as 6.4 × 10 2 CFU mL −1 , which is 25-fold more sensitive than the traditional Au nanoparticles (AuNP)-based ITS. Taken together, this work demonstrates the great potential of CuSA/Co 3 O 4 nanocomposite as a signal reporter to improve the sensitivity of ITS for on-site Xoc detection.
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FUEL
·
2025
·
IF 7.5
Zhangkai Qian,Jia-qi Bai,Mei Ma,Huangfei Liu,Mengdie Cai,Jingshuai Chen,Song Sun
N -methylation of amines, nitro compounds and nitriles with CO 2 and H 2 offers a promising strategy for CO 2 utilization. However, developing highly efficient and stable Cu-based catalysts for selective mono- N -methylation of aniline remains challenging. Herein, we report the successful synthesis of a Cu-ZnO/TiO 2 catalyst, with the optimized 5 %Cu-7.5 %ZnO/TiO 2 catalyst achieving a 96.7 % yield of N -methylaniline (MA) and an initial turnover frequency (TOF) of 7.4 h −1 after 6 h under 453 K, 2 MPa CO 2 and 4 MPa H 2 . This performance surpasses all reported Cu-based catalysts and rivals noble metal-based systems. The catalyst demonstrated reusability at least four cycles and versatility in the N -methylation of various amines, nitro compounds, and nitriles. Kinetic studies revealed reaction orders of 0 with respect to aniline concentration and CO 2 pressure, and 1 with respect to H 2 pressure. Based on kinetics and extensive characterization, we propose a reaction mechanism over 5 %Cu-7.5 %ZnO/TiO 2 , identifying Cu nanoparticles as the active sites. The process proceeds via N -phenylcarbamic acid and N -phenylformamide intermediates, with the hydrogenation of N -phenylcarbamic acid as the rate-determining step.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Anli Liu,Zhixue Zhang,Zhikui Zhou,Chengwan Wang,Yue Yuan,Qinmei Zhong,Sheng-Tao Yang
As commonly observed water pollutants, organophosphates (OPs) can induce eutrophication of water bodies and pose serious risks to the environment and human health. In this study, we investigated the degradation of tetramethylphosphonate (THPS), an OP, using micron-scale iron-copper (Fe/Cu) bimetals activated peracetic acid (PAA) system. Interestingly, the iron groups (i.e., Fe, Fe/Cu and Fe-PAA system) exhibited a biphasic response: an initial rapid response within the first 10 min followed by a slower degradation lasting from 10 to 60 min. However, the copper groups (i.e., Cu, Cu-PAA and Fe/Cu-PAA) exhibited an initial response within the first 10 min coupled with a subsequent plateau with no significant alterations thereafter. In terms of reactive oxidized species (ROS) verification, only hydroxyl radical ( • OH) was detected in the Fe and Fe-PAA systems; only singlet oxygen ( 1 O 2 ) was detected in the Cu system; organic radicals (R-O • ) and 1 O 2 were detected in the Cu-PAA and Fe/Cu-PAA systems respectively; while • OH, R-O • and 1 O 2 were all detected in the Fe/Cu-PAA system. The presence of Cu promoted the release of electrons from iron and strengthened the single-electron transfer mode. Notably, after five consecutive runs, the removal efficiency of THPS remained above 80 %, and the k obs during the first ten minutes (11.28, 10.11, 9.12, 8.29, and 8.45 min −1 ) remained high and stable throughout the cycles. XPS spectra analysis demonstrated that for 5 cycles, the surface content of Fe 0 /Fe 2+ and Cu 0 /Cu + in the utilized materials surpassed that of the pristine Fe/Cu bimetals, indicating the self-renewal of Fe/Cu bimetals. These findings highlight the potential of Fe/Cu bimetals in effectively degrading THPS and reducing its environmental impact.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2024
·
IF 4.1
Zhou Bai-Yang,Ma Ze-Tong,Zhong Shi-Long,Huang Zhen-Jie,Guo Qi,Feng Deng-Chong,Yuan Zhong-Ke,Lu Shao-Lin,Yang Yu-Zhao,Wang Cheng,Yu Ding-Shan,Chen Xu-Dong
The burgeoning growth of the new energy vehicles and aviation industry has escalated the need for energy storage capacitors capable of stable operation in harsh environments. The advent of metal-polyimide complexes has illuminated a novel approach for preparing temperature-resistant capacitors. However, the general application of these metal-polyimide complexes is impeded by the high dielectric loss and low breakdown strength, consequences of main-chain coordination and excessive metal ions content. Herein, our study proposes a novel polyimide-Cu complex material (POP-Cu) predicated on side-chain-type pyridine-Cu coordination, utilizing the structural backbone PMDA-ODA of mature commercial PI (Kapton) with reliable performance. Owing to the high degree of freedom afforded by the side chain with suppressed relaxation activation energy and the long-range electron delocalization formed by d - π coordination, the dielectric constant of this material containing merely 2.7 mol% Cu increases from 3.25 (POPI) to 5.58, while maintaining a remarkably low dielectric loss of 0.0066. Meanwhile, this material exhibits a substantial DC breakdown strength of 436.2 MV·m −1 and a high energy density of 5.42 J·cm −3 , coupled with superior mechanical and thermal properties. Even at 150 °C, it retains over 90% of its room-temperature energy density, demonstrating notable dielectric stability under high temperatures. These attributes underscore its promising application for capacitors operating in harsh environments.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Xiangxue Zhang,Nina Fei,Qianhong Wang,Ali Raza Khan,Wenyao Chen,Gang Qian,Jing Zhang,De Chen,Xuezhi Duan,Xing-Gui Zhou,Weikang Yuan
Oxygen vacancy regulation in metal catalysts has emerged as a crucial strategy for efficiently degrading volatile organic compounds (VOCs), while the acquisition of kinetics and mechanistic insights into the oxygen vacancy roles remains highly desirable yet challenging. Herein, we conduct a combined kinetics and mechanistic investigation into the oxygen vacancy effects of Cu catalysts on toluene oxidation. Cu catalysts with varying oxygen vacancy contents are prepared using three representative metal oxide supports, including reducible ZrO2 with strong oxygen storage capacity, reducible ZnO, and unreducible Al2O3. The toluene oxidation as well as CO oxidation are tested for these catalysts, revealing the superior catalytic activity of Cu/ZrO2 catalyst. Multiple charactrizations demonstrate that the strong reducibility and abundance of oxygen vacancies within the Cu/ZrO2 catalyst are the key factors for these reactions. A redox-based kinetics strategy is further applied to decouple the reduction and oxidation steps, thus affording a rate diagram to elucidate the promotional effects of oxygen vacancies on toluene decomposition. Additionally, in-situ DRIFTS study unveils the reaction pathway, showing the transformation from toluene to benzyl alcohol, benzaldehyde, benzoate, phenol, anhydride, carbonate, and ultimately to CO2. As a result, the oxygen vacancy-tuned rate-relevant step is disclosed, shifting from C-H bond cleavage for the Cu/Al2O3 catalyst with limited oxygen vacancies to the C=O and C=C bond cleavage for the Cu/ZnO and Cu/ZrO2 catalysts with more oxygen vacancies. The kinetics and mechanistic insights gained here would help guide the design of highly efficient oxidative catalysts by tuning the oxygen vacancies of support.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Jing Yao,Huiying Wang,Ziwang Che,Bolin Feng,Hailong Cheng,Yingying Huang,Yunlong Zhou,Qiuping Qian,Zhenbin Chen
Despite the continuous exploration and development of new antibiotics, the emergence of super-resistant bacteria has led to a gradual loss of effectiveness in some antibiotics. Developing new methods and applying antimicrobial materials can effectively reduce antibiotic usage, thereby slowing down the emergence of bacterial resistance. Herein, we present a novel micro-nano composite antimicrobial material synthesized through a one-pot method. This innovative system integrates ZnO, Cu2O, and CuCO3 onto CaCO3 carriers, demonstrating dual advantages of structural simplicity and functional synergy. The composite exhibits exceptional antimicrobial performance with minimum bactericidal concentrations of 15.625 µg/mL against Gram-negative bacteria and 7.8125 µg/mL against Gram-positive bacteria, while maintaining favorable biosafety. Mechanistic studies reveal a dual bactericidal action: (1) physical disruption of bacterial membranes through permeability alteration and structural damage, leading to critical cellular component leakage (e.g., DNA); (2) intracellular reactive oxygen species (ROS) overproduction triggering oxidative stress. Characterization by thermogravimetric analysis confirms its thermal stability and suitability for polymer processing. The cost-effective synthesis protocol and scalable production potential position this copper-zinc micro-nano composite as a promising candidate for advanced antimicrobial plastics engineering, addressing both efficacy and industrial feasibility requirements.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Weiting Zhong,Jiaqi Lu,Jun Hou,Hui Li,Lixia Ma,Xu Zhang,Yanbao Zhao
In this study, water soluble Cu-doped CdS quantum dots (Cu:CdS QDs) were synthesized by one-pot method. The effect of reaction conditions on the Cu:CdS QDs were studied systematically, and the Cu:CdS QDs synthesized under optimizing condition possessed a small size (∼4 nm), high luminance and good self-fluorescence performance. Compared with CdS QDs, the fluorescence emission was redshifted from 627 nm to 720 nm. To reduce cytotoxicity of Cu:CdS QDs, carboxymethyl chitosan (CMCS) molecules were selected to be grafting onto the surface of Cu:CdS QDs through amide bonds and the CMCS modification would greatly impede the release of cadmium ions . Both in vitro cellular cytotoxicity and hemolysis assay demonstrated that the CMCS/Cu:CdS QDs were highly biocompatible and the CMCS/Cu:CdS QDs as fluorescent probes were successfully applied in vivo imaging of small animals and this QDs can be easily metabolized by mice over time without adverse reactions . This new nanoprobes open up exciting opportunities for future biomedical applications .
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 12
·1-13
·
IF 5.3
Wang Xue,Zhao Zixuan,An Long,Wang Tianxiang,Yang Xiaojing,Shan Jiajia
An unlabeled electrochemical sensing strategy based on electroactive copper-centered metal–organic framework (Cu-MOF) film coupled with multiwalled carbon nanotubes (MWCNTs) was proposed for the rapid assessment of nanoplastic concentration. The sensing interface was fabricated via the electro-deposition of Cu-MOF on the pre-modified MWCNTs using the cathodic reduction method. The exposed copper active sites in Cu-MOF showed excellent electrochemical activity, which was further enhanced due to rapid electron transfer induced by highly conductive MWCNTs. Through the adsorption functionality of Cu-MOF film towards polystyrene (PS) nanoplastics, the rapid recognition for nanoplastics in aqueous solution was achieved, thereby causing the inhibition of the current response. The results showed a robust dependence of the inhibition rate on the PS mass concentration. The proposed detection method was used for the quantitative determination of PS nanoplastics with the sizes of 100 nm, 500 nm, and 1 μm. The applicability of this electrochemical sensing platform was successfully validated in real-world water sample analysis. Graphical abstract
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Nano Today
·
2024
·
IF 13.2
Hui Huang,Wendi Xuan,Jiakang Hai,Xue Wang,Meng Chen,Guobing Hong,Xinyue Dai,Lili Xia,Wei Feng,Yu Chen
Bioorthogonal reaction refers to chemical reactions that occur within a biological system without interfering the normal biochemical process, offering the unprecedented versatility in engineering chemical reactions within cells. However, the precise regulation of bioorthogonal reaction in living systems is mired by the complexity of the physiological environment and the toxicity of catalysts. Herein, considering the deeper tissue penetration and reduced phototoxicity compared to visible light and ultraviolet, a second near infrared (NIR-II) light-activated Cu-based bioorthogonal reaction is developed to achieve precise spatiotemporal control and effective switching for Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) mediated chemical transformations in tumor, reducing the off-target effects. The catalytic activity of Cu catalyst through valence state interconversion between Cu(II) and Cu(I) can be precisely regulated in a reversible manner under NIR-II light irradiation-induced photoelectron transfer, which controls the extent of desired drug synthesis in bioorthogonal reaction. Meanwhile, the adverse effects of Cu(I) can be substantially mitigated within normal tissues due to their oxygen-rich condition. By utilizing NIR-II light and oxygen level, the Cu bioorthogonal catalyst achieves a balance between catalytic activity and biocompatibility. The ability to achieve precise spatiotemporal control and reversible catalysis makes this NIR-II light-mediated CuAAC platform an efficient and adaptable tool for bioorthogonal chemistry in living systems.
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