Carbon Letters
·
2024
·Vol. 34
·期 5
·1317-1327
·
IF 5.5
Yang Xiaohong,Cheng Xingwang,Chen Yu,Xiao Peng
To reduce production cost and inhibit the aggregation of graphene, graphene oxide and copper nitrate solution were used as raw materials in the paper. Cu particles were introduced to the graphene nanosheets by in-situ chemical reduction method in the hydrazine hydrate and sodium hydroxide solution, and the copper matrix composite reinforced with Cu-doped graphene nanosheets were fabricated by powder metallurgy. The synthesized Cu-doped graphene was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The relative density, hardness, electrical conductivity and tensile strength of the copper matrix composite reinforced with Cu-doped graphene were measured as well. The results show that copper ions and graphene oxide can be effectively reduced by hydrazine hydrate simultaneously. Most of oxygen functional groups on the Cu-doped graphene sheets can be removed dramatically, and Cu-doped graphene inhibit the graphene aggregation effectively. Within the experimental range, the copper matrix composites have good comprehensive properties with 0.5 wt% Cu-doped graphene. The tensile strength and hardness are 221 MPa and 81.6 HV, respectively, corresponding to an increase of 23% and 59% compared to that of pure Cu, and the electrical conductivity reaches up to 93.96% IACS. However, excessive addition of Cu-doped graphene is not beneficial for the improvement on the hardness and electrical conductivity of copper matrix composite.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·11013-11025
·
IF 4.682
Luo Guoqiang,Li Peibo,Hu Jianian,Guo Jingwei,Sun Yi,Shen Qiang
The purpose of this paper was to design an Al–Cu–Ag–C material system to address the deterioration of mechanical properties caused by intermetallic compounds generated during Al–Cu sintering. The in situ pyrolytic C layer was encapsulated on the surface of the raw material particles, which prevented Al–Cu diffusion and reduced the generation of intermetallic compounds. The microstructure of the Al–Cu–Ag–C composites illustrates that several alloy phases of Al 2 Cu, Al 4 Cu 9 , and Ag 2 Al are formed. The addition of Ag significantly improved the mechanical properties of the composite due to the formation of the Ag 2 Al phase and Cu–Ag solution. The tensile strength and compressive strength of Al–52Cu–3Ag–C are increased by 123.9% and 64.9% over Al–52Cu–C, and the strain is also considerably improved. The strength enhancement derived from the Orowan strengthening contributed by Ag 2 Al, and the solid solution strengthening contributed by Ag–Cu solid solution, respectively. The presence of Ag 2 Al also enhances the hardness of the composite.
研究领域:
材料科学
·
力学
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DOI
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 6
·期 2
·1801200
·
IF 4.834
Yutian Wang,Hanjun Hu,Yufan Sun,Yang Tang,Liming Dai,Qing Hu,Adrian Fisher,Xiao Jin Yang
Nanostructure and crystallinity of transition metals play an important role in catalyzing carbon dioxide electroreduction (CO 2 ER) where Cu is a typical electrocatalyst with a wide variety of products and Pb has a high overpotential for H 2 evolution and is selective toward formic acid. In this study, 3D hierarchical nanostructures of Cu–Pb catalyst are prepared by a two-step electrodepositing–annealing–electroreduction approach (EAE). Cu nanowires (Cu NWs) of 200–400 nm diameter are built on the surface of commercial nickel foam substrates through an EAE step. Then, Pb nanoparticles with diameter of 5–10 nm are uniformly created on the surface of Cu NWs by a second EAE step. The nanostructural Cu–Pb electrodes catalyze CO 2 ER at a current density of −9.35 mA cm −2 (at −0.93 V vs reversible hydrogen electrode (RHE)). The H 2 evolution is suppressed by 35.6% and CO and HCOOH are enhanced by 29.6% and 9.2%, respectively, as compared with Cu NWs. The protocol proposed in this study provides a simple and straightforward approach for preparing high-performance, hierarchical nanostructures of Cu–Pb bimetal catalyst for CO 2 ER.
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DOI
高影响因子
Journal of Materiomics
·
2019
·Vol. 5
·期 3
·489-495
·
IF 0
Ruonan Wu,Zhili Li,Yongbo Li,Li You,Pengfei Luo,Jiong Yang,Jun Luo
Superionic conductors, which exhibit liquid-like phonon transport but crystal-like carrier transport, have attracted great attention and broad research interest in the thermoelectric community. Ag 2 Te is a superionic conductor; however, its small band gap and large Ag vacancy formation energy impede its application as a prominent p-type thermoelectric material. In this work, synergistic optimization of the thermoelectric performance of Ag 2 Te through Cu substitution is realized through a combination of experimental and theoretical efforts. For the electrical transport, Cu substitution systematically increases the band gap of Ag 2 Te and reduces the cation vacancy formation energy. These two beneficial effects simultaneously increase the electrical conductivity and suppress the bipolar effect, thereby greatly enhancing the p-type electrical transport properties of Ag 2 Te. For the thermal transport, alloying Cu 2 Te with Ag 2 Te significantly reduces the thermal conductivity through not only point defect scattering but also softening of the interatomic interactions. The latter is attributed to the relatively small Cu atoms vibrating in the oversized 8c sites. This two-fold optimization results in maximum thermoelectric figure of merit zT values of over 1.3 at 773 K for both Ag 1.2 Cu 0.8 Te and AgCuTe, demonstrating the great potential of Ag 2− x Cu x Te as a promising p-type thermoelectric material system.
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Peng Chen,Sanyuan Hu,Ting Zhou,Heping Li,Youwei Yan
Cu/TiN hybrid nanofibers were successfully fabricated by applying nitridation procedure to CuO/TiO 2 nanofibers. Through modifying the nitridation temperature, the electrical conductivity of Cu/TiN nanofibers was tunable, which could achieve a high value of 320 S/cm-approximately three times that of TiN nanofibers. The oxidation resistance property of the resulting Cu/TiN nanofibers was assessed. With the excellent chemical stability of TiN composition, hybrid Cu/TiN nanofibers possessed greatly enhanced thermostability. Moreover, by taking advantage of readily fiber patterning using electrospinning, Cu/TiN nanofiber networks were assembled as transparent electrodes, which reached an optoelectrical achievement of 34.4 Ω/sq at 83.2% transparency. Given its low-cost, enhanced thermostability, together with considerable optoelectrical achievement, Cu/TiN nanofiber is therefore expected to offer a new platform for cost-efficient transparent electrode.
研究领域:
材料科学
·
纳米技术
·
电子学
·
能源材料
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DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Jiahao Wang,Xianbin Jia,Shiyun Lou,Guihui Li,Shaomin Zhou
There are many studies concentrated on high-temperature performance of SnSe2, but few studies were conducted on low-temperature properties of embedded SnSe2. In this work, a series of SnCuxSe2 (x = 0, 0.01, 0.02, and 0.05) layered structures have been successfully synthesized by a melt quenching, mechanical milling process, and spark plasma sintering (SPS) method. Meanwhile, the thermal and electrical transport properties of all synthesized samples are measured. These results suggest that the embedding of Cu into SnSe2 results in a high carrier concentration (1019/cm3). In addition, the enhancement of defect and interfacial phonon scattering caused by Cu embedding as well as the weak van der Waals force between layers makes a low thermal conductivity (0.81 W/mK) for the SnCu0.01Se2 at 300 K. Moreover, the maximum ZT is acquired up to 0.75 for the SnCu0.01Se2 sample at 300 K, which is about 2 orders of magnitude higher than the pristine sample (0.009). These features indicate that Cu-embedded SnSe2 can be a promising thermoelectric material at gentle temperature.
研究领域:
材料科学
·
热电学
·
固体物理
·
纳米材料
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DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Yanan Chen,Yuanbo Zhao,Weijun He,Yanan Liu,Hongna Xing,Xiuhong Zhu,Yanqun Guo,Juan Feng,Chunyan Liao,Yan Zong,Xinghua Li,Xinliang Zheng
Significant volume changes and slow ionic transport during charge/discharge processes restrict the improvement of electrochemical performance for Cu x S (x = 1–2). Herein, a new strategy by introducing Cu-BTC (copper(II)-benzene-1,3,5-tricarboxylate) as a processor to derive three-dimensional Cu 1.81 S@C using green sulfurization and calcination methods is proposed. Benefiting from the high electrical conductivity , multistage pore size structure and stable structure brought by the conductive carbon skeleton after calcination , Cu 1.81 S@C-650 o C exhibits a high specific capacitance of 291.1 F g -1 at a current density of 1 A g -1 and a superior rate capability of 83.6 % at a current density of 10 A g -1 . In addition, the assembled asymmetric supercapacitor (Cu 1.81 S@C-650 o C//AC ASC) also shows impressive performances, such as an energy density up to 16 Wh kg -1 at a power density of 352 W kg -1 and an excellent cycling stability of 93.1 % over 5000 cycles at a current density of 2 A g -1 . This work demonstrates that the Cu-BTC-derived Cu 1.81 S@C is an attractive material with potential applications in energy storage devices.
研究领域:
材料科学
·
能量存储
·
超级电容器
·
金属有机框架（MOFs）
·
纳米材料
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Minqin Huang,Erhao Wang,Xiuju Li,Zhiying Wei,Tiantian Wang,Ao Wang,Li Yang
In this study, a fascinating nanoplatform, possessing fluorescent imaging, hyperthermia-amplified reactive oxygen species (ROS) generation, and calcium-overloaded comediated multimodal therapeutic effects toward breast malignancy, was innovatively constructed. Accordingly, engineering this accurate targeting theranostic scheme can be used for efficacious ablation of breast carcinoma. Because Cu and Ca ions can induce ROS generation and cytoplasmic overaccumulation, respectively, here, a Cu–Ca-based nanoplatform was designed by adsorbing indocyanine green (ICG) through the relatively high specific surface area and Arg-Gly-Asp peptide (RGD) decorating by covalent conjugation. Upon the internalization of breast tumor cells, biodegradation was triggered under an intracellular weak acid microenvironment; the released ICG molecules allowed for near-IR (NIR) II fluorescent imaging and photothermal production. Importantly, Cu ions in the nanoplatform guaranteed more efficient Fenton-like reaction-mediated chemodynamic therapy under NIR laser exposure. Meanwhile, the virus-like hollowed Cu–Ca (VhCu-Ca) nanoplatform created an artificial calcium-overloading stress in the cytoplasm. In vitro and in vivo studies have demonstrated that our proposed Cu–Ca-based nanoplatform integrated the advantages of breast tumor targeting, NIR II fluorescent imaging, and efficient ablation via synergistic treatments. Therefore, this multimode nanoplatform developed a facile and versatile strategy for the diagnosis and suppression of breast tumors.
研究领域:
纳米医学
·
癌症诊疗一体化
·
生物医学工程
·
活性氧研究
·
光热治疗
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DOI
高影响因子
Science China-Materials
·
2020
·Vol. 64
·期 5
·1087-1094
·
IF 6.098
Wang Rui,Shi Faxing,He Xin,Shi Jinqiang,Ma Tao,Jin Song,Tao Zhanliang
The uneven deposition of lithium (Li) on current collectors causes serious dendrite growth and volume expansion. Commercial foamed copper (Cu) current collectors are unsuitable for Li anodes because of their large volume and mass and lithiophobic nature. Herein, a three-dimensional (3D) copper@tin (Cu@Sn) nanocone current collector with small volume, light weight, and lithiophilic nature was prepared by a simple electrodeposition method. The synergy of the nanoconical structure and lithiophilic Sn promotes the even deposition of Li and effectively inhibits the formation of Li dendrites. The resultant half batteries exhibit high Coulombic efficiency of 97.6% after 100 cycles at 1 mA cm −2 , and the symmetrical Li battery demonstrates a prolonged lifespan of over 600 h at 1 mA cm −2 . The full battery based on organic liquid electrolyte with LiFePO 4 also exhibits a long lifespan of 550 cycles with high capacity retention of 95.1% at 1 C. Moreover, 3D Cu@Sn nanocone-based solid-state batteries exhibit excellent electrochemical performance and show no decay after 500 cycles at 1 C. Our work provides a strategy for fabricating 3D current collectors for high-energy-density Li metal batteries.
研究领域:
材料科学
·
电化学
·
储能
·
纳米技术
·
锂离子电池
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Hong Qian,Binxia Yuan,Yuhao Liu,Weiling Luan
This study employed a simple low-temperature hydrothermal and sintering method to prepare TiO 2 (referred as T) heterostructure with different surface hydroxyl concentrations. Auger analysis indicated the binding energy peaks at 565 eV and 570 eV were corresponded to Cu 2+ and Cu 0 , respectively, which proved that the heterostructure was TiO 2 /CuO/Cu (referred as TC). Meantime, XPS and FTIR indicated that altering the calcination temperature was beneficial for controlling the proportion of surface hydroxyl groups (-OH). Among the samples, TC calcined at 300 °C (denoted as TC-300 °C) exhibited the highest photocatalytic performance, delivering an H 2 evolution rate of 182.68 μmol g −1 h −1 , which is 3.3 times and 1.9 times higher than those of T and the uncalcined TC sample, respectively. DFT calculations showed that the rate-determining step of the oxygen evolution reaction (OER) occurred at the *OH adsorption step. By comparing different hydroxyl adsorption sites on TiO 2 , CuO, and Cu, it was confirmed that hydroxyl groups adsorbed near Ti atoms were more favorable for improving catalytic activity. Additionally, the electron transfer process in TiO 2 /CuO/Cu heterostructure was proposed. This provided insights for the preparation of highly efficient catalysts that can promote photocatalytic water splitting half-reactions and improve hydrogen production efficiency.
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Hongming Hou,Xiaoxue Liang,Xianglong Li
Efficient Cu 2+ -creatinine complexation is essential for the sensitivity of Cu-based non-enzymatic electrochemical creatinine sensors. Herein, a morphological optimization strategy for Cu nanostructures was applied to promote Cu 2+ -creatinine complexation. Accordingly, a screen-printed carbon electrode (SPCE) was pretreated with saturated sodium carbonate to form P-SPCE and subsequently subjected to one-step electrodeposition to fabricate a multi-morphological Cu-modified electrode (Cu/P-SPCE). The resulting multi-morphological Cu architecture enhances creatinine adsorption and facilitates the efficient formation of Cu 2+ -creatinine complexes, leading to improved detection sensitivity. Electrochemical testing revealed that the Cu/P-SPCE sensor achieved a wide linear range from 5 to 400 μM, a sensitivity of 5.01 μA·μM −1 ·cm −2 , and a detection limit of 2.86 μM. It showed promising selectivity for common interferences, such as uric acid and ascorbic acid, and excellent batch-to-batch reproducibility, with a relative standard deviation of 1.40% ( n = 12). Validation using human urine samples demonstrated good agreement with clinical enzyme assays, with accuracies exceeding 91.50%. These results indicate that morphological optimization of Cu-based electrodes provides an effective strategy for sensitive creatinine detection.
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产品关联
DOI
高影响因子
TALANTA
·
2026
·
IF 6.7
Wenkai Zhang,Yingxi Qin,Lanxiu Ni,Yushu Shi,Hongyu Zhang,Chunsheng Li,Yujia Liu,Yu Wang,Liang Feng
Accurate and real-time detection of biogenic amines is vital for food safety, yet developing sensors that combine selectivity with environmental stability remains a challenge. Here, we report a new strategy using copper-integrated, self-assembled carbonized polymer dots (Cu-CPDs) to overcome these limitations. Here we introduce a novel strategy in which Cu 2+ active sites are precisely anchored within the self-assembled supramolecular framework of carbonized polymer dots (Cu-CPDs), yielding a robust colorimetric chemosensor. X-ray photoelectron spectroscopy and controlled experiments confirm that the sensing mechanism relies on specific Cu 2+ -NH 3 coordination chemisorption rather than non-specific physisorption, endowing the Cu-CPDs with exceptional selectivity towards amines. The sensor maintains stable performance at different temperatures and relative humidity up to 90%, delivering a rapid linear colorimetric response suitable for on-site spoilage monitoring of protein-rich foods. More importantly, this work also provides a generalizable sensor design paradigm that leverages the self-assembled CPDs matrix to host functional metal sites, addressing critical limitations in chemical sensing.
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DOI
高影响因子
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