PHYSICA B-CONDENSED MATTER
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2023
·
IF 2.8
Jiafeng Chen,Jingying Si,Yifeng Zhang,Yanhong Chen,Rongrong Jia,Shixun Cao,Zhenjie Feng
NbTe 2 is a monoclinic quasi-two-dimensional layered semimetal . This paper reports the change of physical properties of NbTe 2 single crystals under the action of copper substitution. The zero-field ab -plane resistivity ρ xx shows that the samples havegood metallicity . Magnetoresistance changes of up to 23% were observed at a magnetic field of 13 T without any tendency to saturate. We have observed linear magnetoresistance under high magnetic field, which will be attributed to the linear band dispersion of small Fermi pockets. And we use a formula to describe the linear relationship: ρ = N i B π n 2 e c ∝ B . The curve of the Hall resistance changing with the magnetic field at the same temperature has a linear relationship with the magnetic field, and the slope is positive, which indicates that the carrier type is mainly hole-type carriers.
研究领域:
凝聚态物理
·
材料科学
·
电子输运
·
半金属
·
二维材料
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Materials Today Communications
·
2023
·
IF 3.8
Xiaohong Gao,Yizheng Wang,Feibo Li,Huixia Feng,Yanming Wang,Hongwei Che,Xiaoliang Zhang
In this study, a series of graphitic carbon nitride (g-C 3 N 4 ) decorated with Cu nanoparticle hybrids (CNx/Cuy) were prepared by one pot calcination method. The chemical composition of hybrids were determined by XRD, FTIR and XPS analysis . And the synthesized CNx/Cuy hybrid presented different morphologies with the different x/y ration. Then CNx/Cuy were added to liquid paraffin as lubricant additive , and the tribological properties of lubricant oils for steel/steel friction pairs were evaluated using a ball-on-disk tribometer. The results showed that friction processes lubricated with oil containing CN3/Cu1 shows better tribological properties. And oil containing 0.2 wt % CN3/Cu1 could achieve 57.3 % and 53.8 % reduction in the friction coefficient, respectively, compared to pure liquid paraffin and liquid paraffin containing pure g-C 3 N 4 . Based on the analysis of the worn surface topography and chemical composition, the excellent lubrication performance resulted from the formation of tribochemistry-induced tribo-film. The average thickness of tribo-film was about 100 nm, and it was composed of carbonization resulting from g-C 3 N 4 , Cu, Fe and self-lubricating Fe 2 O 3 . The formation of Fe 2 O 3 and carbonization in the tribo-film indicating the interaction between CN3/Cu1 with steel surfaces enhanced the stability and strength of tribo-film. Thereby the metal surface was further protected from friction and wear.
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Biosensors-Basel
·
2023
·Vol. 13
·期 8
·827
·
IF 5.4
Meixuan Liu,Chen Yan,Qianyun Ye,Xiaohuan Sun,Jie Han
Glutathione (GSH) is the most abundant low-molecular-weight biological thiol in vivo and has been linked to several diseases. The accurate quantification of GSH is therefore crucial for disease diagnosis and monitoring. In this study, we prepared self-assembled Cu(I)-Cys (cysteine) nanozymes through a two-step procedure. The Cu(I)-Cys nanoparticles exhibited peroxidase-mimicking activity. Upon the addition of H2O2, they were able to oxidize 3,3,5,5-tetramethylbenzidine (TMB) into oxTMB, resulting in a measurable increase in UV-Vis absorption at 655 nm. However, in the presence of GSH, oxTMB was reduced back to TMB, leading to a decrease in UV-Vis absorption at 655 nm. By utilizing these changes in the absorption intensity, we achieved the sensitive detection of GSH with a detection limit of 2.13 μM. Moreover, taking advantage of the different peroxidase-mimicking activities of Cu(I)-Cys nanoparticles at various pH values, a sensor array with Cu(I)-Cys nanoparticles at pH 4 and pH 5 was constructed. The discrimination of GSH among Cys and ascorbic acid was achieved and the practicability of the sensor array in human serum was validated. This novel approach holds significant promise for the precise discrimination and quantification of GSH and its potential applications in disease diagnosis and therapeutics.Keywords:nanozyme;GSH quantification;GSH discrimination
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Peng Huang,Nan Li,Liang Zeng,Yujie Zhu
The long-term goal of electrochemical ammonia (NH3) synthesis under ambient conditions is to replace the Haber–Bosch process. One of the biggest challenges in this field is that the N≡N triple bond is too stable to be activated. Therefore, most research is mainly focused on the development of advanced electrocatalysts to address this challenge. However, the extremely low solubility and slow diffusion of N2 molecules in aqueous electrolytes are usually overlooked. Here, the Bi-loaded Cu hollow microtube with a porous structure is reported as the gas diffusion electrode for N2 electroreduction. Compared with the conventional planar electrode configurations, the hollow gas diffusion electrode (HGDE) possesses unique advantages in breaking through the mass transfer limit of low-solubility gases. It can also provide abundant electrochemically active sites due to its porous structure, forming a gas–liquid–solid three-phase interface that is conducive to electrocatalytic reactions. Besides, the adjustable N2/H3O+ at the three-phase interface can further help enhance the reaction activity and selectivity. As a result, the Bi-loaded Cu HGDE exhibits an NH3 yield of 4.6 μg h–1 cm–2 and a Faradaic efficiency of 5.8% at −0.4 V (vs RHE, reversible hydrogen electrode). This study may stimulate interest in optimizing the electrode structure and developing types of electrodes for efficient electrochemical ammonia synthesis.
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CARBON
·
2022
·
IF 11.307
Jing Chen,Ying Chen,Shuying Li,Jiao Yang,Jianbin Dong,Xiaoquan Lu
Tyrosine is the precursor of some neurotransmitters such as thyroxine and dopamine. It has the effect of regulating emotions and stimulating the nervous system. Changes in tyrosine levels in the human body are associated with certain diseases. Therefore, it is very necessary to prepare a new type of tyrosine sensor. In this work, an enzyme-free electrochemical sensor based on MXene/CNTs/CuMOF composite was developed for the detection of tyrosine. Embedding carbon nanotubes (CNTs) into MXene effectively prevented the aggregation of MXene sheets. Further modification of MXene/CNTs materials with CuMOF octahedral particles with porous structure can improve the porosity and catalytic capability of the composites. Under the optimal detection conditions, the prepared sensor has good linearity in the detection of tyrosine within range 0.53 μM–232.46 μM with a limit of detection (LOD) of 0.19 μM. The stability and selectivity of the sensor is high, and can be used to detect tyrosine in human serum.
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Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-13
·
IF 16.419
Xie Shiyin,Li Yang,Li Xu,Zhou Yujun,Dang Ziqi,Rong Jianhua,Dong Liubing
Zn-based electrochemical energy storage (EES) systems have received tremendous attention in recent years, but their zinc anodes are seriously plagued by the issues of zinc dendrite and side reactions (e.g., corrosion and hydrogen evolution). Herein, we report a novel strategy of employing zincophilic Cu nanowire networks to stabilize zinc anodes from multiple aspects. According to experimental results, COMSOL simulation and density functional theory calculations, the Cu nanowire networks covering on zinc anode surface not only homogenize the surface electric field and Zn 2+ concentration field, but also inhibit side reactions through their hydrophobic feature. Meanwhile, facets and edge sites of the Cu nanowires, especially the latter ones, are revealed to be highly zincophilic to induce uniform zinc nucleation/deposition. Consequently, the Cu nanowire networks-protected zinc anodes exhibit an ultralong cycle life of over 2800 h and also can continuously operate for hundreds of hours even at very large charge/discharge currents and areal capacities (e.g., 10 mA cm −2 and 5 mAh cm −2 ), remarkably superior to bare zinc anodes and most of currently reported zinc anodes, thereby enabling Zn-based EES devices to possess high capacity, 16,000-cycle lifespan and rapid charge/discharge ability. This work provides new thoughts to realize long-life and high-rate zinc anodes.
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CHEMICAL PAPERS
·
2019
·Vol. 74
·期 6
·1831-1838
·
IF 1.246
Cai Zhifeng,Zhang Caifeng,Jia Kang
A fast, simple, green and low-cost synthesis method in aqueous solution was successfully established for the preparation of l -tyrosine protected Cu nanoclusters (Cu NCs). Subsequently, the as-prepared Cu NCs was characterized by UV–vis absorption spectroscopy, fluorescence spectroscopy, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). It exhibited good water solubility, excellent photostability and high stability toward high concentration of sodium chloride. The Cu NCs revealed maximum excitation and emission peaks at 430 and 477 nm, respectively. Importantly, the Cu NCs showed a rapid response, a liner relation over the pH ranges from 5.02 to 11.92 and could be repeated for five consecutive cycles without fluorescence decay. Further, the as-prepared Cu NCs was applied for the determination of pH value in water samples. Simultaneously, all above features showed that l -tyrosine protected Cu NCs had great potential for sensing of pH in biological field.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
·
IF 3.453
Hai-Xin Qi,Shang-Ru Zhai,Zhen-Zhen Wang,Bin Zhai,Qing-Da An
Adsorptive desulfurization (ADS) is an effective method for the selective capture of thiophenic sulfur compounds , and the ADS capacity of an adsorbent has been demonstrated to strongly depend on the dispersion degree of active species. Herein, series of zirconia-modified SBA-15 (ZrSBA-15) framework with uniformly dispersed Cu sites have been prepared via a urea-assisted homogeneous deposition strategy, aiming for efficient adsorption towards thiophene . The resultant materials were thoroughly characterized by X-ray diffraction (XRD), N 2 adsorption–desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance spectra (DRS) analysis techniques. It was revealed that the Cu species were highly dispersed inside the ordered ZrSBA-15 framework with platelet morphology, rather than aggregation outside the surface, leading to excellent adsorption capacity for thiophene (up to 9.35 mg/g at 50 °C). The adsorption kinetics and isotherm data can be well described by the pseudo-second-order kinetics model and the Langmuir isotherm, respectively. Spent adsorbent can be regenerated by simple heating treatment in N 2 at 500 °C, without obvious losing of thiophene adsorption capacity even after eight cycles.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2024
·Vol. 26
·期 7
·1-11
·
IF 2.1
Liang Mengfan,Zeng Guoan,Yang Shujie,Wei Xinyuan,Zhu Yan,Liu Jinkun
In this article, the effect of the surfactant on the interaction effect and structure stability of Cu–Ag nanoparticles (NPs) were studied by molecular dynamics (MD) simulation and experiment. The results showed that Ag NPs were coated around the surface of Cu NPs in Cu–Ag/surfactant system. However, the introduction of different surfactants resulted in a different interaction styles. With the surfactant from the consist of single structure (PVP or CTAB) to the consist of multiple structure (PVP&CTAB), the interaction energy between the surfactants and NPs increased rapidly. Meanwhile, the surfactant mixture promoted the interaction among NPs; also, it reduced the interaction between the NPs and external circumstance; the interface effect could be further controlled by adjusting the surfactant or their mixture.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yixuan Zhao,Jiahui Zhao,Shuqin Liu,Dunqing Wang,Jian Liu,Fei Zhang,Xiangshu Chen
Melamine (MA) enhanced Cu-Fenton process was developed for the degradation of anthracyclines. Taking daunorubicin (DNR) degradation as an example, we found that the initial first-order apparent constant of Cu 2+ /MA/H 2 O 2 system with a molar ratio of 1:8 for Cu 2+ :MA was 5.2 times higher than that of conventional Cu 2+ /H 2 O 2 system. The in-situ reductive coordination between Cu 2+ and MA facilitated the generation and stabilization of Cu + species, thereby accelerating the rate-limiting step of Cu 2+ /Cu + conversion and maintaining high levels of Cu + during the degradation process. Moreover, pre-synthesized Cu + -MA complexes ( e.g. , CM-250) further enhanced the efficiency of the Cu-Fenton reaction by increasing both the Cu + proportion and MA chelation. The apparent activation energy for DNR degradation in CM-250 mediated Fenton reaction (15.9 kJ mol −1 ) was lower than that in systems involving Cu 2+ /MA (41.2 kJ mol −1 ) and Cu 2+ (65.6 kJ mol −1 ). Enhanced generation of various reactive oxygen species (·OH,·O 2 - , and 1 O 2 ) was confirmed, with 1 O 2 playing a dominant role, significantly improving both degradation rate and mineralization degree for DNR. MA-enhanced Cu-Fenton process also offers a convenient alternative to effectively remove other anthracyclines and organic micropollutants, holding great promise for advancing advanced oxidation processes as well as practical large-scale degradation applications targeting multiple pollutants.
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IONICS
·
2024
·Vol. 30
·期 3
·1615-1625
·
IF 2.4
Dong Jinxiu,Cui Shichuang,Wang Fei,Wei Wei,Yin Ziluo,Zhang Yuqing,Zhu Quanyao
Electrochromism (EC) is a color control technique for providing visual information, in which vanadium pentoxide (V 2 O 5 ) is a promising material for electrochromic applications due to its excellent ionic intercalation/deintercalation properties and cathodic/anodic color-changing properties. However, its poor cycling stability and color change response rate limit its practical application. Metal–organic frameworks (MOFs) combine the rigidity and flexibility of inorganic–organic materials and can meet the requirements of EC materials such as cycle stability, electrical conductivity, and stress-interference resistance. We report here a strategy to modify V 2 O 5 with Cu-MOF. Cu-doped V 2 O 5 and carbon skeleton (Cu 2 V 2 O 7 @C) composites were prepared for electrochromism. In this scheme, Cu doping can facilitate lithium ion migration by broadening and stabilizing the structure of V 2 O 5 , and the distribution of the carbon skeleton can broaden the contact of the active material with the electrolyte and improve the electron conduction. Combining these merits, it exhibits excellent long-term cycle stability (the capacity retention rate reaches 91.78% after 2000 cycles), the light transmission modulation is greatly improved compared with V 2 O 5 (Δ T = 69%, doubled), and the response time is reduced by 30.43%. This study provides a new perspective for improving the light modulation ability and long-term use stability of vanadium oxide EC materials and promotes the development of MOF materials in the field of electrochromism.
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Journal of Nanotechnology
·
2025
·Vol. 2025
·期 1
·8879346
·
IF 4.1
Jingtao Zhang,Ruichun Nan,Yuheng Dong,Jing Yao,Tianzhu Liang,Ruoyu Li,Junyang Li,Pier Francesco Ferrari,Patrizia Perego,Bingkun Liu
In this work, copper-doped Fe 3 O 4 magnetic nanocomposites were synthesized via the solvothermal method. The synthesized catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, inductively coupled plasma mass spectrometry, and electron paramagnetic resonance. The performance of the catalysts in the Fenton-like reaction was evaluated through the analysis of their antibacterial activity in the presence of hydrogen peroxide. Electron paramagnetic resonance results indicated that • OH and • OOH, generated from hydrogen peroxide, were the primary active components in the reaction system. The Cu 2+ -Fe 3 O 4 nanocomposites showed stronger antibacterial activity towards Escherichia coli than Fe 3 O 4 , possibly due to the presence of Cu 2+ which accelerated the circulation between Fe 2+ and Fe 3+ ions and enhanced the utilization efficiency of hydrogen peroxide. Furthermore, inductively coupled plasma mass spectrometry analysis demonstrated that the concentration of released copper ions in aqueous solution remained within safe limits. Herein, we may provide a promising environmentally friendly catalyst for water disinfection treatment.
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