查找使用阿拉丁产品的科研文献

Investigation of the Na Storage Property of One-Dimensional Cu2–xSe Nanorods

He Li,Jiali Jiang,Jianxing Huang,Yunhui Wang,Yueying Peng,Yiyong Zhang,Bing-Joe Hwang,Jinbao Zhao

In this study, one-dimensional Cu2–xSe nanorods synthesized by a simple water evaporation-induced self-assembly approach are served as the anode material for Na-ion batteries for the first time. Cu2–xSe electrodes express outstanding electrochemical properties. The initial discharge capacity is 149.3 mA h g–1 at a current density of 100 mA g–1, and the discharge capacity can remain at 106.2 mA h g–1 after 400 cycles. Even at a high current density of 2000 mA g–1, the discharge capacity of the Cu2–xSe electrode still remains at 62.8 mA h g–1, showing excellent rate performance. Owing to the excellent electronic conductivity and one-dimensional structure of Cu2–xSe, the Cu2–xSe electrodes manifest fast Na+ ion diffusion rate. Moreover, detailed Na+ insertion/extraction mechanism is further investigated by ex situ measurements and theoretical calculations.

Facile preparation of polyethylenimine-tannins coated SiO2 hybrid materials for Cu2+ removal

Qiang Huang,Meiying Liu,Jiao Zhao,Junyu Chen,Guangjian Zeng,Hongye Huang,Jianwen Tian,Yuanqing Wen,Xiaoyong Zhang,Yen Wei

Polyethylenimine-tannins coated SiO 2 (SiO 2 @PEI-TA) hybrid materials have been prepared via a single-step multifunctional coating with polyethylenimine (PEI) and tannins (TA), and characterized by transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The as-prepared SiO 2 @PEI-TA composites were examined as adsorbents to remove the Cu 2+ from aqueous solution. The effects of contact time, initial Cu 2+ concentration, solution pH and temperature, on Cu 2+ adsorption have been investigated. The results show that the adsorption of Cu 2+ onto SiO 2 @PEI-TA is dependent on the contact time, Cu 2+ concentration, pH and temperature. The SiO 2 @PEI-TA composites show a 2.4-fold increase in adsorption capacity, implying that the introduction of PEI-TA coating is in favor of the Cu 2+ adsorption. Based on the analysis of kinetic data, the kinetics of Cu 2+ adsorption is more accurately described by the pseudo-second-order model. The equilibrium data are analyzed by Langmuir and Freundlich isotherms. Results of isotherms show that the better agreement is Freundlich isotherm model with correlation coefficient of 0.9914, which suggests that the adsorption of Cu 2+ onto SiO 2 @PEI-TA is mainly a heterogeneous adsorption process. Thermodynamic analyses show that the adsorption interaction is actually a spontaneous and endothermic chemical process, which might involve the chemical chelation between Cu 2+ and functional groups (amine and carboxyl groups) on the surface of SiO 2 @PEI-TA. In addition, the Cu 2+ ions could desorb from SiO 2 @PEI-TA by using acid solution and the adsorption efficiency remains at high level after five adsorption-desorption recycles. These results provide potential applications of these novel adsorbents for the removal of heavy metal Cu 2+ from aqueous solution and also provide strong evidence to support the adsorption mechanism proposed in the study.

Facile preparation of Cu2-xS supernanoparticles with an unambiguous SERS enhancement mechanism

Jun Zhang,Tingyang Xing,Min Zhang,Yunlong Zhou

Surface-enhanced Raman scattering (SERS) techniques benefit from the development of various substrates ranging from noble metal to semiconductor materials. Semiconductor substrates have been assumed to construct more specific structures and designable surface chemistry than noble metal substrates. Therefore, the development of semiconductor substrates may lead to the selective recognition of target molecules, more stable SERS spectra, and even low-cost fabrication of SERS substrates. In this paper, we disclose semiconductor supernanoparticles formed by a self-limiting assembly process with stable properties, easy scale-up fabrication, and high SERS enhancement. The detected concentration of analytes reaches as low as 10 −8  M. The built-in hotspots and self-doping in suprananoparticles provide strong electromagnetic enhancement, and the molecular resonance and charge transfer with the target molecule contribute to chemical enhancement. Discrete dipole approximation simulation was used to further confirm the SERS enhancement mechanism. Cu 2-x S supernanoparticles paved a new way to construct novel semiconductors with SERS activity.

Multiple effects of polydopamine nanoparticles on Cu2+-mediated Alzheimer's β-amyloid aggregation

Xueqing Chen,Weiqun Gao,Yan Sun,Xiaoyan Dong

Deposition of β-amyloid protein (Aβ) is the main hallmark of Alzheimer's disease (AD), and it has been well recognized that Cu 2+ -mediated Aβ aggregation plays a crucial role in AD pathological processes. Cu 2+ binding to Aβ can promote the production of reactive oxygen species (ROS) through Fenton-like reactions and produce more toxic Aβ-Cu 2+ species under Cu 2+ stimulation. Thus, the development of nanomaterials that can inhibit Cu 2+ -mediated Aβ aggregation and degrade Aβ-Cu 2+ complexes is considered an effective strategy for the prevention and treatment of AD. In this study, polydopamine nanoparticles (PDA NPs) were prepared and the results reveal that PDA NPs potently inhibit Cu 2+ -mediated Aβ aggregation and effectively reduce the formation of Aβ-Cu 2+ complexes. In vitro experiments show that PDA NPs efficiently eliminate ROS generation catalyzed by Cu 2+ or Aβ-Cu 2+ complexes, thus rescuing cultured cells by reducing intracellular ROS levels. More importantly, PDA NPs can depolymerize Aβ-Cu 2+ complexes, and the degradation of Aβ-Cu 2+ complexes is promoted by near-infrared light irradiation due to their high photothermal conversion ability. In vivo studies reveal that PDA NPs significantly reduce the deposition of Aβ plaques in the presence of Cu 2+ and extend the lifespan of AD nematodes from 11 to 14 d. Thus, the PDA NPs developed herein are multifunctional against Cu 2+ -mediated Aβ aggregation for the potential prevention and treatment of AD.

[Bmim]FeCl4 Efficient Catalytic Oxidative Removal of H2S by Cu2+ Synergistic Reinforcement

Kui Qiu,Zhihao Liu,Yu Dong,Luwei Liu,Weijun Li,Shihao Niu,Zhaobo Jin

An iron/copper bimetallic catalytic oxidation desulfurization system was constituted by adding N -methyl pyrrolidone (NMP) and CuCl 2 aqueous solution to an iron-based ionic liquid (Fe-IL) for the removal of hydrogen sulfide from industrial gas streams. The desulfurizer and its sulfur products were characterized using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Static desulfurization experiments were conducted to investigate the absorption pattern of the system for H 2 S. The addition of NMP and water effectively reduced the acidity and viscosity of the system and improved the gas-liquid mass transfer efficiency. The introduction of CuCl 2 increased the oxidation potential of the solution and enabled Fe 3+ to efficiently catalyze the oxidation of H 2 S to produce monomeric S. The synergistic catalytic oxidation between Fe 3+ /Cu 2+ is the main reason why the system can maintain a high degree of purification over a long period.

β-Cyclodextrin/CMK-8-Based Electrochemical Sensor for Sensitive Detection of Cu2+

Chengqi Bao,Yan Lu,Jiawei Liu,Yansha Gao,Limin Lu,Shuwu Liu

In this work, β-cyclodextrin (β-CD)/mesoporous carbon (CMK-8) nanocomposite was synthesized and used as an electrochemical sensing platform for highly sensitive and selective detection of Cu2+. The morphology and structure of β-CD/CMK-8 were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). In addition, the dates from electrochemical impedance spectroscopy (EIS) and Cyclic voltammetry (CV) demonstrated that the β-CD/CMK-8 possessed a fast electronic transfer rate and large effective surface area. Besides this, the β-CD/CMK-8 composite displayed high enrichment ability toward Cu2+. As a result of these impressive features, the β-CD/CMK-8 modified electrode provided a wide linear response ranging from 0.1 ng·L−1to 1.0 mg·L−1with a low detection limit of 0.3 ng·L−1. Furthermore, the repeatability, reproducibility and selectivity of β-CD/CMK-8 towards Cu2+were commendable. The sensor could be used to detect Cu2+in real samples. All in all, this work proposes a simple and sensitive method for Cu2+detection, which provides a reference for the subsequent detection of HMIs.Keywords:copper ion;β-cyclodextrin;mesoporous carbon;electrochemical sensor

Synthesis of hybrid Au-Ag2S-Cu2-xS nanocrystals with disparate interfacial features

Yongli Cao,Song Li,Xiaodi Yu,Wenhua Li,Zhishan Bo

Hybrid nanocrystals (NCs) with multiple components and junctions have attracted considerable attention due to their promising synergistic properties. In particular, great attention has been paid to the manipulation of buried multijunction heterointerfaces because they are closely related to the surface energy and carrier transfer of NCs. However, heterointerfaced NCs are usually constructed by sequential step-by-step pathways, and buried interfaces can only be formed along a given direction, resulting in the one and only spatial orientation of multiple interfaces. In this work, we demonstrate two types of Au-Ag 2 S-Cu 2-x S NCs with disparate interfacial features. Specifically, the first type (Type I) is prepared through a routine two-step method and shows that Au domain close to the Ag 2 S-Cu 2-x S interface; another type (Type II) is achieved by a facile one-pot synthesis procedure and contains Au domain with an interphase only with the Ag 2 S domain, far from the Cu 2-x S domain. More importantly, type II NCs could not be formed through other traditional strategies and an underlying mechanism of formation is developed by monitoring the evolution process. Au@Ag core–shell NCs, metastable Au@Ag 2 S NCs and Janus Au-Ag 2 S NCs are formed successively before the Cu 2-x S domain appears. We speculate that the Au@Ag 2 S intermediate plays an essential role in building the final complex nanostructure . We expect that such a simple and facile one-pot method will be used to fabricate additional asymmetric multicomponent NCs with distinctive interfacial features and promising potential applications.

Near infrared-response ratiometric fluorescence sensor for the sensitive detection of Cu2+

Min Yang,Enzhou Liu,Xiaoyun Hu,Hong Hao,Jun Fan

The design of novel Cu 2+ quantitative sensors with highly sensitivity and selectivity is a hot topic of modern chemistry . Herein, a novel ratiometric fluorescence (PL) sensor based on the red-emitting CdTeS quantum dots (QDs) and blue-emitting polyethyleneimine-functionalized carbon dots (PEI-CDs) was firstly designed for sensing Cu 2+ . In the presence of Cu 2+ , a good linear relationship between the ratios (F 520 /F 690 ) of the two peak intensities and the concentrations of Cu 2+ was observed in the range of 0.01–250 µM with the correlation coefficient (R 2 ) of 0.993 and the detection limit as low as 8.07 nM. The ratiometric nanosensor was also used to successfully determine Cu 2+ in plasma samples with satisfactory results obtained. Therefore, we hold the opinion that the developed ratiometric fluorescent sensor based on CdTeS QDs/PEI-CDs will provide technical support for the point-of-caretesting of Cu 2+ .

Liquid photonic crystal detection reagent for reliable sensing of Cu2+ in water

Yixin Zhang,Jianping Ge

A traditional hydrogel photonic crystal sensor is prepared by multiple steps, including colloidal assembly, polymerization, and recognition group modification, and its measurement repeatability is a challenge due to the inevitable deviations in sensor fabrication and application. In this work, a salicylic acid-containing “SiO2/propylene carbonate” liquid photonic crystal (Sal-LPC), as a new photonic sensing material, was developed to demonstrate reliable measurement of Cu2+ in water. When the Sal-LPC reagent was mixed with the test sample, the Cu2+ promoted the release of H+ from Sal and shrank the photonic crystal lattice, so that the Cu2+ concentration could be determined by the reflection blueshift of liquid PC. The Sal-LPC reagent showed a stronger response to Cu2+ than to other cations, and its sensitivity and measurement range could be optimized by the particle fraction and Sal dosage. Compared to traditional PC hydrogel sensors, the liquid PC reagent was composed of colloidal particles and responsive species, which required no strict control in synthesis. More importantly, the optical response of the liquid PC reagent was scarcely affected by changes in synthesis, storage, or application, and it could interact with the analyte quickly and quantitatively, which ensured accurate and repeatable measurement in either chemical analysis or environmental monitoring.

Rh6G-HS-Based Optofluidic Laser Sensor for Selective Detection of Cu2+ Ions

Li-Peng Sun,Zhen Sun,Zhenru Li,Yan Huang,Wenfu Lin,Runjia Liu,Wei Wang,Jie Li,Bai-Ou Guan

BCNO nanoparticles: A novel highly efficient fluorosensor for ultrarapid detection of Cu2+

Qian Liu,Ping Jiang,Zonghua Pu,Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Xuping Sun

In this paper, we demonstrate the first use of BCNO nanoparticles (BCNO NPs) as a novel highly efficient fluorosensor for Cu 2+ detection with high selectivity. The detection process is ultrafast and can be completed within 2   min, and the detection limit is 0.1   μM. We also show the practical use of this sensor for Cu 2+ determination in real water samples.

Highly sensitive and selective chemosensor for Cu2+ based on a Schiff base

Cao Ben-nan,Hu Qin,Huang Yan,Jia Chun-man,Zhang Qi

A new chemosensor based on a Schiff base has been designed and synthesized. Its sensing behavior toward various metal ions was investigated by fluorescence and UV-Vis spectroscopic methods. The fluorescence of the sensor was quenched and the color rapidly changed from canary yellow to brown after the addition of Cu 2+ , while no changes occurred after the addition of other metal ions, which contributes to the detection of Cu 2+ with naked eyes. The fluorescence quantum yield of the ligand was calculated to be 0.52. The corresponding detection limit of Cu 2+ was 5.721×10 −7 mol/L, and the 1:1 binding mode of the sensor with Cu 2+ was revealed by Job’s plot.