JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Jiatao Zhu,Shiliang Mei,Wu Yang,Guilin Zhang,Qiuhang Chen,Wanlu Zhang,Ruiqian Guo
In this work, transition metal ion- doped zinc-based quantum dots (QDs) are synthesized via a greener controllable method to avoid the toxicity of the traditional cadmium-based QDs and broaden the tunable emission. Herein, the tunable emission of Cu-doped ZnInS/ZnS core-shell QDs (Cu:ZnInS/ZnS) can cover from 500 to 620 nm by varying the Cu dopant concentration from 1 to 20% and the maximum quantum yield can reach 49.8%. Based on the single-doped QDs, Cu,Mn co-doped ZnInS/ZnS core-shell QDs (Cu,Mn:ZnInS/ZnS) with a photoluminance (PL) quantum yield of 30.4% are obtained. All the as-synthesized QDs have the zinc blende structure and the average size is about 3.55 nm. Besides, the interaction mechanism between the Cu and Mn dopant luminescence centers is proposed in this work, which is rarely investigated in the previous report. Diffusion priority and energy transfer between these two dopants are supposed to play an important role in the co-doped QDs and Cu ions could affect the splitting of Mn d states. Color coordinates of these doped QDs show the line-tunability from (0.200, 0.397) to (0.408, 0.508) on the Commission Internationale de L'Eclairage (CIE) chromatic diagram, showing a promising potential in high-quality white light output by integration of these QDs with blue chips.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jin Fang,Tao Ni,Minmin Mao,Yu Liu,Huan Liu,Lei Cao,Xueqing Yu,Bing Liu,Hadi Barzegar Bafrooei,Liang He,Yingjie Ren,Fayaz Hussain,Dawei Wang,Kaixin Song
MgSiO 3 ceramics with a low dielectric constant are highly promising for application in 5G communication due to their excellent performance and cost-effectiveness. However, the application remains constrained by phase transitions. This study aims to unlock their full potential by introducing Cu ions to mitigate phase transitions, thereby achieving stable and superior performance. Mg 1- x Cu x SiO 3 (0 ≤ x ≤ 0.25) ceramics were synthesized by solid-state method, and the effects of Cu introduction on the crystal structure, phase constitution, microstructure and microwave dielectric properties were systematically investigated. Through XRD patterns and Rietveld refinement , it was found that when x = 0, both protoenstatite (PEN) and low-temperature clinoenstatite (CEN) phases coexist due to a phase transition from PEN to CEN. As x increases, the PEN phase dominance rises while the CEN phase diminishes, indicating that the addition of Cu ions inhibits the occurrence of phase transition. At x ≥ 0.2, only the orthoenstatite (OEN) phase was observed. SEM and EDS analyses revealed the beneficial impact of Cu introduction on sintering, yet excessive amounts can lead to abnormal grain growth , local segregation, and uneven distribution of Cu elements, thereby deteriorating microwave dielectric properties . The optimal microwave dielectric performance was achieved at x = 0.05: ε r = 6.2, Qf = 93,600 GHz, τ f = −33.7 ppm/°C. A one-year long-term comparative study revealed the stabilizing effect of Cu incorporation for obtaining stable excellent performance. These findings underscore the potential of introducing an appropriate amount of Cu to achieve stable and superior microwave dielectric properties in MgSiO 3 ceramics, paving the way for practical applications in 5G communication.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Guangfei Qu,Qian Zhao,Ronglong Jian,Junya Wang,Dianxin Liu,Ping Ning
Beginning with the formation of the ionic liquid/water two-liquid phase catalytic system for absorption of PH 3 , we designed and synthesized Cu + -[Bmim]PF 6 , which has a hydrophobic property, and later formed a two-liquid phase system with Cu + -[Bmim]PF 6 and water, which has high PH 3 absorption efficiency, and an effective separation of the product and the catalyst was achieved. The effects of temperature and O 2 concentration on phosphine absorption, and the distribution of catalytic components and products in the ionic liquid/aqueous two-phase system were studied. Moreover, the mechanism of Cu + -ILs/water two-liquid phase catalytic oxidation of phosphine was discussed based on results from the analysis of FT-IR and ion chromatography . The results demonstrated that the optimum oxygen content in the reaction was 3%, and the optimum reaction temperature was 45 °C. Cu + -ILs/water two-liquid phase system has a high absorption efficiency for PH 3 , the absorption process is liquid phase catalytic oxidation and the product is H 3 PO 4 . The two-liquid phase system is semi-intelligent. The system can achieve high performance liquid phase catalytic oxidation of PH 3 , as well as automatic separation of H 3 PO 4 .
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 6
·期 1
·103-116
·
IF 6.482
Li Yu,Tiantian He,Jia Yao,Wendi Xu,Shuping Peng,Pei Feng,Cijun Shuai
Developing a novel antibacterial material with highly effective and long-lasting antibacterial activity to prevent bacterial infection during or post bone scaffold transplantation is an urgent need for bone regeneration. In this study, a synergistic antibacterial system for a polyglycolic acid (PGA) scaffold was constructed by cation exchange of montmorillonite (MMT) with Cu2+ and then intercalation of cetyltrimethylammonium bromide (CTAB) into the interlayer of MMT. On one hand, the introduced Cu2+ enlarged the interlayer spacing of MMT, facilitating the intercalation of CTAB into the MMT interlayer to impart the antibacterial effect. On the other hand, the intercalation of CTAB into MMT shifted the surface potential of MMT from negative to positive, improving the bacterial adsorption capacity by electrostatic forces so that Cu2+ could act directly on the negatively charged bacteria. As a result, the bacterial adsorption rate of Cu2+ and CTAB modified MMT (Cu-CMMT) improved by 76.5% compared with that of MMT, which could be explained by the increased zeta potential from −26.1 to 19.7 mV. Besides, the scaffold with Cu-CMMT exhibited robust antibacterial activities against E. coli with an antibacterial rate of 98.1%, which was significantly higher than that of the scaffold with Cu2+ or CTAB modified MMT individually. The scaffold with Cu-CMMT exhibited the highest level of reactive oxygen species (ROS), which was attributed to the dilapidation of bacterial cells.
研究领域:
材料科学
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生物医学工程
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微生物学
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产品关联
DOI
高影响因子
Energy & Environmental Science
·
2018
·Vol. 11
·期 7
·1848-1858
·
IF 30.067
Li You,Yefeng Liu,Xin Li,Pengfei Nan,Binghui Ge,Ying Jiang,Pengfei Luo,Shanshan Pan,Yanzhong Pei,Wenqing Zhang,G. Jeffrey Snyder,Jiong Yang,Jiye Zhang,Jun Luo
Here we find the peculiar behavior of Cu ions in the PbSe–Cu system increases its thermoelectric performance. For the electrical transport, a dynamic doping effect is achieved because more Cu ions enter into the PbSe lattice and provide extra charge carriers as the temperature increases, which guarantees an optimized carrier concentration over a wide temperature range. For the thermal transport, the presence of Cu2Se nanoprecipitates and dislocations at a low temperature range as well as the vibration of Cu atoms around the interstitial sites of PbSe at high temperatures result in hierarchical phonon scattering and a significantly reduced lattice thermal conductivity over the whole temperature range. As a result, a peak thermoelectric material figure of merit zT of up to 1.45 and a thermoelectric device figure of merit ZT close to unity are obtained for the sample with 0.375 at% Cu. Furthermore, enhanced thermoelectric properties are also realized for the Cu-intercalated PbS, implying that the temperature-driven dynamic behavior of Cu ions in a rigid lattice can serve as a general strategy to optimize the thermoelectric performance of IV–VI compounds.
研究领域:
材料科学
·
能源科学
·
物理学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiahua Zhong,Linghan Li,Chunyan Li,Xin Mu,Anni Cui,Guiye Shan
The development of cuprous oxide (Cu 2 O) photocathode for photoelectrochemical (PEC) water splitting confronts charge recombination and photocorrosion. Herein, a facile strategy for wrapping Cu 2 O photocathode with Cu ions intercalated graphene oxide (Cu-GO) was proposed to realize efficient PEC water splitting. The intercalating GO with Cu ions could reduce the bandgap and enhance the carrier mobility of Cu-GO. The as-formed Cu-GO could suppress surface charge recombination and accumulation of the Cu-GO/Cu 2 O photocathode by improving the interfacial charge transfer, which strengthens electron extraction and restrains photocorrosion. The Cu-GO/Cu 2 O photocathode achieved a high photocurrent density of − 7.03 mA cm −2 (at 0 V vs. RHE) under AM 1.5 G illumination and excellent photostability for PEC water splitting. This work provides a simple way to design Cu 2 O-based photocathodes with reliable charge transfer layers for efficient PEC water splitting.
研究领域:
材料科学
·
能源转换与储存
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 68
·期 4
·694-699
·
IF 2.352
Yu Cao,Jiayu Li,Jun Liu,Hongbo Liu,Yan Jiang,Hongwen Zhang
A novel ion-imprinted polymer (IIP) using (6- O -butene diacid ester)-β-cyclodextrin (β-CD-MAH) as the functional monomer and copper ions as the template was developed for Cu 2+ sensing. First, reactive β-cyclodextrin (β-CD) monomers with vinyl carboxylic acid functional groups were synthesised and were co-polymerised with styrene via radical polymerisation. Then, the β-CD copolymers were complexed with Cu 2+ in order to obtain the IIP. The imprinting effect was realised by removing the template ions from the imprinted polymer. The structure, composition and morphology of the IIP were characterised by Fourier transform IR spectroscopy, energy-dispersive spectroscopy and field-emission SEM. The adsorption capacity was investigated by UV–visible spectroscopy in batch operation mode. The maximum adsorption capacity for the Cu 2+ template ions was 28.91 mg g −1 , and the adsorption selectivity was clearly illustrated from the increased sorption affinity towards Cu 2+ ions over other competing ions. The adsorption was affected by the pH of the aqueous medium, and enhanced adsorption capacity was observed at pH 5. The prepared IIP could be used 10 times after its regeneration without significant loss of the adsorption capacity. © 2018 Society of Chemical Industry
研究领域:
材料科学
·
分析化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Fang Zhou,Yan Zhu,Longlai Yang,De-Quan Yang,Edward Sacher
Aqueous dispersions of AgCu nanoparticles (NPs), with enhanced antibacterial efficacy, have been prepared through the catalyzed reduction of Cu ions by PVP/PVA-stabilized Ag nanoparticles at 85 °C. The effects of Cu concentration and heating time on NP morphology and antibacterial efficacy were investigated, using TEM, UV-Vis and FTIR spectroscopies , and antibacterial evaluations. The enhanced antibacterial performance of these NPs was correlated with Ag ion release. We propose a simple model of AgCu NP formation, and an enhanced antibacterial efficacy mechanism involving Ag ion release, in which AgCu NPs formation plays a role to control of Ag ion release.
研究领域:
材料科学
·
微生物学
·
纳米医学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 34
·15932-15937
·
IF 7.233
Feng Wang,Jian Lin,Hongye Wang,Shansheng Yu,Xiaoqiang Cui,Asghar Ali,Tao Wu,Yang Liu
Herein, the ECL behaviors of precise mono-Cu+ ion doped Cd–In–S supertetrahedral chalcogenide nanoclusters (Cu@CdInS NCs) were investigated, and the effect of mono-Cu+ ions at the vacancy site of NCs on ECL emission performance was also elucidated. Precise mono-Cu+ ion doping not only induced new ECL emission at 596 nm with enhanced efficiency as high as 21.72% relative to [Ru(bpy)3]2+, but also improved acid tolerance of the ECL performances of NCs. In addition, a simple, fast and label-free dopamine ECL sensor with excellent selectivity was achieved.
研究领域:
分析化学
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2020
·
IF 10.257
Bingfang Wang,Yuanyuan Luo,Lei Gao,Bo Liu,Guotao Duan
Accurate detection of glucose is essential for the diagnosis of diabetes, wherein effective and sensitive biosensors for glucose detection are needed. Here, we fabricated a glucose sensor based on field-effect transistor (FET) with bimetallic nickel-copper metal-organic frameworks (Ni/Cu-MOFs) as its channel layers which were grown in-situ through a simple one-step hydrothermal method and modified with glucose oxidase (GOD) by using glutaraldehyde (GA) as linkers. Due to the synergistic effect of Ni ions and Cu ions in MOFs, the sensor (GOD-GA-Ni/Cu-MOFs-FET) showed good field effect performance and great responses to glucose through enzymatic reactions . It displayed a piecewise linear relationship in the wide range (1 μM–20 mM), and provided high sensitivity (26.05 μAcm −2 mM −1 ) in the low concentration (1–100 μM) and a low detection limit (0.51 μM). The sensor also had these advantages of high specificity, excellent reproducibility, good short-term stability and fast response time. Especially, it is indicated that the Ni/Cu-MOFs-FETs with high performance have the potential to be available sensors, paving the way for the application of bimetallic MOFs in biosensing.
研究领域:
生物传感器
·
材料科学
·
纳米技术
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）