RSC Advances
·
2015
·Vol. 5
·期 111
·91206-91212
·
IF 3.84
Wen Long Li,Hong Yan Zou,Jing Lan,Qiang Wang,Yuan Fang Li,Cheng Zhi Huang
Hollow nanostructures have been diversely applied in many fields and efforts have been made to develop their various synthesis methodologies. Herein, homogeneous hollow Cu2−xSeyS1−y/reduced graphene oxide (rGO) nanocomposites were prepared for the first time via a facile and green aqueous chemical approach using H2S gas bubble templates as soft templates at room temperature. It is found that 2D hexagonal Cu2−xSeyS1−y nanosheets assemble around the gas–liquid interface of H2S bubbles to form hollow nanospheres on the rGO sheets, wherein rGO sheets as molecular templates play a critical role in maintaining the structural integrity of single-crystal hollow Cu2−xSeyS1−y nanospheres. Increasing the S content in the precursors, i.e., increasing the amount of H2S bubbles, both the diameter and chalcogen composition (S/Se molar ratio) of hollow Cu2−xSeyS1−y/rGO nanocomposites gradually increase. The near-infrared (NIR) localized surface plasmon resonance (LSPR) in Cu2−xSeyS1−y/rGO nanocomposites, arising from the free carriers (holes) in Cu2−xSeyS1−y, gets red shifts with increasing the S content, due to the higher carrier mass and assembly degree of Cu2−xSeyS1−y.
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Nanoscale
·
2017
·Vol. 9
·期 29
·10335-10343
·
IF 7.367
Jiale Liu,Ye Tian,Zhennan Wu,Lin Ai,Yi Liu,Jianli Cui,Weili Yu,Hao Zhang,Bai Yang
Self-assembly and crystallization are two common methods to control the morphologies of nanomaterials, which have many similarities. In this work, chloride is used to direct the self-assembly process of Cu nanoclusters and the subsequent growth of Cu2−xS nanocrystals. Meaningfully, chloride both promotes the transformation of Cu nanocluster self-assembled architectures from one-dimensional (1D) to 2D, and facilitates the transformation of Cu2−xS nanocrystals from nanorods to nanosheets. Such an influence is attributed to the selective adsorption of chloride ions on the specific facets of nanoclusters and nanocrystals, which alters the inter-nanocluster weak interactions during self-assembly and suppresses the activity of Cu2−xS facets during nanocrystal growth. The current results indicate that the method used to direct the morphologies of nanocrystals is extendable to control the tendency of nanocluster self-assembly.
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Analytical Methods
·
2016
·Vol. 9
·期 2
·259-266
·
IF 1.915
Liyuan Qin,Lingjie Hou,Jia Feng,Jianbin Chao,Yu Wang,Wei Jun Jin
A new and simple julolidine based molecular receptor system L linked to 4-phenylsemicarbazide through an imine moiety has been synthesized and characterized. In HEPES-buffered MeOH–H2O (4 : 1, v/v, pH = 7.4) solution, L selectively binds Cu2+ to form a 1 : 1 ligand/metal complex, leading to a color change from green to yellow and significant fluorescence quenching at 540 nm. The in situ formed L–Cu2+ complex is further utilized to sense cyanide ions with high selectivity and fluorescence enhancement performance via metal displacement assay. The detection limit is 2.28 × 10−7 M and 1.33 × 10−8 M for Cu2+ and CN−, respectively. The sensor has been successfully applied to detect cyanide in water samples. The fluorescence imaging experiments in living cells were also demonstrated, which concludes that the sensor is capable of sensing Cu2+ and CN− in living cells.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Zhen Liu,Huajun Zhou,Simon S. Ang,Jian-Jun Zhang
Here we report the evaluation of natrochalcite (Na[Cu 2 (OH)(H 2 O)(SO 4 ) 2 ]), an anionic layered structure [Cu 2 (OH)(H 2 O)(SO 4 ) 2 ] − charge-balanced by Na + , as an anode material for both Li- and Na-ion batteries. It delivers 224 mAh/g and 175 mAh/g in the first discharge in the Li + - and Na + -cells respectively, and decomposes to form amorphous matrixes during this step. In the subsequent charge, the original layered structure is unusually partially recrystallized back from the matrixes, resulting in 53 mAh/g and 35 mAh/g discharge capacities in the second discharge respectively. In subsequent cycling, Li + in the electrolyte is found to replace the original Na + during cycling in the Li + -cell and the electrode in the Li + -cell demonstrates better capacity retention rates than that in the Na + -cell, possibly due to Li + being smaller than Na + and thus decomposition-recrystallization cycles being more reversible during cycling in the Li + -cell.
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Materials Express
·
2017
·Vol. 7
·期 5
·351-360
·
IF 2.062
Wang Jianying,Ma Xiaofei,Wei Lai,Dai Guangchao,Zhu Xiang,Zhu Yuhua,Mei Tao,Li Jinhua,Wang Xianbao
A novel fluorescent photonic crystal (FPC) film is created for the first time via self-assembly of a new kind of uniform fluorescent silica colloids. The fluorescent silica colloids have first been synthesized by combination of stöber method and direct calcination, which are then
used as building blocks for formation of FPC films with opal structure via vertical deposition method. The FPC films with brilliant structural colors could be obtained, depending on fluorescent silica colloids with various diameters. Importantly, the FPC films exhibit good fluorescent property,
e.g., emitting blue under 365 nm UV light. Moreover, the FPC films could be used as a sensor for highly sensitive detection of copper ions concentration via dual detection mode, fluorescence and reflection mode. The FPC films not only appear low detection of limit (DOL), but show good selectivity
for copper ions, various concentrations (from 1 nM to 100 μM) of copper ions could be precisely confirmed.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 21
·9625-9637
·
IF 2.302
Huang Qiang,Liu Meiying,Guo Ren,Mao Liucheng,Wan Qing,Zeng Guangjian,Huang Hongye,Deng Fengjie,Zhang Xiaoyong,Wei Yen
In this study, a facile surface functionalization method was applied to synthesize poly-levodopa (PDOPA)-modified silica nanocomposites (denoted as SiO 2 -PDOPA). The adsorption capacity of SiO 2 -PDOPA was found to be higher than that of unmodified SiO 2 NPs. The successful preparation of SiO 2 -PDOPA was confirmed by Fourier transform infrared spectroscopy, transmission electron microscopy, and thermo gravimetric analysis. The adsorption behavior was investigated using SiO 2 -PDOPA as adsorbents and Cu 2+ as a model heavy metal pollutant. Various adsorption parameters, including contact time, solution pH, temperature, and initial Cu 2+ concentrations were studied. The results showed that pH could markedly affect the adsorption process of SiO 2 -PDOPA to Cu 2+ . The optimum pH for Cu 2+ adsorption was found to be 7.0. The adsorption kinetic data were analyzed using pseudofirst-order, pseudosecond-order, and intraparticle diffusion
models. The adsorption isotherms could be described by Langmuir and Freundlich isotherm models. The fitting
results showed that the adsorption kinetics and isotherms were better
described by the pseudosecond-order and Langmuir model, respectively. The values of thermodynamics constants, including entropy change (Δ S
0 ), enthalpy change (Δ H
0 ), and Gibbs free energy (Δ G
0 ) were determined at different temperatures. Results suggested that the adsorption
process of SiO 2 -PDOPA to Cu 2+ is a feasible, endothermic, and spontaneous process.
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ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Yulong Wang,Zhenhe Su,Limin Wang,Jinbo Dong,Juanjuan Xue,Jiao Yu,Yuan Wang,Xiude Hua,Minghua Wang,Cunzheng Zhang,Fengquan Liu
We have developed a rapid and ultrasensitive surface-enhanced Raman scattering (SERS) assay for Cu2+ detection using the multiple antibiotic resistance regulator (MarR) as specific bridging molecules in a SERS hot-spot model. In the assay, Cu2+ induces formation of MarR tetramers, which provide Au nanoparticle (NP)–AuNP bridges, resulting in the formation of SERS hot spots. 4-Mercaptobenzoic acid (4-MBA) was used as a Raman reporter. The addition of Cu2+ increased the Raman intensity of 4-MBA. Use of a dual hot-spot signal-amplification strategy based on AuNP–AgNP heterodimers combined through antigen–antibody reactions increased the sensitivity of the sensing platform by 50-fold. The proposed method gave a linear response for Cu2+ detection in the range of 0.5–1000 nM, with a detection limit of 0.18 nM, which is 5 orders of magnitude lower than the U.S. Environmental Protection Agency limit for Cu2+ in drinking water (20 μM). In addition, all analyses can be completed in less than 15 min. The high sensitivity, high specificity, and rapid detection capacity of the SERS assay therefore provide a combined advantage over current assays.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Qian Long,Hanfeng Cui,Jing Zhang,Qiqi Fan,Ting Huang,Hai Shuai,Xiaocui Yin,Guobing Wei,Huanwen Chen,Hao Fan
Cu 2+ serves as a significant biomarker in various physiological processes. This study presents the development of a novel Ru-UiO-TPEA functionalized metal-organic framework (MOFs) probe for Cu 2+ detection, employing both electrochemiluminescence (ECL) and electrochemical (EC) methods. Employing a dual ligand-assisted energy transfer approach, we synthesized Ru-UiO with optimal ECL and EC properties by adjusting the synthesis ratio of biphenyldicarboxylic acid to Ru(dcbpy) 3 2+ . This was followed by its conjugation with N-(2-aminoethyl)-N, N′, N′-tris(pyridin-2-ylmethyl) ethane-1,2-diamine (AE-TPEA) to form the highly conjugated Ru-UiO-TPEA probe for Cu 2+ detection. As the Cu 2+ concentration increased, the probe exhibited a diminished ECL signal and an enhanced differential pulse voltammetry (DPV) signal. The dual-mode detection method enabled cross-validation of the ECL and EC signals, enhancing accuracy and effectively minimizing errors. The ECL and EC methods had detection limits of 0.26 nM (range: 1 nM to 10 μM) and 0.65 nM (range: 2 nM to 80 μM), respectively. Meanwhile, these two methods can effectively detect Cu 2+ in rat brain microdialysis fluid. Notably, the measured concentrations correlated well with those determined by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES), highlighting its potential in biological and clinical bioelectronic sensing applications.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 7
·1-13
·
IF 5.3
Li Ziqiang,Liang Shuang,Zhang Changsheng,Zhou Li,Luo Fengjian,Lou Zhengyun,Chen Zongmao,Zhang Xinzhong,Yang Mei
A ratiometric fluorescence sensing strategy has been developed for the determination of Cu 2+ and glyphosate with high sensitivity and specificity based on OPD (o-phenylenediamine) and glutathione-stabilized gold nanoclusters (GSH-AuNCs). Water-soluble 1.75-nm size GSH-AuNCs with strong red fluorescence and maximum emission wavelength at 682 nm were synthesized using GSH as the template. OPD was oxidized by Cu 2+ , which produced the bright yellow fluorescence oxidation product 2,3-diaminophenazine (DAP) with a maximum fluorescence emission peak at 570 nm. When glyphosate existed in the system, the chelation between glyphosate and Cu 2+ hindered the formation of DAP and reduced the fluorescence intensity of the system at the wavelength of 570 nm. Meanwhile, the fluorescence intensity at the wavelength of 682 nm remained basically stable. It exhibited a good linear relationship towards Cu 2+ and glyphosate in water in the range 1.0–10 µM and 0.050–3.0 µg/mL with a detection limit of 0.547 µM and 0.0028 µg/mL, respectively. The method was also used for the semi-quantitative determination of Cu 2+ and glyphosate in water by fluorescence color changes visually detected by the naked eyes in the range 1.0–10 µM and 0.30–3.0 µg/mL, respectively. The sensing strategy showed higher sensitivity, more obvious color changes, and better disturbance performance, satisfying with the detection demands of Cu 2+ and glyphosate in environmental water samples. The study provides a reliable detection strategy in the environment safety fields. Graphical abstract
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Ji Qi,Bowei Li,Xinran Wang,Zhong Zhang,Zhuo Wang,Jinglong Han,Lingxin Chen
In this study, a novel three-dimensional (3D) origami ion imprinted polymers microfluidic paper-based chip device for specific, sensitive and multiplexed detection of Cu 2+ and Hg 2+ ions has been proposed. In this device, the surface of the paper was activated by grafting with CdTe QDs through amino processing and formation of Cu 2+ or Hg 2+ IIPs and CdTe QDs complex that led to fluorescence quenching of QDs because the photo luminescent energy of QDs could be delivered to the complex. This method can realize the liquid phase of QDs@IIPs being transferred to the solid glass fiber paper and improve the portability of the device. Moreover, this platform allows to simultaneous detection of Cu 2+ and Hg 2+ ions with good selectivity and sensitivity. The proposed method reveals that the copper ion imprinted fluorescent sensor demonstrated a good linearity from 0.11 to 58.0 μg/L with the detection limit of 0.035 μg/L and the mercury ion linear range is 0.26–34.0 μg/L with detection limit of 0.056 μg/L. Importantly, this device can provide quantitative information conveniently and show great potential to be further extended to the detection of other metal ions for environmental monitoring and food safety field.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zelai Cheng,Xingyu Huo,Zhen Zhao,Feng Qiao,Xiuling Yang,Ying Chen,Mingshan Qu,Hua Su
This work presents a miniaturization strategy for ferrite circulators by enhancing the dielectric constant ε r of NiCuZn ferrites and LTCC technology. Highly polarizable Cu 2+ and Ti 4+ substitutions for Ni 2+ and Fe 3+ increase dielectric constant, while non-magnetic Ti 4+ reduces magnetocrystalline anisotropy and narrows ferromagnetic resonance linewidth ΔH , with Cu 2+ concurrently lowering sintering temperatures. In the Ni 0.42-x/2 Cu 0.18+x Zn 0.4 Ti x/2 Fe 1.98-x O 4-δ system, the x = 0.1 composition (sintered at 975 °C) achieves minimal ΔH (82 Oe), ε r ≈ 14.6, and 4π M s ≈ 4219 G, whereas x = 0.6 (sintered at 925 °C) balances ε r ≈ 20.8 with magnetic performance ( ΔH ≈167 Oe, 4π M s ≈ 2117 G), confirming LTCC compatibility. A heterostructured substrate fabricated by co-firing Ni 0.12 Cu 0.78 Zn 0.4 Ti 0.3 Fe 1.38 O 4-δ ferrite (x = 0.6) with a microwave dielectric (50 wt.% SrCu 0.95 Mn 0.05 Si 4 O 10 + 50 wt.% Sr 3 V 2 O 8 ) exhibits controlled interfacial diffusion. HFSS simulations demonstrate that the integrated circulator-filter achieves significant miniaturization with >30 dB harmonic suppression (14-24 GHz) while maintaining in-band performance (| S 21 | < 1 dB, | S 11 | and | S 12 | < -20 dB at 7-12 GHz). The validates high- ε r NiCuZn ferrites and LTCC composite substrates for compact multifunctional microwave components.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Hongman Sun,Yuanyuan Wen,Yaqian Li,Rong Fan,Yonglian Lu,Chao Feng,Hao Liu,Youhe Wang,Zhipeng Ma,Yu Zhang,Rose Amal,Zifeng Yan
Ag@Cu 2 O tandem catalysts is effective to improve the selectivity of hydrocarbons in CO 2 RR, where Ag core generates *CO intermediates, which migrate to Cu 2+ /Cu + interface, promoting proton transfer and C-C coupling forming *OCCHO. However, Cu + crucial for C-C coupling exhibits instability under reductive conditions. Herein, we used Ag@Cu 2 O tandem catalysts as a sacrificial template to synthesize Ag@Cu 2 O@Cu-BDC (BDC = 1,4-benzenedicarboxylic acid) tandem catalysts through an in-situ conversion strategy, which can not only introduce Cu 2+ , but also stabilize Cu + by forming a Cu-BDC MOF shell. In addition, by adjusting the amount of sacrificial template, the controllable regulation of Cu 2+ and Cu + content was successfully achieved, forming a Cu 2+ /Cu + valence state fluctuation buffer zone. It is found that this modulation not only significantly improve the selectivity towards hydrocarbons (CH 4 +C 2 H 4 ), but also enables the regulation of the reaction pathway, thereby allowing for fine-tuning of product selectivity. Notably, the Ag@Cu 2 O@Cu-BDC-5 tandem catalyst with a lower Cu 2+ /Cu + ratio demonstrated superior CH 4 selectivity (59.3 %), while the Ag@Cu 2 O@Cu-BDC-10 tandem catalyst with a higher Cu 2 ⁺/Cu + ratio achieved dominant C 2 H 4 production (43.0 %) under applied potential of −1.4 V vs. RHE for 20 h. This is attributed to Cu 2+ sites facilitated *CHO generation, while Cu + sites promoted C-C coupling as evidenced by the in-situ infrared and DFT calculations. Additionally, this study demonstrated the existence of a tandem catalysts that could increase the CO coverage on Cu sites, ensuring the full utilization of Cu + and Cu 2+ sites to further enhance product selectivity and reduce the overpotential for optimal product generation.
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