RSC Advances
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2019
·Vol. 9
·期 61
·35524-35531
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IF 3.049
Xinyu Mao,Liqun Zhu,Huicong Liu,Haining Chen,Pengfei Ju,Weiping Li
Directly dispersing graphene into an electrolyte still remains a crucial difficulty in electrodepositing a graphene enhanced composite coating onto electrical contact materials. Herein, graphene was synthesized via electrochemical exfoliation in an N,N-dimethylformamide (DMF)/H2O solution containing (NH4)2SO4. The electrochemically exfoliated graphene nanosheets (GNs) were directly dispersed by sonication. In comparison with graphene synthesized from aqueous solution, the GNs electrochemically exfoliated in the DMF/H2O–(NH4)2SO4 solution exhibit a lower degree of oxidation. Cu/graphene composite coatings were subsequently electrodeposited onto Cu foils by adding Cu2+ into the as-fabricated graphene solution. The surface nanostructure of the Cu/graphene composite coatings was transformed from loose pine needles to a uniform and compact structure with an increase in the concentration of Cu2+, which indicated that the controllable synthesis of Cu/graphene composite coatings with different performances could be achieved in graphene dispersions after adding Cu2+. In order to synthesize graphene via electrochemical exfoliation and directly electrodeposit a Cu/graphene composite coating without adding CuSO4 or any other additive, an attempt was made to directly electrodeposit a Cu/graphene composite coating in CuSO4/DMF/H2O solution after electrochemical exfoliation.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 21
·19598-19608
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IF 2.195
Li Pengfei,Zhang Hong,Gao Caiyun,Jiang Guoxiang,Li Zhicheng
N egative temperature coefficient (NTC) ceramics based on simple ZnO were prepared and investigated in present work, where slight amount of Al- and La- ions were added as semiconductor dopants, and Cu-ions were selected as the sintering agent and property modificator. All the prepared ZnO-based ceramics have a wurtzite structure and show typical NTC characteristic. For various contents of Al-, La- and Cu- ions in ZnO-based ceramics, ρ 25 can be adjusted from 0.65 kΩ cm to 3.28 MΩ cm, and B values were obtained in range of 2500 K to 5850 K. The ageing treatment at 125 °C for 600 h in air revealed that the ZnO-based ceramics have high thermal stability with the resistance shift < 2%. The complex impedance spectra were applied to analyze the electrical performance.
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REACTIVE & FUNCTIONAL POLYMERS
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2019
·
IF 3.074
Xiaoyi Zhang,Xubao Jiang,Xiaoli Zhu,Xiang Zheng Kong
The pollution by metal ions has been a key issue in environmental protection. Amine-rich porous polyurea (PPU), prepared by a simple one-step precipitation copolymerization of diisocyanate and diamine, is highly selective for Cu 2+ adsorption, but associated with a poor reusability. We report here a chemically modified PPU by simply turning the amine groups of PPU to aminoacetic carboxyls. The results indicate that this carboxylation is an easy and effective pathway to polymer adsorbent, with high performance for Cu 2+ adsorption and reusability superior to most of the reported adsorbents. Cu 2+ adsorption capacity on PPU-M, i.e. PPU after carboxylation, increased to 2.84 mmol/g, an increase by 22% in comparison with PPU. The chemical modification process was optimized. The porosity and morphology of PPU-M were characterized using N 2 adsorption, mercury intrusion, and scanning electron microscopy. The high Cu 2+ adsorption was interpreted through a complex coordination mechanism of Cu 2+ based on XPS analysis . The high performance of reusability of PPU-M, thanks to enhanced desorption of 99.5% or more of the adsorbed Cu 2+ after each recycled use, was also interpreted based on the stability constants of acid-base equilibrium of amine and carboxyl towards Cu 2+ and protons. Adsorption kinetics modelling demonstrated this adsorption followed the pseudo-second-order model. The adsorption analysis by isothermal adsorption showed this adsorption was well fitted by Freundlich equation and in good agreement with the suggested adsorption mechanism.
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MATERIALS & DESIGN
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2019
·
IF 5.77
Tianhao Ge,Wenjie Zhao,Xuedong Wu,Yangmin Wu,Lu Shen,Xiaojing Ci,Yanlin He
To make good use of the barrier effect of graphene nanosheets and to reduce the uneven dispersion of zinc particles caused by its sedimentation, coating with alternate structure containing rGO was developed to provide Cu a long-term corrosion protection. Ionic liquid was used to obtain a better dispersion of rGO in solvent, which was proved by TEM, SPM images and sedimentation experiment. The enhanced long-term anti-corrosion protection of alternate coating was revealed by electrochemical tests. OCP and EIS results showed enhanced barrier performance of epoxy-G compared with epoxy and improved sacrificial anode protection of epoxy-Zn-G compared with epoxy-Zn. Tidal range-corrosion simulation test was also performed to show that the alternate coating can stick on copper substrate without peeling off even in harsh corrosive environment for 432 h. Furthermore, EIS, XRD, and XPS spectra together proved that the excellent anti-corrosion property of alternate coating was originated from the combination of sacrificial anode protection provided by zinc-rich-epoxy layer with barrier protection provided by rGO-doping-epoxy layer. This combination makes it reality to protect copper substrate from corrosion for longer time immersion in 3.5 wt% NaCl solution compared with epoxy-Zn-G.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Ziyun Xu,Shiqi Weng,Chenhui Li,Ming Jin,Decheng Wan
Aminopolycarboxylic acids (APAs) show a strong affinity toward heavy metal species, but straightforward and robust studies on the surface of porous adsorbents with APAs are rarely available. In this study, branched polyethyleneimine (PEI) is directly used to investigate the surface of a microcrystalline cellulose (MC)-supported porous monolith (MC@PEI) through an oil-in-water high internal phase emulsion technique. The residual amines of the covalently immobilized PEI are transformed into dense APAs (MC@PEI-APA). The open-cellular MC@PEI-APA monolith can effectively eliminate trace Cu(II) or Zn(II) from water relative to MC@PEI. Moreover, its adsorption complies with the second-order kinetics and follows the Langmuir adsorption model. MC@PEI-APA shows high adsorption capacities (e.g., 96 mg g −1 for Cu(II)). It also presents stronger metal affinities than the commercial Amberlite IRC-748 adsorbent possibly because of the cooperative ligation of metal species by the relatively dense APA groups of MC@PEI-APA. The proposed adsorbent is durable and has good recyclability.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Shuo Wang,Lirong Zhao,Rui Xu,Yanqing Ma,Lei Ma
Copper nanoparticles modified as-grown monolayer and bilayer graphene on copper substrates have been used for non-enzymatic electrochemical glucose sensing. The high quality, continuous, full coverage graphene on copper substrate act as a good electrochemical electrode which obviating the tedious transfer processes. The present sensor shows excellent performance for glucose detection including a wide linear range of 0.02–2.3 mM, a low detection limit (1.39 μM, S/N = 3), high sensitivity (379.31 μA mM −1 cm −2 ), fast response time (＜5 s), good selectivity to the general coexisted interferences, reliable stability, etc. We believe this kind of electrode has a great potential for practical glucose sensing applications and also promise for other biomolecules detection.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Guangpeng Yang,Xuesen Du,Jingyu Ran,Xiangmin Wang,Yanrong Chen,Li Zhang,Vladislav Rac,Vesna Rakic,John Crittenden
SCR activity of Cu-SAPO-34 catalyst was reduced by alkali metal ions. The alkali metals ions (Li + , Na + and K + ) have shown irregular influences on Cu-SAPO-34. The order of poisoning strengths under 400 °C was found to be: Na + > K + > Li + , which is not consistent with the basicities of their corresponding metals. Experimental results and calculations showed that the alkali metal ions readily replace H + and Cu 2+ /Cu + ions. These exchanges result in the loss of Brønsted acid sites and migration of isolated Cu 2+ ions in Cu-SAPO-34, which decrease the NH 3 -SCR activity. Both the basicity and ion diameter will affect the exchanging behavior of an alkali ion. Na + and Li + ions will influence both H + and Cu 2+ /Cu + ions but K + ions only preferably replace the H + . We hypothesize that K + cannot enter into a small ring (6-membered ring) to replace a Cu 2+ /Cu + ion because of its large ion diameter. The displaced Cu 2+ /Cu + ions will transfer to adjacent unbonded Al site to form a CuAlO 2 species.
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IONICS
·
2019
·Vol. 26
·期 5
·2225-2231
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IF 2.289
Liu Lili,Wang Xiaoyang,Zhang Xiaohong,Zhang Xiuyun,Chen Shimou
Germanium-based materials as anode can improve the capacity of lithium-ion battery because of its excellent lithium-ion storage ability. But the application of Ge anode is hampered by the huge volume variation during de/lithiation processes. Herein, a Ge/Cu wire mesh (Ge/Cu-WM) electrode is prepared by ionic liquid electrodeposition, where the Ge nano-film is deposited on Cu wire mesh. The unique structure of Ge/Cu-WM electrode not only buffers the volume expansion but also enhances electron migration and electron transport during lithiation. The Cu 3 Ge is observed by XRD, which confirms that the Ge nano-film tightly attach to the Cu wires. All structural properties give the electrode excellent electrochemical performance, where a capacity of 633 mAh/g after 100 cycles at 0.1 C is obtained. The reasonable structure and improved cycling stability make Ge-based anodes highly attractive for lithium-ion battery applications.
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ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Xu Dong,Lukas Ohnoutek,Yang Yang,Yiqing Feng,Tao Wang,Muhammad Ali Tahir,Ventsislav K. Valev,Liwu Zhang
Surface enhanced Raman spectroscopy (SERS) shows great promise in studying individual atmospheric aerosol. However, the lack of efficient, stable, uniform, large-array, and low-cost SERS substrates constitutes a major roadblock. Herein, a new SERS substrate is proposed for detecting individual atmospheric aerosol particles. It is based on the sphere segment void (SSV) structure of copper and silver (Cu/Ag) alloy. The SSV structure is prepared by an electrodeposition method and presents a uniform distribution, over large 2 cm2 arrays and at low cost. The substrate offers a high SERS enhancement factor (due to Ag) combined with lasting stability (due to Cu). The SSV structure of the arrays generates a high density of SERS hotspots (1.3 × 1014/cm2), making it an excellent substrate for atmospheric aerosol detection. For stimulated sulfate aerosols, the Raman signal is greatly enhanced (>50 times), an order of magnitude more than previously reported substrates for the same purpose. For ambient particles, collected and studied on a heavy haze day, the enhanced Raman signal allows ready observation of morphology and identification of chemical components, such as nitrates and sulfates. This work provides an efficient strategy for developing SERS substrate for detecting individual atmospheric aerosol.
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RSC Advances
·
2022
·Vol. 12
·期 48
·31186-31191
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IF 4.036
Dandan Jiang,Minghao Zheng,Xiaoyang Yan,Bin Huang,Hui Huang,Tianhao Gong,Kunming Liu,Jinbiao Liu
Herein, we report a highly selective fluorescent probe for the detection of Cu(II). The detection mechanism relies on the Cu(II)-catalyzed oxidative hydroxylation of 2-(aminocarbonyl)phenylboronic acid into salicylamide, thus recovering the excited-state intramolecular proton transfer (ESIPT) effect and inducing more than 35-fold fluorescence enhancement. The simple structure and readily available fluorescent probe give a novel method for quantitatively detecting Cu(II) in the linear range of 0–22 μM, with a limit of detection down to 68 nM, and exhibiting high selectivity for Cu(II) over 16 other metal ions.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Xin-Yan Zhang,Xu-Xia Yan,Shao-Yu Sun,Cheng-Zhen Wu,Hui-Dong Qiu,Qian-Yu Zhou
Laccase-like Cu-GMP complex forms directly without tedious synthesis. • The homogeneous system effectively avoids light-scattering interference. • The platform detects 2,4-DCP, BPA and epinephrine with low detection limits. • Smartphone-based colorimetry enables portable, low-cost on-site detection. • Good recoveries are achieved in lake water and human serum samples. The rapid and sensitive screening of phenolic compounds is essential for environmental safety and clinical diagnostics. Although laccase-like Cu-based nanozymes offer cost-effective alternatives to natural enzymes, most existing platforms rely on heterogeneous nanoparticles. These systems not only require tedious pre-treatment, but also suffer from light scattering that compromises colorimetric accuracy. Herein, a homogeneous colorimetric sensing platform based on the laccase-like activity of a copper-guanosine 5′-monophosphate (Cu-GMP) complex was developed. The complex is prepared directly in solution without the need for time-consuming synthesis. Furthermore, this homogeneous system eliminates light-scattering interference due to its intrinsic optical transparency. Benefiting from its catalytic versatility, the platform enabled the quantification of three phenolic targets. 2,4-dichlorophenol (2,4-DCP) and bisphenol A (BPA) were detected via 4-aminoantipyrine (4-AAP)-mediated coupling, while epinephrine was quantified by direct catalytic oxidation, with detection limits of 0.22, 0.59, and 0.21 μM, respectively. Additionally, integrating this system with smartphone technology enabled a portable platform for on-site quantification, demonstrating reliable accuracy in lake water and human serum samples. Overall, this work provides a versatile and low-cost homogeneous strategy for the point-of-need screening of phenolic pollutants and biomarkers. Download: Download high-res image (123KB) Download: Download full-size image
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Xin Xu,Jinhui Cai,Penghua Guo,Zhilin Zhou,Junya Cui,Yaqiang Ji,Jin-Qi Xie
A vertically aligned metal array based TIM was fabricated by electroless deposition on polyamide fibers. • The metal coated polyamide fibers exhibit excellent flexibility and resistance to oxidation. • The TIM demonstrate high thermal conductivity of 69.3 W/m·K, low Young's modulus of 32.5 MPa and excellent compliance. Constructing continuous high-thermal-conductivity channels that penetrate through the polymer matrix is one of the key approaches to achieving next-generation high-performance composite thermal interface materials (TIMs). Currently, the only reported metal copper microarray-based TIMs fabricated via porous sacrificial templating are costly and cumbersome. In this work, a novel and facile route is developed for constructing flexible, metallic array TIMs based on electroless plating of polyamide fiber arrays. The resulting Cu Ag bimetallic-coated (PA@Cu@Ag) fiber structures provide high-thermal-conductivity and performance-stable flexible channels for high-performance TIMs. The composite TIM, with the PA@Cu@Ag fiber array serving as the skeleton, exhibits a thermal conductivity as high as 69.3 W/m·K and a Young's modulus as low as 32.5 MPa. Its performance remains stable even after 1000 compression cycles and LED device on/off cycling. When assembled in LED devices, it significantly reduces the steady-state operating temperature to 58.0 °C, far outperforming conventional particle-filled composite materials. Download: Download high-res image (70KB) Download: Download full-size image
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