Acta Biomaterialia
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2018
·
IF 6.383
Meirong Hou,Chenggong Yan,Zelong Chen,Qingliang Zhao,Miaomiao Yuan,Yikai Xu,Bingxia Zhao
Ternary copper-based chalcogenide nanomaterials have become rather attractive due to the near-infrared (NIR) response in cancer theranostic fields. However, it is still challenging to further improve the theranostic efficiency of these nanomaterials. Herein, Cu-Sb-S nanoparticles (NPs) around 24 nm are synthesized facilely and functionalized with poly(vinylpyrrolidone) (PVP). Under the NIR irradiation, the resultant PVP-Cu-Sb-S NPs exhibit a relatively high photothermal conversion efficiency of 53.16% and a simultaneous reactive oxygen species (ROS) generation effect. Due to these outstanding photothermal/photodynamic effects, excellent tumor ablation results can be achieved by the combination of PVP-Cu-Sb-S NPs and 808 nm NIR laser treatments without obvious side effect. In addition, they show remarkable contrast enhancement according to in vitro and in vivo photoacoustic (PA) imaging. These PVP-Cu-Sb-S NPs could be served as a multifunctional nanotheranostic agent for PA imaging, photothermal/photodynamic cancer therapy. Statement of Significance Highly theranostic efficiency ternary copper-based chalcogenide nanomaterials has not been fully developed yet. Herein we report the PVP-Cu-Sb-S nanoparticles (NPs) with relatively high photothermal efficiency, simultaneous reactive oxygen species generation effect and photoacoustic imaging capability. The photothermal conversion efficiency of PVP-Cu-Sb-S NPs is higher than most of copper-based chalcogenide nanomaterials reported before. These findings provide a new kind of ternary copper-based chalcogenide with an enhanced theranostic effect, which could be served as a promising multifunctional nanotheranostic agent in the field of biomedical application.
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高影响因子
JOURNAL OF CATALYSIS
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2018
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IF 6.759
Bing Hu,Yazhi Yin,Guoliang Liu,Shengli Chen,Xinlin Hong,Shik Chi Edman Tsang
Surface modification with Pd is an effective way for improved activity in CO 2 hydrogenation to methanol over commercial Cu-ZnO catalysts via a so-called hydrogen spillover mechanism. However, there still lacks a quantitative analysis of hydrogen spillover effect and the nature of active sites after Pd modification remains unclear. In this work, we prepared a series of Pd-doped Cu-ZnO catalysts (Pd-CZ-x) with tunable Pd loading by using a facile polyol reduction method for a deep study of the promotion effect of Pd. With the increase of Pd/Cu molar ratio (x) from 0 to 0.04, there emerges a volcano-shaped relationship between methanol space time yield (STY) and Pd loading. 1% Pd doping can increase the methanol STY by 2.5 times and the methanol turnover frequency (TOF) by 3.5 times at 543 K, when compared to undoped Cu-ZnO. Kinetic studies show the activation energy required for methanol synthesis is greatly reduced from 59 kJ mol −1 over Cu-ZnO to 31 kJ mol −1 over Pd-CZ-0.01. Behind the volcano-shaped relationship is a balance between the hydrogen spillover effect of Pd and the reduced surface Cu area caused by Pd blocking. Chemisorption gives a quantitative analysis of an important type of activated Cu sites enabled by hydrogen spillover (Cu hs ). Importantly, it is found that the methanol STY correlates linearly with Cu hs surface area, suggesting that the activated Cu sites with the assistance of ZnO are real active sites for methanol synthesis from CO 2 hydrogenation.
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Environmental Earth Sciences
·
2018
·Vol. 77
·期 12
·1-10
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IF 1.435
Wang Jing,Wen Xin,Yang Fan,Cao Zhanfang,Wang Shuai,Zhong Hong
A novel two-dimensional carbon material using phytic acid-functionalized graphene oxide was successfully synthesized by a simple hydrothermal method. Properties of the material were characterized by SEM, FT-IR, FITR-Rama and BET. Some factors like contact time, pH, and temperature were studied to investigate the adsorption characteristics on Cu(II) ions of the material. Experiment results showed that the material can reach equilibrium adsorption in 20 min and get maximum adsorption capacity (316.586 mg g) under the condition of pH 4.0, 304 K. The adsorption of Cu(II) ions was an exothermic and spontaneous process, and could be better simulated by the pseudo-second-order kinetics and Freundlich isotherm model.
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ANALYST
·
2018
·Vol. 143
·期 13
·3068-3074
·
IF 3.864
Shanliang Song,Yuping Zhang,Yizhou Yang,Chuanxi Wang,Ying Zhou,Chuan Zhang,Yueqi Zhao,Minghui Yang,Quan Lin
A fast, sensitive, and convenient dual-emission water detector was robustly fabricated. This detector was prepared with blue fluorescent carbon dots (CDs) and red fluorescent Cu nanoclusters (NCs), and showed two well-resolved and intensity-comparable fluorescence peaks under a single excitation wavelength. Moreover, it showed strong red fluorescence in organic solvent due to the aggregation-induced emission enhancement (AIEE) properties of the Cu NCs, but the red fluorescence was gradually quenched with an increasing amount of water, whereas the blue fluorescence remained constant. The differences in response result in a continuous fluorescence color change from red to blue that can be clearly observed by the naked eye. Thus, as-prepared Cu NC-based dual-emission nanomaterials can be used for ratiometric fluorescence detection of trace amounts of water in organic solvents by taking advantage of the water sensitivity of their fluorescence intensity ratios (red/blue) and their low detect limits (<0.02% v/v). These studies demonstrate that a novel and sensitive dual-emission ratiometric water detector has been found, which shows promise for application in environmental monitoring, food inspection, and life science.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2018
·
IF 3.649
Yiping Tang,Chaoqi Bi,Duo Zhang,Guangya Hou,Huazhen Cao,Liankui Wu,Guoqu Zheng,Qingliu Wu
To overcome the shortcomings of poor conductivity and large volume change, we proposed a novel three-dimensional ordered macroporous Cu/Sn (3DOM Cu/Sn) composite material as the anode of lithium-ion batteries (LIB). Electron microscopies and X-ray diffraction revealed that this new 3DOM Cu/Sn composite has the surface of the 3DOM Cu framework covered with a uniform layer of Sn nanoparticles . As a binder-free anode of LIB without conductive additives, this 3DOM Cu/Sn composite demonstrated an extremely high rate capability of about 707 mAh/g at 5C, which is 4 times higher than that of bare Cu/Sn anode, and excellent durability of 851 mAh/g up to 250 cycles. The post-test analysis showed that extraordinarily electrochemical performances of this composite anode are ascribed to the unique 3DOM microstructure.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Guang Yang,Haixu Wang,Ning Wang,Rong Sun,Ching-Ping Wong
Copper chemical mechanical planarization (Cu-CMP) is an essential procedure for the fabrication of integrated circuits (IC). The corrosion inhibitors in the Cu-CMP slurry could balance the over etching from the corrosion reagents to facilitate the global planarization of the copper layers. However, the normally used Cu-CMP inhibitor 1-benzotriazole (BTA) was toxic for the long time usage. In this paper, the biocompatible polyvinyl pyrrolidone (PVP) was proposed to substitute the BTA in the Cu-CMP. With an integrated electrochemical test, including the Tafel polarization, electrochemical impedance spectra (EIS), and the electrochemical noise (EN), it was found that the PVP could possess a good inhibition effect comparable to BTA, which opened up a promising way for the design of biocompatible inhibitors in the Cu-CMP.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Huiming Li,Yang Wang,Wei Zhu,Zhongbin Zhuang
Searching for low-cost electrocatalysts with high activity towards the hydrogen evolution reaction (HER) is of great significance to enable large-scale hydrogen production via water electrolysis . In this study, by using inverse spinel MFe 2 O 4 (M = Mn, Fe, Co, Cu) nanoparticles (NPs) as the precursors, monodisperse bimetallic phosphide M-Fe-P NPs/C with hollow structures were readily obtained by a gas-solid annealing method. These hollow phosphide NPs displayed excellent HER activity in an acidic medium with a low loading amount of 0.2 mg cm −2 . In particular, the Co–Fe–P NPs/C shows highest HER activity that only requiring an overpotential of 97 mV to retain a current density of 10 mA cm −2 . A volcano relation between activity and incorporated elements was revealed. Incorporation of cation with high electronegativity stabilized the FeP active centres, while phase segregation resulted in the loss of activity for Cu–Fe–P NPs/C.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Rong Dai,Ziliang Zheng,Wenjun Yan,Chenshuai Lian,Xu Wu,Xia An,Xianmei Xie
The critical problem facing catalysts for the LT-ESR is deactivation owing to sintering of the active metal and carbon deposition. To solve this problem, a dragon fruit-like Pt-Cu@mSiO 2 catalyst for LT-ESR reaction has been successfully fabricated by a facile encapsulation strategy. Structural and morphological analysis shows that the Pt-Cu@mSiO 2 nanocomposite (approximately 400 nm) has a uniform dragon fruit-like structure, with well crystallized Pt-Cu alloy nanoparticles (about 50 nm) embedded in the mSiO 2 . Benefiting from the unique components and architectural features, the dragon fruit-like Pt-Cu@mSiO 2 nanocomposite with optimal Pt/Cu ratio present superior performance than that of Pt@mSiO 2 , Cu@mSiO 2 and supported Pt-Cu/mSiO 2 catalysts in terms of activity, H 2 selectivity, and stability in the LT-ESR reaction. Moreover, the synergistic effect of platinum and copper can substantially decrease the CO concentration. It is crucial that the mesoporous SiO 2 shell not only make the embedded Pt-Cu alloy nanoparticles easily accessible but also effectively prevent leaching and aggregation of active sites as well as spatially suppress the carbon deposition on the active surface, thus maintain a good catalytic activity during the 150 h stability test at 400 °C.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 15
·14528-14537
·
IF 2.195
Zeng Yuan,Li Zhicheng,Shao Junming,Wang Xianchi,Hao Wenbin,Zhang Hong
Cu/Nb doped YFeO 3 ceramics were synthesized through wet chemical method followed by traditional ceramic sintering technology. The phase component and electrical properties of the ceramics were investigated. The XRD pattern shows that all the prepared ceramics have the orthorhombic perovskite structure with space group of P nma . The XPS analysis demonstrates the existence of Fe 2+ and Fe 3+ in the ceramics. The temperature dependence of resistivity indicates that YFeO 3 -based materials have a characteristics of negative temperature coefficient (NTC) of resistivity. The room temperature resistivities (306–1.52 × 10 5 Ω cm) and temperature sensitivity B values (2693–5395 K) can be effectively adjusted by changing the contents of Cu- and Nb- ions. According to the analysis of complex impedance spectra at various temperatures, the NTC characteristic could be attributed to grain effect and grain boundary effect. The possible conduction mechanisms are propose to hopping conduction and band conduction in grain, and thermal activation transport of charge carries in grain boundary.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2017
·
IF 3.671
Shaojun Yuan,Ping Zhang,Zhenyi Yang,Li Lv,Shengwei Tang,Bin Liang
Cross-linked chitosan (CCS) microspheres tethered with melamine-conjugated poly(hydroxyethyl methacrylate) (PHEMA) brushes were synthesized by combination of surface-initiated atom transfer radical polymerization (ATRP) of HEMA and subsequent covalent immobilization of melamine onto the chain ends of PHEMA brushes. The as-synthesized CCS microsphere was used as a novel adsorbent for effective uptake of Cu(II) ions from aqueous solution. Success in each functionalization step was ascertained by SEM, ATR-FTIR and XPS characterization. Batch adsorption experimental results demonstrated that the adsorption equilibrium of Cu(II) ions on the melamine-grafted CCS microsphere was rapidly established within 20 min, and the adsorption process was found to be governed by intra-particle diffusion and chemisorption processes. The Langmuir-fitted maximum adsorption capacity of Cu(II) ions on the as-synthesized CCS microspheres was as high as circa 4.67 mmol L −1 (299 mg g −1 ). The calculated thermodynamic parameters revealed an endothermic and spontaneous adsorption process of Cu(II) ions on the melamine-grafted CCS microspheres. XPS spectra revealed that the adsorption mechanism was attributed to coordination (or chelation) interactions between amino (or hydroxyl) groups with cationic Cu(II) ions.
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POWDER TECHNOLOGY
·
2017
·
IF 2.942
Lanbo Li,Rui Bao,Jianhong Yi,Liang Liu,Shuai Mao
Uniform dispersion of carbon nanotube (CNT) and strong interface combination between nano‑carbon reinforcement and metal matrix are of extremely importance to fabricate CNT/metals composite by powder metallurgy method due to the hereditary effects. Therefore, in this paper, CNT/Cu composite powder was fabricated through Spray Pyrolysis (SP) to improve the dispersity and interface property . Nucleation and growth of Cu grains on the CNT surface occurred in the ultrasonic atomization of acetate (Cu(CH 3 COO) 2 ·H 2 O) solution droplets with mono-dispersed CNT. The microstructures of composite powder were investigated by TGA , Raman, XRD, FESEM and TEM analysis methods. Results show that structural integrity and purity of CNT can be enhanced by SP process at 500 °C. And CNT/Cu composite powder with uniform dispersion and good combination between CNT and Cu particles could be obtained by SP even though high composition of CNT was added. At last, the mechanisms of nucleation and growth were estimated based on the microstructure analysis .
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Waste and Biomass Valorization
·
2017
·Vol. 10
·期 5
·1141-1150
·
IF 1.337
Fang Chengjiang,Liu Yanxiu,Wu Weibo,Li Hu,Wang Zhongwei,Zhao Wenfeng,Yang Tingting,Yang Song
Liquid-phase catalytic hydrogenation of furfural, followed by hydration to levulinic acid has been considered as one of efficient approaches for upgrading pentose sugars. However, a two-step process is generally employed, which involves the separation and purification of the key intermediate furfuryl alcohol from the reaction mixture. To simplify this catalytic process with improved efficiency, Cu-doped niobium phosphate ( x Cu/NbP; x = 0.1–5.0 wt%, denoted as Cu loading) catalysts with different Cu loadings were prepared by impregnation and reduction, which could catalyze furfural conversion to levulinic acid through a one pot single-step process. The as-prepared x Cu/NbP catalysts were characterized by H 2 -TPR, XRD, NH 3 -TPD, XPS, the pore size and pore volume and pyridine-adsorption FT-IR. In this study, the effect of Cu loading, formic acid amount, support type, reaction temperature/time and catalyst reusability on the reaction were investigated. It was found that 1.5 wt% Cu/NbP loading exhibited predominant catalytic activity in the cascade conversion of furfural, producing levulinic acid with a high yield of up to 67.0 mmol% using ten equivalent of formic acid at 160 °C for 3 h. Moreover, the possible mechanism was further elucidated. Also, the catalyst could be easily separated from the mixture, and reused with no remarkable loss of reactivity.
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