Journal of Materials Chemistry C
·
2015
·Vol. 4
·期 3
·581-588
·
IF 4.696
Sheng Cao,Wenyu Ji,Jialong Zhao,Weiyou Yang,Chengming Li,Jinju Zheng
Recently, Cu-doped ternary chalcogenide quantum dots (QDs) have attracted extensive attention due to their large Stokes shift and tunable photoluminescence (PL) behavior in the visible and near-infrared (NIR) spectral range, and particularly for their remarkably lower toxicity than their Cd-based counterparts. However, there still remain material- and fabrication-related obstacles in realizing high-performance Cu-doped QDs, which limit their promising applications in light-emitting devices and bio-labeling. In the present study, we report the facile synthesis of high-qualified Cu-doped Zn–In–Se QDs via a hot injection approach, using a heterogeneous dispersion of Se in octadecene (ODE) as a “green” Se precursor. With variation of the ratios of Zn to In, the obtained Cu-doped Zn–In–Se QDs exhibited composition-tunable PL emissions over the most visible spectral window (ca. 565–710 nm) with a PL quantum yield (QY) up to 38% after coating ZnSe shells, which is the highest one ever reported in this system. Furthermore, we report, for the first time, the exploration of QD light-emitting diodes (QD-LEDs) based on the Cu-doped Zn–In–Se QDs as the active layer, which had a maximum luminance of 320 cd m−2 and a luminous efficiency (LE) of 0.97 cd A−1 (at 98 cd m−2), suggesting their promising potential for application in optoelectronic devices.
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RSC Advances
·
2014
·Vol. 4
·期 39
·20459-20465
·
IF 3.708
Huanhuan Huo,Chunyan Guo,Guilin Li,Xu Han,Cailing Xu
In this work, reticular-vein-like Cu@Cu2O/rGO nanocomposites have been synthesized by direct redox reaction of Cu and graphene oxide (GO) through a hydrothermal method where the macropore Cu sheets served as the precursor of reticular-vein-like Cu2O as well as the reducing agent of GO. FESEM and TEM were employed to characterize the morphology of the as-prepared samples. The results reveal that the reticular-vein-like Cu@Cu2O nanocomposites are homogeneously anchored onto rGO and act like the skeleton supporting the rGO sheets to avoid its aggregation or stacking. Electrochemical tests show that the Cu@Cu2O/rGO modified glassy carbon electrode (GCE) exhibits remarkable electrocatalytic activity towards glucose oxidation in both alkaline medium and human serum, including a wide linear range (0.005–7 mM), a low detection limit (0.5 μM), a rapid response (<2 s) as well as good stability and repeatability. More importantly, the interference from the commonly interfering species such as lactose, fructose, ascorbic acid (AA) and uric acid (UA) can be effectively avoided. All these results indicate this novel nanostructured material is a promising candidate for non-enzymatic glucose sensors.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2015
·
IF 2.133
Na Zhang,Lei Shi,Tingting Yu,Tianduo Li,Wei Hua,Cong Lin
Pure STW-type germanosilicate (denoted as GeSi-STW), Cu- and Co-containing STW-zeotype (denoted as Cu-STW and Co-STW) materials were synthesized by the hydrothermal method in the presence of an organic structure-directing agent (OSDA), N , N -diethylethylenediamine (DEEDA). The effects of the reaction mixture ratio and the incorporation of transition metals M ( M =Cu and Co) on the synthesis of the pure product was investigated. The synthesized samples were characterized by powder and single-crystal X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma analysis (ICP), thermogravimetric and differential scanning calorimetry (TG–DSC) analysis and UV–vis diffuse reflectance spectra (DRS). The results reveal that the crystallization time, the concentration of H 2 O in the reaction mixture and the addition of HF all have an important impact on the synthesis of pure STW-type zeolite . GeSi-STW is stable up to 800 °C, and has much higher thermal stability than SU-32 (stable to 400 °C). Co and Cu have been introduced for the first time into STW-zeotype materials.
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Journal of Materials Chemistry B
·
2013
·Vol. 1
·期 33
·4160-4165
·
IF 0
Wei-Wei Xiong,Guo-Hai Yang,Xing-Cai Wu,Jun-Jie Zhu
Low-toxicity, highly luminescent, and water-soluble AgInS2/ZnS nanocrystals (NCs) have been synthesized via a microwave-assisted approach. The structure and optical features of the AgInS2/ZnS NCs were characterized by X-ray diffraction, high resolution transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet visible absorption spectroscopy and photoluminescence (PL) spectroscopy. The as-synthesized AgInS2/ZnS NCs exhibited high PL quantum yields (40%) and long PL lifetimes (424.5 ns). Furthermore, the dynamic changes of the intracellular copper(II) levels in HeLa cells were monitored using the AgInS2/ZnS NCs as fluorescent probes. The results showed that the AgInS2/ZnS NCs as promising fluorescent probes can be used in the detection of intracellular copper ions in living cells.
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PubMed
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 37
·11438-11442
·
IF 0
Songjie Fan,Fuxing Sun,Jijiang Xie,Jin Guo,Laiming Zhang,Chunrui Wang,Qikun Pan,Guangshan Zhu
Cu(bipy)2(SiF6) is a highly porous metal–organic framework (MOF) and represents a prototypal “pillared sheet” platform offering opportunities to control the pore sizes. Its structural features, low cost and facile synthesis make it a great candidate to fabricate membranes for gas separation. The key to obtaining thin, continuous Cu(bipy)2(SiF6) membranes is to control the Cu(bipy)2(SiF6) crystal growth and enhance the binding between membrane and substrate. Here we explored a new route by direct synthesis and successfully obtained a continuous thin Cu(bipy)2(SiF6) membrane on a macroporous glass-frit disk with high robustness. It is speculated that the SiF62− used to construct the Cu(bipy)2(SiF6) membrane came from the fluorinated substrate. The Cu(bipy)2(SiF6) membrane shows the separation factors of H2–CO2, H2–CH4 and H2–N2 are 8.0, 7.5, and 6.8 respectively at 293 K and 1 bar with H2 permeance of 2.7 × 10−7 mol m−2 s−1 Pa−1 as well as high thermal stability. We expect to explore more membranes of Cu(bipy)2(SiF6) analogues with tuneable pore sizes using this route and to obtain membranes with higher gas separation performance.
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Reaction Kinetics Mechanisms and Catalysis
·
2017
·Vol. 122
·期 2
·1129-1143
·
IF 1.264
Hou Miaomiao,Jiang Hong,Liu Yefei,Chen Rizhi
The work aims to investigate the role of initial water content in the glycerol hydrogenolysis to 1,2-propanediol over Cu–ZnO in depth by characterizing the fresh and spent catalysts in detail with ICP, XRD, XPS, EDS, HRTEM, N 2 sorption, N 2 O chemisorption, H 2 -TPD and NH 3 -TPD. The glycerol conversion and 1,2-propanediol selectivity gradually reduce simultaneously with increasing initial water content. At higher initial water content, more CuO are formed, bringing about a decrease in the 1,2-propanediol selectivity. The sizes of Cu and ZnO crystallites increase tremendously with increasing initial water content, lowering the active surface area and acidity. Furthermore, the surface Cu content reduces along with the increase of surface Zn content at higher initial water content. The two aspects make a decrease in the glycerol conversion. This work would aid the glycerol hydrogenolysis to 1,2-propanediol over Cu–ZnO with high catalytic efficiency.
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AICHE JOURNAL
·
2017
·Vol. 64
·期 2
·538-549
·
IF 2.836
Yiyi Sheng,Yang Sun,Jing Xu,Jie Zhang,Yi-Fan Han
Cu-embedded mesoporous alumina, as a Fenton-like catalyst prepared via a sol-gel method, showed excellent activity and durability for the degradation of refectory compounds. The origin of active sites for the generation of hydroxyl radicals (•OH) were thoroughly studied using multitechniques. Cu, as the only active element, could be penetrated into the bulk of alumina and some Cu atoms were embedded into the framework. The dynamic structure of surface Cu species (the variety of Cu + /Cu 2+ ratio) during the reaction were determined as well. Furthermore, the structure plasticity of catalyst has proved by optimizing preparation and reaction conditions. A 98.53% degradation of RhB was recorded within 30 min, following a pseudo-first-order reaction rate expression. Electron spin resonance spectra and •OH scavenging experiments have confirmed that •OH is the main reactive oxidant for the elimination of RhB. By the surface-enhanced Raman spectroscopy and gas chromatography-mass spectrometer results, plausible pathways of RhB degradation were elaborated. © 2017 American Institute of Chemical Engineers AIChE J , 64: 538–549, 2018
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Laipan Minwang,Fu Haoyang,Zhu Runliang,Sun Luyi,Zhu Jianxi,He Hongping
Recycling solid waste as functional materials is important for both environmental remediation and resource recycling. This study attempts to recycle spent Cu/Fe layered double hydroxide (Cu/Fe-LDH) which is generated from the adsorption of dyes by converting to Cr(VI) reductant and porous carbon material. Results showed that the obtained reductant was mainly composed of Fe 0 and Cu 0 , and exhibited good reductive activity toward Cr(VI). The species of Fe 0 , Fe 2+ , Cu 0 , and Cu + all favored the reduction of Cr(VI) according to X-ray photoelectron spectroscopy analysis. During Cr(VI) removal, solution pH could increase to neutral which caused the metal ions to precipitate near completion. On the other hand, the spent Cu/Fe-LDH could be employed to produce porous carbon materials, and the generated waste metals solution herein could be reused for LDH synthesis. Specific surface areas of the obtained carbon materials varied from 141.3–744.2 m 2 /g with changes in adsorbed amount of dyes on the LDH. This study illustrates that all the components of wastes can be useful resources, offering a simple recycling approach for similar organic-inorganic solid wastes. This work also enlightens us that designing a proper initial product is crucial to make waste recycling simpler.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2016
·
IF 3.13
Qiang Liu,Qinze Liu,Zining Ruan,Xiaoqing Chang,Jinshui Yao
A novel poly(catechol-diethylenetriamine-pphenylenediamine)(PCEA) adsorbent was synthesized in methanol, with chelating groups supplied by catechol and diethylenetriamine, which showed a strong removal performance and efficient adsorption toward Cu(II) ions in aqueous solution. The adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Besides, factors such as adsorbent dosage, pH, initial ionic and metal concentrations, contact time, and temperature on the adsorption of Cu(II) were studied. The data revealed that the adsorption followed a pseudo-second order kinetic model and the adsorption rate was influenced by the intra-particle diffusion. Furthermore, the adsorption process followed the Langmuir isotherm model, and the maximum adsorption capacity ( Q m ) was 44.2 mg/g at 298 K in simulated wastewater. The value of Δ G (kJ/mol) and Δ H (kJ/mol) also demonstrated that the adsorption process was spontaneous and endothermic. Studies revealed that PCEA particles were powerful and stable for the removal of Cu(II) in water, and it could be directly applied to the Cu(II)-contaminated water.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Shuang Li,Te Wei,Mingyu Tang,Fang Chai,Fengyu Qu,Chungang Wang
Here, we reported on a route to the facile synthesis of bimetallic silver doped copper nanoparticles (Ag-Cu NPs) by AgNO 3 and CuSO 4 in the presence of sodium borohydride and sodium citrate. The present work described the preparation of the Ag-Cu NPs with sodium citrate and the use of them in colorimetric detection of mercury (II) ions. Ag-Cu NPs with an average diameter of 9.0 ± 0.8 nm were prepared via two step reduction at room temperature. The Ag-Cu NPs were thoroughly characterized by using UV–vis spectroscopy and transmission electron microscopy (TEM) techniques. The morphology and constitution of the Ag-Cu NPs were characterized by TEM, and the valence state of Ag-Cu NPs was confirmed by the X-ray photoelectron spectroscopic (XPS) result. The synthesized Ag-Cu NPs were yellow in color due to the intense surface plasmon absorption band centered at 406 nm. This high selective sensor allowed a direct quantitative assay of mercury ions (Hg 2+ ) with a detection limited of 0.51 nM. The synthesized Ag-Cu NPs also exhibited good catalytic activity in two model reactions, the reduction of the nitrophenols and potassium ferricyanide (III) by sodium borohydride.
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ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 6
·1230-1235
·
IF 0.767
WANG Mei-Song,ZOU Pei-Pei,HUANG Yan-Li,WANG Yuan-Yuan,DAI Li-Yi
A composite hydrogel consisting of well-dispersed Pt-Cu nanoparticles (NPs) supported on three-dimensional (3D) graphene (Pt-Cu@3DG) was successfully prepared by mild chemical reduction. The 3D interconnected macroporous structure of the graphene framework not only possesses large specific
surface area that allows high metal loadings, but also facilitates mass transfer during the catalytic reaction. The Pt-Cu bimetallic alloy NPs show good catalytic activity compared with Pt NPs and reduce the content of Pt NPs used, thereby lowering costs. The morphology and composition of
the Pt-Cu@3DG composite were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDX). The catalysis studies indicate that the resulting composites
can be used as an efficient, inexpensive, recyclable, and stable catalyst for the reduction of 4-nitrophenol to 4-aminophenol under mild conditions.
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CATALYSIS LETTERS
·
2016
·Vol. 146
·期 8
·1408-1414
·
IF 2.294
Kang Yumei,Bu Xiaosong,Wang Guangyu,Wang Xiaoqing,Li Qianwen,Feng Yisi
Abstract A series of bimetallic Cu samples (Cu–Pt/SiO 2 , Cu–Pd/SiO 2 , Cu–Ag/SiO 2 , Cu–Ni/SiO 2 ) were prepared by wetness impregnation method, then investigated for hydrogenolysis of glycerol to 1,2-propanediol (1,2-PDO). We furthered the study and found that Cu–Pt/SiO 2 got the smallest particle size and greatest dispersion. Besides, it was found that Pt promoted reduction of Cu 2+ . Compared with other Cu–Pt molar ratio, Cu–Pt/SiO 2 (1:0.2) was the preferable catalyst for hydrogenolysis of glycerol to 1,2-PDO. It is worth noting that Cu–Pt/SiO 2 presented the highest activity with a 96 % selectivity to 1,2-PDO and a nearly 100 % conversion of glycerol at 473 K, 40 bar initial H 2 pressure, 12 h, which is much higher activity than monometallic Cu/SiO 2 , Pt/SiO 2 and other bimetallic Cu samples. Meanwhile, the used Cu–Pt/SiO 2 catalyst still preformed high activity. Furthermore, it was found that the presence of Pt decreased the aggregation of particles during the hydrogenolysis of glycerol. Graphical Abstract
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