RSC Advances
·
2014
·Vol. 4
·期 97
·54547-54553
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IF 3.708
Xu Li,Aiwei Tang,Li Guan,Haihang Ye,Yanbing Hou,Guoyi Dong,Zhiping Yang,Feng Teng
Cu2−xS nanocrystals with different morphologies and crystal phases have been synthesized by using a simple one-pot and phosphine-free colloidal method, in which different alkanethiols (CnH2n+1SH, n = 8, 12, 18) have been selected as sulfur sources and capping ligands. The crystal phase can be transformed from monoclinic Cu1.94S to tetragonal Cu1.81S by varying the alkyl chain length of alkanethiols, and the morphology changes from nanospheres to nanodisks during the phase transformation. Strong localized surface plasmon resonance (LSPR) absorbance in the near-infrared (NIR) region has been observed in these Cu2−xS nanocrystals, which originates from excess holes in the valence band due to copper deficiencies. The alkyl chain length of alkanethiols plays an important role in the crystal phase, morphology and plasmonic properties of the as-obtained Cu2−xS nanocrystals.
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JOURNAL OF ELECTRONIC MATERIALS
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2024
·
IF 2.2
Li Yunkai,Wang Lige,Yang Ruizhi,Liang Li,Luan Qingdong,Liu Jing
Copper selenide (Cu 2 Se) has attracted extensive research interest in the field of thermoelectricity due to its large abundance of constituent elements, environmental friendliness, and excellent thermoelectric properties. In this study, a facile and low-cost hydrothermal synthesis method combined with vacuum sintering was used for Cu 2 Se-based sample preparation, and the possibility of improving the thermoelectric properties of Cu 2 Se by doping with rare earth elements (Tm, Er, Lu) was explored using experimental tests and density functional theory calculations. The electronic structure calculations show that the electrical conductivity is increased due to the increased electron density after rare earth element doping. At the same time, the sharp increase in the density of states at the Fermi level after rare earth element doping enhances the Seebeck coefficient of the Cu 2 Se matrix. The experimental results show that the thermoelectric properties of all the samples doped with rare earth elements (Tm, Er, Lu) were improved compared to the Cu 2 Se matrix. The doping of rare earth elements led to an increase in point defects and the formation of pores in the samples, which play an important role in reducing the thermal conductivity. Among them, the Tm-doped Cu 1.995 Tm 0.005 Se sample reached a maximum ZT value of 0.80 at 773 K, which is a nearly 43% increase compared to the Cu 2 Se matrix (ZT max = 0.56).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Ran Bi,Xiaoyan Ma,Pengcheng Ma,Qianqian Wang
Non-invasive detection of body fluid glucose concentration is of great significance in the diagnosis and treatment of diabetes, which poses a new challenge to the reduction of the detection limit of glucose sensors. In this work, a novel non-enzymatic glucose sensor (defect-rich cypress-leaf-like Cu 2+1 O@NiF) was proposed by rapid electrodeposition of cypress-leaf-like Cu 2+1 O on the surface of nickel foam (NiF) substrate. Due to the high electrochemical active surface area and abundant defects of cypress-leaf-like Cu 2+1 O providing more catalytic active sites, the prepared non-enzymatic sensor has an ultra-low detection limit (0.9 nM), high sensitivity (88,419.4 μA∙mM −1 ∙cm −2 (1 nM-0.5 μM) and 2095.5 μA∙mM −1 ∙cm −2 (1 μM-4.33 mM)) and wide linear range (1 nM-4.33 mM) with good selectivity, reproducibility and stability. Furthermore, the obtained sensors exhibited high detection stability, accuracy and recovery for glucose detection of human body fluid samples, which means that the defect-rich cypress-leaf-like Cu 2+1 O@NiF electrode is an ideal candidate for non-invasive glucose sensors.
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ACS Biomaterials Science & Engineering
·
2025
·
IF 5.5
Tao Liao,Jinxiu Liu,Jia Chen,Zhongjia Liu,Guolie Xie,Ning Guo,Ying Kuang,Linghui Dian,Cao Li,Yun Liu
Infected diabetic wounds represent a significant challenge in clinical care due to persistent inflammation and impaired healing. To address these issues, the development of novel wound dressings with both antibacterial and reactive oxygen species (ROS) scavenging properties is essential. Herein, we prepare a novel wound dressing composed of Cu2–xO nanoparticles decorated on Ti3C2 MXene (Cu2–xO@Ti3C2) and integrate it into a poly(vinyl alcohol) (PVA) matrix to form electrospun nanofibers (Cu2–xO@Ti3C2@PVA). Cu2–xO@Ti3C2 exhibits remarkable photothermal conversion efficiency and effective ROS scavenging properties. In vitro experiments demonstrated that Cu2–xO@Ti3C2 effectively kills bacteria upon near-infrared (NIR) irradiation, which can be attributed to the photothermal therapy (PTT) effect of Ti3C2. At the same time, the ROS scavenging abilities of both Ti3C2 and Cu2–xO endow Cu2–xO@Ti3C2 with significant in vitro anti-inflammatory effects. As a promising wound dressing, in vivo studies validated the high efficacy of Cu2–xO@Ti3C2@PVA in promoting hemostasis, exerting antibacterial activity, reducing inflammation, and accelerating the healing process of diabetic wounds. This innovative approach provides a comprehensive solution to the multifaceted challenges of diabetic wound healing and paves the way for improved clinical outcomes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Xing Qian,Zijing Wang,Zeyu Chen,Salah M. El-Bahy,Dongxiang Li,Lianjie Qin,Chunfang Li,Zeinhom M. El-Bahy,Jikuan Zhao
Copper is essential for human body because it plays an important role in various physiological processes, so the sensitive detection of Cu 2+ ions is a vital topic in human health and environment safe. In this work, green-emitting carbon quantum dots (CQDs) facilely synthesized by a microwave-assisted hydrothermal method were used as fluorescent probes for Cu 2+ detection. The CQDs showed a rapid and sensitive response to Cu 2+ with a color change and brightened fluorescence. The fluorescence enhancement of CQDs reaches 4.51-fold by 5 μM Cu 2+ as a typical “turn-on” strategy. A good linear relation of the fluorescence enhancement by Cu 2+ appears in a range of 0.1–1 μM Cu 2+ with a limit of detection (LOD) of 2.46 nM. Then, the enhanced fluorescence of Cu 2+ -CQDs could be rapidly decreased by EDTA via a quenching response (“turn-off”). A linear range of the fluorescence decrease and EDTA concentration is 1–10 μM with a LOD of 0.19 μM. The interference experiments for the detections of both Cu 2+ and EDTA show a high selectivity. The practical detections of both Cu 2+ and EDTA in actual water samples and spiked samples demonstrated good reproducibility and effective recovery rates. In addition, the Cu 2+ -CQDs even had a slow “turn-off” response to histidine over 20 natural amino acids. Overall, the CQDs-based “turn-on-off” detection methods with high sensitivity and selectivity in this work can be considered a promising new choice for the fluorescence analysis of Cu 2+ and EDTA.
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FUEL
·
2025
·
IF 7.5
Xinru Han,Rongyan Li,Fashe Li,Yaozong Duan,Hua Wang
Biodiesel has attracted widespread attention as a renewable energy source. However, the presence of metal ion contaminants in biodiesel can lead to a decrease in fuel oxidative stability performance and alter fuel physicochemical properties, greatly limiting its large-scale application. This study proposes an effective method to inhibit biodiesel oxidation catalyzed by Cu 2+ /Fe 2+ via complexation of metal ions by chelators. Two typical chelators (1-Hydroxyethylidene-1,1-diphosphonic acid, HEDP; 2-phosphonobutane-1,2,4-tricarboxylic acid, PBTCA) were tested for their capability to improve the oxidation stability of biodiesel. The addition of HEDP was able to counteract the undesirable catalyzed oxidation effects on biodiesel induced by both Cu 2+ and Fe 2+ , while PBTCA was only effective for the case induced by Fe 2+ . With 0.05% HEDP addition, the oxidation induction times of biodiesel samples contaminated by Cu 2+ and Fe 2+ were extended by about 12 and 20 times, respectively. For the case of 0.05% PBTCA addition, the oxidation induction time of Fe 2+ contaminated biodiesel sample was extended by about 20 times, while that of Cu 2+ contaminated biodiesel sample was only extended by about 37%. Fourier transform infrared spectroscopy analysis indicated that either the addition of HEDP or PBTCA has little effect on the chemical structure of biodiesel. Molecular dynamics calculations were then carried out to unravel the inhibitive mechanism of HEDP and PBTCA on biodiesel oxidation. The complexation of Cu 2+ /Fe 2+ by HEDP and PBTCA can block the chain branching pathways, reduce the generation of active radicals and thus inhibit biodiesel oxidation.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Shi-Ting Zhang,Panpan Li,Caiyun Liao,Tingting Luo,Xingming Kou,Dan Xiao
A ruthenium(II) bipyridyl complex conjugated with functionalized Schiff base (RuA) has been synthesized and functioned as a luminescent probe. The luminescence of RuA was greatly quenched by Cu 2+ due to its molecular coordination with paramagnetic Cu 2+ . Subsequently, the addition of l -Histidine can turn on the luminescence of the RuA-Cu(II) ensemble, which can be attributed to the replacement of RuA in RuA-Cu(II) ensemble by l -Histidine. On the basis of the quenching and recovery of the luminescence of RuA, we proposed a rapid and highly sensitive on-off-on luminescent assay for sensing Cu 2+ and l -Histidine in aqueous solution. Under the optimal conditions, Cu 2+ and l -Histidine can be detected in the concentration range of 5 nM–9.0 μM and 50 nM–30 μM, respectively, and the corresponding detection limits were calculated to be 0.35 and 0.44 nM (S/N=3), separately. The proposed luminescent probe has been successfully utilized for the analysis of Cu 2+ and l -Histidine in real samples (drinking water and biological fluids). Furthermore, the probe revealed good photostability, low cytotoxicity and excellent permeability, making it a suitable candidate for cell imaging and labeling in vitro.
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Nanoscale
·
2018
·Vol. 10
·期 30
·14546-14553
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IF 7.233
Dandan Xie,Bin Zhang,Aijuan Zhang,Yongjin Chen,Yanci Yan,Hengquan Yang,Guiwen Wang,Guoyu Wang,Xiaodong Han,Guang Han,Xu Lu,Xiaoyuan Zhou
(Ag,Sn) co-doped Cu3SbSe4 nanocrystals are obtained via a facile microwave-assisted solvothermal method, and their thermoelectric properties are investigated in the temperature range from 300 K to 623 K. Sn-doping on Sb sites dramatically increases the carrier concentration and thus the electrical conductivity, promoting the thermoelectric power factor. Further alloying with Ag on Cu sites strongly suppresses the lattice thermal conductivity close to the glass limit. Aside from point defect scattering, such reduction in lattice thermal conductivity largely relies on the formation of Cu2−xSe nanoinclusions, which serve as additional scattering centers for phonons. Overall, the sample with the nominal composition of Cu2.8Ag0.2Sb0.95Sn0.05Se4 reaches a minimum lattice thermal conductivity of 0.27 W m−1 K−1 and a maximum zT of 1.18 at 623 K, which is the best result for the Cu3SbSe4-based materials in the same temperature region. Our results demonstrate that the microwave-assisted synthesis method is capable of fabricating Cu based ternary compounds with high thermoelectric performance.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Haitao Ren,Yuqing Chen,Abdelkader Labidi,Ke Zhao,Xiaoqian Xu,Sarah I. Othman,Ahmed A. Allam,Hassan Ahmad Rudayni,Chuanyi Wang
Developing carbon quantum dots (CQDs) from bio-waste lignin for effectively detecting Cu 2+ is of great significance for promoting the value-added utilization of lignin resources. However, the limited amount of surface-active groups and low quantum yield of lignin-based CQDs hinder their application in this regard. Herein, bio-waste lignin was converted into value-added amine functionalized CQDs using a facile two-step hydrothermal approach. The as-synthesized CQDs modified with amino groups exhibit bright green fluorescence, abundant surface functional groups, high water solubility and uniform particle size (3.9 nm). Systematic analysis demonstrates that the rich NH 2 groups (~12.3 %) on the CQDs backbone improve their fluorescence properties (quantum yield increased from 3.4 % to 21.1 %) and specific detection ability for Cu 2+ . The developed NH 2 -CQDs serve as an efficient fluorescent probe , displaying high sensitivity and selectivity towards Cu 2+ in aqueous system, with a detection limit of 2.42 μmol/L, which is lower than the maximum permitted amount of Cu 2+ in drinking water (20 μmol/L). The detection mechanism of NH 2 -CQDs for Cu 2+ is attributed to the synergy of static quenching and photo-induced electron transfer . This study provides a valuable reference for the synthesis of high-quality fluorescent CQDs from lignin resources and the effective detection of trace Cu 2+ in aquatic environments.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Keting Feng,Kangqi Wu,Kai Li,Weijun Wang,Shihui Gao,Jun Fan,Tao Sun,Enzhou Liu
Localized surface plasmon resonance (LSPR) effect plays a crucial role in the field of solar energy utilization. In this work, we successfully prepared a Cu 2-x Se/ZnSe S-scheme heterojunction with a broad-spectrum response using the hot-injection and low-temperature water bath method. Importantly, we demonstrated that the photothermal effect induced by the LSPR of nonstoichiometric Cu 2-x Se can significantly improve the slow kinetics of water splitting, resulting in an apparent activation energy reduction from 50.1 to 28.7 kJ·mol −1 . This improvement is responsible for achieving the highest photocatalytic H 2 evolution rate of 63.6 mmol·g −1 ·h −1 over 2.7 % Cu 2-x Se/ZnSe under the wavelength ranged from 200 to 2500 nm, which is 3.4 and 5.6 times higher than that of ZnSe and Cu 2-x Se, respectively. Furthermore, the composite exhibits a remarkable H 2 production rate of 0.108 mmol·g −1 ·h −1 under near-infrared spectroscopy (800<λ<2500 nm), while ZnSe shows limited capability in H 2 releasing. Additionally, Cu 2-x Se/ZnSe demonstrates distinct photocurrent response when λ > 800 nm. The enhanced performance in H 2 evolution can be attributed to the synergistic effect of LSPR-induced light absorption and S-scheme heterojunction, which not only expands the light absorption range to the near-infrared region but also facilitates hot electron injection, charge carrier separation and transfer, leading to a faster surface reaction kinetics. This study provides an effective approach for designing a broad-spectrum light responsive non-precious metal-based photothermal-assisted photocatalytic system.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Bin Pan,Yang Jin,Yan Chen,Juan Wang,Kangnan Wang,Sunfang Chen,Mingyang Lei,Wenguo Cui,Junjie Li,Yu Qian
The widespread abuse of antibiotics has led to the emergence of drug-resistant bacterial strains, severely complicating the treatment of infectious wounds. Traditional therapies are often limited to antibacterial or anti-inflammatory approaches, making it challenging to manage both early-stage infection and later-stage tissue regeneration simultaneously. Herein, a Cu 2−x Se nanoparticles (CSNPs) spray containing mixed-valence copper ions, enabling the programmed healing of infectious wounds is developed through light-controlled cascade regulation. In the early infection stages, the copper ions released from CSNPs exert antibacterial effects via chemodynamic therapy (CDT), with their activity significantly enhanced under near-infrared (NIR) irradiation. At later stages, Cu 2+ /Cu + ions enter cells, interact with cysteine residues in KEAP1 protein, and induce conformational changes, triggering deubiquitinase activity and suppressing macrophage-driven inflammation. Findings from in vitro and in vivo studies consistently revealed that CSNPs efficiently depleted glutathione and enhanced H 2 O 2 breakdown, leading to the generation of •OH and O 2 •- under NIR exposure, which resulted in an MRSA elimination rate exceeding 99%. Mechanistically, CSNPs bind to KEAP1, removing the ubiquitin linkage from NRF2, thereby inhibiting inflammation. This CSNPs spray provides a dual synergistic effect of antimicrobial and tissue-regenerative properties, offering an innovative approach for treating antibiotic-resistant infections in wounds.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Min Hu,Yu Zhang,Yan Zhang,Meng Wang,Shanying Zhang,Jin Zhang,Congying Xu,Xiaoyu Liang
Pesticides are essential for controlling plant diseases and pests in modern agriculture, yet traditional formulations often suffer from poor adhesion, rapid UV degradation, and loss due to rainwater runoff. This study introduces Pro@TA-Cu 2+ -Pal, a novel pH-responsive release system designed to enhance the performance of prochloraz, a widely used fungicide. By integrating tannic acid and copper ions onto palygorskite, this nanocarrier with metal–phenolic networks improves prochloraz wettability and adhesion on leaf surfaces while significantly enhancing UV stability and rainfastness. Under UV exposure, Pro@TA-Cu 2+ -Pal showed a 3.9-fold lower degradation rate than the commercial emulsion-in-water formulation (Pro EW). In simulated rain tests, Pro@TA-Cu 2+ -Pal exhibited superior rain-fastness, retaining >80 % of the applied fungicide on leaf surfaces, whereas Pro EW showed a marked reduction in retention. Pot trials showed that Pro@TA-Cu 2+ -Pal provided excellent control against wheat powdery mildew, outperforming Pro EW in both protective and curative treatments, with more effective and sustained disease control. Importantly, Pro@TA-Cu 2+ -Pal proved safe with no phytotoxicity observed in the crop. These findings highlight the potential of Pro@TA-Cu 2+ -Pal as an economical, eco-friendly, and sustainable solution for improving pesticide efficiency, reducing environmental impact, and supporting long-term crop protection.
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