JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
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IF 2.2
Runmian Ming,Cailing Zhang,Liangbo Xie,Jing Chang,Yi Li
Although gold (Au) plays an important role in many fields, the residual Au3+ ion in our natural environment is one of the most noxious heavy metal ions for animals and plants. It is of great significance to develop an efficient and simple detection method for Au3+. Based on heterogeneous catalytic activation of peroxymonosulfate (PMS) by Ag@Cu2O nanoparticles (Ag@Cu2O NPs), a novel, visible and convenient strategy for Au3+ detection was developed. The well-dispersive Ag@Cu2O NPs could catalyze PMS to produce sulfate radicals (SO4•−) and hydroxyl radicals (·OH) which could oxide 3, 3′, 5, 5′-tetramethylbenzidine (TMB) into oxidized TMB (oxTMB) in colorimetric detection. The introduced Au3+ could effectively enhance catalytic activation of PMS to produce more SO4•− and ·OH. This was because there was the synergistic effect of Au and CuO, which reduced the charge transfer resistance and promoted electron transfer. This method had good specificity against 22 types of cationic or anionic interfering ions and the detection limit of Au3+ was about 290 nmol·L−1. In this study, a new substrate of PMS was used for colorimetric detection of heavy metal ions, and the catalytic synergy of Au and CuO in PMS/Ag@Cu2O NPs/Au3+ colorimetric detection system was analyzed in detail.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 14
·期 5
·813-823
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IF 3.552
Wang Mengyun,Zhang Shengbo,Li Mei,Han Aiguo,Zhu Xinli,Ge Qingfeng,Han Jinyu,Wang Hua
Novel, hierarchical, flower-like Ag/Cu 2 O and Au/Cu 2 O nanostructures were successfully fabricated and applied as efficient electrocatalysts for the electrochemical reduction of CO 2 . Cu 2 O nanospheres with a uniform size of ∼180 nm were initially synthesized. Thereafter, Cu 2 O was used as a sacrificial template to prepare a series of Ag/Cu2O composites through galvanic replacement. By varying the Ag/Cu atomic ratio, Ag 0.125 /Cu 2 O, having a hierarchical, flower-like nanostructure with intersecting Ag nanoflakes encompassing an inner Cu 2 O sphere, was prepared. The as-prepared Ag x /Cu 2 O samples presented higher Faradaic efficiencies (FE) for CO and relatively suppressed H 2 evolution than the parent Cu 2 O nanospheres due to the combination of Ag with Cu 2 O in the former. Notably, the highest CO evolution rate was achieved with Ag 0.125 /Cu 2 O due to the larger electroactive surface area furnished by the hierarchical structure. The same hierarchical flower-like structure was also obtained for the Au 0.6 /Cu 2 O composite, where the FE CO (10%) was even higher than that of Ag 0.125 /Cu 2 O. Importantly, the results reveal that Ag 0.125 /Cu 2 O and Au 0.6 /Cu 2 O both exhibit remarkably improved stability relative to Cu 2 O. This study presents a facile method of developing hierarchical metal-oxide composites as efficient and stable electrocatalysts for the electrochemical reduction of CO 2 .
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2015
·Vol. 58
·期 5
·881-888
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IF 1.192
Yang AiLing,Li ShunPin,Wang YuJin,Wang LeLe,Bao XiChang,Yang RenQiang
Ag@Cu 2 O core-shell metal-semiconductor nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Ag@Cu 2 O core-shell NPs were easily converted to Ag@Cu bimetallic core-shell NPs with the help of surfactant PVP and excessive reducer ascorbic acid in air at room temperature, which is a unique phenomenon. Varying volumes of Ag colloidal solutions were added into the reaction mixtures containing fixed initial concentrations of Cu 2+ and PVP, Ag@Cu 2 O and Ag@Cu core-shell NPs with fixed core size but varying outer shell thicknesses could be obtained. The composites, structures, morphologies and extinction properties of Ag@Cu 2 O and Ag@Cu core-shell NPs were systematically characterized by XRD, TEM and extinction spectra. Both of these NPs show wide tunable optical properties. The extinction peaks could be shifted from 421 nm to 700 nm. FTIR results reveal that Cu + ions on the surface of Cu 2 O nanocrystalline coordinate with N and O atoms in PVP and further are reduced to metallic Cu by excessive ascorbic acid and then form a nucleation site on the surface of Cu 2 O nanocrystalline. PVP binds onto a different site to proceed with the reduction until all the Cu sources in Cu 2 O NPs are completely assumed. And the shell of Cu 2 O is converted to Cu shell. The synthesis approach in this paper is simple and also a promising reference for synthesizing other core-shell NPs. Ag@Cu 2 O NPs can be easily converted to Ag@Cu NPs in air at room temperature, which is promising to be used in electronic devices.
研究领域:
纳米材料化学
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无机功能材料
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胶体与界面化学
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光谱学
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半导体物理
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Qiaoyue Xi,Ge Gao,Manyu Jin,Yanqun Zhang,Hua Zhou,Cunqi Wu,Yongxia Zhao,Lidan Wang,Pengran Guo,Jingwei Xu
A novel ternary photocatalytic nanocomposite, Ag–Cu 2 O/C 3 N 4 , has been successfully synthesized via a facile two-step reduction procedure at room temperature, wherein Ag nanoparticles are directly growing on the surface of Cu 2 O supported by C 3 N 4 nanosheets. The resulting ternary Ag–Cu 2 O/C 3 N 4 photocatalyst exhibits enhanced photocatalytic activity towards methyl orange (MO) degradation compared with its counterparts (Cu 2 O, spherical Ag–Cu 2 O and Cu 2 O/C 3 N 4 ), demonstrating a removal rate of MO up to 95.7% within 30 min. The enhanced photocatalytic activity can be ascribed to the following factors: (1) the surface plasmon resonance effect of Ag nanoparticles broadening the visible light response of Cu 2 O; (2) the introduction of C 3 N 4 functioning not only as a fast electron delivery but also a fine stabilizer to prevent the Ag–Cu 2 O composite from agglomeration. Mechanism studies reveal that MO is cracked into smaller fragments and the h + is the main reactive species participating in the photocatalytic process. Moreover, the Ag–Cu 2 O/C 3 N 4 photocatalyst also shows high photodegradation ability for another two representative azo dyes, acid orange II and congo red. This study demonstrates the potential of Ag–Cu 2 O/C 3 N 4 in the degradation of azo dyes and also provides a guide to design of Cu 2 O-based ternary photocatalysts for further wastewater remediation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Yue Guo,Hai Wang,Xiaowei Ma,Jing Jin,Wei Ji,Xu Wang,Wei Song,Bing Zhao,Chengyan He
Highly sensitive biosensors are essential in medical diagnostics, especially for monitoring the state of an individual’s disease. An ideal way to achieve this objective is to analyze human sweat secretions by noninvasive monitoring. Due to low concentrations of target analytes in human secretions, fabrication of ultrasensitive detection devices is a great challenge. In this work, Ag–Cu2O/reduced graphene oxide (rGO) nanocomposites were prepared by a facile two-step in situ reduction procedure at room temperature. Ag–Cu2O/rGO nanocomposites possess intrinsic peroxidase-like activity and rapidly catalyze oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2. On the basis of the excellent SERS properties and high peroxidase-like activity of the Ag–Cu2O/rGO nanocomposites, the catalytic oxidation of TMB can be monitored by SERS. This approach can detect H2O2 and glucose with high sensitivity and distinguish between diabetic and normal individuals using glucose levels in fingerprints. Our work provides direction for designing other SERS substrates with high catalytic activity and the potential for application in biosensing, forensic investigation, and medical diagnostics.
研究领域:
材料科学
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 7
·3831-3842
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IF 2.047
Zhang Baozhong,He Jintao,Tian Panpan,Lv Lina,Zhu Huina,Xie Lingling,Liu Xiaolong,He Baoshan
In this study, based on the specific binding of nucleic acid aptamers (Apts) to 3,3′,4,4′-tetrachlorobiphenyl (PCB77), an ultrasensitive electrochemical aptasensor was constructed for the detection of PCB77. The Apts were captured by hairpin (HP) deoxyribonucleic acid capture probes through complementary base pairing. The large surface area of reduced graphene oxide (rGO) combined with Ag-Cu 2 O significantly improved the efficiency of electron transfer on the electrode surface and provided a large number of binding sites for HP capture probes. Streptavidin (SA)-modified CeO 2 /AuPt was used as signal-generating material to amplify electrical signals cooperatively with Ag-Cu 2 O/rGO, and it was also combined with biotin-modified nucleic acid Apts via the SA-biotin system to form signal labels, which significantly improved the sensitivity of the aptasensor. The morphology and size of the synthesized materials were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The internal structure and composition of the materials were further analyzed by x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. The sensor assembly process was confirmed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Differential pulse voltammetry (DPV) was used to optimize the experimental conditions and evaluate the performance of the sensor. Under optimal conditions, the detection limit of the aptasensor was 0.069 ng/L, and the dynamic range was 0.1–10 3 ng/L, providing a high-quality platform for PCB77 detection. Graphical Abstract
研究领域:
分析化学
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环境科学
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纳米技术
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电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Jianhao Li,Zhicheng Hu,Shuhuan Han,Dapeng Cao,Xiaofei Zeng,Jianfeng Chen
Electrocatalytic CO 2 reduction reaction (CO 2 RR) to multi-carbon product, especially for ethylene (C 2 H 4 ), provides a favorable pathway for carbon neutrality and renewable energy storage. However, the second-order C-C coupling reactions in CO 2 RR need always the high activation/driven energy in dynamics originating from the trace C 1 intermediate product. Herein, we synthesized the Ag-decorated Cu 2 O porous hollow core-shell catalyst named Ag@Cu 2 O where Ag nanoparticles uniformly distributed on inner the surface of the hollow Cu 2 O (H-Cu 2 O) via the sacrificial template method. Benefiting from the synergistic hollow structure and electron transfer from Cu and Ag to O, Ag@Cu 2 O catalyst delivers the excellent C 2 H 4 Faradaic Efficiency (FE) of 55 % ± 2 % at −1.0 V (vs. RHE), which is superior to the most reported catalysts. More importantly, in situ infrared spectroscopy and density functional theory (DFT) calculations reveal the introduction of Ag can decrease the activation energy required for *CO and C-C coupling.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
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2015
·
IF 0
Junwei Fu,Shaowen Cao,Jiaguo Yu
Photocatalytic hydrogen generation is one of the most promising solutions to convert solar power into green chemical energy. In this work, a multi-component TiO 2 –Ag–Cu 2 O composite was obtained through simple impregnation-calcination of Cu 2 O and subsequent photodeposition of Ag onto electrospun TiO 2 nanotubes. The resulting TiO 2 –Ag–Cu 2 O photocatalyst exhibits excellent photocatalytic H 2 evolution activity due to the synergetic effect of Ag and Cu 2 O on electrospun TiO 2 nanotubes. A dual Z-scheme charge transfer pathway for photocatalytic reactions over TiO 2 –Ag–Cu 2 O composite was proposed and discussed. This work provides a prototype for designing Z-scheme photocatalyst with Ag as an electron mediator.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Weiqian Cai,Youqun Wang,Linshan Xiong,Yingjie Zheng,Zhibin Zhang,Xiaohong Cao,Yunhai Liu
Cuprous oxide (Cu 2 O), a promising semiconductor material, has been less employed in the photocatalytic removal of uranium. In this work, silver and gold nanoparticles were introduced on the surface of Cu 2 O. HR-TEM, XRD and XPS were applied in characterized the physic-chemical properties of composite. In comparison to Cu 2 O, Au modified Cu 2 O (Au/Cu 2 O-N) demonstrated a significantly enhanced uranium removal rate, reaching 100% within 120 minutes. This represents a 2-fold increase in the uranium removal rate compared to pure Cu 2 O-N. The reason con be interpreted including the red-shift of the absorption band from 600nm-800nm, the formation of Schottky junction between Au and Cu 2 O, the electron traps constructed by Au itself. Consequently, the rate of photogenerated electron-hole complexation is significantly diminished. Free trapping and EPR prove that reactive radicals are O 2 - . This has led to the development of a novel approach, namely the synergistic strategy of noble metal loading and nitrogen-doped cuprous oxide, which has the potential to facilitate the visible light removal of U(VI) from toxic wastewater.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xiao-Jian Li,Xinli Lu,Yunxia Wang,Zhanquan Zhang,Yongfa Zhang
This study successfully developed a highly sensitive electrochemiluminescence (ECL) sensor based on the ECL resonance energy transfer mechanism for detecting the key biomarker of acute myocardial infarction, heart–type fatty acid binding protein (h–FABP). Through the meticulous design of the Ag/Cu2O/Ti3C2 ternary nanocomposite material, this material demonstrated significant catalase–like catalytic activity, enabling the efficient decomposition of H2O2 to generate more superoxide radicals (O₂•⁻), thereby significantly enhancing the ECL signal of the luminol–H2O2 system. Notably, AgS quantum dots (AgS QDs), due to broad–spectrum ultraviolet absorption overlapping with the ECL emission spectrum of luminol, triggered an efficient energy resonance transfer effect, resulting in the decrease of ECL intensity. NH2–MIL–101(Fe) was utilized to couple with AgS QDs (AgS QDs@NH2–MIL–101(Fe)), which can further enhance the quenching efficiency. Based on this signal–off strategy, an ultrasensitive detection platform for h–FABP was successfully constructed. Experimental results indicated that the immunosensor exhibited an excellent response relationship within a wide linear range from 1.00 fg mL–1 to 100 ng mL–1, and a low detection limit reached 0.36 fg mL–1 (S/N = 3). This study provides an innovative methodological approach for ultra–trace detection of myocardial injury markers and demonstrates significant application potential in early clinical diagnosis.
研究领域:
分析化学
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生物传感器
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纳米技术
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生物化学
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临床诊断
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心血管研究
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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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.
研究领域:
电化学
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催化
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材料科学
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二氧化碳还原
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能量转换
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表面化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）