SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Miao An,Hui Li,Ming Su,Shu Gao,Ming Chen Wang,Shi Gang Shen,Zhong Feng Gao,Jiang Xue Dong
In this work, the water-soluble fluorescent Ag nanoclusters (DPA @ Ag NCs) were first prepared based on D-Penicillamine (DPA) as a stabilizer, however, the fluorescence quantum yield (QY) of DPA @ Ag NCs was very low, then Cu 2+ was employed to improve the fluorescence QY and the doped Ag nanoclusters with Cu 2+ (DPA @ Ag/Cu NCs) were obtained. The study showed that the QY increased fourfold and the emission of nanoclusters changed from red to yellow after addition of Cu 2+ . The reason for change of fluorescent properties was attributed to the change of self-assembly structures caused by adding Cu 2+ into reaction system, leading to the aggregation-induced emission enhancement (AIEE) effect and enhancing the band gap (Eg) between the HOMO and LUMO in nanoclusters. Subsequently, a fluorescent Ag + sensor with high sensitivity and selectivity was established based on the DPA @ Ag/Cu NCs as probes in aqueous solution. Experiments showed that the Ag + could significantly quench the fluorescence of DPA @ Ag/Cu NCs under experimental conditions, and there was a good linear relationship between the fluorescent intensity quenching value and Ag + concentration in the range of 0.05–800 μM, and the limit of detection (LOD) was 0.03 μM (3σ/k). Meanwhile, most of common ions had no effect on the experimental results under the same conditions. In addition, the sensor was successfully applied on the detection of Ag + in real water samples, and the recovery rate was 80.3–99.0%.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Shixue He,Chao Yang,Mingguang Niu,Dandi Wei,Shasha Chu,Mei Zhong,Jide Wang,Xintai Su,Lu Wang
Well-defined deposition of noble metal nanoparticles is attractive for the synthesis of heterogeneous metal catalysts with excellent activity, stability, and easy separability. Herein, a facile method combining surface coordination deposition with thermal decomposition has been proposed to fabricate Ag/CoFe 2 O 4 composites as magnetic catalysts for hydrogenation reduction of 4-nitrophenol and 2-nitroaniline. This method involved the adsorption of silver ions on cobalt-ferrous oxalate through the surface coordination, and then the thermal decomposition into Ag/CoFe 2 O 4 . The characterizations of XRD , SEM, FTIR, BET, VSM , XPS and Element mapping were utilized to reveal that Ag/CoFe 2 O 4 exhibited a magnetic saturation of 40.4 emu g −1 , a specific surface area of 58.8 m 2 g -1 , and an even distribution of metallic Ag on CoFe 2 O 4 particles. Catalytic reduction tests of 4-nitrophenol and 2-nitroaniline indicated that the Ag contents in Ag/CoFe 2 O 4 seriously affected the catalytic activity of the catalysts. Moreover, the durability test showed that Ag/CoFe 2 O 4 still preserved ∼74.6% of the initial catalytic activity even at the 20th run.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yu Qiu,Zhihao Sun,Zihao Guo,Jingyu Bi,Guangshen Li,Lei Qian
Herein, oxygen-deficient NH 4 V 4 O 10 micro-flowers with loaded Ag quantum dots and pre-intercalated Ag + (NVO-Ag) for aqueous zinc ion battery (AZIB) cathode materials were successfully synthesized by a one-step hydrothermal method. The reversible redox reaction between Ag + and Ag quantum dots, and the abundant Zn 2+ storage sites from oxygen vacancies provided capacity contributions for NVO-Ag. Meanwhile, the loaded Ag quantum dots, pre-intercalated Ag + and introduced oxygen vacancies synergistically optimized the electronic structure and distribution of NVO-Ag, promoting the transport of electrons in NVO-Ag. The pre-intercalated Ag + could also replace the NH 4 + in the interlayer of NH 4 V 4 O 10 , weakening the repulsion between the interlayer NH 4 + and Zn 2+ , which achieved rapid Zn 2+ diffusion kinetics. Moreover, the abundant oxygen vacancies in NVO-Ag could alleviate the strong electrostatic interaction between Zn 2+ and V-O framework, boosting the transmission of Zn 2+ in NVO-Ag. Finally, the structural stability of NH 4 V 4 O 10 micro-flowers was improved due to the high bonding strength between Ag + and V-O layers. Benefiting from the above effects, NVO-Ag-100 achieved excellent capacity performance (387.2 mAh g −1 at 0.5 A g −1 ), rate performance (178.9 mAh g −1 at 12 A g −1 ) and cycle stability (91.7 % capacity retention after 1700 cycles at 8 A g −1 ). This work provided effective ideas to achieve high-performance AZIB cathode materials.
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高影响因子
ChemCatChem
·
2024
·
IF 3.8
Hongyu Zhang,Shaojuan Zeng,Chongyang Jiang,Kuilin Peng,Jiaqi Feng,Lei Yuan,Xin Li,Fei Xu,Xiangping Zhang
The application of electrochemical CO2 reduction reaction (CO2RR) to generate value-added products, including carbon monoxide (CO), represents a sustainable strategy for addressing the global carbon balance. Silver (Ag) has gained significant attention as an attractive and cost-effective electrocatalyst for CO2RR-to-CO due to high activity. Here, the porous Ag nanofoam catalysts with Ag(111)-dominant were prepared by in-situ electrolysis-deposition method in the ionic liquid (IL) electrolyte. The Ag nanofoam catalysts exhibited exceptional activity in converting CO2 to CO, with a high Faradaic efficiency (> 95%) in a wide range of -1.9 ~ -2.4 V vs. Ag/Ag+ in the 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) electrolyte. The maximum CO partial current density of -125.40 mA cm-2 was obtained on this Ag nanofoam catalyst, representing 62% improvement over Ag(110)-dominant Ag electrode (-77.35 mA cm-2) at -2.4 V vs Ag/Ag+ in the [Bmim][BF4] electrolyte. Density functional theory calculations demonstrate that the Ag(111) crystal facet formed by in-situ electrolysis-deposition method prefers to adsorb [Bmim][BF4] which can stabilize the reaction intermediate, thereby weakening the reaction free energy and promoting CO2 electroreduction.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Zhuofan Han,Dengjie Zhong,Yunlan Xu,Haixing Chang,Lin Dong,Yi Liu
In this study, based on Ag@AgCl/tubular g-C 3 N 4 (Ag@AgCl/TCN) composite, Ag nanoparticles were deposited on its surface to form Ag nanofilm enhanced composite through photoreduction of excessive silver nitrate solution to obtain Ag nanofilm Ag@AgCl/TCN photocatalyst . Finally, Ag nanofilm Ag@AgCl/TCN/Ti photoanode was successfully prepared by silica-sol drop-coating method, and assembled with Cu 2 O/Cu cathode to construct a photocatalytic fuel cell (PFC). Ag nanofilm can not only enhance the light absorption and utilization of Ag@AgCl/TCN/Ti, but also extend its light response wavelength to visible light , and be used as an electron transfer medium to reduce internal resistance. The photocurrent density and the photoconversion efficiency of the Ag nanofilm/Ag@AgCl/TCN/Ti are 8.01 mA·cm −2 and 1.24%, respectively, which are 2.49 and 2.54 times those of the Ag@AgCl/TCN/Ti photoanode, respectively. The first-order kinetic constant and the maximum power density of the Ag nanofilm-coated Ag@AgCl/TCN/Ti-Cu 2 O/Cu PFC system are 0.064 min −1 and 46.37 μW·cm −2 , respectively, which are 1.39 and 1.94 times those of the Ag@AgCl/TCN-Cu 2 O/Cu PFC system, respectively. In addition, it degraded more than 95% of rhodamine B, 72.68% of tetracycline and 54.25% of bisphenol A within 60 min. The excellent performance of Ag nanofilm/Ag@AgCl/TCN/Ti-Cu 2 O/Cu is due to the strengthening of Ag nanofilm and the formation of S-type heterojunctions between AgCl and TCN. Free radicals (•Cl, h + , •OH, •O 2 - ) and non-radicals ( 1 O 2 ) are involved in the degradation reaction of RhB degradation. It is worth noting that 6% Ag nanofilm/Ag@AgCl/TCN/Ti-Cu 2 O/Cu has a positive effect on the production of •O 2 - , and its output is approximately 1.89 times that of the Ag@AgCl/TCN/Ti-Cu 2 O/Cu. A series of material characterization experiments have been completed and possible mechanisms of operation have been proposed. This study provides a new scheme for the design and preparation of high-efficiency photoanode of PFC.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Ruyan Xie,Shuzhe Zhang,Yanhua Song,Xiaozhen Zhang,Shihou Sheng,Haifeng Zou
The optical properties of quantum dots are significantly influenced by photoactivation. However, the progress in the development of photoactivation carbon dot (CDs) is still stagnant. Herein, a method for preparing photoactivated CDs/NiFe 2 O 4 by introducing affluent defects onto the surface of CDs through modification with NiFe 2 O 4 , extremely filling the gap of photoactivated CDs is proposed. Interestingly, a fantastic fluorescence detection strategy in a unique “OFF-ON-OFF” mode, combined with Ag + -assisted fluorescence enhancement, to establish a dual-channel regulation mechanism for ultra-sensitive detection of Hg 2+ is first proposed. By increasing surface traps and non-radiative recombination, defect-induced manipulation on the surface of CDs creates favorable conditions for enhancing photoactivation capacity. Unexpectedly, the CDs/NiFe 2 O 4 shows a 25-fold enhancement in fluorescence intensity after exposure to UV-lamp. Compared to CDs/NiFe 2 O 4 , Ag + -assisted photoactivation CDs/NiFe 2 O 4 exhibits superior selectivity and sensitivity for Hg 2+ detection, with low detection limits of 0.7 nM. Moreover, TiO 2 @CDs/NiFe 2 O 4 catalyst is successfully prepared by anchoring CDs/NiFe 2 O 4 onto the surface of TiO 2 , which demonstrates efficient degradation of tetracycline within 90 min under visible light irradiation, with a degradation rate of 98.3%. This work first provides a novel defects modification strategy for developing highly active photoactivated CDs technology that is significant for future environmentally sensitive applications.
研究领域:
材料科学
·
环境科学
·
分析化学
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 47
·29368-29377
·
IF 3.108
Keling Chen,Kenan Xie,Qin Long,Lijun Deng,Zhiqiang Fu,Huanhuan Xiao,Lu Xie
Silver nanoparticles (Ag-NPs) are a type of crucial bactericide due to their excellent antibacterial properties. However, the application of Ag-NPs in clinics and in bone tissue engineering is hampered because of their unabiding antibacterial efficacy and undesirable biological properties such as cytotoxicity and inferior hemocompatibility. In this study, Ag-NPs were modified with polydopamine (pDA) and hydroxyapatite (HAp) to prepare novel and multifunctional core (Ag-NPs)–shell (pDA)–shell (HAp) nanoparticles (Ag@pDA@HAp-NPs). The Ag+ release rate was reduced by about 80% on the first day, and then Ag+ was slowly released, which implied that the core–shell Ag@pDA@HAp-NPs could effectively control the release of Ag+. The core–shell Ag@pDA@HAp-NPs could obviously inhibit the growth of E. coli and S. aureus, and the bactericide rate of the Ag@pDA@HAp-NPs was up to 99.99% after being cultured for 24 h. Furthermore, the synthesized Ag@pDA@HAp-NPs exhibited superior hemocompatibility due to the favorable blood compatibility of the pDA coating and HAp shell as well as the controlled release of Ag+. Thus, the core–shell Ag@pDA@HAp-NPs, with the ability for the controlled release of Ag+ and superior hemocompatibility, are promising for reducing cytotoxicity and achieving long-term antibacterial properties, and could have potential applications in clinics and in bone tissue engineering.
研究领域:
材料科学
·
生物医学工程
·
纳米医学
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DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Minghui Cao,Minqiang Wang,Le Li,Hengwei Qiu,Muhammad Amin Padhiar,Zhi Yang
Wearable sensors with high sensitivity, fast response and recovery are highly desirable for many new application fields. Herein, we synthesized the cotton fiber which coated with reduced graphene oxide doped with silver nanowire (rGO-Ag NW@cotton fiber) via a simple and environmentally friendly hydrothermal method . The flexible and wearable rGO-Ag NW@cotton fiber based piezoresistive sensor was fabricated with the orientation of face-to-face, where the cotton fiber coated with reduced graphene oxide (rGO@cotton fiber) was used as the lower part of the sensor. The addition of silver nanowire (Ag NW) provides a faster and more convenient channel for charge transfer, resulting in the greatly improvement of the performance, showing the high sensitivity, accompanied with the fast response and relaxation properties. With the effectively wrapping and protection of reduced graphene oxide (rGO), Ag NW was well protected and avoid being oxidized by the air, which contributes significantly to the excellent stability of the sensor. Under the synergistic effect of Ag NW and rGO, rGO-Ag NW@cotton fiber based piezoresistive sensor can be well used in detecting human activities such as finger pressing, bending, twisting, walking and pulse waves, showing high sensitivity, fast response, fast recovery and high stability. These results indicate that the rGO-Ag NW@cotton fiber based piezoresistive sensor has an enormous potential for application in the flexible and wearable pressure sensors.
研究领域:
材料科学
·
生物医学工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Min Chen,Lixue Xu,YanMin Wang
Metacomposites that have tunable negative permittivity show broad application potential in the domain of electromagnetics. In this study, the impregnation method was employed to successfully synthesize and impregnate silver (Ag) and silica-coated Ag (Ag@SiO₂) nanoparticles into a carbon cloth (CC) matrix. The content ratio of Ag and Ag@SiO₂ was regulated to adjust the negative permittivity of the composites. The results showed that a conductive network gradually formed in the composites and plasma oscillations occurred with the increase of Ag content, which thereby increased alternating current (AC) conductivity and the absolute values of negative permittivity. After Ag@SiO 2 nanoparticles were added, however, the conductive network was disrupted, which reduced electrical conductivity. Ag@SiO₂ regulated the frequency dispersion behavior of negative permittivity through Lorentz resonance. Thus, negative permittivity and frequency responses were successfully adjusted via the adjustment of the ratio between the inductive (Ag) and the capacitive (Ag@SiO₂) components in the composites. The findings offer a novel approach for designing lightweight metacomposites with precisely adjustable negative permittivity and frequency response characteristics.
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高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2026
·Vol. 36
·期 3
·988-999
·
IF 5.5
Qing-song LI,Bin YANG,Yang TIAN,Bao-qiang XU,Wen-long JIANG,Yuan GAO,Zong-kui JIANG
The modified molecular interaction volume model (M-MIVM) was used to calculate the activity values and their deviations from experimental data for Ag−Cu and Ag−Sb binary alloys. Subsequently, theoretical vapor−liquid equilibrium phase diagrams ( T − x − y and p − x − y ) were plotted via combining M-MIVM and vacuum theory. The vapor−liquid phase equilibrium (VLE) experiments were conducted on the Ag−Cu alloy at 1500−1560 K and 10−15 Pa and Ag−Sb alloys at 950−1350 K and 10 Pa. The results showed that the average relative deviation and average standard deviation of activity were lower than 5% and 0.02, respectively. A comparison of theoretical and experiment results for VLE revealed that the simulated data on the T − x − y diagram were well consistent with experimental values. Therefore, the VLE phase diagrams can serve as a guide in vacuum separation experiments and industrial production for Ag−Cu and Ag−Sb binary alloys.
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高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 18
·1443
·
IF 4.3
Shicheng Liu,Na Li,Qulan Zhou
Elucidating the mechanisms of CO2photocatalytic conversion systems is crucial for tackling the challenges of carbon neutrality. In this study, a series of Ag@g-C3N4photocatalysts were constructed with metal particle size modulation as the core strategy to systematically reveal the modulation mechanism of Ag nanoparticles (Ag NPs) size variation on the selectivity of CO2photoreduction products. Systematic characterizations revealed that increasing Ag size enhanced visible light absorption, promoted charge separation, and improved CH4selectivity. Photocatalytic tests showed Ag3.0%@CN achieved optimal activity and electron utilization. Energy band analyses indicated that Ag modification preserved favorable conduction band positions while increasing donor capacity. Further density-functional theory (DFT) calculations reveal that Ag NPs size variations significantly affect the adsorption stability and conversion energy barriers of intermediates such as *COOH, CO and CHO, with small-sized Ag7NPs favoring the CO pathway, while large-sized Ag NPs stabilize the key intermediates and drive the reaction towards the CH4pathway evolution. The experimental and theoretical results corroborate each other and clarify the dominant role of Ag NPs size in regulating the reaction path between CO and CH4. This study provides mechanistic guidance for the selective regulation of the multi-electron reduction pathway, which is of great significance for the construction of efficient and highly selective CO2photocatalytic systems.
研究领域:
材料化学
·
光催化
·
环境科学
·
能源化学
·
纳米材料
·
表面科学
·
物理化学
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PubMed
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Yi Yuan,Wen-Long Wang,Zhi-Wei Wang,Jin Wang,Qian-Yuan Wu
Carbon nitride has been extensively used as a visible-light photocatalyst, but it has the disadvantages of a low specific surface area, rapid electron–hole recombination, and relatively low light absorbance. In this study, single-atom Ag was successfully anchored on ultrathin carbon nitride (UTCN) via thermal polymerization, the catalyst obtained is called AgUTCN. The Ag hardly changed the carbon nitride's layered and porous physical structure. AgUTCN exhibited efficient visible-light photocatalytic performances in the degradation of various recalcitrant pollutants, eliminations of 85% were achieved by visible-light irradiation for 1 hr. Doping with Ag improved the photocatalytic performance of UTCN by narrowing the forbidden band gap from 2.49 to 2.36 eV and suppressing electron–hole pair recombination. In addition, Ag doping facilitated O 2 adsorption on UTCN by decreasing the adsorption energy from −0.2 to −2.22 eV and favored the formation of O 2 ·− . Electron spin resonance and radical-quenching experiments showed that O 2 ·− was the major reactive species in the degradation of Acetaminophen (paracetamol, APAP).
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