ENVIRONMENTAL RESEARCH
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2025
·
IF 7.7
Zhili Chen,Li Huang,Xingmeng Zhou,Yunxiang Zhang,Xin Chen,Chenliang Zhou,Hazem Abdelsalam,Wei Chen,Zhongjie Wang,Qinfang Zhang
Metal cluster co-catalysts have been widely considered as an effective strategy to address the energy crisis and environmental problems owning to the efficient light absorption and the enhanced separation of electron hole pairs. In this contribution, via a facile in-situ photoreduction technique, the Ag/(BiO) 2 CO 3 composites were synthesized to degrade the antibiotic pollutant tetracycline (TC). The incorporation of silver (Ag) clusters on (BiO) 2 CO 3 surface can form the built-in electric field (IEF) at the Mott-Schottky junction interface and facilitate the migration of photo-generated electrons from (BiO) 2 CO 3 to Ag clusters. Simultaneously, the synergy of local surface plasmon resonance (LSPR) effect also strengthens the light absorption capacity, and finally improving photocatalytic activities of composite materials. The optimal Ag/(BiO) 2 CO 3 composites exhibit excellent TC degradation, which is approximately 6.7 times than that of the pure (BiO) 2 CO 3 . Eventually, the potential degradation pathway of TC is proposed and the toxicity of the intermediates is also evaluated. This work motivates the design of highly efficient metal cluster co-catalysts and widens their potential applications in the environmental remediation.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chaochen Chen,Fang Lei,Ying Shi,Jianjun Xie,Lei Zhang,Lingcong Fan
The surface metallization of Si 3 N 4 ceramics with the Ag–Cu conductive paste containing CuO was systematically investigated. The interfacial reactions between CuO and Si 3 N 4 promoted the surface metallization of the ceramic substrate in an argon atmosphere. The effects of Ag and Cu relative contents on the evolution of the thick film surface morphology were studied. The electrical properties and tensile strength of composite ceramic substrates were enhanced through the generation of Ag–Cu eutectic solution within the thick film layer. The effect of brazing time on the properties of Ag–Cu/Si 3 N 4 composite ceramic substrates was investigated. Mechanical testing and scanning electron microscopy (SEM) were used to analyze the interface tensile strength of the Ag–Cu/Si 3 N 4 composite substrates and the morphology of the Ag–Cu film, and the bonding mechanism of the composite ceramic substrate was studied. When the sample was brazed at 800 °C for 20 min, the maximum tensile strength of 23.6 MPa between the Ag–Cu film and ceramic substrate was obtained, the lowest resistivity of 6.22 μΩ•cm was obtained. The bonding interface between thick film layer and the ceramic substrate formed the Ag–Cu mechanical structure was benefit for improving the comprehensive performance of the Cu/Si 3 N 4 composite ceramic substrate.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Ying Li,Kang Liu,Xin Li,Xuan Jin,Jinze Lyu,Yuebing Xu,Haiyan Zhu,Gang Shi
It is difficult for metal-modified semiconductor nanotubes to obtain surface-enhanced Raman scattering (SERS) substrates through long-range ordered 3D assembly, which adversely affects both Raman signal enhancement and Raman signal uniformity. Here, ZnFe 2 O 4 nanotubes with Ag nanoparticles modified on the inner and outer walls are induced to grow on the surface of the ordered Si pyramid by ZnO nanonedles as sacrificial templates. In this way, the composite nanotubes (Ag/ZnFe 2 O 4 ) are assembled into dandelion flower-like 3D aggregates with a periodic arrangement of hexagonal close packing. This 3D ordered SERS substrate based on Ag/ZnFe 2 O 4 nanotubes has excellent anti-reflective performance and carrier separation ability, which is conducive to the enhancement of Raman signal. When the SERS substrate is used as a sensor, it can achieve the single molecule (10 −13 M) detection level of Rhodamine 6 G, the enhancement factor (EF) is 3.14 × 10 9 , and the linear fit (R 2 ) of quantitative analysis is as high as 0.998 from 10 −13 to 10 −4 M. Meanwhile, the long-range ordered arrays on the SERS substrate can ensure the signal uniformity of sensor, which relative standard deviation (RSD) is as low as 3.37 %. In addition, the photocatalytic self-cleaning capability of SERS substrate ensures that the sensor can be reused. Finally, the mechanism of the photogenerated carrier migration of Ag/ZnFe 2 O 4 and its contribution to Raman signal enhancement were analyzed.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 4
·1-12
·
IF 5.3
Wu Wei,Han En,Ma Lixin,Zhou Ruiyun,Wang Chen,Bai Junwen,Cai Jianrong
A label-free surface-enhanced Raman scattering (SERS) sensor using optimal bimetallic Au@Ag nanocuboids (Au@Ag NCs) was developed for ultrasensitive detection of florfenicol residue in eggs. The Raman characteristic peaks of florfenicol detection were identified at 1145 cm −1 and 1595 cm −1 which were consistent with the theoretical Raman spectrum of florfenicol calculated by density functional theory. The Au@Ag NCs were optimized by changing the aspect ratio of Au nanorods and the thickness of Ag nanocuboids, achieving an enhancement factor of 1.69 × 10 6 for SERS signals. Under optimal conditions, the label-free SERS sensor demonstrated a broad linear range of 0.01 mg/kg to 100 mg/kg for florfenicol in real sample. The limit of detection of florfenicol in eggs was as low as 0.0410 μg/kg, and the recovery was 94.83% ~ 108.24%. Therefore, this label-free SERS sensor offers a rapid and sensitive approach for the trace detection of florfenicol residues in food safety monitoring. Graphical abstract
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Surfaces and Interfaces
·
2024
·
IF 5.7
Zhixiu Yang,Xiaoxuan Guo,Yong Chen,Lijing Gao,Ruiping Wei,Guomin Xiao
Modulating the surface microenvironment is crucial in strengthening C C coupling, leading to increasing selectivity in the production of multi-carbon (C 2+ ) products during CO 2 electroreduction. Herein, we have concentrated on investigating how to control the effect of surface distribution of active components of a series of Ag-decorated CuO , denoted as xAg/yCuO. These catalysts with similar chemical elements and morphology are designed, but they exhibit different selectivity in the CO 2 electroreduction process. As a result, the Ag particles in 3Ag/CuO aggregates, while the Ag in 2Ag/2CuO and Ag/3CuO is uniformly distributed on the flower-like CuO nanosphere . Besides, 3Ag/CuO has the highest Faraday efficiency (FE) of CO with a value of 30.9 % at 0.8 V vs. RHE, demonstrating rich-Ag catalysts are beneficial to produce CO. 2Ag/2CuO shows excellent FE C2H4 of 51.4 % at -1.2 V vs. RHE due to the highly dispersed distribution of Ag on the flower-like CuO and higher vacancy O. Ag/3CuO exhibits higher FE H2 compared to other catalysts across a wide potential range, and its minimal impedance is attributed to its exceptional performance in the hydrogen evolution reaction . The proposed reaction pathway for the most effective catalysts 2Ag/2CuO, as determined by in-situ attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS), involves the following steps: CO 2 →*CO 2 − → *COOH → *CO→ *CHO→ *OCHCHO→ *OCHCH 2 → C 2 H 4 . These findings demonstrate that controlling the surface structure can influence the local environment to enhance the efficiency of CO 2 electroreduction.
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TALANTA
·
2024
·
IF 5.6
Yan Su,Pengfei Gao,Guomei Zhang,Ying Zhou,Lihong Shi,Jianlin Wu,Wenting Liang,Shaomin Shuang,Yan Zhang
In this study, the N-Acetyl- l -Cysteine (NAC)-capped gold and silver bimetallic nanoclusters (NAC@Au–Ag NCs) was synthesized by reflux method. Due to the silver effect, the NAC@Au–Ag NCs exhibited strong photoluminescence at far-red/near-infrared regions and better catalytic performance than Au or Ag NCs. Upon addition of H 2 S, the Au–Ag NCs exhibited obvious fluorescence quench and color changes through the generation of metal sulfides and a static quenching process. The Au–Ag NCs displayed a wide linear luminescence response for H 2 S (18.5–217 μmol/L) with a detection limit of 0.269 μmol/L. Moreover, the visible color of Au–Ag NCs changed from white to brown-yellow along with increased H 2 S, the corresponding RGB values also displayed good linearity with the concentration of H 2 S (90.1–678 μmol/L). Notably, the fabrication of test strips provided a convenient and intuitive tool to screen the freshness of eggs by the color change of test strips. Au–Ag NCs could be used for living HeLa cells bioimaging and recognition of H 2 S abnormalities. Furthermore, it can be used as a catalyst to reduction of nitrophenols (NPhs), specific included 2NP, 3NP and 4NP. The reaction was regarded as a pseudo-first-order kinetic reaction due to the presence of excess NaBH 4 . At 298K, the catalytic rate constants(k) of 2NP, 3NP and 4NP were 0.1754 min −1 , 0.1734 min −1 and 0.2782 min −1 , respectively. The NAC@Au–Ag NCs catalyst still showed good catalytic activity and reusability after five cycles. Therefore, this study developed a H 2 S sensor for food samples and biological systems. And this nanocatalyst had great application potential for removed the nitrophenol pollutants in water.
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TALANTA
·
2017
·
IF 4.162
Shuo Li,Qiong Wu,Pinyi Ma,Yue Zhang,Daqian Song,Xinghua Wang,Ying Sun
A novel surface plasmon resonance (SPR) biosensor based on hollow gold nanospheres (HGNPs) and an improved sandwich assay was developed to detect rabbit IgG. The electromagnetic coupling between the HGNPs and Au film, and the notable plasmonic fields spread over the inner and outer surfaces of HGNPs, led to the considerable amplification of the SPR signal. [email protected] 3 O 4 /reduced graphene oxide ( [email protected] 3 O 4 /rGO) was introduced to bind detection antibody (Ab 2 ) to form the improved sandwich structure. Ag nanoparticles were excited to produce SPR and their hot electrons were doped on graphene thin films, which amplified the response of biomolecules. Magnetic nanoparticles (Fe 3 O 4 ) simplified the collection of Ab 2 [email protected] 3 O 4 /rGO. An external layer of polydopamine (PDA) permitted the efficient immobilization of Ab 2 without activation via abundant functional groups and protected the nanoparticles from etching or agglomeration. In addition, because of its large mass, Ab 2 [email protected] 3 O 4 /rGO also played a key role in the further amplification of the SPR response signals. This novel SPR biosensor exhibited an effective response to the rabbit IgG at the different concentrations ranging from 0.019 to 40.00 μg mL −1 . This value is 132 times lower than that observed for a traditional SPR biosensor based on Au-3-mercaptopropionic acid and 8 times lower than that obtained from an Ab 2 sandwich assay, which indicates that the SPR sensor has high sensitivity. In addition, the designed biosensor showed satisfactory recoveries to detect the rabbit IgG spiked in serum samples. Therefore, the novel SPR biosensor with high sensitivity and acceptable recovery has potential for practical applications.
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Nanoscale
·
2017
·Vol. 10
·期 4
·1631-1640
·
IF 7.367
Lingcan Kong,Xuefeng Chu,Chuanxi Wang,Hong Zhou,Yukang Wu,Wenwei Liu
The aggregation-induced emission (AIE) behavior of metal nanoclusters has attracted much attention owing to their extensive application prospects in bio-imaging and chemical sensors. However, the intrinsic mechanism of metal nanoclusters’ aggregation-induced emission is still not very clear. Herein, Cu nanoclusters S1 and Ag(I)-doped Cu/Ag nanoclusters S2 and S3 coated with D-penicillamine are designed and synthesized by a self-assembly strategy. S1–S3 show strong luminescence properties with luminescence quantum yields as high as 11.4%–14.2%. Moreover, their luminescence peak position shows an obvious hypsochromic shift from 615 (S1) to 570 nm (S3). With the introduction of Ag(I) ions, the assembly morphology also shows clear changes from the irregular assembly structure (S1) to large spherical particles with the average size of 0.18 μm for S2 and 0.47 μm for S3. A detailed investigation of high-resolution transmission electron microscopy (HRTEM) images, X-ray diffraction (XRD) patterns, ESI-TOF-mass spectra, UV-vis absorption spectra, photoluminescence spectra and luminescence lifetimes of Cu/Ag nanoclusters S2 and S3 indicates that Cu/Ag nanoclusters are actually a Cu/Ag alloy nanocluster superstructure and the microscopic arrangement of S2 and S3 is more compact and ordered relative to S1. The more compact and ordered Cu/Ag alloy nanocluster superstructure enhances the metal–metal interaction of inter-nanoclusters and intra-nanoclusters and facilitates the radiative transition of ligand-to-metal charge transfer (LMCT) and/or ligand-to-metal–metal charge transfer (LMMCT), which results in the aggregation-induced emission phenomenon. In addition, an enhanced metal–metal interaction increases the average metal–metal distance of the Cu/Ag nanocluster superstructure, leading to a hypsochromic shift of emission spectra. Furthermore, the Cu/Ag alloy nanoclusters show good stability and reversibility on pH cycling between pH = 3 and 7 and temperature cycling between 5 °C and 48 °C. The Cu/Ag alloy nanoclusters can be used as probes for Ag(I) ion and halide anion detection in real water samples by the ratiometric PL method (I570/I615).
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiang Lv,Tianhe Wang,Wei Jiang
We report a novel method to prepare translucent and stable Ag@AgCl/g-C 3 N 4 /TiO 2 ceramic films having strong photocatalytic activities and self-cleaning capabilities under light irradiation. Colloidal silica was used as an inorganic binder and P25 TiO 2 was added as a hydrophilicity enhancer without which a smooth coating was not achievable. Ag@AgCl of particle size around 30 nm, was synthesized by in-situ oxidation of nano-silver particles in porous g-C 3 N 4 /TiO 2 films. Optimal conditions for Ag@AgCl/g-C 3 N 4 /TiO 2 preparation in terms of strongest photocatalysis were established by tests on Rhodamine B degradation under visible and full spectral irradiations. A good adhesion strength of the porous films on glass substrate was achieved. Stability and reusability of the films were assessed by cycling tests. Possible photocatalytic mechanisms are proposed based on the basis of trapping experiments. Systematic characterization of the film suggests that the in-situ oxidation is an effective and practical method to produce nanoscale Ag@AgCl.
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RSC Advances
·
2018
·Vol. 8
·期 8
·3964-3973
·
IF 2.936
Li Sun,Yuechao Yin,Pengcheng Lv,Wenxian Su,Lixin Zhang
The controllable synthesis of Au–Ag alloy nanoparticles (NPs) without any hazardous or expensive chemical agent has been a challenge. This paper reports on the Chinese wolfberry fruit extract-assisted synthesis of Au–Ag alloy NPs with homogeneous composition, uniform alloy microstructure and a small average size less than 15 nm. The composition and the surface plasmon resonance (SPR) wavelength of Au–Ag alloy NPs could be linearly adjusted by the synthesis time in one-pot. Au–Ag alloy NPs were characterized by means of various techniques, and then their synthesis mechanism was discussed. The obtained Au–Ag alloy NPs were used as photocatalysts for the reduction reactions of 2-, 3-, and 4-nitrophenol and exhibited superior photocatalytic activity and stability. The rate constants of the above photocatalytic reactions could be linearly tuned by the composition of the Au–Ag alloy NPs and also by their addition amount, displaying a new method to control the rate constant. Furthermore, based on the controllable synthesis, the rate constant could even be predetermined just through setting the synthesis parameters of the Au–Ag alloy NPs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Haifeng Zhu,Renjie Ding,Jiashun Zhou,Zhiyuan Lang,Huihua Luo,Kehui Xue,Yaping Zhang,Lianqing Yu
This work proposes a novel strategy which the microwave plasma chemical vapor deposition (MPCVD) technology was used as one important preparation process for synthesizing TiO 2 @Ag@graphene ternary junction. The ternary junction exhibits an enhanced photocatalytic hydrogen production rate of 4.44 mmol·g −1 ·h −1 , which is approximately 9.25 times higher than that of pure TiO 2 (0.48 mmol·g −1 ·h −1 ). The remarkable photocatalytic activity can be attributed to the strong synergistic effect between TiO 2 @Ag and graphene. The loaded Ag and graphene can not only act as electronic conductors to effectively promote the separation of charges, but also obviously improve the response of visible light of TiO 2 . The photogenerated electrons are transferred from TiO 2 to graphene via the Ag medium was further verified by DFT calculations. Constructing an Ag-graphene interface can activate carbon atoms, which can quickly capture electron to fill the π* orbital of graphene. TiO 2 @Ag@graphene ternary junction exhibits a lower ΔG H* value of 0.51 eV than that of TiO 2 @Ag (1.49 eV), which indicates that TiO 2 @Ag@graphene ternary junction with optimal absorption energy for the hydrogen intermediate.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Xiaoxia Kang,Jige Yuan,Xijuan Gu,Xiaoyan Li,Tao Wen,Miao He,Yue He,Xiaoxiao Yang,Yuechen Li,Conglin Guo,Haiwei Ji,Yuling Qin,Li Wu
The agriculture and environmental industries have employed organophosphorus pesticides (OPs) chemicals as insecticides extensively in previous decades, leading to persistent life-threatening issues. Therefore, developing a platform for the efficient identification of OPs is significant for environmental protection and human health. In this study, a strategy for the colorimetric and fluorescence detection of OPs by combining quantum dots (QDs) with DNA-templated silver nanoclusters (DNA-AgNCs) was proposed. Technically, the fluorescence of DNA-AgNCs will be enhanced once guanine (G)-rich sequences get close to the DNA-AgNCs to form hybrid complexes DNA-AgNCs/G, while quenching of fluorescence can be attributed to the hydrolysate (thiocholine) of acetylthiocholine (ATch) that was caused by acetylcholinesterase (AchE). Based on the fact that OPs can irreversibly inhibit the catalytic activity of AchE and slow down the fluorescence quenching of DNA-AgNCs/G, thus, OPs detection can be achieved by evaluating the fluorescence intensity of DNA-AgNCs/G. Additionally, a dual-mode detection system (colorimetric and fluorescent) is achieved through an ion-exchange reaction between QDs and DNA-AgNCs/G. The concentration of OPs is quantified by monitoring fluorescence changes in the QDs and poly(9,9-dioctylfluorene) (PFO) polymer dots (Pdots) system, with PFO Pdots serving as a stable internal reference. Using trichlorfon as a model, the limit of detection (LOD) was 2.55 pg/mL, while an excellent linear relationship with the trichlorfon concentrations in the range of 5 × 100–5 × 105 pg/mL was obtained. Additionally, visual detection (as low as 1.06 pg/mL) can be realized readily, taking advantage of the ion-exchange reaction between DNA-AgNCs and QDs.
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