Nanoscale
·
2020
·Vol. 13
·期 5
·3136-3143
·
IF 6.895
Wei Wei,Tingting Bai,Ruining Fu,Litao Sun,Wen Wang,Meng Dong,Lei Chen,Zhirui Guo,Feng Xu
Controlling the growth, structure and morphology of core–shell nanoparticles (NPs) is significant for catalytic applications and it can be achieved by adding chemical additives to the synthesis reaction mixture. However, achieving precise control over NP synthesis would require a comprehensive understanding of the mechanisms of NP formation under different chemical conditions, which is quite challenging. Here, using in situ liquid cell transmission electron microscopy (TEM), the overgrowth mechanisms of Ag on Au nanobipyramids (NBPs) are studied in AgNO3 aqueous solution with ascorbic acid as the reducing agent. Au–Ag core–shell NPs are formed via two mechanistic modes: (1) atom deposition during which the Ag atoms are deposited directly onto Au NBPs without the addition of poly(vinyl)pyrrolidone (PVP) and (2) nuclei coalescence during which the Ag nanocrystals (NCs) adsorb onto Au NBPs in the presence of PVP. High-resolution imaging reveals the dynamics of the coalescence process of Ag NCs upon addition of PVP. This study helps us to understand the effect of chemical additives during the evolution of a core seed into core–shell NPs with a well-defined composition and shape. It is useful for synthesizing NPs with greater design flexibility and expanding their various technological applications.
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ACS Omega
·
2021
·
IF 3.512
Xufei Shao,Xiaotong Li,Jinzhu Ma,Runduo Zhang,Hong He
Ozone is a poisonous gas, so it is necessary to remove excessive ozone in the environment. Catalytic decomposition is an effective way to remove ozone at room temperature. In this work, 10%Ag/nano-Al2O3 and 10%Ag/AlOOH-900 catalysts were synthesized by the impregnation method. The 10%Ag/nano-Al2O3 catalyst showed 89% ozone conversion for 40 ppm O3 for 6 h under a space velocity of 840 000 h–1 and a relative humidity of 65%, which is superior to 10%Ag/AlOOH-900 (45% conversion). The characterization results showed Ag nanoparticles to be the active sites for ozone decomposition, which were more highly dispersed on nano-Al2O3 as a result of the greater density of terminal hydroxyl groups. The understanding of the dispersion and valence of silver species gained in this study will be beneficial to the design of more efficient supported silver catalysts for ozone decomposition in the future.
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Frontiers of Materials Science
·
2025
·Vol. 19
·期 3
·1-11
·
IF 2.3
Sheng Yang,Qing Danni,Zhang Peng,Sun Yixin,Zhang Rong
Tetra-aminophenyl porphyrin (TAPP)-grafted Zn–Ag–In–S quantum dots (ZAIS QDs)/poly(maleic anhydride- alt -1-octadecene) (PMAO) nanoparticles were synthesized and their photoluminescence properties as well as photodynamic properties were studied. ZAIS QDs showed the brightest photoluminescence and highest quantum yield at an optimized Zn feeding molar ratio of 20%. Those TAPP-grafted nanoparticles (i.e., ZAIS/PMAO- g -TAPP) were able to produce 1 O 2 in aqueous solution under light irradiation as indicated by the 1 O 2 indicator, 9,10-anthracenediyl-bis(methylene) dimalonic acid (ADMA). ZAIS/PMAO- g -TAPP nanoparticles also demonstrate good biocompatibility and low dark toxicity even at a concentration as high as 2.8 mg·mL −1 , whith can be applied as both a fluorescence probe and a photodynamic therapy (PDT) agent. The PDT treatment showed that the viability of melanoma A2058 cells was less than 10% after treatment with the 420 nm light irradiation for 15 min at a photosensitizer concentration of 1.7 mg·mL −1 . During the PDT treatment with Escherichia coli , the survival rate of the bacteria decreased by −95% after light irradiation at the same concentration. Such dual-functional ZAIS/PMAO- g -TAPP nanoparticles researched in this study demonstrate promising potential for fluorescence labeling as well as effective PDT treatment against cancer cells and bacteria.
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Nanocomposites
·
2019
·
IF 0
Lian Xiong,Shaodi Zheng,Zewang Xu,Zhengying Liu,Wei Yang,Mingbo Yang
In the present work, micropores and a low filler content of Ag@SiO2 nanoparticles (NPs) are synchronously introduced into polydimethylsiloxane (PDMS) film to obtain porous dielectric elastomeric composites. The morphology and dielectric and mechanical properties of the composites are investigated. The resulting composites possess high dielectric permittivity, low dielectric loss and low Young’s modulus, which is beneficial to the requirements of a dielectric elastomer actuator. This study provides an effective method to prepare high-performance PDMS-based dielectric porous dielectric elastomeric composites filled with low filler contents of Ag@SiO2 NPs.
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Desalination and Water Treatment
·
2024
·
IF 1
Guangcheng Luo,Zhigang Jia,Tao Ni,Ziyu Li,Jun Chen,Hongping Wu,Nannan Wang
In this study, the novel three-dimensional porous silver/polydopamine/polyurethane (Ag/PDA/PU) sponge was synthesized by a facile method. The PU sponge modified by polydopamine (PDA/PU) was employed not only as a carrier but also as a reducing agent. Ag ions can be in situ reduced on the fiber surface of PDA/PU sponge. The as-prepared Ag/PDA/PU sponge was characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM), and energy-dispersive X-ray (EDX). The results showed that the as-formed Ag nanoparticles had been successfully loaded onto the fiber surface of the sponge. The Ag/PAD/PU sponge exhibited higher catalytic activity for the organic pollutant in wastewater with the assistance of NaBH 4 medium. The novel Ag/PDA/PU sponge has the potential application for the treatment of wastewater containing organic pollutant due to its high catalytic efficiency, low cost, and facile synthesis process.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Chao-Ying Gao,Lin Ding,Yang Li,Ning Xu,Yakun Wu,Wenbo Wang,Jinghai Liu,Yang Yang
In the era of global warming, the conversion of carbon dioxide into high-value products has become a widely scrutinized emerging mitigation strategy. Metalation of bpy-containing MOF-253 led to the synthesis of MOF-253–0.5Ag, which acts as an efficient catalyst for the carbonylative cyclization of CO2 with alkyne molecules (such as propynyl alcohols and propynyl amines) at room temperature and ambient CO2 pressure, yielding the corresponding α-alkyl cyclic carbonates and oxazolidinones, thus endowing the catalytic system with bifunctional characteristics. Additionally, the MOF-253–0.5Ag catalyst demonstrated stability, high activity, and recyclability. The mechanisms were further elucidated through experimental results and NMR analysis, demonstrating that Ag(I) can effectively activate the C≡C bonds and hydroxy/amino groups of the substrates.
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PubMed
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-10
·
IF 2.833
Hu Min,Zhang Zhenwei,Luo Chenkun,Qiao Xiuqing
In this paper, hierarchical Ag-decorated SnO 2 microspheres were synthesized by a facile one-pot hydrothermal method. The resulting composites were characterized by XRD, SEM, TEM, XPS, BET, and FTIR analysis. The catalytic performances of the samples were evaluated with the reduction of 4-nitrophenol to 4-aminophenol by potassium borohydride (KBH 4 ) as a model reaction. Time-dependent experiments indicated that the hierarchical microspheres assembled from SnO 2 and Ag nanoparticles can be formed when the react time is less than 10 h. With the increase of hydrothermal time, SnO 2 nanoparticles will self-assemble into SnO 2 nanosheets and Ag nanoparticles decorated SnO 2 nanosheets were obtained. When evaluated as catalyst, the obtained Ag-decorated SnO 2 microsphere prepared for 36 h exhibited excellent catalytic performance with normalized rate constant ( κ
nor ) of 6.20 min −1 g −1 L, which is much better than that of some previous reported catalysts. Moreover, this Ag-decorated SnO 2 microsphere demonstrates good reusability after the first five cycles. In addition, we speculate the formation mechanism of the hierarchical Ag-decorated SnO 2 microsphere and discussed the possible origin of the excellent catalytic activity.
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高影响因子
Coatings
·
2025
·Vol. 15
·期 3
·267
·
IF 2.8
Junyu Liu,Hansheng Li,Wencan Cui,Shihua Sang,Liang Guan,Chen Zhao
This study focuses on the preparation of a highly active surface-enhanced Raman spectroscopy (SERS) substrate, where Ag nanoparticles synthesized by the Lee–Meisel method are loaded onto the surface of GO@PVP nanoparticles through classical electrostatic attraction. The substrate was characterized by SEM and XPS analysis. The SERS-active substrate was utilized for the detection of phenanthrene in aqueous solutions, achieving a detection limit of 10−8g/L (5.6 × 10−11mol/L). In comparison to conventional Raman spectroscopy, this method exhibits a significant reduction in the detection limit and holds promise for trace polycyclic aromatic hydrocarbons (PAHs) monitoring in environmental samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ying Qi,Huaming Yang,Chunli Li,Hao Li
During the storage/transportation of fruits and vegetables, ethylene-induced over-maturation and spoilage is a serious problem. Currently developed ethylene adsorbents exhibit great potentials due to their low cost and high efficiency, but always lack of water resistance. Herein, we developed Ag/F-Z5(X) adsorbents via the modification of ZSM-5 with different amounts of NH 4 F followed by silver loading, which exhibits enhanced ethylene adsorption and water resistance. Among the samples, Ag/F-Z5(25) featured with the largest capacity (6.44 mg·g −1 ) and the best water resistance, achieving near-complete removal of trace ethylene (100 ppm) at room temperature. Based on the characterizations, NH 4 F modification induced a hierarchical structure within the ZSM-5 framework, concurrently enhancing surface acidity, increasing the proportion of Ag + , and improving the dispersion of metals in the adsorbents. These enhancements collectively contribute to enhanced adsorption and water resistance. Further, banana storage experiments confirmed the actual preservation ability of Ag/F-Z5(25) thanks to the better adsorption and water resistance than unmodified Ag/Z5. These findings offer meaningful insights for developing high-efficient and water-resistant adsorbents to remove trace ethylene, consequently mitigating food aste and enlarging the commercial value of agricultural products.
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Materials Today Chemistry
·
2025
·
IF 6.7
Xiaoman Qi,Yonghui Xia,Jingtao Wu,Xuan Wan,Tianyu Wang,Qing Li,Guangli Li
The abuse of marbofloxacin (MBF) leaves residues in foods and environment. Therefore, developing a selective method for trace determination of MBF is of great significance. Herein, a bimetallic Au@Ag nanoparticle-decorated black phosphorus nanosheet-supported molecularly imprinted polymer film (MIP/BPNS-Au@AgNP) was fabricated for label-free and robust MBF sensing. In the presence of MBF, a polypyrrole film was grown onto the surface of BPNS-Au@AgNPs via potentiodynamic scanning. Au@AgNP functionalization prevented BPNS from degrading in aqueous solutions, enhanced its electrical conductivity, and provided a larger surface area to accommodate more selective imprinted cavities. Hence, the MIP/BPNS-Au@AgNP film demonstrated excellent electrochemical activity for MBF oxidation, including a broad linear dynamic concentration range (0.001–10 μM) and a low limit of detection (0.13 nM). Moreover, the MIP/BPNS-Au@AgNP film exhibited outstanding signal discrimination ability against potential interfering species and retained robust responses for four weeks. The MIP/BPNS-Au@AgNP film could also determine trace amounts of MBF in milk, sewage, and serum.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Hua Zhang,Linlin Xu,Yue Tian,Anxin Jiao,Ming Chen
Optical anticounterfeiting labels based on surface-enhanced Raman scattering (SERS) with enriched molecular “fingerprint” information is not only related to the enhanced sensitive detection but also strongly dependent on excellent long-time stability of nano-platforms. By virtue of in-situ overgrowth of highly dense and close-packed Ag nanoparticles (NPs) on Ti 3 C 2 T x nanosheets, herein, we prepared an extraordinary SERS active nano-substrates with exceptional long-term stability for achieving ultrastable anticounterfeiting tags. The obtained Ag@Ti 3 C 2 T x exhibit a significantly SERS activity with a detection limit of methylene blue (MB) molecules as low at 10 -16 M, approaching 0.1 femtomole (fM) ultra-trace level. More importantly, since nearly all active Ag NPs were completely encapsulated in the 2D supports, the unparalleled stability of the resultant Ag@Ti 3 C 2 T x can be undoubtedly verified by immersing them into H 2 O 2 oxidative solution, which is obviously better than that of bare Ag NPs. Then, the hybrid Ag@Ti 3 C 2 T x were subsequently incorporated into polydimethylsiloxane (PDMS) to obtain transparent flexible Ag@Ti 3 C 2 T x @PDMS, giving rise to the ultra-sensitive SERS imaging-based steganographic information. Interestingly, the ultrastable anticounterfeiting capability of the smart SERS nano-platforms is further highlighted by keeping them even after for 400 days storage. The present work holds a great potential for propelling robust SERS-based steganography in many practical real-world scenarios.
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PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Yuxin Song,Huan Xing,Liang Ma,Fengxia Wang,Mingfang Zhang,Zherui Wan,Xuewen Li,Yan Tang,Guang Yang
Heavy metal ions (HMIs) pose a great threat to human health because of their irreversible detrimental effects, thus the fabrication of a convenient sensing platform that is capable of tracing HMIs with high accuracy remains a major challenge. Herein, a portable strategy for the fabrication of electrochemical sensor was described in which Ag-ZIF-8 and polyaniline (PANI) were combined and dropwise to glassy carbon electrode (GCE) for the recognition of Pb 2+ and Cu 2+ by DPSV. The structures and properties of the proposed working electrode (PANI/Ag-ZIF-8/GCE) were studied by TEM, SEM, FT-IR, XRD, CV and DPSV. Additionally, the results revealed that the designed sensing platform of the PANI/Ag-ZIF-8/GCE displayed excellent electrochemical performance for the simultaneous and individual tracing of HMIs including (Pb 2+ and Cu 2+ ) with satisfactory sensitivity and selectivity due to the excellent conductivity of PANI and large surface areas with abundant active sites on Ag-ZIF-8. The LODs for individual recognition of Pb 2+ and Cu 2+ were 0.003 μM and 0.006 μM, respectively. The LODs of simultaneous tracing of Pb 2+ and Cu 2+ were 0.004 μM and 0.008 μM, respectively. Moreover, real sample analysis of tap water and the Songhua River indicated good results with higher reliability for the detection of target HMIs, which may be beneficial for the fabrication of MOF-based probes by a simple strategy for the detection of HMIs to safeguard people’s lives and health.
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