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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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Gang Cheng,Xinyu Tong,Wuxia Zhang,Wei Chen,Jinyan Xiong
Using amine-modified protonated titanate (NH2–H2Ti2O5·3H2O) as a template, surface reconstruction is carried out by hydrothermal treatment in the NaOH/ethylene glycol (EG)/H2O system, and finally, Ag nanoparticle-loaded 1D@2D TiO2@Na2Ti3O7 nanoarchitectures (TiO2@Na2Ti3O7–Ag) have been fabricated. The corresponding formation process is analyzed by using XRD, SEM, and EDX techniques. XPS and Fourier transform infrared (FT-IR) spectra confirm the presence of surface amino groups. Photo/electrochemical measurements indicate that the loading of Ag0 is beneficial for light absorption, charge separation, and transfer of 1D@2D TiO2@Na2Ti3O7 nanoarchitectures. The best CH4 and CO yields in the photocatalytic CO2 reduction test on the TiO2@Na2Ti3O7–Ag0.025 photocatalyst are 9.01 and 0.88 μmol/g/h, which are improved nearly 64 and 44 times, respectively. The generation of the *HCOO–, *CO, and *OCH3 intermediates corresponding to the reaction pathway is studied by in situ FT-IR. These findings could pave ways for the development of efficient photocatalytic CO2 conversion systems.
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Catalysts
·
2025
·Vol. 15
·期 7
·638
·
IF 4
Elmuez Dawi,Mohsen Padervand
Ag/AgCl-decorated layered lanthanum oxide (La2O3) and niobium pentoxide (Nb2O5) plasmonic photocatalysts are fabricated through an ionic liquid-mediated co-precipitation method. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) techniques were used to illustrate the physicochemical properties of the materials. The photoactivity was evaluated for the degradation of Acid Blue 92 (AB92) azo dye, a typical organic contaminant from the textile industry, and U251 cancer cell inactivation. According to the results, Nb2O5–Ag/AgCl was able to remove >99% of AB92 solution in 35 min with the rate constant of 0.12 min−1, 2.4 times higher than that of La2O3–Ag/AgCl. A pH of 3 and a catalyst dosage of 0.02 g were determined as the optimized factors to reach the highest degradation efficiency under solar energy at noon, which was opted to have the highest sunlight intensity over the reactor. Also, 0.02 mg/mL of Nb2O5–Ag/AgCl was determined to be of great potential to reduce cancer cell viability by more than 50%, revealed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and mitochondrial membrane potential (MMP) examinations. The mechanism of degradation was also discussed, considering the key role of Ag0nanoparticles in inducing a plasmonic effect and improving the charge separation. This work provides helpful insights to opt for an efficient rare metal oxide with good biocompatibility as support for the plasmonic photocatalysts with the goal of environmental purification under sunlight.
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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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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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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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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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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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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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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Jun-Tao Cao,Xiao-Long Fu,Li-Zhen Zhao,Shu-Hui Ma,Yan-Ming Liu
Nowadays, electrochemiluminescent resonance energy transfer (ECL-RET) as a promising signaling mechanism has been proved its promising perspective for bioassay, whereas the limitation of energy transfer efficiency remains a big challenge. Herein, we highlight a high-efficient ECL-RET mode between luminescent materials and noble metal nanoparticles, in which luminescent materials (g-C 3 N 4 nanosheets as the energy donor) and noble metal nanoparticles (Ag nanoparticles as the energy acceptor) were innovatively combined into one nanostructure, greatly reducing the energy loss and effectively promoting the RET efficiency. To prove the concept of the RET mode in ECL bioanalysis, a split-type ECL immunosensor was developed using interleukin-6 (IL-6) as a model. In the presence of IL-6, a sandwich immunoreaction occurred in anti-IL-6 antibody-coated 96-well plate by using glucose oxidase and anti-IL-6 antibody-conjugating silicon dioxide nanoparticles (anti-IL-6-SiO 2 -GOx) as signal label. The carried GOx oxidized glucose to generate H 2 O 2 , which etched Ag nanoparticles in g-C 3 N 4 -Ag nanostructure, thereby destroying the ECL-RET between g-C 3 N 4 and Ag and thus recovering the ECL intensity. The high-efficient ECL-RET in one nanostructure and GOx-induced H 2 O 2 etching modulation in this proposed system endowed the high sensitivity of the immunoassay toward IL-6 with the detection limit of 3.2 × 10 −14 g/mL and the dynamic working range of 1.0 × 10 −13 –1.0 × 10 −8 g/mL. It’s believed that this ingenious combination of g-C 3 N 4 and Ag into one nanostructure provides a new perspective to expand the application of ECL-RET of luminescent materials and noble metal nanoparticles.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Dong Liang,Junjun Luo,Yaliang Huang,Xiang Liang,Zaichun Zhou,Jianxiu Wang,Xiaoqing Qiu
In this study, we report the development of indirect Z-scheme heterojunction to construct a cathodic photoelectrochemical (PEC) sensor for highly-selective detection of endogenous H 2 S using AgCl-Ag core–shell nanostructures coupled with porous carbon nitride (PCN) as cathode materials. As an electron mediator, Ag on the Z-scheme heterojunction transformed to Ag 2 S in the presence of H 2 S, resulting in the destruction of original charge-carrier migration pathway. Meanwhile, photo-induced charges on the then formed AgCl-Ag 2 S/PCN cannot be as effectively separated as they are on AgCl-Ag/PCN due to the straddling energy band alignments. A decrease in cathodic signal may be expected. Consequently, the H 2 S concentration could be quantitated by such corresponding decrease, which thus underlines a novel signal-off cathodic PEC bioanalysis strategy. More importantly, the ‘Z-scheme’ PEC sensor based on AgCl-Ag/PCN exhibits analytical performance with high sensitivity, showing its potential to be applied to the areas of biomedical and health care etc.
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Nature Communications
·
2025
·
IF 15.7
Pi Dengwen,Yang Xiaobo,Chen Meixin,Zhao Jian,Wang Jiuyi,Wang Shifu,Shih Wen-Cheng,Xu Wei,Huang Yanqiang,Liu Bin,Li Xuning
The electrochemical oxidation of propylene presents a promising strategy for propylene oxide (PO) synthesis, but is severely hindered by the complex reaction pathways and the low PO selectivity. In this work, a series of Ag-decorated FeOOH catalysts is designed to elucidate the reaction mechanism of the electrochemical propylene oxidation reaction for PO electrosynthesis. An optimal Faradaic efficiency of PO of 32.0% is achieved over the single-Ag-atom decorated FeOOH catalyst (Ag 1 -FeOOH) at 2.4 V versus reversible hydrogen electrode. The in-situ attenuated total reflectance surface-enhanced infrared absorption spectroscopy and in-situ 57 Fe Mössbauer spectroscopy measurements combined with density functional theory calculations reveal the dual-site synergistic catalytic mechanism for electrochemical propylene epoxidation over Ag 1 -FeOOH, where single-Ag-atom sites catalyze water oxidation to generate reactive oxygen species, while the adjacent Fe sites serve as adsorption sites for propylene activation. This study provides clear insights into the dual-site synergistic electrocatalytic mechanism of propylene epoxidation and sheds light on the rational design of single-atom catalysts for electrochemical organic synthesis.
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