OPTICS EXPRESS
·
2025
·Vol. 33
·期 15
·32737-32748
·
IF 3.3
Shi Wang,Wenbo Wu,Yue Li,Chenxi Gu,Xiaolong Song,Yafang Pan,Zhen Sun,Zhen Sun,Yunfan Yang,Yunfan Yang,Tifeng Jiao,Tifeng Jiao,Mingli Wang
Surface enhanced fluorescence (SEF) plays a key role in sensing and cell imaging. However, in order to prevent cytotoxicity, the concentration of noble metal nanoparticles (Ag) needs to be lowered, which leads to poor SEF performance. Herein, different Ag@C (core-Ag, shell-carbon) nanoparticles were synthesized, and Ag@C nanoparticles prepared under 4 h heating (AC4.0) had the largest SEF enhancement factor (EFsef). Dilution of AC4.0 markedly reduces EFsef. Subsequently, Ag@C-GSH nanoparticles (ACG) were prepared by modifying glutathione (GSH) on the surface of diluted AC4.0. EFsef of ACG was improved at pH 4, and similar result for diluted AC4.0 at pH 8. This recovery of EFsef at low nanoparticle concentrations was attributed to a mechanism of electric field strength enhancement: acid-induced protonation of glutathione mediates aggregation of ACG via hydrogen bonding, which amplifies electric field strength at “hot spots”.
研究领域:
纳米技术
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光学传感
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生物成像
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材料科学
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分析化学
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PubMed
高影响因子
CARBON
·
2018
·
IF 7.082
Xin Liu,Changfeng Chen,Hongwu Ye,Yushuai Jia,Yiyun Wu,Ailing Jin,Yabin Wang,Xiangshu Chen
The growth of Ag nanowire@carbon nanofiber@Ag nanoparticles (denoted as Ag NW@CNF@Ag NPs) is achieved by a one-step, template-free hydrothermal method using Ag 3 PO 4 -AgCl as the catalyst precursor and naturally available glucose as the carbon source. In the hydrothermal process, freshly prepared AgCl together with the active Ag 0 particles produced by the Ag 3 PO 4 –glucose redox reaction cocatalyzes the growth of tubular CNFs and leads to in situ assembly of the coaxial one-dimensional nanostructure of Ag NW@CNF, with ultrasmall Ag NPs well dispersed outside. The structure and composition are characterized using various advanced microscopic and spectroscopic techniques. The fabricated Ag NW@CNF@Ag NPs composite displays superb catalytic activities for the photodegradation of the organic pollutant methylene blue under visible light, which is contributed by the excellent adsorption ability of CNFs as well as the unique electron transport property afforded by the synergistic effect between Ag NW-Ag NP and conductive CNF. Coupled with economical, environmentally friendly synthetic process, sustainability of precursor, and versatility of material, the novel ternary composite developed in this study paves a new way for the fabrication of other carbon material-based hybrids to improve heterogeneous catalysis and solar-driven photocatalytic applications.
研究领域:
材料科学
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环境科学
·
纳米技术
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DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 15
·9123-9134
·
IF 4.21
Zhou Jianhua,Wang Lin,Zha Xianghua,Li Xiang
Abstract Ag/fluorine-containing polyacrylate latex was successfully synthesized via Pickering emulsion polymerization using Ag/poly(2-dimethylaminoethyl methacrylate- co -hexafluorobutyl acrylate) (Ag/P(DMAEMA- co -HFBA)) hybrid micelles as particle emulsifiers. The influences of introducing the Ag nanoparticles (NPs) component and the concentration of Ag/P(DMAEMA- co -HFBA) hybrid micelles on emulsion polymerization and finished cotton fabric properties were studied. The results showed that the Ag/fluorine-containing polyacrylate latex had a higher conversion, smaller particle size than the fluorine-containing polyacrylate latex using P(DMAEMA- co -HFBA) micelles as emulsifiers, indicating the positive effect of Ag NPs on emulsion polymerization. And thermogravimetric analysis (TGA) proved that Ag NPs improved the thermal stability of the latex film. Moreover, the surface of the cotton fabric finished by Ag/fluorine-containing polyacrylate latex showed more rough morphology, better hydrophobicity and excellent antibacterial activity owing to the synergistic effect of the cationic fluorine-containing polyacrylate compounds and Ag nanoparticles. Meanwhile, the presence of Ag NPs also improved the tensile strength of the finished cotton fabric, but reduced slightly the whiteness. When the concentration of Ag/P(DMAEMA- co -HFBA) hybrid micelle emulsifier was 8 mg/mL, the Ag/fluorine-containing polyacrylate latex particles presented regular raspberry-shaped with an average diameter of 120 nm, and the water/oil contact angles of finished cotton fabric attained 145° and 90°, respectively. In addition, the finished cotton fabric exhibited excellent antibacterial properties against both S. aureus and E. coli as the concentration of Ag/P(DMAEMA- co -HFBA) hybrid micelles was 12 mg/mL. The mechanism for the formation of Ag/fluorine-containing polyacrylate latex was proposed. Graphic abstract
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Xiuling Xue,Xiuwen Gong,Xiaoyi Chen,Bor-Yann Chen
In recent years, environmental pollution caused by volatile organic compounds (VOCs) has posed a great challenge to environmental protection. This first-attempt study provided a novel facile chemical precipitation-reduction method to construct Ag/Ag 2 O@TiO 2 (A/AO@TO) photocatalyst for the removal of gaseous toluene. The introduction of Ag in the presence of NaBH 4 with N 2 purging inhibited the passivation of Ag 2 O and thus enhanced the stability of A/AO@TO. A/AO@TO exhibited outstanding photocatalytic performance toward gaseous toluene under different light sources like UV light , simulated sunlight and natural light, which were 99.3%, 48.3% and 28.5%, respectively. The superior photocatalytic performance could be attributed to the synergy effect of p-n heterojunction between Ag 2 O and TiO 2 and the surface plasmon resonance (SPR) effect of Ag, which facilitate the separation of charge carriers and thus suppress the recombination rate of them, and enhance the light response. The active species like ·OH, ·O 2 − and h + were contributed to the excellent photocatalytic performance. The study provided a new method for the fabrication of A/AO@TO photocatalyst and introduce p-n scheme A/AO@TO as a feasible natural sunlight photocatalyst for further applications.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Zhiyu Liu,Liang Chen,Congcong Piao,Jianhe Tang,Yu Liu,Yitong Lin,Dawei Fang,Jun Wang
A novel Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is prepared via hydrothermal and calcination methods. In this system, WO 3 :Yb 3+ ,Er 3+ is used as an excellent up-conversion luminescent agent and highly active photocatalyst to broaden the light response range. Ag with SPR effect is regarded as electronic channel and cocatalyst to accelerate electron transfer and increase hydrogen production. The photocatalytic performance of Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is assessed by levofloxacin degradation with synchronous hydrogen production. Some influence factors, sunlight irradiation time, sacrificial agent concentration and catalyst cycle number, are discussed. The emission light spectrum and energy conversion mechanism of WO 3 :Yb 3+ ,Er 3+ are studied. The photocatalyst gives prominent degradation ratio (90.44 %) and hydrogen production amount (489.02 μmol/g) under sunlight irradiation for 180 min. It shows a high stability and reusability in levofloxacin degradation with synchronous hydrogen production within five cycles. The possible mechanism of levofloxacin degradation with synchronous hydrogen production caused by Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is proposed.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Jun Zan,Yang Shuai,Jun Zhang,Jiachi Zhao,Bingxin Sun,Liuyimei Yang
Intrauterine adhesion (IUA) is a common gynecological disease caused by endometrial injury, which might result in abnormal menstruation, miscarriage, and even fetal deaths. Nevertheless, existing treatment strategies such as intrauterine device and uterine cavity balloons only provide a physical barrier, and not circumvent inflammation of endometrial microenvironment and retrograde infection. In this study, a slow-controlled bifunctional nanostructure was developed via encapsulating hyaluronic acid (HA) on surface of silver-metal organic framework (Ag-MOF), and then loaded in poly lactic- co -glycolic acid scaffold to prevent IUA. In therapy, macro-molecule of HA provided anti-inflammatory function by the adjustment of signal transduction pathways of macrophage surface receptors, whereas Ag-MOF inactivated bacteria by destroying bacterial membrane and producing reactive oxygen. Significantly, the coated HA effectively avoided burst release of Ag + , thus achieving long-term antibacterial property and good biocompatibility. Antibacterial results showed antibacterial rate of the scaffold reached 87.8 % against staphylococcus aureus . Anti-inflammatory assays showed that the scaffold inhibited the release of inflammatory cytokines and promoted the release of anti-inflammatory cytokines. Moreover, in vitro cell tests revealed that the scaffold effectively inhibited fibroblast growth, indicating its good ability to prevent IUA. Taken together, the scaffold may be a promising candidate for IUA treatment.
研究领域:
妇科学
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纳米医学
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生物材料
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药剂学
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DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 68
·e202202044
·
IF 5.02
Hanghang Zhou,Ying Luo,Jun Xu,Lidan Deng,Zheng Wang,Hong He
Graphical The well-defined CaTaO 2 N single crystals with uniform particle size were successfully synthesized through a one-pot NaCl-assisted nitridation procedure. The performance of photocatalytic CO 2 reduction to CO by H 2 O under visible light was enhanced due to the high crystallinity of CaTaO 2 N and the modification with core-shell structured Ni−Ag bicomponent cocatalyst. Cubic-like CaTaO 2 N photocatalysts with high crystallinity and uniform particle size were successfully prepared by the flux-assisted nitridation method. The growth of CaTaO 2 N single crystals under different synthesis conditions was systematically investigated to understand the effects of the crystallinity and optical property on photocatalytic performance of CO 2 reduction. Moreover, the modification of CaTaO 2 N single crystals with core-shell Ni−Ag bicomponent cocatalyst by two-step decoration process gave a 2.4 times higher amount of CO evolution than the deposition of sole Ag cocatalyst, because of the synergistic effects of bicomponent cocatalyst on the interfacial electron transfer and surface catalytic process. This study provides a valuable way to construct high-crystalline photocatalysts with effective bicomponent cocatalyst for visible-light-driven CO 2 reduction with H 2 O.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Min Wang,Dehua Xin,Wei Zhang,Dan Luo,Guoqiang Tan
The optimization of the photogenerated carriers’ relaxation dynamics process is critical for the improvement of photocatalytic performance. Herein, a ternary heterojunction with multilevel charge transfer channels was constructed by coupling plasma Ag, nitrogen vacancies carbon nitride (NVs-CN) and Bi 2 O 2-δ CO 3 . Ag/NVs-CN/Bi 2 O 2-δ CO 3 heterojunction showed the S-scheme mechanism, which not only promoted the interfacial charge transfer, but also enhanced the driving force for redox reactions. The defect states induced by nitrogen vacancies and oxygen vacancies provided an additional energy level platforms for hot electrons relaxation of plasma Ag, resulting in the improved separation efficiency and utilization rate of the high-energy hot carriers. Hence, the prepared Ag/NVs-CN/Bi 2-δ O 2 CO 3 heterojunction exhibited the markedly boosted full-spectrum driven catalytic activity for antibiotics degradation. 80.5% and 83.8% of tetracycline and ciprofloxacin could be mineralized into H 2 O and CO 2 by the optimal heterojunction under visible light irradiation, and the corresponding mineralization efficiencies could reach 81.7% and 81.5% under NIR light irradiation. The proposed multichannel charge transfer mechanism provided a new insight into the design and preparation of high-active full-spectrum responsive heterojunction photocatalysts.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yingdong Hao,Yonghui Zhao,Chunlai Zhang,Xinqing Chen,Nannan Sun,Wei Wei
Achieving a high yield of oxygenates and inhibiting overoxidation remain challenging for CH 4 photooxidation. Here, we report a catalyst with enriched Ag-ZnO interfaces by using ZIF-8 as the precursor. The resulting Ag/Z-450 photocatalysts show extraordinary efficiency in the photocatalytic oxidation of CH 4 , a high liquid oxygenate yield of 57.88 mmol·g cat −1 (28.94 mmol·g cat −1 ·h −1 ) and a selectivity of ∼100 % were obtained over 3.0Ag/Z-450, with HCHO as the major product (41.04 mmol·g cat −1 , ∼71 % selectivity). Mechanistic studies revealed that ZnO and Ag species acted as electron donors and acceptors, respectively, which enhanced charge carriers transfer and separation. CH 4 and O 2 can be effectively activated to generate •CH 3 and reactive oxygen species (ROS), their following reaction led to formation of CH 3 OOH, which can be further converted to CH 3 OH and HCHO. This work contributes to the development of a “two-in-one” CH 4 photooxidation catalyst system that simultaneously achieves unparallel productivity and selectivity.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Lei Wang,Cunzhi Zhang,Hui He,Hongxiang Zhu,Wei Guo,Shile Zhou,Shuangfei Wang,Joe R. Zhao,Jian Zhang
A novel cellulose-based colorimetric sensor (DAC-Tu) with N, S sites for Ag + was prepared. The DAC-Tu exhibited excellent selectivity and sensitivity for Ag + with a naked eyes color change from white to black in mixed metal ions aqueous solutions. The naked-eye in-situ detection limit of DAC-Tu for Ag + was 10 −6 mol/L within 10 min. The cellulose matrix and the grafted functional groups ( C S, NH 2 ) of DAC-Tu all contributed to the low naked-eye in-situ detection limit. The mechanism of the visual recognition of DAC-Tu sensor for Ag + was proposed, the N and S atoms of DAC-Tu preferentially coordination chelated with Ag + to form N Ag, S Ag, and Ag 2 S, and enriched on the cellulose matrix, thus the DAC-Tu presented different color change in response to different concentrations of Ag + . The as-prepared DAC-Tu colorimetric sensor showed a great application prospect for in-situ naked eyes detection of Ag + .
研究领域:
分析化学
·
材料科学
·
环境科学
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高影响因子
Polymers
·
2019
·Vol. 11
·期 4
·627
·
IF 3.164
Chuanmei Liu,Jie Liu,Xin Ning,Shaojuan Chen,Zhengqin Liu,Shouxiang Jiang,Dagang Miao
A practical method for preparing multifunctional polypropylene (PP) nonwoven fabrics with excellent stability and durability was explored. First, the PP nonwoven fabric was sputtered by a magnetron sputtering system to form an Ag film on the surface of the fabric. Subsequently, the coated fabric was treated with dopamine. The fabrics were characterized by scanning electron microscopy (SEM), an energy dispersive spectrometer (EDS), electrical conductivity, electromagnetic interference shielding effectiveness (EMI SE), antibacterial activity, stability, and laundering durability. The results of the study revealed that the fabric was coated with Ag, and after the treatment with dopamine, the surfaces of Ag-coated fibers were coated with polydopamine (PDA). The fabrics still had a sheet resistance below ~15 Ω/sq and exhibited excellent EMI SE above ~25 dB, though few differences existed from the single Ag-coated sample. After the treatment with dopamine, the antibacterial activity of the fabric was enhanced. Meanwhile, the treated samples exhibited excellent resistance against sodium sulfide corrosion, which could enhance the stability of the Ag-coated fabric. Moreover, the laundering durability of the treated fabric was improved in the same process, whose lowest sheet resistance was ~18 Ω/sq and the EMI SE was ~8 dB more than single Ag-coated PP nonwoven fabrics. In conclusion, this method was considered to be effective in fabricating multifunctional, stable, and durable fabrics.
研究领域:
材料科学
·
纺织工程
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DOI
高影响因子
Journal of Materials Chemistry C
·
2013
·Vol. 1
·期 25
·4008-4013
·
IF 0
Fei Qu,Li Li Dou,Nian Bing Li,Hong Qun Luo
The solvatochromism of metal nanoclusters is still a highly debatable topic. In this work, based on hyperbranched polyethyleneimine (PEI)-encapsulated Ag nanoclusters, we present some interesting results on the chemical environment-responsive fluorescence of Ag nanoclusters in 11 different solvents, which may shed some light on this issue. In water and alcohols, the nanoclusters emit intense blue fluorescence; when they are dispersed in water–tetrahydrofuran (THF) mixtures, the fluorescent color changes from intense blue (in pure water) to intense yellow (in pure THF); when they are dispersed in ethylene glycol monomethyl ether, the fluorescence changes from blue to green over time. However, while the fluorescence emission changes, no obvious band shift is exhibited in the absorption features of Ag nanoclusters. Therefore, the PEI-capped Ag nanoclusters show obvious solvatofluorochromic but not solvatochromic properties. Furthermore, the emission from these clusters can also be tuned from blue to yellow by changing the concentration of the Ag nanoclusters.
研究领域:
材料科学
·
化学
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DOI
危险品化学品经营许可证（带存储）