Sensors & Diagnostics
·
2023
·
IF 0
Zeyi Wang,Yuping Li,Jian Zhang,Xiao Huang
As a piezoelectric ceramic material, SeZnO3 has received increasing attention for pressure sensing. However, the poor conductivity and low dielectric constant of bare SeZnO3 severely limit its wide applications. Herein, to improve the pressure sensing properties of SeZnO3, SeZnO3 nanosheets composited with Ag nanoplates were synthesized via a dissolution coprecipitation method, which exhibited a higher sensitivity (54.8 kPa−1) to external pressure with an excellent repeatability than that of bare SeZnO3 nanosheets (12.3 kPa−1). The enhanced pressure sensing properties of Ag/SeZnO3 nanocomposites could be attributed to an increased dielectric constant and an enhanced charge output. Moreover, the nanocomposite-based pressure sensors showed an accelerated response/recovery rate (0.7 s/2.7 s) because of the effective charge transfer between SnZnO3 and Ag, which was confirmed by XPS results. This Ag/SeZnO3 composite nanosheet-based pressure sensor demonstrates a potential for practical monitoring of human movement.
研究领域:
材料科学
·
电子工程
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jinrong He,Wei Qu,Yun Feng,Jinrui Jiang,Jiaming Luo,Yuzhang Wu,Limin Peng
Melamine-impregnated paper, a decorative material in furniture and interior design, could potentially impede the spread of indoor bacteria if it possesses antibacterial properties. Here, nano Ag-doped ZIF-8 (Ag@ZIF-8) was synthesized using ion exchange and in-situ chemical reduction strategies, followed by incorporating it into melamine-impregnated paper. The ion exchange mechanism of Zn 2+ and Ag + during ion exchange reactions was investigated. The structure of Ag@ZIF-8 was well-defined, with Ag nanoparticles evenly distributed on the surface of ZIF-8. Ag@ZIF-8 showed good thermal stability at 400 °C, meeting the requirements for the hot-pressing process of the melamine-impregnated paper. Ag@ZIF-8 exhibited enhanced ROS generation under visible light compare to ZIF-8, which was attributed to its reinforced light absorption and charge carrier separation facilitated by the localized surface plasmon resonance (LSPR) effect. The antibacterial activity of Ag@ZIF-8 was better than ZIF-8, owing to the multiple-synergistic antibacterial mechanisms of the ion release and ROS generation. Specifically, the 10-Ag@ZIF-8 exhibited MIC of 128 μg/mL and 64 μg/mL against E. coli and S. aureus , respectively. The signal intensity of •O 2 − induced by 10-Ag@ZIF-8 was 4.38 times higher than that of ZIF-8. As the addition of Ag@ZIF-8 increased, the antibacterial performance of melamine-impregnated paper improved. Considering the antibacterial property and economy of melamine-impregnated paper, 0.20 wt% was the optimal amount for 10-Ag@ZIF-8 decorated blockboard. This study proposes a novel approach for synthesizing MOF-based melamine-impregnated paper with antibacterial properties, aiming to reduce bacterial spread, minimize disease risks, and contribute to lowering overall healthcare costs.
研究领域:
材料科学
·
微生物学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Yanqing Cong,Jiaxin Yi,Shengna Liang,Feng Zhang,Yi Zhang,Shi-Wen Lv
Bimetallic oxides with spinel structure show great prospects in the photocatalysis owing to many active sites. Herein, a novel 500NiCo 2 O 4 @CdS–5%Ag composite was fabricated via a feasible strategy. Interestingly, the combination with NiCo 2 O 4 could significantly enhance the absorption ability of CdS for visible light. Benefiting from the formation of heterojunction structure between NiCo 2 O 4 and CdS, the recombination of photogenerated electrons and holes was remarkably restrained. As an effective mediator, deposition of Ag could further promote the transfer of photogenerated charge carriers, thereby accelerating the reaction rate. Meanwhile, light absorption capacity of composite was also improved, owing to the surface plasmon resonance effect of metallic Ag. More importantly, 500NiCo 2 O 4 @CdS–5%Ag composite with great stability displayed an excellent performance in the photocatalytic degradation of OFX, and its highest removal efficiency was as high as 99.14%. Possible degradation pathways of OFX were given, and most of OFX could be degraded into CO 2 , H 2 O and other by-products with no toxicity. Significantly, the separation and transfer of photogenerated charge carriers followed indirect Z-scheme heterojunction mechanism. The O 2 − , OH and 1 O 2 were main active species in photocatalytic reaction system. All in all, current work inspired some new ideas for designing novel photocatalytic system in wastewater treatment .
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 4
·892-901
·
IF 4.204
Wang Yixing,Dai Liheng,Qu Kai,Qin Lu,Zhuang Linzhou,Yang Hu,Xu Zhi
Photocatalytic membranes have received increasing attention due to their excellent separation and photodegradation of organic contaminants in wastewater. Herein, we bound Ag-AgBr nanoparticles onto a synthesized polyacrylonitrile-ethanolamine (PAN-ETA) membrane with the aid of a chitosan (CS)-TiO 2 layer via vacuum filtration and in-situ partial reduction. The introduction of the CS-TiO 2 layer improved surface hydrophilicity and provided attachment sites for the Ag-AgBr nanoparticles. The PAN-ETA/CS-TiO 2 /Ag-AgBr photocatalytic membranes showed a relatively high water permeation flux (~ 47 L·m −2 ·h −1 ·bar −1 ) and dyes rejection (methyl orange: 88.22%; congo red: 95%; methyl blue: 97.41%; rose bengal: 99.98%). Additionally, the composite membranes exhibited potential long-term stability for dye/salt separation (dye rejection: ~97%; salt rejection: ~6.5%). Moreover, the methylene blue and rhodamine B solutions (20 mL, 10 mg · L −1 ) were degraded approximately 90.75% and 96.81% in batch mode via the synthesized photocatalytic membranes under visible light irradiation for 30 min. This study provides a feasible method for the combination of polymeric membranes and inorganic catalytic materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Industrial Textiles
·
2022
·
IF 2.926
Jing Han,Hai-Tao Ren,Ting-Ting Li,Bing-Chiuan Shiu,Yong-Gui Li,Jia-Horng Lin,Ching-Wen Lou
Visible light response PAN@Ag-Ag2O/Sch (PAN@AS, schwertmannite and polyacrylonitrile abbreviated as Sch and PAN) nanofibers with different mass ratios were synthesized by electrospinning technology and pH-induced precipitation reaction. X-Ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy analysis showed that the formation of Ag-Ag2O/Sch heterojunction and Ag-Ag2O nanoparticles were evenly distributed on the surface of Sch. The prepared nanofibers have high oxidative removal performance for As(III) under visible light. In the PAN@AS0.10 system, the total As removal percent can reach 90.96% after 120 min irradiation at pH 4.0. The scavenger experiments confirmed that the main active substances of the PAN@AS0.10 system were h+ and •OH. The high oxidation and removal performance of the PAN@AS0.10 composite for As(III) was attributed to the effective separation of photogenerated electron-hole pairs and high adsorption capacity of Sch for As under acidic conditions. This research provides a new material for the oxidation and removal of pollutants in water [such as As(III)] and also provides a research basis for the preparation of recyclable photocatalysts.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·Vol. 29
·期 18
·e202203152
·
IF 4.3
Yan Long,Jie He,Hang Zhang,Yingkang Chen,Kang Liu,Junwei Fu,Hongmei Li,Li Zhu,Zhang Lin,Andrei Stefancu,Emiliano Cortes,Mingshan Zhu,Min Liu
Graphical Ag/Al 2 O 3 catalytic controllable synthesis of N-monomethylated amines by using CO 2 /H 2 as C 1 source has been demonstrated in a first example. The reactivity of methylated amines was reduced by the heterolytic dissociation of H 2 over the catalyst, and hence conversion of various amines to corresponding monomethylated amines was enabled with excellent selectivity. The selective synthesis of monomethylated amines with CO 2 is particularly challenging because the formation of tertiary amines is thermodynamically more favorable. Herein, a new strategy for the controllable synthesis of N-monomethylated amines from primary amines and CO 2 /H 2 is explored. First-principle calculations reveal that the dissociation of H 2 via an heterolytic route reduces the reactivity of methylated amines and thus inhibit successive methylation. In situ DRIFTS proves the process of formation and decomposition of ammonium salt by secondary amine reversible binding with H + on the Ag/Al 2 O 3 catalyst, thereby reducing its reactivity. Meanwhile, the energy barrier for the rate-determining step of monomethylation was much lower than that of overmethylation (0.34 eV vs. 0.58 eV) means amines monomethylation in preference to successive methylation. Under optimal reaction conditions, a variety of amines were converted to the corresponding monomethylated amines in good to excellent yields, and more than 90 % yield of product was obtained.
研究领域:
催化化学
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绿色化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·
IF 13.3
Zaihui Du,Longjiao Zhu,Pengfei Wang,Xinyue Lan,Shenghao Lin,Wentao Xu
Realizing high-precise and adjustable regulation of engineering nanozyme is important in nanotechnology. Here, Ag@Pt nanozymes with excellent peroxidase-like and antibacterial effects are designed and synthesized by nucleic acid and metal ions coordination-driven one-step rapid self-assembly. The adjustable NA-Ag@Pt nanozyme is synthesized within 4 min using single-stranded nucleic acid as templates, and peroxidase-like enhancing FNA-Ag@Pt nanozyme is received by regulating functional nucleic acids (FNA) based on NA-Ag@Pt nanozyme. Both Ag@Pt nanozymes that are developed not only has simple and general synthesis approaches, but also can produce artificial precise adjustment and possess dual-functional. Moreover, when lead ion-specific aptamers as FNA are introduced to NA-Ag@Pt nanozyme, the Pb 2+ aptasensor is successfully constructed by increasing electron conversion efficiency and improving the specificity of nanozyme. In addition, both nanozyme has good antibacterial properties, with ~100% and ~85% antibacterial efficiency against Escherichia coli and Staphylococcus aureus , respectively. This work provides a synthesis method of novelty dual-functional Ag@Pt nanozymes and successful application in metal ions detection and antibacterial agents.
研究领域:
纳米技术
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生物化学
·
医学检测
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产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Xinyue Wang,Huan Cheng,Yuanzhi Min,Xian Li,Lijun You,Jumei Li
In this study, a crystalline mesoporous ZrO 2 interlayer allowing for enrichment capability and photocatalytic activity was introduced to develop a novel magnetic Fe 3 O 4 /m-ZrO 2 /Ag nanocomposite combined with excellent SERS activity and photocatalytic property. The coverage of Ag nanoparticles on Fe 3 O 4 /m-ZrO 2 /Ag was well controlled to tune their SERS sensitivity by varying the feed amount of AgNO 3 . Several characterization methods were utilized to investigate their composition, morphology and crystal structure. The SERS experiments demonstrated Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites possessed markedly SERS sensitivity, exceptional signal reproducibility and excellent storing stability. They could sense R6G and Cr (VI) at the concentrations of 10 −9 and 5 × 10 −8 M, respectively. Beyond that, the Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites effectively accomplished recyclable detecting R6G and Cr (VI) in 5 cycles through facile photocatalytic removal of pollutants under UV irradiation. Altogether, the novel Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites prepared in this study have high SERS sensitivity and good photocatalytic performance, which is of great significance for environmental detection and ecological restoration.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Yun Mou,Hao Wang,Yang Peng,Jiaxin Liu,Hao Cheng,Qinglei Sun,Mingxiang Chen
Poor flexibility and high contact resistance of conductive films are primary roadblock for the incorporation of Ag flake ink into practical applications. In this work, a novel and inexpensive Ag flake/ion composite ink was prepared to directly achieve the thick conductive films with excellent performances at 100 °C. The effect of Ag ion content on the resistivity and microstructures of the modified conductive film was investigated, and the flexibility and relative resistance change of the modified conductive film were measured by the cyclic bending test and compared with the traditional Ag flake ink. Consequently, the modified conductive film sintered from Ag flake/ion-0.5 in. exhibits low electrical resistivity of 4.83 × 10 −5 Ω·cm, which is 42.9% lower than the Ag flake film sintered from the Ag flake ink, and the modified conductive film still displays smaller changes in resistivity and relative resistance after the cyclic bending tests. The enhanced conductivity and flexibility are attributed to the bridging effect of Ag nanoparticles (NPs) generated from the in–situ decomposition of Ag ion ink. These results demonstrate that the low-cost Ag flake/ion composite ink provides a tempting prospect for fabricating high-quality flexible printed electronics at low temperature.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2020
·
IF 5.289
Wei Wang,Yaping Liu,Gang Wang,Caiwang Tan,Wei Cao
In this study, the carbon fiber reinforced ZrB 2 -SiC composite ceramic was joined to Ti6Al4V alloy with Ag-Cu eutectic alloy filler at varied holding time and a fixed temperature of 800℃. Interface microstructure and shear strength of brazing joints were studied. The brazed ZSC f ceramics/AgCu/TC4 alloy is endowed with good metallurgical bondings. A typical interfacial structure of joints brazed for 10 min was found as ZSC f /TiC/Ti 5 Si 3 /Ag(s,s)/Cu(s,s) + TiC/TiCu/Ti 2 Cu/(TiC + TiCu)/TC4 alloy. Increase of holding time did not vary the precipitated phase of the joints but decreased thickness of the Ag(s, s) and Cu(s, s) reaction layer and gradually thickened the Ti-Cu reaction layer near the TC4 side. The formation process of reaction products was discussed in detail. The holding time substantially influenced shear strength of the joints. A maximum shear strength of 39 MPa was reached at a brazing time of 20 min.
研究领域:
材料科学
·
焊接工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Hengxuan Li,Minghui Chen,Ran Luo,Weipan Peng,Xiaoqun Gong,Jin Chang
Ag is widely distributed in nature and it is used in almost all areas of human life. However, due to the widespread use of Ag materials, Ag + pollution seriously threatens the human health and environment. The traditional detection methods for Ag + suffer from disadvantages including high operational cost, complicated operating unit and instrument, and high requirements for professionals. Thus, in this study, a new type of Ag + detection biosensor based on the hybridization signal amplification was designed to overcome these problems. Combining cytosine-Ag + -cytosine mismatch structure with the hybridization chain reaction, this biosensor converted the conventional detection signal into the nucleic acid amplification signal, which realized efficient, rapid, sensitive, and specific detection of Ag + . The limit-of-detection of this sensor reached 0.69 pM, which is much less than the maximum concentration (0.1 mg L −1 , 927 nM) suggested for drinking water by the World Health Organization, and the maximum concentration (0.05 mg L −1 , 464 nM) suggested by the United States Environmental Protection Agency. This method provides a promising new platform for detecting Ag + concentrations at ultralow levels.
研究领域:
生物化学
·
环境科学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Runmian Ming,Cailing Zhang,Liangbo Xie,Jing Chang,Yi Li
Although gold (Au) plays an important role in many fields, the residual Au3+ ion in our natural environment is one of the most noxious heavy metal ions for animals and plants. It is of great significance to develop an efficient and simple detection method for Au3+. Based on heterogeneous catalytic activation of peroxymonosulfate (PMS) by Ag@Cu2O nanoparticles (Ag@Cu2O NPs), a novel, visible and convenient strategy for Au3+ detection was developed. The well-dispersive Ag@Cu2O NPs could catalyze PMS to produce sulfate radicals (SO4•−) and hydroxyl radicals (·OH) which could oxide 3, 3′, 5, 5′-tetramethylbenzidine (TMB) into oxidized TMB (oxTMB) in colorimetric detection. The introduced Au3+ could effectively enhance catalytic activation of PMS to produce more SO4•− and ·OH. This was because there was the synergistic effect of Au and CuO, which reduced the charge transfer resistance and promoted electron transfer. This method had good specificity against 22 types of cationic or anionic interfering ions and the detection limit of Au3+ was about 290 nmol·L−1. In this study, a new substrate of PMS was used for colorimetric detection of heavy metal ions, and the catalytic synergy of Au and CuO in PMS/Ag@Cu2O NPs/Au3+ colorimetric detection system was analyzed in detail.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）