SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2017
·
IF 2.536
Yu-Feng Zhu,Yong-Sheng Wang,Bin Zhou,Yan-Qin Huang,Xue-Jiao Li,Si-Han Chen,Xiao-Feng Wang,Xian Tang
We for the first time confirmed that the low concentrations of Ag(I) could induce a silver specific aptamer probe (SAP) from a random coil sequence form to G-quadruplex structure. Thereby, a novel highly sensitive fluorescence strategy for silver(I) assay was established. The designed multifunctional SAP could act as a recognition element for Ag(I) and a signal reporter. The use of such a SAP can ultrasensitively and selectively detect Ag(I), giving a detection limit down to 0.64 nM. This is much lower than those reported by related literatures. This strategy has been applied successfully for the detection of Ag(I) in real samples, further proving its reliability. Taken together, the designed SAP is not only a useful recognition and signal probe for silver, but also gives a platform to study the interaction of monovalent cations with DNA .
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
·
IF 7.664
Qiang Gao,Jianbin Qin,Borui Guo,Xun Fan,Fangping Wang,Yu Zhang,Ronglin Xiao,Fei Huang,Xuetao Shi,Guangcheng Zhang
In order to prepare the high-performance electromagnetic interference (EMI) shielding materials to cope with the increasingly serious electromagnetic (EM) radiation pollution situation, in this work, epoxy/Ag nanowire/thermal annealed graphene aerogel composites (EP/AgNW/TAGA) with three-dimensional (3D) bicontinuous conductive skeleton are prepared through a vacuum-assisted impregnation method. By introducing the one-dimensional (1D) AgNW on two-dimensional (2D) graphene and welding the AgNW during hydrothermal reduction and thermal annealing process, the electrical conductivity of EP/AgNW/TAGA are greatly enhanced from 26.5 S/m to the highest value of 595.7 S/m. Besides, the EP/AgNW/TAGA achieve the highest EMI shielding effectiveness (EMI SE) value of 84.01 dB in X-band and absorption-dominate shielding mechanism. Moreover, the compressive strength of composites reached 173.54 MPa, which shows the great application value as high-performance EMI shielding material in fields like construction, aerospace and electronics field.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Siying Li,Rong Zhang,Junlan Xie,Dur E. Sameen,Saeed Ahmed,Jianwu Dai,Wen Qin,Suqing Li,Yaowen Liu
In this study, poly(vinyl alcohol) (PVA) membranes containing Ag nanoparticles (AgNPs) were prepared by electrospinning and grafted copolymerization with 3,3′,4,4′-benzophenone tetracarboxylic acid (BPTA) to provide better mechanical properties, lower water vapor transmittance, and higher antibacterial activity (against Staphylococcus aureus and Escherichia coli ) than the PVA/AgNPs membrane. The PVA/AgNPs/BPTA membrane showed higher antibacterial activity than the other membranes, and it produced inhibition zones with diameters of 18.12 ± 0.08 and 16.41 ± 0.05 mm against S. aureus and E. coli , respectively. The PVA/AgNPs/BPTA membrane was found to be capable of promoting reactive oxygen species (ROS) formation under both light and dark conditions. Cycling experiments performed following ROS quenching showed that the best-performing composite membrane retained >70% of its original OH⋅ radical and H 2 O 2 charging capacity after seven cycles. In the filtration test, the electrospun nanofibrous membranes showed high filtration efficiencies of 99.98% for sodium chloride (NaCl). In addition, these membranes maintained a relatively low pressure drop of 168 Pa with a basis weight of 2.1 g m −2 . Thus, the PVA/AgNPs/BPTA membrane was concluded to be a promising medical protective material offering the benefits of structural stability and reusability.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zixia Tang,Hong Tao,Xiao Wang,Lu Chen,Chi Song,Guanhong Lu,Xiaofeng Xie,Jing Sun
The implantation of metal nanoparticles (MNPs) into metal–organic framework (MOF) hosts is a promising means to prepare high-performance photocatalysts for the degradation of gas pollutants. However, the uniform encapsulation of MNPs in MOFs is still challenging. Herein, a facile “quasi-in situ” encapsulation method is proposed by utilizing the spatial confinement effect of the colloidal network formed during the synthesis of the MIL-100(Fe) monolith [noted as m-MIL-100(Fe)]. Highly dispersed Ag NPs with an average diameter of ∼2 nm are encapsulated in the MIL-100(Fe) monolith to form a unique “watermelon-seed” structure, which ensures the large contact area between the two components and protects Ag NPs from being oxidized. The fast charge transfer between m-MIL-100(Fe) and Ag NPs enables the spatial separation of electron–hole pairs and promotes the generation of oxidative radicals. Compared with pristine m-MIL-100(Fe), the 0.2 wt % Ag@m-MIL-100(Fe) composite shows obviously enhanced photodegradation efficiencies for flowing o-xylene under both xenon (∼97%) and visible light (∼80.0%) with high stability. This work not only provides a promising Ag@m-MIL-100(Fe) material for eliminating air pollutants but also gives a versatile means for the design and synthesis of nanoparticles@MOFs composites with desired performance.
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TALANTA
·
2012
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IF 3.794
Shenfei Zong,Zhuyuan Wang,Jing Yang,Chunlei Wang,Shuhong Xu,Yiping Cui
We report a dual mode cancer cell targeting probe based on CdTe quantum dots (QDs) conjugated, silica coated [email protected] core–shell nanorods ( [email protected] NRs), which can generate both surface enhanced Raman scattering (SERS) and fluorescence signals. In such a probe, folic acid (FA) is used as a targeting ligand for folate receptors (FRs) overexpressed cancer cells. To synthesize the probe, [email protected] NRs were first prepared to serve as the SERS substrates by coating an Ag shell on the gold nanorods. Then the [email protected] NRs were labeled with 4-mercaptobenzoic acid (4MBA) to generate SERS signals, followed by being coated with a silica shell through a modified Stöber method. Finally, CdTe QDs and FA were conjugated to the silica coated [email protected] NRs by the carbodiimide chemistry to yield fluorescence and the targeting ability, respectively. To validate the targeting capability of the probe, in vitro experiments were conducted, using HeLa cells with overexpressed FRs as the model target cells and MRC-5 cells with a low folate receptor expression level as the negative control. Both the fluorescence imaging and the SERS mapping results confirmed that the proposed probe can be used as an efficient cancer cell targeting agent. This kind of multifunctional probe has great potential in the diagnosis and therapeutics of cancerous diseases due to its specific targeting and multiplex imaging abilities, especially in the simultaneous tracking of multiple components in a hybrid bio-system.
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Nanomaterials
·
2019
·Vol. 10
·期 1
·1
·
IF 4.034
Rui Geng,Juanjuan Yin,Jingxin Zhou,Tifeng Jiao,Yao Feng,Lexin Zhang,Yan Chen,Zhenhua Bai,Qiuming Peng
The construction of heterojunctions provides a promising strategy to improve photocatalytic hydrogen evolution. However, how to fabricate a nanoscale TiO2/g-C3N4heterostructure and hinder the aggregation of bulk g-C3N4using simple methods remains a challenge. In this work, we use a simple in situ construction method to design a heterojunction model based on molecular self-assembly, which uses a small molecule matrix for self-integration, including coordination donors (AgNO3), inorganic titanium source (Ti(SO4)2) and g-C3N4precursor (melamine). The self-assembled porous g-C3N4nanotube can hamper carrier aggregation and it provides numerous catalytic active sites, mainly via the coordination of Ag+ions. Meanwhile, the TiO2NPs are easily mineralized on the nanotube template in dispersive distribution to form a heterostructure via an N–Ti bond of protonation, which contributes to shortening the interfacial carrier transport, resulting in enhanced electron-hole pairs separation. Originating from all of the above synergistic effects, the obtained Ag/TiO2/g-C3N4heterogenous photocatalysts exhibit an enhanced H2evolution rate with excellent sustainability 20.6-fold-over pure g-C3N4. Our report provides a feasible and simple strategy to fabricate a nanoscale heterojunction incorporating g-C3N4, and has great potential in environmental protection and water splitting.Keywords:heterojunction;Ag/TiO2/g-C3N4;Co-assembly;hydrogen evolution
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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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产品关联
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高影响因子
ANALYST
·
2022
·Vol. 147
·期 7
·1385-1393
·
IF 5.227
Dongzhen Chen,Yang Li,Lijun Wang,Yingjie Wang,Pan Ning,Powan Shum,Xinhai He,Tao Fu
Biological surface-enhanced Raman scattering (SERS) sensing is dependent on the properties of the sensing surface. For the biological sensing surfaces for SERS, the hydrophilicity, biocompatibility and signal sensitivity are pivotal. Hence, a hard bimetallic Mo–Ag film was developed by a magnetron sputtering technique, and the surface morphology could be controlled by the relative contents of Mo and Ag. The Mo–Ag film has better hydrophilicity than the pure Ag film, which could be beneficial for cell attachment during biological SERS sensing. Moreover, the cell test shows that the Mo–Ag film exhibits good cytocompatibility with MC3T3-E1 cells, which shows potential for SERS detection in vivo. The high surface roughness of the Mo–Ag film is a fascinating feature for enhancing Raman scattering signals. Through depositing a thin film of Mo–Ag on a glass surface with a size of 0.5 × 0.5 cm2, a sensing chip of SERS could be produced. High sensitivity and excellent signal reproducibility were acquired. The sensitivity was down to 10−10 mol L−1 for malachite green and 10−9 mol L−1 for thiram, and the relative standard deviation value was lower than 7.0%. Moreover, bacteria were detected by employing the Mo–Ag film chip, and the difference in signal uniformity between molecules and bacteria is illustrated. In summary, depositing the Mo–Ag film on the surface of sensors could be an effective strategy for biomedical SERS sensing.
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RSC Advances
·
2021
·Vol. 11
·期 22
·13193-13200
·
IF 3.361
Nannan Zhang,Yuxi Meng,Yuxue Ning,Andrew E. H. Wheatley,Fang Chai
The enormous and urgent need to explore cost-effective catalysts with high efficiency has always been at the forefront of environmental protection and remediation research. This work develops a novel strategy for the fabrication of reusable CuO-based non-noble metal nanomaterials as high-efficiency catalysts. We report a facile and eco-friendly synthesis of CuO hexapods and CuO–Ag composite using uric acid as a reductant and protectant. Both exhibited high catalytic activity in the hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by sodium borohydride (NaBH4), with the CuO–Ag composite showing superior catalytic performance. Notably, the highest turnover frequency of CuO–Ag reached 7.97 × 10−2 s−1, which was much higher than numerous noble-metal nanomaterials. In addition, CuO hexapods and CuO–Ag composite were also shown to act as highly efficient and recyclable catalysts in the degeneration of 4-NP. Both CuO hexapods and the CuO–Ag composite exhibited outstanding catalytic durability, with no significant loss of activity over more than 10 cycles in the hydrogenation of 4-NP.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Jianjun Du,Tao Zhu,Quanyong Gu,Wenbing Cao,Jiangli Fan,Xiaojun Peng
Green fluorescent protein (GFP) becomes one of the most important imaging tools in biology and biomedicine. To simplify usage, expand the application and avoid complicated operations, a kind of artificial fluorescent protein (AFP) is inspired and fabricated by lighting up human serum albumin (HSA) with loading microenvironment-sensitive fluorescent dye DMAR , which could be applied in HSA assay in human urine and serum samples as a physiological indicator of diagnosis in clinical. Besides, the AFP, DMAR /HSA, could act as a nanosensor for Ag + sensing with good selectivity by a new relay recognition strategy.
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高影响因子
Nanoscale
·
2014
·Vol. 6
·期 19
·11147-11156
·
IF 6.739
Guoxing Zhu,Chunlin Bao,Yuanjun Liu,Xiaoping Shen,Chunyan Xi,Zheng Xu,Zhenyuan Ji
Developing hybrid nanocrystals is a hot topic in materials science. Herein, a ternary hybrid nanocrystal, Ag–Ag2S–CdS, combining near infrared emission and photothermal conversion properties was demonstrated. The ternary Ag–Ag2S–CdS hybrid nanocrystals with cubic shape and uniform size were synthesized by a simple one-pot and one-step colloidal method. The growth process is self-regulated with the formation order of Ag2S, Ag, and CdS, sequentially. The formation of Ag originates from the partial reduction of Ag2S, while the formation of CdS is through an Ag2S catalytic mechanism based on its superionic feature. The obtained ternary hybrid nanocrystals show near infrared emission and photothermal conversion properties in a lab-on-a-particle system. Importantly, an enhanced effect is observed for the photothermal conversion, which is mainly due to the presence of heterointerfaces among the crystals. This work will not only advance the synthesis chemistry of multi-component hybrid nanocrystals but also provide a possible route for the design of advanced multi-model materials used in bio-related fields.
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RSC Advances
·
2014
·Vol. 4
·期 33
·17387-17392
·
IF 3.708
Wengfeng Zhu,Jian Zhang,Zhenchao Jiang,Weiwei Wang,Xiaoheng Liu
In this paper, bright and high-quality carbon dots (CDs) were prepared by refluxing a membranous carbonized β-cyclodextrin in nitric acid. The structure and optical properties of the CDs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), fluorescence spectrophotometry (FL), X-ray diffraction (XRD) and Raman spectroscopy. The mechanism for the formation of the CDs is also discussed. As-prepared CDs could be used as peroxidase mimics for the detection of H2O2. The results indicate that the CDs are capable of rapid and sensitive detection of H2O2 in the linear range from 2 × 10−6 to 5 × 10−4 mol L−1 and the limit of detection of H2O2 is as low as 1 × 10−6 mol L−1. More importantly, the peroxidase-like activity of the CDs is expanded to the detection of some oxidative ions (such as Fe3+ and Ag+). The linear ranges for Fe3+ and Ag+ were 8 × 10−6 to 1 × 10−4 mol L−1 and 5 × 10−6 to 1 × 10−4 mol L−1 respectively, with corresponding detection limits of 8 × 10−7 mol L−1 and 5 × 10−7 mol L−1 respectively.
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危险品化学品经营许可证（带存储）