JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Ling Zhou,Jie Yang,Xinyue Wang,Gao Song,Fan Lu,Lijun You,Jumei Li
A novel highly active surface enhanced Raman scattering (SERS) substrate of Ag nanoparticles decorated Ag@ZrO 2 composite nanosphere was prepared and characterized. A uniform ZrO 2 shell was firstly coated over Ag cores by sol-gel process using zirconium butoxide as Zr precursor to achieve Ag@ZrO 2 nanospheres and then Ag nanoparticles were in situ deposited on the Ag@ZrO 2 through the reduction of AgNO 3 to produce Ag@ZrO 2 @Ag composite nanospheres. The cover density of Ag nanoparticles on Ag@ZrO 2 @Ag nanospheres could be controlled by changing the concentration of AgNO 3 . TEM , FE-SEM, EDX, UV–vis and XRD analyses were used to characterize their morphology, structure and composition . The SERS property of Ag@ZrO 2 @Ag was evaluated using 4-mercaptobenzoic acid (4-MBA) as Raman probe molecules. The experimental results showed Ag@ZrO 2 @Ag nanospheres presented remarkably SERS activity, high signal reproducibility (RSD = 6.39%) and exceptional storing stability. Subsequently, the Ag@ZrO 2 @Ag nanospheres acted as SERS substrates to sense Cr (VI) in water at various concentrations, and the SERS results showed great linear correlation between SERS intensities and the concentration of Cr (VI) (R 2 = 0.97) with the detection limit of 0.5 μM, which is below the safety level (1 μM) in drinking water of United States Environmental Protection Agency. The Ag@ZrO 2 @Ag nanospheres were also successfully used to confirm the concentration of Cr (VI) in real industrial wastewater. These results demonstrated the extraordinary potential of Ag@ZrO 2 @Ag composite nanospheres serving as SERS substrates for trace and quantitative determination of Cr (VI) in environmental field.
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高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 27
·9274-9281
·
IF 4.174
He Li,Yu Zou,Jiang Jiang
Ag and CuO in the form of nanoparticles have been widely used in our daily life as antibacterial agents, through releasing Ag ions and generating reactive oxygen species (ROS). In this work, we demonstrate that by synthesizing Ag@CuO nanohybrids with core–shell configurations, their bactericidal activity can be synergistically enhanced compared to the respective constituents. Upon AM 1.5G light illumination for short durations, the measured minimum inhibitory concentrations of the Ag@CuO nanohybrids show a significant decrease against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacterial strains, requiring only 7% and 34% of those when conducted in the dark. The spread plate results demonstrate that with nanohybrid concentrations of 11.0 and 21.9 mg L−1, at least 7 orders of magnitude decrease in Escherichia coli and Staphylococcus aureus colony forming units is achieved, when the Ag@CuO nanohybrids are exposed to light illumination for 10 min. The effect of illumination is found to induce Ag+ release and enhance 1O2 generation, which act concertedly to facilitate the remarkable photo-enhanced bactericidal effect.
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PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 8
·e4428
·
IF 3.581
Songfang Zhao,Haobo Jiang,Jinhui Li,Xiangying Meng,Tianyu Chao,Zhe Zhang,Peng Zhang,Yongju Gao,Duxia Cao
Efficient and reusable nanocatalysts fabricated via a facile assembly are highly desirable for the cost-effective hydrogenation reduction. Inspired by a fishing process with a fishnet, multifunctional nanostructured catalysts are rationally designed to combine interesting features via the self-redox assembly of Fe 3 O 4 -Ag composites on reduced graphene oxide (rGO) (Fe 3 O 4 -Ag/rGO). In detail, Fe 3 O 4 nanoparticles (NPs) endow the ternary hybrids with superparamagnetism (21.42 emu g −1 ), facilitating catalysts to be separated from the reaction system. rGO could provide electron transfer pathways, enhancing catalytic activity. More interestingly, GO and Ag + could behave as oxidants to oxidize Fe 2+ for the in situ assembly of Fe 3 O 4 -Ag/rGO without any addition of reductant/oxidant or organic solvents, and AgNPs endow the ternary hybrids with excellent catalytic behaviour. Meaningfully, the bioinspired process enables the ternary hybrids to possess more abundant micro−/nanopores, larger surface area, and more amorphization. They exhibit exceptional catalytic performance, and could be recycled with excellent activity by means of convenient magnetic separation (at least 7 times). Moreover, the ternary hybrids could degrade methylene blue under UV light due to different valence states of Fe in Fe 3 O 4 . Therefore, the proposed bioinspired assembly and structure design for hierarchical catalysts would pave a promising way to assemble other catalysts.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Ting Xu,Shuang Wang,Tao Wang,Xin Li,Yanli Chen,Qiong Wu,Lili Yang,Xiaoyan Liu,Maobin Wei,Jian Cao
Coupling Ag NPs and direct Z-scheme heterojunction in Fe 3 O 4 @SiO 2 @ZnO-PDA-Ag photocatalysts (FSZ-PDA-Ag) were constructed via the self-polymerization of dopamine. The effects of the loading amounts of Ag NPs on the structure, morphologies, and properties of the photocatalysts were investigated. Under ultraviolet and visible light irradiation, FSZ-PDA-Ag5 exhibited superior photocatalytic activity for tetracycline degradation. Direct Z-scheme ZnO-PDA heterojunction formed in FSZ-PDA-Ag could promote the transfer efficiency of electrons, and then inhibit the recombination of photo-generated charges. Meanwhile, the appropriate load of Ag NPs acted as another conductive channel to further facilitate the electrons transfer , which could extend the lifetime of the photo-generated charges. Thus, the multiple pathways of electrons transfer resulted in the enhanced photocatalytic activity , the degradation mechanism of FSZ-PDA-Ag5 was explored in detail. Moreover, this photocatalyst possessed superior cycling stability and reusability for the wastewater purification. This study may provide a reference for designing efficient and stable photocatalysts.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2024
·
IF 2.4
Huan Wang,Zhengang Wu,Yingna Wei,Ying Chen,Xiao jie An,Jingwu Li,Zhiwu Wang,Yankun Liu,Hengyong Wei
Gastric cancer (GC) is a highly lethal malignancy, seriously threatening people's physical health. Accurate screening of gastric cancer could improve the survival rate of patients. Therefore, exploring noninvasive and efficient cancer screening methods for gastric cancer is of great significance. In the past few years, exosomes have received much attention for their potential in disease diagnosis and treatment. Here, the aim of this study was to explore the detection of serum exosomes via surface-enhanced Raman spectroscopy (SERS) technique based on TiN-Ag@Ag sol composite substrate, and its potential application in gastric cancer diagnosis is evaluated. Exosomes were extracted from the serum of 31 GC patients and 31 healthy controls (HC) using an exosome kit. This study used various machine learning algorithms such as principal component analysis linear discriminant analysis (PCA-LDA), partial least squares discriminant analysis (PLS-DA), support vector machine (SVM), and k-nearest neighbor (KNN) algorithm to analyze SERS spectra, in order to distinguish between HC and GC. The results show that the k-nearest neighbor algorithm performs the best in HC and GC classification. These results indicate that the combination of SERS and machine learning methods provides a new technological approach for gastric cancer screening. This study offers a new proposal for the universal applicability of analysis and identification with SERS of serum exosomes samples in clinical diagnosis.
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Materials Research Express
·
2018
·Vol. 5
·期 12
·125604
·
IF 1.151
Le Li,Minqiang Wang,Jun Guo,Minghui Cao,Hengwei Qiu,Zhi Yang
Ag/Graphene hybrids have become a popular research topic given their enhanced electronic, optical, mechanical, and electrochemical properties. Here, we present a simple and environmentally friendly approach for the synthesis of Ag/Graphene hybrids. Our approach employs graphite foil as the electrode and achieves electrochemical exfoliation under the power of alternating currents. AgNO3 acts as an Ag source, and regulates the generation of free radicals, such as HO·, thus controlling exfoliation, during the formation of Ag/Graphene hybrids. We systematically studied the process parameters that affect the Ag/Graphene hybrids structure, including the addition rate of AgNO3, the agitation rate of the electrolyte, and the temperature of the electrochemical exfoliation process. The as-prepared Ag/Graphene hybrids show excellent electromagnetic interference shielding effectiveness with an optimal value of up to 29.9 dB and with a smaller thickness of 0.257 mm under microwave frequencies of 8.0–12.0 GHz. Our method for the large-scale synthesis of Ag/Graphene hybrids method can be extended to the synthesis of other novel metal/graphene composite and provides an efficient approach for the hybridization of novel metals with graphene.
研究领域:
材料科学
·
电化学
·
纳米技术
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jungang He,Mohan Yuan,Xia Wang,Xiao Chen,Xiang Peng,Liuyong Hu,Xue Zhao,Jing Liu,Jinghui Li,Kanghua Li,Chao Chen,Jiang Tang
Photodetectors with a broad spectral range play significant roles in optoelectronic applications. Introducing impurity atoms with the desired energy levels in semiconductors is an effective way to extend the spectral response range of photodetectors . Here, we demonstrate an extrinsic photodetector by introducing Ag + cations in methylammonium lead bromide (MAPbBr 3 ). The 5 % Ag-doped MAPbBr 3 single crystals exhibit excellent response with a high responsivity up to 0.56 A/W, a high detectivity of 2.22 × 10 10 jones, and a high response speed of 0.30 s/0.12 s under 700 nm wavelength illumination. Moreover, by the detailed investigation of the crystallinity and energy level distribution, we find that the Pb 2+ in MAPbBr 3 crystals is partially substituted by the Ag + impurities, which form the sensitive centers and thus induce the extrinsic response by the photo-carriers transition from the valence band to the sensitive centers. These results extend the spectral response region of perovskite optoelectronic applications and indicate the role of doping impurities with the desired energy level in improving the extrinsic response.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Jie Yu,Yuwei Wang,Cong Qi,Wenjie Zhang
To improve the utilization efficiency of solar energy, Ag@Fe 3 O 4 core-shell nanoparticles with strong light absorption capacity were prepared, and showed good photothermal and photoelectric properties . Synergistic effects of nanoparticle concentration, light intensity and metal foam on photothermal and photoelectric properties were studied. The results showed that the SPR effect of nanoparticles improves the light absorption ability. Compared with deionized water , the addition of nanoparticles can increase the temperature by 6.10% and the power generation efficiency by 18.75%. When the concentration exceeds a certain range, the increase in concentration no longer plays a positive role. The increase of light intensity can increase the voltage and output power by up to 45.28% and 44.78%. However, it will increase the temperature gradient between the surface and the bottom of the nanofluids , increase the heat loss, and lead to a decrease in power generation efficiency . The synergistic effect of nanoparticles and metal foam can better improve the photothermal performance. The addition of metal foam can increase the power generation efficiency by 5.65%.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Acan Liu,Xiaodong Li,Wenxiao Zhang,Hui Yang,Xuemin Guo,Chunyan Lu,Haobo Yuan,Wei Ou-Yang,Junfeng Fang
Ag electrode is widely used in inverted perovskite solar cells (PSCs), but its easy reaction and corrosive nature with perovskite always induces severe stability issue. Here, from typical theory of metal anticorrosion, a chemical anticorrosion approach for Ag electrode in inverted PSCs through introducing 2-mercaptobenzothiazole (MBT) as a corrosion inhibitor is reported. MBT can strongly bond to Ag and form a compact [MBT-Ag] chain on Ag surface owing to its N atom in thiazolyl ring and exocyclic thiol groups. As a result, Ag anticorrosion ability is greatly enhanced by increasing the corrosion potential and decreasing the corrosion current, thus effectively inhibiting possible chemical reaction and corrosion between perovskite and Ag electrodes. PSCs containing MBT/Ag exhibit high efficiency of over 23% with good stability, retaining 95 ± 4.1% of initial efficiency after storage for 3800 h in glovebox. Importantly, resulting PSCs also show excellent thermal stability, maintaining 90 ± 1.8% of initial efficiency after aging for 900 h at 85 °C.
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ELECTROCHEMISTRY COMMUNICATIONS
·
2021
·
IF 4.724
Xiaobo Yang,Xili Tong,Xingchen Liu,Kaixi Li,Nianjun Yang
The performance of a direct methanol fuel cell (DMFC) is strongly dependent on the catalytic anode. A high-performance anode is expected to offer enhanced intrinsic activity and/or a large electrochemical surface area. Herein, a series of Ag-core/Pd-shell (Ag@Pd x , x = 1,3,5) catalysts are synthesized in which the thickness of the Pd shell is varied. Both tensional strain and electron transfer between the Ag core and the Pd shell are found to affect the intrinsic activity of these Ag@Pd x catalysts. Of these, the Ag@Pd 3 catalyst exhibits the best performance for the methanol oxidation reaction (MOR), showing 4.1 times higher mass activity and 2.6 times higher specific activity than a Pd/C catalyst. Furthermore, density functional theory calculations show that this high MOR performance stems from a stronger adsorption of CH 3 OH and OH on the Pd active sites. This catalyst is thus a promising candidate for inclusion in a high-performance DMFC.
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高影响因子
Plasmonics
·
2020
·Vol. 15
·期 6
·2061-2069
·
IF 2.335
Xu Runxiang,Yan Luting,Zhu Yanyun,Yin Lan,Song Xiaodong
Triangular Ag nanoplates have been synthesized via the seed-mediated method, which has good morphology and can be reproduced stably. The wavelength of local surface plasmon resonance (LSPR) can be easily controlled in the range of 500–900 nm. When triangular Ag nanoplates were applied to surface-enhanced Raman scattering (SERS) based on suspension aggregates and solid aggregates, the detection limit of rhodamine 6G (R6G) were greatly increased to 3.125 × 10 −7 M and 10 −11 M, respectively, and there was an excellent linear relationship between the intensity of Raman peak and the concentration of R6G. In addition, when the excitation light was tuned to the LSPR wavelength, the surface plasmon resonance will be excited to the maximum extent, and the enhanced electromagnetic field will maximize the Raman scattering. Furthermore, some progress has been made in the optimization of SERS by compounding graphene hydrogels in solid aggregates and adding mercapto polyethylene glycol in suspension aggregates.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2018
·
IF 3.997
Linhai Biao,Shengnan Tan,Xuewei Zhang,Jing Gao,Zhiguo Liu,Yujie Fu
Preparation of Ag nanoparticles with high antibacterial activities and low adverse effects is urgently needed to apply to the medical and consumer products. In this study, a facile, one-step hydrothermal method has been developed to synthesize proanthocyanidins-functionalized Ag nanoparticles in aqueous solution. UV absorption spectra measurement indicated that the obtained Ag nanomaterials are mainly spherical in shape. FTIR results implied that the poly flavonoids moiety of proanthocyanidins have specific interactions with the surface of Ag nanoparticles. HR-TEM and XRD determination revealed that the Ag nanoparticles had a shell-core structure and the Ag core possessed a highly crystalline structure. Antibacterial tests demonstrated that the proanthocyanidins-functionalized-Ag nanoparticles have high bactericidal efficiency against both bacterial and fungus. Further taking into account their excellent stability, the proanthocyanidins-functionalized Ag nanoparticles in present study have the potential to be applied to the products required for the long-acting antibacterial action.
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PubMed
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