查找使用阿拉丁产品的科研文献

Lotus leaf inspired dual-functional SERS substrate: Ag NIs-decorated PDMS micropillar/wrinkle hierarchical structure for on-site detection of pesticides on fruit surface and in environmental water

Ziyang Bian,Lili Huang,Zetong Li,Jie Wang,Yue Wang,Zhenshan Yang,Hefu Li

The development of versatile surface-enhanced Raman scattering (SERS) platforms facilitates the rapid identification of contaminants in diverse application scenarios. Herein, a dual-functional SERS substrate comprising silver nanoislands-decorated micropillar/wrinkle hierarchical structure (Ag NIs@PWHS) on a polydimethylsiloxane (PDMS) film was fabricated through an amalgamation of fabrication techniques: soft lithography, surface wrinkling, and magnetron sputtering. The PDMS hierarchical architecture was constructed by replicating mastoid structures of lotus leaves through a two-step molding process, followed by the formation of periodic wrinkles via oxygen plasma treatment. This hierarchical design integrating micropillars and wrinkles not only provided a multiscale surface architecture conducive to the formation of three-dimensional (3D) hot spots, but also conferred hydrophobicity and bending insensitivity on the SERS substrate. The optimal Ag NIs@PWHS substrate had an analytical enhancement factor of 1.99 × 10 6 , outstanding signal uniformity (relative standard deviation, RSD = 2.98 %) and reproducibility (RSD = 4.54 %), and robust mechanical stability. Furthermore, the Ag NIs@PWHS substrate enabled the rapid detection of thiram on pear surface and malachite green in lake water, with a detection sensitivity of 10 −7 M for both pesticides. Thus, the developed Ag NIs@PWHS SERS substrate holds significant potential for utilization in realms of food safety assessments and water pollution surveillance.

Core-shell structure and twin-cone morphology of Au@Ag@HOF with efficient adsorption capability and high SERS enhancement efficiency for sensitive detection of bisphenol compounds in food

Xiaoyu Yang,Shunbi Xie,Weifen Wu,Jingwen Liu,Manjun Liao,Runzi Zhang,Yao Liu,Mengjun Wang,Yi He

In SERS analysis, SERS substrates often suffer from uneven “hot spot” distribution, poor stability, and susceptibility to oxidation and aggregation, which limit detection precision and accuracy. To overcome these aggregation, this study presents a novel core-shell Au@Ag@hydrogen-bonded organic framework twin cone (Au@Ag@HOF TCs) as efficient SERS substrate. The HOF shell effectively protects Au and Ag from oxidation, thereby enhancing the long-term stability of the SERS substrate. It also prevents signal inhomogeneity caused by noble metal nanoparticle agglomeration and captures target molecules at “hotspots” for maximum Raman enhancement. Leveraging these features, the proposed Au@Ag@HOF TCs enable sensitive detection of bisphenol A, F, and S in food, with detection limits of 1.8033 × 10 −9  M, 4.2170 × 10 −9  M, and 2.0815 × 10 −10  M, respectively. Furthermore, this substrate was successfully applied to analyze real samples, including canned soup, beverages, and milk, demonstrating its potential for the detection of bisphenol compounds in food.

Design and assembly of Ag-decorated Bi2O3 @ 3D MXene Schottky heterojunction for the highly permeable and multiple-antifouling of fibrous membrane in the purification of complex emulsified oil pollutants

Yingqing Zhan,Ximin Chen,Ao Sun,Hongshan Jia,Yucheng Liu,Lingli Li,Yu-Hsuan Chiao,Xulin Yang,Fei Zhu

Membrane separation technology has potential for purifying emulsified oily wastewater. However, the oils, soluble organic substances, and microorganisms can cause complex membrane fouling problems, thereby reducing the separation efficiency and service life. Herein, a highly permeable and multiple-antifouling composite membrane was prepared using porous PAN fibrous mat as support backbone for the assembly of Ag-decorated Bi 2 O 3 @ 3D MXene Schottky heterojunction and hydrophilic TA as the adhesive. The unique arrangement of 3D MXene heterojunction and hydrophilic functionalization effectively broke through the limitation of separation flux and synergistically enhanced the anti-fouling performance of membrane. Such fibrous composite membrane achieved an exceedingly high permeability (2717–3328 L·m −2 ·h −1 ) for various emulsified oils, while ensuring excellent oil/water emulsion retention rate (99.59%) and good cycle stability. Meanwhile, the composite membrane displayed favorable photocatalytic degradation performance toward degrading MeB (96.1%) and antibacterial ability. Furthermore, the MD simulation and free radical trapping experiments were carried out to unravel the molecular interactions during the separation process and the photocatalytic mechanism of composite membrane, respectively. Overall, the combination of photocatalytic self-cleaning, anti-oil adhesion, and antibacterial effect renders the membrane high permeability and multiple-antifouling performance, which provides a new strategy for dealing with complex oily wastewater in petrochemical industry .

A Novel 3D Hierarchical Plasmonic Functional Cu@Co3O4@Ag Array as Intelligent SERS Sensing Platform with Trace Droplet Rapid Detection Ability for Pesticide Residue Detection on Fruits and Vegetables

Guanliang Sun,Ning Li,Dan Wang,Guanchen Xu,Xingshuang Zhang,Hongyu Gong,Dongwei Li,Yong Li,Huaipeng Pang,Meng Gao,Xiu Liang

Rapid and effective detection of pesticide residues from complex surfaces of fruits and vegetables has important significance. Herein, we report a novel three-dimensional (3D) hierarchical porous functional surface-enhanced Raman scattering (SERS) substrate, which is fabricated by successive two-step hydrothermal synthesis strategy of silver nanoparticles (Ag NPs) and cobalt oxide nanowires (Co3O4NWs) on the 3D copper foam framework as Cu@Co3O4@Ag-H. The strategy offers a new avenue for localized plasmonic materials distribution and construction, which exhibits better morphology regulation ability and SERS activity (or hotspots engineering) than physical spurring obtained Cu@Co3O4@Ag-S. The developed Cu@Co3O4@Ag-H possesses large surface area and rich hotspots, which contributes to the excellent SERS performance, including homogeneity (RSD of 7.8%), sensitivity (enhancement factor, EF of 2.24 × 108) and stability. The Cu@Co3O4@Ag-H not only provides plenty of Electromagnetic enhancement (EM) hotspots but also the trace detection capability for droplet rapid sensing within 2 s. Cu@Co3O4@Ag-H substrate is further developed as an effective SERS sensing platform for pesticide residues detection on the surfaces of fruits and vegetables with excellent LOD of 0.1 ppm, which is lower than the most similar reported works. This work offers new potential for bioassay, disease POCT diagnosis, national security, wearable flexible devices, energy storage and other related fields.Keywords:surface-enhanced Raman scattering;Cu@Co3O4@Ag;trace droplet;pesticide residues;3D hierarchical plasmonic nanomaterials;Cu foam framework

Ag/APTES/CuxO (x = 1, 2)-MGS-Coated No-Core Fiber Surface Plasmon Resonance Gas Sensor and Its Application in Hydrogen Sulfide Detection

Cheng Li,Liu Xiao,Xiaozhan Yang,Wenlin Feng

A phenanthro[9,10-d]imidazole-based AIE active fluorescence probe for sequential detection of Ag+/AgNPs and SCN− in water and saliva samples and its application in living cells

Fanqiang Bu,Bing Zhao,Wei Kan,Liyan Wang,Bo Song,Jianxin Wang,Zhe Zhang,Qigang Deng,Guangming Yin

Ag + and SCN − play extremely important roles in the fields of the physiology and environment. In this work, on the basis of phenanthro[9,10- d ]imidazole derivative ( DIPIP ) which can exhibit the aggregation-induced emission (AIE) properties in aqueous solution, we achieved a sequential on-off-on switch for Ag + and SCN − with high selectivity and sensitivity. A remarkable fluorescence quenching effect of Ag + on the probe DIPIP was observed with 1:2 stoichiometry , Subsequently, the fluorescence intensity of in situ generated DIPIP -Ag + ensemble was easily switched on after the interaction between Ag + and SCN − , which was attributed to the stronger affinity of SCN − to capture Ag + . In particular, the extreme limits of detection (LOD) for Ag + and SCN − in standard solutions were as low as to be 74.5 nM and 7.8 nM, respectively. Furthermore, the probe DIPIP and the DIPIP -Ag + ensemble could be used to detect Ag + in the real water and SCN − in smoker saliva samples, respectively. In addition, the sequential “on-off-on” fluorescence mode of DIPIP to Ag + and SCN − were also successfully applied in living HeLa cells.

Facile On-Site Aqueous Pollutant Monitoring Using a Flexible, Ultralight, and Robust Surface-Enhanced Raman Spectroscopy Substrate: Interface Self-Assembly of Au@Ag Nanocubes on a Polyvinyl Chloride Template

Lu-Bin Zhong,Qing Liu,Peng Wu,Qi-Feng Niu,Huan Zhang,Yu-Ming Zheng

Aquatic ecosystems and human health have been seriously threatened by illegal discharge of wastewater, while simple and effective monitoring methods are still sparse. Here, we propose a facile method for on-site pollutant monitoring by surface-enhanced Raman spectroscopy with a novel substrate. This substrate is fabricated by interface self-assembly of Au@Ag nanocubes (NCs) on a simultaneously formed polyvinyl chloride (PVC) template, followed by coating with a thin Au film. The Au@Ag@Au-NCs/PVC film is flexible, ultralight, and robust and could float on the surface of water and firmly contact with water even under harsh environmental conditions. Moreover, the Au@Ag@Au-NCs/PVC film is translucent, allowing penetration of laser beams and enhancement of Raman signals. When thiram was used as a model contaminant in aqueous solution, a good linear relationship (R2 = 0.972) was obtained over the range of 0.1–50 ppb with a detection limit of 0.1 ppb. Raman signals of thiram can be instantly and consecutively detected with the enhancement of the film in the simulated experiments, suggesting its possible use in the long run. Furthermore, the film can be easily regenerated by NaBH4 solution washing, which could reduce the operating cost. In summary, the Au@Ag@Au-NCs/PVC film has great potential in on-site pollutant monitoring in aqueous environments with a portable Raman spectrometer.

Red emission nitrogen, boron, sulfur co-doped carbon dots for “on-off-on” fluorescent mode detection of Ag+ ions and l-cysteine in complex biological fluids and living cells

Shan Huang,Erli Yang,Jiandong Yao,Yi Liu,Qi Xiao

Herein, a simple and efficient fluorescent assay for Ag + ions and l -cysteine (L-Cys) in complex biological fluids and living cells was first developed based on the fluorescent “on-off-on” mode of red emission nitrogen, boron, sulfur co-doped carbon dots (NBS-CDs). Red emission NBS-CDs were prepared via one-step hydrothermal synthesis by using 3-aminobenzeneboronic acid and 2,5-diaminobenzenesulfonic acid as precursors. Such NBS-CDs exhibited excellent optical properties and relatively high absolute fluorescent quantum yield compared with some reported NBS-CDs. Due to the strong quenching ability of Ag + ions on the fluorescence of NBS-CDs, red emission NBS-CDs were used for the determination of Ag + ions with high sensitivity and excellent selectivity . The fluorescence of NBS-CDs was recovered after the interaction between Ag + ions and L-Cys, which realized the specific determination of L-Cys in human urine samples and human plasma samples. The established NBS-CDs-based fluorescent “on-off-on” sensor offered a relatively low detection limits of 0.35 μM for Ag + ions and 0.045 μM for L-Cys based on three times signal-to-noise criteria. Notably, this strategy was applied for the visual detections of Ag + ions and L-Cys in living human cancer cells (HeLa cells and MCF-7 cells). This method is simple, high sensitive, and excellent selectivity, which provided a new insight on the potential applications of NBS-CDs to develop the biosensor in clinical diagnosis and other biologically related areas.

In situ growth of Ag nanoparticles on the surface of MXene by γ-ray irradiation to fabricate EVA composite: the improvement of flame retardancy, smoke suppression, and mechanical properties

Siyi Xu,Danyi Li,Wenrui Wang,Lin Lin,Ying Sun,Jihao Li,Linfan Li

A large amount of toxic smoke and heat generated by the combustion of ethylene vinyl acetate copolymer (EVA) poses a significant threat to human fire escape evacuation. This work aims to use γ-ray to prepare e-MXene@Ag hybrid flame-retardant materials by the method of in-situ reduction, and EVA composites are prepared by melt blending to reduce the smoke and toxic gases produced during combustion significantly. Compared with pure EVA, the total heat release, total smoke release, and the production rate of CO and CO2 produced by the combustion of EVA composite with 1 wt% e-MXene@Ag1.0 decreased by 30.3%, 33.3%, 18.2%, and 20.1% respectively. The fire hazard reduction of EVA composite materials was due to the physical barrier, catalytic carbonization and adsorption of the e-MXene@Ag1.0 hybrid. In addition, e-MXene@Ag1.0 can also further increase the mechanical properties of EVA composites due to its own 'multi-contact point limit structure'.

Fabrication of Ag@m-MIL-100(Fe)/β-FeOOH/PVDF Membranes via a Two-Step Method Combining Hydrothermal Growth and Photochemical Substitution for Enhanced Photocatalytic and Anti-Fouling Performance

Zhengang Bu,Jianhua Li,Siqi Fang,Yuanlin Zhan,Wenzhuo He,Yibin Huang

The uniform and stable deposition of metal-organic frameworks (MOFs) onto membranes without compromising their performance presents a significant challenge. This study reports the fabrication of a photocatalytic self-cleaning membrane using hydrothermal and photochemical substitution methods. These methods enabled the uniform and stable deposition of β-FeOOH nanorods, m-MIL-100(Fe), and Ag nanoparticles (NPs) not only on the members surface but also throughout the interior of polyvinylidene fluoride (PVDF) membrane pores. The synergistic effect of these materials and their uniform and stable distribution within the PVDF membrane resulted in superior photocatalytic efficacy. The membrane's excellent photocatalytic performance facilitated the degradation of most pollutants, ensuring prolonged usage. Unlike other photocatalytic membranes requiring additional cocatalysts, our membrane degraded over 90% of various dyes without H 2 O 2 , demonstrating a greener usage mode and higher photocatalytic efficiency. The valence band (VB) and conduction band (CB) of β-FeOOH nanorods and m-MIL-100(Fe) were calculated, confirming the existence of a type-II heterojunction for the first time. Free radical trapping experiments identified hydroxyl radicals (·OH) as the primary reactive species in the degradation process. This research provides a novel approach to uniformly and stably load MOFs on membranes, enhancing their properties and offering insights into fabricating multifunctional photocatalytic membranes.

Using supercritical carbon dioxide to synthesize polymer nanospheres with an open hole on the surface and the application of spatially structured PS/P(DVB-co-MAA)@Fe3O4/TA@Ag nanocomposites

Qianrui Xu,Pengcheng Gao,Yang Wang,Wenjie Jiang,Zhifei Wang,Yong Jiang,Zhen Jiao

Porous nanospheres have potential applications in reactions, catalysis and water treatment because of their high surface area, low density and high loading capacity. In this work, a reproducible and well-controlled way to fabricate hollow Polystyrene/Poly(divinylbenzene-co-methacrylic acid)@Fe 3 O 4 /Tannic acid@Ag (PS/P(DVB-co-MAA)@Fe 3 O 4 /TA@Ag) nanocomposites with high catalytic efficiency is developed. Firstly, hollow Polystyrene/Poly(divinylbenzene-co-methacrylic acid) (PS/P(DVB-co-MAA)) nanospheres with an open hole on the surface are produced by supercritical carbon dioxide (scCO 2 ) rapid depressurization methodology. The consequence shows that structure of polymer nanospheres is controllable by altering the reactive conditions, like temperature, pressure, solvent ratio, degree of cross-linking and time. Secondly, the magnetic Fe 3 O 4 and Ag nanoparticles are deposited onto the surface of hollow PS/P(DVB-co-MAA) nanospheres. The result indicates that hollow PS/P(DVB-co-MAA)@Fe 3 O 4 /TA@Ag nanocomposites are highly efficient in degrading dyes, displaying that the apparent rate coefficients of methylene blue (MB), rhodamine B (RhB) and 4-nitrophenol (4-NP) reduction are .0090 s −1 , 0.0239 s −1 , and 0.0073 s −1 , respectively. Besides, hollow PS/P(DVB-co-MAA)@Fe 3 O 4 /TA@Ag nanocomposites can be recycled at least seven times and show no significant loss in catalytic performance.

Quantitative detection of microcystin-LR in Bellamya aeruginosa by thin-layer chromatography coupled with surface-enhanced Raman spectroscopy based on in-situ ZIF-67/Ag NPs/Au NWs composite substrate

Jing Jiang,Min Liu,Dalun Xu,Tao Jiang,Jinjie Zhang

As a hypertoxic natural toxin, the risk of Microcystin-leucine-arginine (MC-LR) residues in Bellamya aeruginosa deserves more attention. Herein, employing the conventional thin-layer chromatography (TLC) technology and a novel surface-enhanced Raman scattering (SERS) substrate, a TLC-SERS chip was fabricated for the purification and quantitative detection of MC-LR in complex samples. The substrate exhibited excellent SERS performance with an enhancement factor of 6.6 × 10 7 , a low detection limit of 2.27 × 10 −9  mM for MC-LR, excellent uniformity and reproducibility, as well as a wide linear range. With the application of TLC, the MC-LR was efficiently purified and the concentration was increased to >3 times. Ultimately, recovery rates fluctuated between 93.28% and 101.66% were obtained from the TLC-SERS chip. On balance, the TLC-SERS chip has a robust capacity for achieving rapid and stable quantitative detection of MC-LR, which promises to improve the efficiency of food safety monitoring.