Fabrication of Ag@TiO2 electrospinning nanofibrous felts as SERS substrate for direct and sensitive bacterial detection

Yang, Yan; Zhang, Zhijie; He, Yali; Wang, Zhihua; Zhao, Yanbao; Sun, Lei

doi:10.1016/j.snb.2018.05.129

Cited by 73 publications

(50 citation statements)

References 49 publications

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“…In our previous work, 21 − 23 we reported polymer nanofibers incorporated with Ag NPs or Ag NWs and verified the antibacterial and SERS activities for target molecules of 4-mercaptophenol (4-MPh). Subsequently, in order to achieve multifunctional applications of the nanofibrous membrane, we fabricated TiO 2 electrospinning substrates loaded with Ag NPs and provided not only a possibility for SERS detection of bacteria but also excellent antibacterial activities.…”

Section: Introductionmentioning

confidence: 64%

Highly Sensitive Surface-Enhanced Raman Spectroscopy Substrates of Ag@PAN Electrospinning Nanofibrous Membranes for Direct Detection of Bacteria

et al. 2020

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Surface-enhanced Raman spectroscopy (SERS) can be applied for biological detection because of its high sensitivity and noninvasiveness for analytes. Herein, we engineer plasmonic free-standing substrates composed of Ag nanoparticles (NPs) supported on polyacrylonitrile (PAN) electrospinning nanofibrous felts as sensors for bacterial detection. Ag NPs are evenly distributed on PAN nanofibers after preimpregnation and impregnation of PAN nanofibers in Tollens’ reagent. The size and loading density of Ag NPs are tunable by adjusting the reaction time of glucose and Tollens’ reagent, thereby allowing the tuning of the surface plasmon resonance. Using 4-mercaptophenol (4-MPh) and 4-mercaptobenzoic acid (4-MBA) as probe molecules, SERS effects of Ag@PAN composite nanofibers are investigated, and the substrates allow the detection of 4-MPh and 4-MBA at a low concentration of 10 –9 mol/L. Importantly, the substrates exhibit a high sensitivity of SERS performance for bacterial identification without a specific bacteria–aptamer conjugation. The SERS substrates also show good uniformity of SERS response for bacterial organelles. Furthermore, the antimicrobial property was evaluated, and the results indicate that the sample of Ag@PAN nanofiber mats possesses excellent antibacterial properties against Escherichia coli and Staphylococcus aureus .

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Section: Introductionmentioning

confidence: 64%

Highly Sensitive Surface-Enhanced Raman Spectroscopy Substrates of Ag@PAN Electrospinning Nanofibrous Membranes for Direct Detection of Bacteria

et al. 2020

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“…Innovative approaches such as conjugation of SERS with filter membranes make bacterial mapping feasible [247]. Core-shell assemblies have been used to obtain direct [248] as well as sandwich assays [249] for bacteria detection. Dual-enhancement using MNP shell -AuNP core with vancomycin SERS tags exhibited a 3.3-fold higher sensitivity [250] than functionalised polymeric MNPs [251].…”

Section: Reflectometric Interference Spectroscopy Biosensorsmentioning

confidence: 99%

Recent Progress in Optical Sensors for Biomedical Diagnostics

Pirzada

Altıntaş

2020

Micromachines

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In recent years, several types of optical sensors have been probed for their aptitude in healthcare biosensing, making their applications in biomedical diagnostics a rapidly evolving subject. Optical sensors show versatility amongst different receptor types and even permit the integration of different detection mechanisms. Such conjugated sensing platforms facilitate the exploitation of their neoteric synergistic characteristics for sensor fabrication. This paper covers nearly 250 research articles since 2016 representing the emerging interest in rapid, reproducible and ultrasensitive assays in clinical analysis. Therefore, we present an elaborate review of biomedical diagnostics with the help of optical sensors working on varied principles such as surface plasmon resonance, localised surface plasmon resonance, evanescent wave fluorescence, bioluminescence and several others. These sensors are capable of investigating toxins, proteins, pathogens, disease biomarkers and whole cells in varied sensing media ranging from water to buffer to more complex environments such as serum, blood or urine. Hence, the recent trends discussed in this review hold enormous potential for the widespread use of optical sensors in early-stage disease prediction and point-of-care testing devices.

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“…The possibility of producing different types of nanofiber wires, able of a magnetically induced giant relative deformation, is very promising in view of their functionalization in those conditions where the filiform structure can lead to advantages. In fact, on the basis of recent bibliography, MENWs development seems to open renewals and finalizations for biomedical applications [43][44][45][46], sensing devices [47][48][49][50], electromagnetic components [51,52], absorbers [53,54], tissue engineering [7,55,56] and, in particular, to biocompatible components sensitive to external stimuli in order to regenerate or to activate the contraction and dilatation of tendons and muscles that have lost their functionality [57][58][59][60][61].…”

Section: Aligning and Strain Effects Of Magnetization In Menwsmentioning

confidence: 99%

Elastomagnetic nanofiber wires by magnetic field assisted electrospinning

Guarino¹,

Iannotti²,

Ausanio³

et al. 2019

Express Polym. Lett.

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Magnetic field assisted electrospinning is supplemented by conductive sheets that envelop the magnets and have the same potential as the deposition electrode. By optimizing the experimental conditions, it is possible to produce wires made of polymer nanofibers that incorporate longitudinally oriented magnetic particles. The morphological and magnetic characterizations confirm the preferential orientations. The new nanofiber wires are easily aligned along the maximum intensity line of the applied magnetic field. Moreover, the nanostructured wires have high longitudinal elastomagnetic strain and high transversal deflection as a response to magnetic field stimuli. Therefore, these new threadlike aggregates of magnetic nanofibers could be very appealing for application in all microelectronic or biomedical devices whose functionality requires orientation or deformation.

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Fabrication of Ag@TiO2 electrospinning nanofibrous felts as SERS substrate for direct and sensitive bacterial detection

Cited by 73 publications

References 49 publications

Highly Sensitive Surface-Enhanced Raman Spectroscopy Substrates of Ag@PAN Electrospinning Nanofibrous Membranes for Direct Detection of Bacteria

Highly Sensitive Surface-Enhanced Raman Spectroscopy Substrates of Ag@PAN Electrospinning Nanofibrous Membranes for Direct Detection of Bacteria

Recent Progress in Optical Sensors for Biomedical Diagnostics

Elastomagnetic nanofiber wires by magnetic field assisted electrospinning

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