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Surface plasmons

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https://www.readbyqxmd.com/read/28549217/surface-enhanced-raman-scattering-active-gold-nanoparticles-with-enzyme-mimicking-activities-for-measuring-glucose-and-lactate-in-living-tissues
#1
Yihui Hu, Hanjun Cheng, Xiaozhi Zhao, Jiangjiexing Wu, Faheem Muhammad, Shichao Lin, Jian He, Liqi Zhou, Chengping Zhang, Yu Deng, Peng Wang, Zhengyang Zhou, Shuming Nie, Hui Wei
Gold nanoparticles (AuNPs) with simultaneous plasmonic and biocatalytic properties provide a promising approach to developing versatile bioassays. However, the combination of AuNPs' intrinsic enzyme mimicking properties with their surface-enhanced Ra-man scattering (SERS) activities has yet to be explored. Here we designed a peroxidase mimicking nanozyme by in situ growing AuNPs into a highly porous and thermally stable metal-organic framework (MOF) called MIL-101. The obtained AuNPs@MIL-101 nanozymes acted as the peroxidase mimics to oxidize Raman inactive reporter leucomalachite green (LMG) into the active malachite green (MG) with hydrogen peroxide, and simultaneously as the SERS substrates to enhance the Raman signals of the as-produced MG...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28548835/rapid-deposition-of-uniform-polydopamine-coatings-on-nanoparticle-surfaces-with-controllable-thickness
#2
Nazar Orishchin, Cameron C Crane, Matthew Brownell, Tengjiao Wang, Samuel Jenkins, Min Zou, Arun Nair, Jingyi Chen
Polydopamine is a bioinspired, versatile material that can adhere to bulk and nanoscale surfaces made of disparate materials to improve their physical and chemical properties in many applications. The typical methods to coat polydopamine on the nanoparticle substrates usually take several hours to a day. This work successfully applies a dispersion method to form a controllable, uniform coating on a nanoparticle surface within minutes. Using plasmonic Ag nanoparticles as a substrate, the coating thickness can be monitored using a spectroscopic method based on the extinction peak shifts of the Ag nanoparticles...
May 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28548156/a-field-deployed-surface-plasmon-resonance-spr-sensor-for-rdx-quantification-in-environmental-waters
#3
Thibault Brulé, Geneviève Granger, Natalia Bukar, Clarisse Deschênes-Rancourt, Thierry Havard, Andreea R Schmitzer, Richard Martel, Jean-Francois Masson
A field-deployable surface plasmon resonance (SPR) sensor is reported for the detection of the energetic material (commonly termed explosives) 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) at ppb concentration in environmental samples. The SPR sensor was first validated under laboratory conditions with uncontaminated natural water samples spiked with known concentrations of RDX near the EPA limit of 2 ppb, which was then applied to monitor environmental samples collected in different downgradient wells near a grenade training range...
May 26, 2017: Analyst
https://www.readbyqxmd.com/read/28547877/comparative-study-of-osteogenic-activity-of-multilayers-made-of-synthetic-and-biogenic-polyelectrolytes
#4
Deepak Guduru, Marcus S Niepel, Cristina Gonzalez-Garcia, Manuel Salmeron-Sanchez, Thomas Groth
Polyelectrolyte multilayer (PEM) coatings on biomaterials are applied to tailor adhesion, growth, and function of cells on biomedical implants. Here, biogenic and synthetic polyelectrolytes (PEL) are used for layer-by-layer assembly to study the osteogenic activity of PEM with human osteosarcoma MG-63 cells in a comparative manner. Formation of PEM is achieved with biogenic PEL fibrinogen (FBG) and poly-l-lysine (PLL) as well as biotinylated chondroitin sulfate (BCS) and avidin (AVI), while poly(allylamine hydrochloride) (PAH) and polystyrene sulfonate (PSS) represent a fully synthetic PEM used as a reference system here...
May 26, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28546892/nanoantenna-assisted-plasmonic-enhancement-of-ir-absorption-of-vibrational-modes-of-organic-molecules
#5
Alexander G Milekhin, Olga Cherkasova, Sergei A Kuznetsov, Ilya A Milekhin, Ekatherina E Rodyakina, Alexander V Latyshev, Sreetama Banerjee, Georgeta Salvan, Dietrich R T Zahn
Nanoantenna-assisted plasmonic enhancement of IR absorption and Raman scattering was employed for studying the vibrational modes in organic molecules. Ultrathin cobalt phthalocyanine films (3 nm) were deposited on Au nanoantenna arrays with specified structural parameters. The deposited organic films reveal the enhancement of both Raman scattering and IR absorption vibrational modes. To extend the possibility of implementing surface-enhanced infrared absorption (SEIRA) for biological applications, the detection and analysis of the steroid hormone cortisol was demonstrated...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546890/near-field-surface-plasmon-field-enhancement-induced-by-rippled-surfaces
#6
Mario D'Acunto, Francesco Fuso, Ruggero Micheletto, Makoto Naruse, Francesco Tantussi, Maria Allegrini
The occurrence of plasmon resonances on metallic nanometer-scale structures is an intrinsically nanoscale phenomenon, given that the two resonance conditions (i.e., negative dielectric permittivity and large free-space wavelength in comparison with system dimensions) are realized at the same time on the nanoscale. Resonances on surface metallic nanostructures are often experimentally found by probing the structures under investigation with radiation of various frequencies following a trial-and-error method...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546317/anti-coalescence-of-bosons-on-a-lossy-beam-splitter
#7
B Vest, M-C Dheur, E Devaux, A Baron, E Rousseau, J-P Hugonin, J-J Greffet, G Messin, F Marquier
Two-boson interference, a fundamentally-quantum effect, has been extensively studied with photons through the Hong-Ou-Mandel effect and observed with guided plasmons. Using two freely-propagating surface plasmon polaritons (SPPs) interfering on a lossy beam splitter, we show that the presence of loss enables us to modify the reflection and transmission factors of the beam splitter, thus revealing quantum interference paths that do not exist in a lossless configuration. We investigate the two-plasmon interference on beam splitters with different sets of reflection and transmission factors...
May 25, 2017: Science
https://www.readbyqxmd.com/read/28545974/development-of-5-hydroxypyrazole-derivatives-as-reversible-inhibitors-of-lysine-specific-demethylase-1
#8
Daniel P Mould, Ulf Bremberg, Allan M Jordan, Matthis Geitmann, Alba Maiques-Diaz, Alison E McGonagle, Helen F Small, Tim C P Somervaille, Donald Ogilvie
A series of reversible inhibitors of lysine specific demethylase 1 (LSD1) with a 5-hydroxypyrazole scaffold have been developed from compound 7, which was identified from the patent literature. Surface plasmon resonance (SPR) and biochemical analysis showed it to be a reversible LSD1 inhibitor with an IC50 value of 0.23µM. Optimisation of this compound by rational design afforded compounds with Kd values of <10nM. In human THP-1 cells, these compounds were found to upregulate the expression of the surrogate cellular biomarker CD86...
May 8, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28545866/isolation-of-single-cells-for-protein-therapeutics-using-microwell-selection-and-surface-plasmon-resonance-imaging
#9
F Abali, M Stevens, A Tibbe, L W M M Terstappen, P N van de Velden, R B M Schasfoort
Here the feasibility is demonstrated that by combining Surface Plasmon Resonance Imaging (SPRi) and self-sorting microwell technology product secretion of individual cells can be monitored. Additionally isolation of the selected cells can be performed by punching the cells from the microwells using coordinates of the positions of microwells obtained with SPRi. Cells of interest can be retrieved sterile from the microwell array for further cultivation.
May 22, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28545716/connective-tissue-growth-factor-regulates-fibrosis-associated-renal-lymphangiogenesis
#10
Hiroshi Kinashi, Lucas L Falke, Tri Q Nguyen, Niels Bovenschen, Jan Aten, Andrew Leask, Yasuhiko Ito, Roel Goldschmeding
Lymphangiogenesis is correlated with the degree of renal interstitial fibrosis. Pro-fibrotic transforming growth factor β induces VEGF-C production, the main driver of lymphangiogenesis. Connective tissue growth factor (CTGF) is an important determinant of fibrotic tissue remodeling, but its possible involvement in lymphangiogenesis has not been explored. We found prominent lymphangiogenesis during tubulointerstitial fibrosis to be associated with increased expression of CTGF and VEGF-C in human obstructed nephropathy as well as in diabetic kidney disease...
May 23, 2017: Kidney International
https://www.readbyqxmd.com/read/28544921/in-situ-formed-copper-nanoparticles-templated-by-tdt-mediated-dna-for-enhanced-spr-sensor-based-dna-assay
#11
Pei-Xin Yuan, Sheng-Yuan Deng, Chen-Yu Zheng, Serge Cosnier, Dan Shan
For the efficient surface plasmon resonance (SPR)-based DNA assay researching, signal amplification tactics were absolutely necessary. In this work, a sensitive SPR-DNA sensor was developed by employing in situ synthesis of copper nanoparticles (CuNPs) templated by poly-T sequences DNA from terminal deoxynucleotidyl transferase (TdT)-mediated extension, and synergistically with nano-effect deposition as the mass relay. The objective of this strategy was manifold: firstly, tDNA hybridized with the optimal designed probes to active the TdT-mediated DNA extension onto the surface of SPR chip, resulted a long poly-T sequences ssDNA chain in dsDNA terminal onto surface of gold chip and characterized by SPR signal amplitudes...
May 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28544304/strong-improvement-of-long-term-chemical-and-thermal-stability-of-plasmonic-silver-nanoantennas-and-films
#12
Xiaolong Wang, Christian Santschi, Olivier J F Martin
Silver (Ag) nanostructures and thin films are advantageous plasmonic materials as they have significantly lower losses than gold (Au). Unfortunately, Ag nanostructures suffer from poor chemical and thermal stability, which limit their applications. Here, the mechanisms leading to the deterioration of Ag nanostructures are clarified. It is first shown that oxygen alone cannot oxidize Ag nanostructures. Then, experiments using X-ray photoelectron spectroscopy reveal that the amount of sulfur in ambient air is too low for efficient tarnishing of the Ag surface...
May 24, 2017: Small
https://www.readbyqxmd.com/read/28544200/sers-and-electrochemically-active-3d-plasmonic-liquid-marble-for-molecular-level-spectroelectrochemical-investigation-of-microliter-reaction
#13
Charlynn Koh, Hiang Kwee Lee, Gia Chuong Phan-Quang, Xuemei Han, Mian Rong Lee, Zhe Yang, Xing Yi Ling
Liquid marbles are emerging microreactors due to their isolated environment and flexibility of materials used. Herein, we demonstrate plasmonic liquid marble (PLM) as the smallest spectroelectrochemical microliter-scale reactor for concurrent spectro- and electrochemical analyses. We exploit PLM's three-dimensional Ag shell as bifunctional surface-enhanced Raman scattering (SERS) platform and working electrode for redox process modulation. The combination of SERS and electrochemistry (EC) capability enable in situ molecular read-out of transient electrochemical species, and elucidation of potential-dependent and multi-step reaction dynamics...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28541828/simple-green-production-of-silver-nanoparticles-facilitated-by-bacterial-genomic-dna-and-their-antibacterial-activity
#14
Jiraporn Chumpol, Sineenat Siri
Green synthesis of AgNPs has gained many research interests as a low cost and eco-friendly approach. This work reported on the use of bacterial genomic DNA as the alternative biopolymer for a green production of AgNPs under a neutral pH. Although both ssDNA and dsDNA could function as stabilizing agents during the synthesis process, the ssDNA, generated by pre-heating the dsDNA at 100 °C, was more efficient to produce AgNPs with higher yield as determined by the intensity of the surface plasmon resonance (SPR) peak of silver at 475 nm...
May 25, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28541708/highly-stable-monocrystalline-silver-clusters-for-plasmonic-applications
#15
Sergey M Novikov, Vladimir N Popok, Andrey B Evlyukhin, Muhammad Hanif, Per Morgen, Jacek Fiutowski, Jonas Beermann, Horst-Guenter Rubahn, Sergey I Bozhevolnyi
: Plasmonics sensor configurations utilizing localized plasmon resonances in silver nanostructures typically suffer from rapid degradation of silver in ambient atmospheric conditions. In this work, we report on the fabrication and detailed characterization of ensembles of monocrystalline silver nanoparticles (NPs), which exhibit a long-term stability of optical properties under ambient conditions without any protective treatments. Ensembles with different densities (surface coverages) of size-selected NPs (diameters from 12...
May 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28541355/strong-chiroptical-activity-from-achiral-gold-nanorods-assembled-with-proteins
#16
Hideyuki Shinmori, Chihiro Mochizuki
The side-by-side assembly of gold nanorods and proteins, particularly human serum albumin, exhibits a distinct chiroptical activity in a wide range of visible and near-infrared wavelengths corresponding to the surface plasmon resonance. The anisotropy factor was the highest in a colloidal solution system and was able to be inverted by an external environment.
May 25, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28541250/plasmonic-surface-nanostructuring-of-au-dots-sio2-via-laser-irradiation-induced-dewetting
#17
Ruixuan Yu, Tamaki Shibayama, Junya Ishioka, Xuan Meng, Yanhua Lei, Seiichi Watanabe
The in-situ observation of Au dot formation and the self-assembly dynamics of Au nanoparticles (NPs) was successfully demonstrated via dewetting of Au thin films on SiO<sub>2</sub> glass substrates under nano-second pulsed laser irradiation using a multi-quantum beam high-voltage electron microscope. Moreover, using electron energy-loss spectroscopy (EELS) performed in a scanning transmission electron microscope (STEM), the plasmonic properties of the formed Au/SiO<sub>2</sub> nanostructure were analyzed to demonstrate its validity in advanced optical devices...
May 25, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28539668/local-surface-plasmon-enhanced-polarization-and-internal-quantum-efficiency-of-deep-ultraviolet-emissions-from-algan-based-quantum-wells
#18
Cai Zhang, Ning Tang, Liangliang Shang, Lei Fu, Weiying Wang, Fujun Xu, Xinqiang Wang, Weikun Ge, Bo Shen
We report the enhancement of the polarization and internal quantum efficiency (IQE) of deep-UV LEDs by evaporating Al nanoparticles on the device surface to induce localized surface plasmons (LSPs). The deep-UV LEDs polarization is improved due to part of TM emission turns into TE emission through LSPs coupling. The significantly enhanced IQE is attributed to LSPs coupling, which suppress the participation of delocalized and dissociated excitons to non-radiative recombination process.
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28537066/optically-patternable-metamaterial-below-diffraction-limit
#19
Youngseop Lee, Sang-Gil Park, SeokJae Yoo, Minhee Kang, Sang Chul Jeon, Young-Su Kim, Q-Han Park, Ki-Hun Jeong
We report an optically patternable metamaterial (OPM) for ultraviolet nanolithography below the diffraction limit. The OPM features monolayered silver nanoislands embedded within a photosensitive polymer by using spin-coating of an ultrathin polymer, oblique angle deposition and solid-state embedment of silver nanoislands. This unique configuration simultaneously exhibits both negative effective permittivity and high image contrast in the ultraviolet range, which enables the surface plasmon excitation for the clear photolithographic definition of minimum feature size of 70 nm (< ~ λ/5) beyond the near-field zone...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537028/enhanced-larvicidal-antibacterial-and-photocatalytic-efficacy-of-tio2-nanohybrids-green-synthesized-using-the-aqueous-leaf-extract-of-parthenium-hysterophorus
#20
Keerthika Thandapani, Manikandan Kathiravan, Elangovan Namasivayam, Indira Arulselvi Padiksan, Geetha Natesan, Manish Tiwari, Benelli Giovanni, Venkatachalam Perumal
Titanium dioxide nanoparticles are emerging as a biocompatible nanomaterial with multipurpose bioactivities. In this study, titanium dioxide (TiO2) nanoparticles were effectively synthesized using the aqueous leaf extracts of Parthenium hysterophorus prepared by microwave irradiation. TiO2 nanoparticles were fabricated by treating the P. hysterophorus leaf extracts with the TiO4 solution. Biologically active compounds such as alcohols, phenols, alkanes, and fluoroalkanes were involved in bioreduction of TiO4 into TiO2...
May 23, 2017: Environmental Science and Pollution Research International
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