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https://www.readbyqxmd.com/read/28933819/superior-plasmonic-photodetectors-based-on-au-mos2-core-shell-heterostructures
#1
Yuan Li, Jennifer G DiStefano, Akshay A Murthy, Jeffrey D Cain, Eve D Hanson, Qianqian Li, Fernando C Castro, Xinqi Chen, Vinayak P Dravid
Integrating plasmonic materials into semiconductor media provides a promising approach for applications such as photo-sensing and solar energy conversion. The resulting structures introduce enhanced light-matter interactions, additional charge trap states, and efficient charge-transfer pathways for light-harvesting devices, especially when an intimate interface is built between the plasmonic nanostructure and semiconductor. Herein, we report the development of plasmonic photodetectors using Au@MoS2 heterostructures - an Au nanoparticle core that is encapsulated by a CVD-grown multilayer MoS2 shell, which perfectly realizes the intimate and direct interfacing of Au and MoS2...
September 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28933642/epitope-characterization-of-anti-jam-a-antibodies-using-orthogonal-mass-spectrometry-and-surface-plasmon-resonance-approaches
#2
Guillaume Terral, Thierry Champion, François Debaene, Olivier Colas, Maxime Bourguet, Elsa Wagner-Rousset, Nathalie Corvaia, Alain Beck, Sarah Cianferani
Junctional adhesion molecule-A (JAM-A) is an adherens and tight junction protein expressed by endothelial and epithelial cells and associated with cancer progression. We present here the extensive characterization of immune complexes involving JAM-A antigen and three monoclonal antibodies (mAbs), including hz6F4-2, a humanized version of anti-tumoral 6F4 mAb identified by a functional and proteomic approach in our laboratory. A specific workflow that combines orthogonal approaches has been designed to determine binding stoichiometries along with JAM-A epitope mapping determination at high resolution for these three mAbs...
September 21, 2017: MAbs
https://www.readbyqxmd.com/read/28933556/the-assembly-behavior-of-organically-interlinked-gold-nanoparticle-composite-films-a-quartz-crystal-microbalance-investigation
#3
Yelyena Daskal, Tina Tauchnitz, Frederic Güth, Rosemarie Dittrich, Yvonne Joseph
Thin films based on dodecylamine stabilized gold nanoparticles interlinked with different organic molecules are prepared by automatic layer-by-layer self-assembly in a microfluidic quartz crystal microbalance (QCM) cell, to obtain an in-situ insight on the film formation by ligand/linker exchange reactions. The influence of interlinking functional groups and the length of the organic linker molecule on assembly behavior is investigated. Namely alkyldithiols with different lengths are compared to alkyldiamines and alkylbisdithiocarbamates with a C8 alkylic molecular backbone...
September 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28933537/membrane-fluidity-sensing-on-the-single-virus-particle-level-with-plasmonic-nanoparticle-transducers
#4
Amin Feizpour, David N Stelter, Crystal Wong, Hisashi Akiyama, Suryaram Gummuluru, Tom Keyes, Bjoern M Reinhard
Viral membranes are nanomaterials whose fluidity depends on their composition, in particular the cholesterol (chol) content. As differences in the membrane composition of individual virus particles can lead to different intracellular fates, biophysical tools capable of sensing the membrane fluidity on the single-virus level are required. In this manuscript, we demonstrate that fluctuations in the polarization of light scattered off gold or silver nanoparticle (NP)-labeled virus-like-particles (VLPs) encode information about the membrane fluidity of individual VLPs...
September 21, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28933500/significant-improvement-of-near-uv-electroluminescence-from-zno-quantum-dot-leds-via-coupling-with-carbon-nanodot-surface-plasmons
#5
Cen Zhang, Feifei Zhu, Haiyang Xu, Weizhen Liu, Liu Yang, Zhongqiang Wang, Jiangang Ma, Zhenhui Kang, Yichun Liu
Short-wavelength LEDs, a hot research topic in modern optoelectronics, have attracted tremendous attention in recent years because of their great application potential in both civil and military domains. Compared to conventional metallic surface-plasmons (SPs), carbon nanodot (CD) SPs with less optical loss and low cost, broader SP resonant frequency and good biocompatibility are expected to provide more prominent luminescence enhancement for light emitters. Herein, SP-enhanced near-UV emission quantum dot LEDs (Q-LED) were fabricated via introducing CDs into p-GaN/Al2O3/ZnO Q-LEDs by optimizing the molar ratio of ZnO quantum dots to CDs and a significant enhancement (∼20-fold) of the near-UV electroluminescence (EL) intensity from the ZnO-based Q-LEDs was achieved...
September 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28933479/linking-classical-and-molecular-optomechanics-descriptions-of-sers
#6
Mikołaj K Schmidt, Ruben Esteban, Felix Benz, Jeremy J Baumberg, Javier Aizpurua
The surface-enhanced Raman scattering (SERS) of molecular species in plasmonic cavities can be described as an optomechanical process where plasmons constitute an optical cavity of reduced effective mode volume which effectively couples to the vibrations of the molecules. An optomechanical Hamiltonian can address the full quantum dynamics of the system, including the phonon population build-up, the vibrational pumping regime, and the Stokes-anti-Stokes correlations of the photons emitted. Here we describe in detail two different levels of approximation to the methodological solution of the optomechanical Hamiltonian of a generic SERS configuration, and compare the results of each model in light of recent experiments...
September 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28933352/possible-instability-of-the-fermi-sea-against-surface-plasma-oscillations
#7
Hai-Yao Deng
We derive a generic formalism for studying the energy conversion processes in bounded metals. Using this formalism we show that in the collision-less limit the Fermi sea of metals should experience an instability against surface plasma oscillations, which opens for the latter an intrinsic self-amplification channel. The origin of the instability is clarified as arising from novel effects resulting from the translation symetry breaking due to the very presence of surface. The amplification rate of this channel is analytically evaluated on the basis of energy conservation and the effects of losses are discussed...
September 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28932840/monitoring-plasmon-coupling-and-sers-enhancement-through-in-situ-nanoparticle-spacing-modulation
#8
L Velleman, L Scarabelli, D Sikdar, A A Kornyshev, L M Liz-Marzán, J B Edel
Self-assembled nanoparticle (NP) arrays at liquid interfaces provide a unique optical response which has opened the door to new tuneable metamaterials for sensing and optical applications. NPs can spontaneously assemble at a liquid-liquid interface, forming an ordered, self-healing, low-defect 2D film. The close proximity of the NPs at the interface results in collective plasmonic modes with a spectral response dependent on the distance between the NPs and induces large field enhancements within the gaps. In this study, we assembled spherical and rod-shaped gold NPs with the aim of improving our understanding of NP assembly processes at liquid interfaces, working towards finely controlling their structure and producing tailored optical and enhanced Raman signals...
September 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28931911/terahertz-magneto-plasmonics-using-cobalt-subwavelength-aperture-arrays
#9
Barun Gupta, Shashank Pandey, Anjali Nahata, Berardi Sensale-Rodriguez, Sivaraman Guruswamy, Ajay Nahata
We characterize the terahertz (THz) magneto-plasmonic response of a cobalt-based periodic aperture array. The bare cobalt surface allows for low loss propagation of surface plasmon-polaritons, as evidenced by comparing the reflection from aperture arrays coated with Au and with Co. When an external magnetic field is applied in a polar Kerr geometry, we observe a maximum polarization rotation of ~0.6° and an ellipticity of ~0.35° from the Co-based array. These values are larger than expected based on existing models that include only interband transitions in ferromagnetic metals...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931903/plasmonic-enhancement-of-selective-photonic-virus-inactivation
#10
Mina Nazari, Min Xi, Sarah Lerch, M H Alizadeh, Chelsea Ettinger, Hisashi Akiyama, Christopher Gillespie, Suryaram Gummuluru, Shyamsunder Erramilli, Björn M Reinhard
Femtosecond (fs) pulsed laser irradiation techniques have attracted interest as a photonic approach for the selective inactivation of virus contaminations in biological samples. Conventional pulsed laser approaches require, however, relatively long irradiation times to achieve a significant inactivation of virus. In this study, we investigate the enhancement of the photonic inactivation of Murine Leukemia Virus (MLV) via 805 nm femtosecond pulses through gold nanorods whose localized surface plasmon resonance overlaps with the excitation laser...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931000/trapping-of-micro-particles-in-nanoplasmonic-optical-lattice
#11
Dinesh Bhalothia, Ya-Tang Yang
The plasmonic optical tweezer has been developed to overcome the diffraction limits of the conventional far field optical tweezer. Plasmonic optical lattice consists of an array of nanostructures, which exhibit a variety of trapping and transport behaviors. We report the experimental procedures to trap micro-particles in a simple square nanoplasmonic optical lattice. We also describe the optical setup and the nanofabrication of a nanoplasmonic array. The optical potential is created by illuminating an array of gold nanodiscs with a Gaussian beam of 980 nm wavelength, and exciting plasmon resonance...
September 5, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28930431/orientation-dependent-exciton-plasmon-coupling-in-embedded-organic-metal-nanowire-heterostructures
#12
Yong Jun Li, Yan Hong, Qian Peng, Jiannian Yao, Yong Sheng Zhao
The excitation of surface plasmons by optical emitters based on exciton-plasmon coupling is important for plasmonic devices with active optical properties. It has been theoretically demonstrated that the orientation of exciton dipole can significantly influence the coupling strength, yet systematic study of the coupling process in nanostructures is still hindered by the lack of proper material systems. In this work, we have experimentally investigated the orientation-dependent exciton-plasmon coupling in a rationally designed organic/metal nanowire heterostructure system...
September 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28930311/universal-analytical-modeling-of-plasmonic-nanoparticles
#13
Renwen Yu, Luis M Liz-Marzán, F Javier García de Abajo
Control over the optical response of metal nanoparticles and their associated plasmons is currently enabling many promising applications in areas as diverse as biosensing and photocatalysis. In this context, experiments based upon colloid synthesis and nanofabricated structures are assisted by numerical electromagnetic modeling, which supplies predictive simulations, but not the kind of physical intuition needed for exploration of new ideas, such as one finds when simple mathematical expressions can describe a problem...
September 20, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28930149/anti-inflammatory-effects-of-a-mytilus-coruscus-%C3%AE-d-glucan-mp-a-in-activated-macrophage-cells-via-tlr4-nf-%C3%AE%C2%BAb-mapk-pathway-inhibition
#14
Fuyan Liu, Xiaofeng Zhang, Yuqiu Li, Qixin Chen, Fei Liu, Xiqiang Zhu, Li Mei, Xinlei Song, Xia Liu, Zhigang Song, Jinhua Zhang, Wen Zhang, Peixue Ling, Fengshan Wang
The hard-shelled mussel (Mytilus coruscus) has been used as Chinese traditional medicine for thousands of years; however, to date the ingredients responsible for the various beneficial health outcomes attributed to Mytilus coruscus are still unclear. An α-d-Glucan, called MP-A, was isolated from Mytilus coruscus, and observed to exert anti-inflammatory activity in THP-1 human macrophage cells. Specifically, we showed that MP-A treatment inhibited the production of inflammatory markers, including TNF-α, NO, and PGE2, inducible NOS (iNOS), and cyclooxygenase-2 (COX-2), in LPS-activated THP-1 cells...
September 20, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28929738/plasmonic-effects-of-metallic-nanoparticles-on-enhancing-performance-of-perovskite-solar-cells
#15
Qi Luo, Chenxi Zhang, Xueshuang Deng, Hongbing Zhu, Zhiqiang Li, Zengbo Wang, Xiaohong Chen, Sumei Huang
We report the systematic design and formation of plasmonic perovskite solar cells (PSCs) by integrating Au@TiO2 core-shell nanoparticles (NPs) into porous TiO2 and/or perovskite semiconductor capping layers. The plasmonic effects in the formed PSCs are examined. The most efficient configuration is obtained by incorporating Au@TiO2 NPs into both the porous TiO2 and the perovskite capping layers, which increases the power conversion efficiency (PCE) from 12.59 % to 18.24 %, demonstrating over 44% enhancement, compared with the reference device without the metal NPs...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929152/size-dependent-targeted-delivery-of-gold-nanoparticles-modified-with-the-il-6r-specific-aptamer-air-3a-to-il-6r-carrying-cells
#16
Lisa Prisner, Nadine Bohn, Ulrich Hahn, Alf Mews
The delivery of gold nanoparticles (AuNPs) to specific cells strongly depends on the properties e.g. the size of the particles and is of great interest for a large variety of biomedical applications. Here we investigated the size dependence of the receptor-ligand mediated AuNP delivery to cells by comparing very small "molecular" Au-clusters of only 2 nm to larger 7 nm and 36 nm AuNPs with a distinct surface plasmon resonance. Since the molecular weight in this range changes by almost three orders of magnitude, we show how the amount of gold relates to the number of delivered AuNPs...
September 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28928748/a-peptide-fc-opsonin-with-pan-amyloid-reactivity
#17
James S Foster, Angela D Williams, Sallie Macy, Tina Richey, Alan Stuckey, Daniel Craig Wooliver, Richa Koul-Tiwari, Emily B Martin, Stephen J Kennel, Jonathan S Wall
There is a continuing need for therapeutic interventions for patients with the protein misfolding disorders that result in systemic amyloidosis. Recently, specific antibodies have been employed to treat AL amyloidosis by opsonizing tissue amyloid deposits thereby inducing cell-mediated dissolution and organ improvement. To develop a pan-amyloid therapeutic agent, we have produced an Fc-fusion product incorporating a peptide, p5, which binds many if not all forms of amyloid. This protein, designated Fcp5, expressed in mammalian cells, forms the desired bivalent dimer structure and retains pan-amyloid reactivity similar to the p5 peptide as measured by immunosorbent assays, immunohistochemistry, surface plasmon resonance, and pulldown assays using radioiodinated Fcp5...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28928083/preparation-and-characterization-of-a-high-affinity-monoclonal-antibody-against-human-epididymis-protein-4
#18
Yunlong Shen, Yuxi Wang, Xiaohua Jiang, Liang Lu, Chengdi Wang, Wenxin Luo, Yongxia Zhang, Pei Li, Zhengwei Du, Tengfei Dai, Congcong Wu, Aiping Fang, Yuqin Yao, Qian Peng, Jinliang Yang
Human epididymis protein-4 (HE4) may serve as a putative biomarker for the early diagnosis, therapy and especially prognosis of ovarian, lung and breast cancer. Detection and targeting of HE4 using the anti-HE4 antibody could be one of the effective strategies for the cancer diagnosis and treatment in clinical practice. In this study, a high-efficiency expression system was established to purify recombinant HE4. We obtained high purity HE4 in 400 mg quantity from 1 L culture supernatant of HEK293F cells. CCK-8 and cell cycle assays indicated that the purified recombinant HE4 protein could promote SKOV3 cell cycle and proliferation at the concentration of 0...
September 16, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28927616/functionalization-of-cotton-fabrics-with-plasmonic-photo-active-nanostructured-au-tio2-layer
#19
M Abid, S Bouattour, A M Ferraria, D S Conceição, A P Carapeto, L F Vieira Ferreira, A M Botelho do Rego, M Rei Vilar, S Boufi
A simple approach to functionalize cotton fabrics with Au and TiO2 nanostructured layer is presented. Hybrid fabrics (Cot-Au-TiO2) are prepared through reduction of AuCl4(-) on cotton, followed by a non-aqueous sol-gel procedure using tetrabutyltitanate and a hydrothermal treatment at 110°C. The generation of crystalline TiO2 is confirmed by Raman spectroscopy. The fibres morphology and their roughness are characterized by AFM and FE-SEM. XPS shows how the concentration of the NPs precursors (Au and TiO2) affects the layer composition...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28926954/evidence-for-complex-formation-of-the-bacillus-cereus-haemolysin-bl-components-in-solution
#20
Franziska Tausch, Richard Dietrich, Kristina Schauer, Robert Janowski, Dierk Niessing, Erwin Märtlbauer, Nadja Jessberger
Haemolysin BL is an important virulence factor regarding the diarrheal type of food poisoning caused by Bacillus cereus. However, the pathogenic importance of this three-component enterotoxin is difficult to access, as nearly all natural B. cereus culture supernatants additionally contain the highly cytotoxic Nhe, the second three-component toxin involved in the aetiology of B. cereus-induced food-borne diseases. To better address the toxic properties of the Hbl complex, a system for overexpression and purification of functional, cytotoxic, recombinant (r)Hbl components L₂, L₁ and B from E...
September 16, 2017: Toxins
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