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Surface plasmon resonance

Jing-Min Liu, Yao-Yao Liu, Dong-Dong Zhang, Guozhen Fang, Shuo Wang
The rise of multimodal nanoprobes has promoted the development of new methods to explore multiple molecular targets simultaneously, or to combine various bioimaging tools in one assay to more clearly delineate localization and expression of bio-markers. Persistent luminescence nanophosphors (PLNPs) have been qualified as the promising contrast agent for in vivo imaging. The easy surface modification and proper nanostructure design strategy would favor the fabrication of PLNPs based multi-functional nanoprobes for biological application...
October 19, 2016: ACS Applied Materials & Interfaces
Marco Sturaro, Enrico Della Gaspera, Niccolò Michieli, Carlo Cantalini, Seyed Mahmoud Emamjomeh, Massimo Guglielmi, Alessandro Martucci
Highly doped wide band gap metal oxides nanocrystals have recently been proposed as building blocks for applications as transparent electrodes, electrochromics, plasmonics, and optoelectronics in general. Here we demonstrate the application of gallium doped zinc oxide (GZO) nanocrystals as novel plasmonic and chemiresistive sensors for the detection of hazardous gases including hydrogen (H2) and nitrogen dioxide (NO2). GZO nanocrystals with a tunable surface plasmon resonance in the near infrared are obtained using a colloidal heat-up synthesis...
October 18, 2016: ACS Applied Materials & Interfaces
Yu-Hong Cheng, Yue Zhang, Siu-Leung Chau, Samuel Kin-Man Lai, Ho-Wai Tang, Kwan-Ming Ng
Metal alloy nanoparticles (NPs) offer a new combination of unique physicochemical properties based on their pure counterparts, which can facilitate the development of novel analytical methods. Here, we demonstrated that Ag-Au alloy NPs could be utilized for optical and mass spectrometric imaging of latent fingerprints (LFPs) with improved image contrast, stability, and detection sensitivity. Upon deposition of Ag-Au alloy NPs (Ag:Au = 60:40% wt), ridge regions of the LFP became amber-coloured, while the groove regions appeared purple-blue...
October 17, 2016: ACS Applied Materials & Interfaces
Olga Borovkova, Andrey Kalish, Vladimir Belotelov
We propose a novel method to enhance the transverse magneto-optical Kerr effect (TMOKE) in the magneto-plasmonic (MP) nanostructures by means of the active dielectric layer. We report the theoretical analysis of the MP structure with a ferromagnetic dielectric doped with rear-earth ions (Nd<sup>3+</sup>) as the example of a gain layer. The enhancement takes place near the surface plasmon polariton (SPP) resonances of the nanostructures. The stimulated emission of the dopants in the field of the SPP wave partially compensates its losses...
October 1, 2016: Optics Letters
Yi Chen, Yue Ban, Qi-Biao Zhu, Xi Chen
Graphene-assisted resonant transmission and enhanced Goos-Hänchen shift are investigated in a two-prism frustrated total internal reflection configuration. Due to the excitation of surface plasmons induced by graphene in a low terahertz frequency range, there exist the resonant transmission and anomalous Goos-Hänchen shifts in such an optical tunneling configuration. As compared to the case of the quantum well, a graphene sheet with unique optical properties can enhance the resonant transmission with a relatively low loss and modulate the large negative and positive Goos-Hänchen shifts by adjusting the chemical potential or electron relaxation time...
October 1, 2016: Optics Letters
Mackenzie L Lauro, Elizabeth A D'Ambrosio, Brian J Bahnson, Catherine Leimkuhler Grimes
Genetic mutations in the innate immune receptor nucleotide-binding oligomerization domain-containing 2 (Nod2) have demonstrated increased susceptibility to Crohn's disease, an inflammatory bowel disease which is hypothesized to be accompanied by changes in the gut microbiota. Nod2 responds to the presence of bacteria, specifically a fragment of the bacterial cell wall, muramyl dipeptide (MDP). The proposed site of this interaction is the leucine-rich repeat (LRR) domain. Surface plasmon resonance and molecular modeling were used to investigate the interaction of the LRR domain with MDP...
October 17, 2016: ACS Infectious Diseases
M H Jazayeri, H Amani, A A Pourfatollah, A Avan, G A Ferns, H Pazoki-Toroudi
Prostate-specific antigen (PSA) is used to screen for prostate disease, although it has several limitations in its application as an organ-specific or cancer-specific marker. Furthermore, a highly specific/sensitive and/or label-free identification of PSA still remains a challenge in the diagnosis of prostate anomalies. We aimed to develop a gold nanoparticle (GNP)-conjugated anti-PSA antibody-based localized surface plasmon resonance (LSPR) as a novel approach to detect prostatic disease. A total of 25 nm colloidal gold particles were prepared followed by conjugation with anti-PSA pAb (GNPs-PSA pAb)...
October 14, 2016: Cancer Gene Therapy
Wei Xu, Jianquan Yao, Xianchao Yang, Jia Shi, Junfa Zhao, Cheng Zhang
A hollow fiber temperature sensor filled with graphene-Ag composite nanowire and liquid is presented and numerically characterized. The coupling properties and sensing performances are analyzed by finite element method (FEM) using both wavelength and amplitude interrogations. Due to the asymmetrical surface plasmon resonance sensing (SPR) region, the designed sensor exhibits strong birefringence, supporting two separate resonance peaks in orthogonal polarizations. Results show that x-polarized resonance peak can provide much better signal to noise ratio (SNR), wavelength and amplitude sensitivities than y-polarized, which is more suitable for tempertature detecting...
October 8, 2016: Sensors
Ivano Alessandri, John R Lombardi
Dielectrics represent a new frontier for surface-enhanced Raman scattering. They can serve as either a complement or an alternative to conventional, metal-based SERS, offering key advantages in terms of low invasiveness, reproducibility, versatility, and recyclability. In comparison to metals, dielectric systems and, in particular, semiconductors are characterized by a much greater variety of parameters and properties that can be tailored to achieve enhanced Raman scattering or related effects. Light-trapping and subwavelength-focusing capabilities, morphology-dependent resonances, control of band gap and stoichiometry, size-dependent plasmons and excitons, and charge transfer from semiconductors to molecules and vice versa are a few examples of the manifold opportunities associated with the use of semiconductors as SERS-active materials...
October 14, 2016: Chemical Reviews
I-Tan Lin, Jia-Ming Liu, Hsin-Cheng Tsai, Kaung-Hsiung Wu, Jheng-Yuan Syu, Ching-Yuan Su
The majority of the proposed graphene-based THz devices consist of a metamaterial that can optically interact with graphene. This coupled graphene-metamaterial system gives rise to a family of resonant modes such as the surface plasmon polariton (SPP) modes of graphene, the geometrically induced SPPs, also known as the spoof SPP modes, and the Fabry-Perot (FP) modes. In the literature, these modes are usually considered separately as if each could only exist in one structure. By contrast, in this paper, we show that even in a simple metamaterial structure such as a one-dimensional (1D) metallic slit grating, these modes all exist and can potentially interact with each other...
October 14, 2016: Scientific Reports
Hari Shankar Mahato
We investigate the transmission properties of a metallic layer with narrow slits. We consider (time-harmonic) Maxwell's equations in the H-parallel case with a fixed incident wavelength. We denote η > 0 as the typical size of the complex structure and obtain the effective equations by letting η → 0. For metallic permittivities with negative real part, plasmonic waves can be excited on the surfaces of the slits. For the waves to be in resonance with the height of the metallic layer, the corresponding results can be perfect transmission through the layer...
2016: TheScientificWorldJournal
Katrin Niegelhell, Michael Suessenbacher, Katrin Jammernegg, Thomas Ganner, Daniel Schwendenwein, Helmut Schwab, Franz Stelzer, Harald Plank, Stefan Spirk
The creation of nano- and micropatterned polymer films is a crucial step for innumerous applications in science and technology. However, there are several problems associated with environmental aspects concerning the polymer synthesis itself, crosslinkers to induce the patterns as well as toxic solvents used for the preparation and even more important development of the films (e.g. chlorobenzene). In this paper, we present a facile method to produce micro- and nanopatterned biopolymer thin films using enzymes as so called biodevelopers...
October 13, 2016: Biomacromolecules
Kan Zhan, Rui Su, Sihang Bai, Zhenhua Yu, Nian Cheng, Changlei Wang, Sheng Xu, Wei Liu, Shishang Guo, Xing-Zhong Zhao
The properties of nanomaterials are highly dependent on their size, shape and composition. Compared with zero-dimensional nanoparticles, the increased dimension of a one-dimensional silver nanowire (AgNW/Ag NW) leads to extra challenges on synthesizing it with controllable sizes. Here, a convenient way for the synthesis of AgNWs with tunable sizes has been developed simply by adjusting the amount of salt additives, i.e., ferric chloride (FeCl3), or Fe(NO3)3 & KCl. The average diameter and length of nanowires are readily tailored within 45-220 nm and 10-230 μm, respectively...
October 13, 2016: Nanoscale
Caixia Niu, Quanwei Song, Gen He, Na Na, Jin Ouyang
Optical antennas with anisotropic metal nanostructures are widely used in the field of fluorescence enhancement based on localized surface plasmons (LSPs). They overcome the intrinsic defects of low brightness of near-infrared (NIR) dyes and can be used to develop sensitive NIR sensors for bioapplications. Here, we demonstrate a novel NIR plasmon-enhanced fluorescence (PEF) system consisting of elongated gold nanobipyramids (Au NBPs) antennas, silica, and NIR dyes. Silica was chosen as the rigid spacer to regulate the distance between the metal nanostructures and dyes...
October 13, 2016: Analytical Chemistry
Eriko Aoyama, Masaharu Takigawa
The surface plasmon resonance (SPR) biosensor is a useful tool to analyze numerically the interaction of certain molecules. The most important advantage of the SPR assay as compared with other protein-protein binding assays is that it can calculate the affinity between protein and its binding partner, for this affinity is necessary to determine the priority of interactions between proteins. Although CCN proteins have been shown to have various binding partners, the affinities of many of them have not yet been determined...
2017: Methods in Molecular Biology
Christoph Tondera, Markus Laube, Jens Pietzsch
The EF-hand type calcium-binding protein S100A12 exerts numerous intra- and extracellular functions of (patho)physiological relevance. Therefore, receptors of S100A12 are of high interest for research and clinical applications. Beside the extensively studied receptor for advanced glycation endproducts (RAGE), G-protein coupled receptors and more recently, scavenger receptors are suggested to be putative S100A12 receptors. Own findings and further information from the literature predestined CD36, a class B scavenger receptor, as promising candidate...
October 12, 2016: Amino Acids
Emma Danelius, Mariell Pettersson, Matilda Bred, Jaeki Min, M Brett Waddell, R Kiplin Guy, Morten Grøtli, Mate Erdelyi
Protein-protein interactions that have large, flat and featureless binding sites are difficult drug targets. In the development of their modulators conventional drug discovery strategies are often unsuccessful. Gaining a detailed understanding of the binding mode of protein-protein interaction inhibitors is therefore of vast importance for their future pharmaceutical use. The MDM2/p53 protein pair is a highly promising target for cancer treatment. Disruption of the protein complex using p53 α-helix mimetics has been shown to be a successful strategy to control p53 activity...
October 12, 2016: Organic & Biomolecular Chemistry
Laurent Limozin, Pierre Bongrand, Philippe Robert
Antibodies and B cell receptors often bind their antigen at cell-cell interface while both molecular species are surface-bound, which impacts bond kinetics and function. Despite the description of complex energy landscapes for dissociation kinetics which may also result in significantly different association kinetics, surface-bound molecule (2D) association kinetics usually remain described by an on-rate due to crossing of a single free energy barrier, and few experimental works have measured association kinetics under conditions implying force and two-dimensional relative ligand-receptor motion...
October 12, 2016: Scientific Reports
Lingling Fang, Yueliang Wang, Miao Liu, Ming Gong, An Xu, Zhaoxiang Deng
Achieving highly tunable and localized surface plasmon resonance up to near infrared (NIR) regions is a key target in nanoplasmonics. In particular, a self-assembly process capable of producing highly uniform and solution-processable nanomaterials with tailor-made plasmonic properties is lacking. We herein address this problem through a conjunctive use of wet Ag(+) soldering and dry thermal sintering to produce nanodimer-derived structures with precisely engineered charge-transfer plasmon (CTP). The sintered dimers are water soluble, featuring gradually shifted CTP spanning an 800 nm wavelength range (up to NIR II)...
October 12, 2016: Angewandte Chemie
Manish Kumar, Teena Jangid, Vandana Panchal, Praveen Kumar, Abhishek Pathak
Apart from the spherical shape, control over other shapes is a technical challenge in synthesis approaches of nanostructures. Here, we studied the effect of grazing angle cross-irradiation Ag thin films for the nanostructures evolution from a top-down approach. Ag thin films of different thicknesses were deposited on Si (100) and glass substrates by electron beam evaporation system and subsequently irradiated at grazing angle ions by 80 keV Ar(+) in two steps (to induce effectively a cross-ion irradiation)...
December 2016: Nanoscale Research Letters
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