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plasmon resonance nanoparticles

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https://read.qxmd.com/read/30771384/localized-surface-plasmon-resonance-biosensing-of-tomato-yellow-leaf-curl-virus
#1
Arash Razmi, Arezoo Golestanipour, Maryam Nikkhah, Abdolreza Bagheri, Masoud Shamsbakhsh, Saeed Malekzadeh-Shafaroudi
Current techniques for plant virus detection, such as RT- PCR and ELISA, require multistep procedures and rely on sophisticated equipment. Due to the global spread of plant viruses, the development of simpler, faster and cheaper assay methods is inevitable. Gold nanoparticles (AuNPs) had raised much interest during recent years due to their novel optical properties or diagnostic purposes. The localized surface plasmon resonance (LSPR1 ) of AuNPs had been used in the development of novel colorimetric nano-biosensing systems...
February 13, 2019: Journal of Virological Methods
https://read.qxmd.com/read/30769027/comparative-study-between-two-red-algae-for-biosynthesis-silver-nanoparticles-capping-by-sds-insights-of-characterization-and-antibacterial-activity
#2
Ragaa A Hamouda, Mahmoud Abd El-Mongy, Kamel F Eid
Biosynthesis silver nanoparticles (AgNPs) have received a lot of attention as a Cytotoxic and antimicrobial activity against pathogenic bacteria. This study was carried out to evaluate the potential ability of red marine algae Corallina elongata and Gelidium amansii to biosynthesis AgNPs capping with Sodium Dodecyl Sulfate (SDS) and to determine its antibacterial efficacy. Characterization of capping AgNPs were determined by Ultra violet-Visible spectroscopy, Transmission electron microscope (TEM), Scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR), Energy dispersive X-ray spectroscopy (EDX), Zeta potential and sizer...
February 12, 2019: Microbial Pathogenesis
https://read.qxmd.com/read/30768103/glowing-gold-nanoparticle-coating-restoring-the-lost-property-from-bulk-gold
#3
Yukari Kawabe, Takashi Ito, Hiroaki Yoshida, Hiroshi Moriwaki
The unique electronic, optical, and catalytic properties of AuNPs caused by localized surface plasmon resonance (LSPR) have attracted many scientists, but the LSPR diminishes the captivating luster of bulk gold. An exciting challenge is the fabrication of golden-colored AuNPs, but a decisive factor for controlling the absorption/reflection of AuNPs remains elusive. We now propose a simple and versatile method for the fabrication of glowing AuNPs to restore the "lost golden color" of AuNPs in combination with the deposition of AuNPs on a cellulose filter or a PET/cotton fabric by the successive ionic layer adsorption and reaction (SILAR) method and simple pencil drawing...
February 15, 2019: Nanoscale
https://read.qxmd.com/read/30766990/plasmonic-gold-nanoparticles-as-multifaceted-probe-for-tissue-imaging
#4
Yu-Hong Cheng, Toby Siu-Chung Tam, Siu-Leung Chau, Samuel Kin-Man Lai, Ho-Wai Tang, Chun-Nam Lok, Ching-Wan Lam, Kwan-Ming Ng
The localized surface plasmon resonance property of gold nanoparticles enables their application as a versatile and sensitive imaging probe, with intense colour, enhanced fluorescence and strong MS ion intensity for biological tissue imaging.
February 15, 2019: Chemical Communications: Chem Comm
https://read.qxmd.com/read/30766441/antibacterial-activity-of-biosynthesized-gold-nanoparticles-using-biomolecules-from-lignosus-rhinocerotis-and-chitosan
#5
Haliza Katas, Chei Sin Lim, Ahmad Yasser Hamdi Nor Azlan, Fhataheya Buang, Mohd Fauzi Mh Busra
A simple, cost-effective, and environmentally friendly method is needed for synthesizing metal nanoparticles, including gold nanoparticles (AuNPs). In this study, AuNPs were synthesized with Lignosus rhinocerotis sclerotial extract (LRE) and chitosan (CS) as reducing and stabilizing agents, respectively. Different LRE concentrations from cold and hot water extraction (CWE and HWE, respectively) were used to reduce chloroauric acid (HAuCl4 ) to form AuNPs. Positively charged chitosan stabilized AuNPs (CS-AuNPs) mediated by LRE exhibited a surface plasmon resonance (SPR) band at 533 nm...
February 2019: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://read.qxmd.com/read/30765813/new-mechanism-of-plasmons-specific-for-spin-polarized-nanoparticles
#6
Hari L Bhatta, Ali E Aliev, Vladimir P Drachev
Here it is experimentally shown that Co nanoparticles with a single-domain crystal structure support a plasmon resonance at approximately 280 nm with better quality than gold nanoparticle resonance in the visible. Magnetic nature of the nanoparticles suggests a new type of these plasmons. The exchange interaction of electrons splits the energy bands between spin-up electrons and spin-down electrons. It makes it possible for coexistence of two independent channels of conductivity as well as two independent plasmons in the same nanoparticle with very different electron relaxation...
February 14, 2019: Scientific Reports
https://read.qxmd.com/read/30764978/biosynthesis-characterization-and-biological-activities-of-silver-nanoparticles-from-pogostemon-cablin-benth-methanolic-leaf-extract
#7
Sun Qing, Qiu Shoutian, Gu Hongyan, Yao Ming, Mallappa Kumara Swamy, Uma Rani Sinniah, Ahmad Umar, Mohd Sayeed Akhtar
This study reports the biosynthesis of silver nanoparticles (AgNPs) using methanolic leaf extract of Pogostemon cablin Benth. (Patchouli) as a reducing agent, and their potent biological (antibacterial, antioxidant and anticancer) activities. The P. cablin extract when exposed to silver nitrate reduced silver ions to form crystalline AgNPs within 1 h of incubation at room-temperature. UV-visible spectra showed a sharp surface plasmon resonance (SPR) at around 430 nm for the biosynthesized AgNPs and the XRD pattern indicated the crystalline planes of the face centered cubic silver...
July 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30764971/synthesis-of-superparamagnetic-znfe%C3%A2-o%C3%A2-core-ag-deposited-zno-shell-nanodiscs-for-application-as-visible-light-photocatalyst
#8
C Karunakaran, I JebaSing, P Vinayagamoorthy
Nanodiscs with ZnFe₂O₄ core and Ag-deposited ZnO shell have been synthesized by hydrothermal method. Scanning electron microscopy (SEM) shows the morphology as nanodiscs. X-ray diffractometry (XRD), selected area electron diffractometry (SAED) and Raman spectroscopy reveal cubic ZnFe₂O₄, hexagonal ZnO and face centered cubic Ag as the constituents of the synthesized nanodiscs. Energy dispersive X-ray spectroscopy (EDS) provides the atomic percentage of Ag as 0.6. High resolution transmission electron microscopy (HRTEM) displays the core-shell structure of the synthesized nanodiscs...
July 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30754029/nanoplasmonic-response-of-porous-au-tio2-thin-films-prepared-by-oblique-angle-deposition
#9
Marco S Rodrigues, Joel Borges, Manuela Proença, Paulo Pedrosa, Nicolas Martin, Konstantin Romanyuk, Andrei L Kholkin, Filipe Vaz
In this work, a versatile method is proposed to increase the sensitivity of optical sensors based on the localized surface plasmon resonance (LSPR) phenomenon. It combines a physical deposition method with the Oblique Angle Deposition (OAD) technique, allowing the preparation of plasmonic thin films with tailored porosity. Thin films of Au-TiO<sub>2</sub> were deposited by reactive magnetron sputtering in a 3D nanostructure (zigzag growth), at different incidence angles (0º ≤ α ≤ 80º), followed by in-air thermal annealing at 400 ºC to induce the growth of the Au nanoparticles...
February 12, 2019: Nanotechnology
https://read.qxmd.com/read/30747516/a-nanoplasmonic-biosensor-for-ultrasensitive-detection-of-alzheimer-s-disease-biomarker-using-a-chaotropic-agent
#10
Hanbi Kim, Jong Uk Lee, Soohyun Kim, Sojin Song, Sang Jun Sim
Blood-based diagnosis (Hemodiagnosis) of Alzheimer's disease (AD) is emerging as a promising alternative of cerebrospinal fluid-based methods because blood contains various kinds of AD biomarkers, including amyloid beta 1-40, 1-42, and τ (tau) protein. However, with current technology, the accuracy of the blood plasma-based methods is relatively low compared to the traditional methods because the concentration of AD biomarkers in blood plasma is incredibly low and diverse interfer-ence is present in blood plasma, which hinders precise detection...
February 12, 2019: ACS Sensors
https://read.qxmd.com/read/30746929/multi-functional-silver-nanoparticles-interlayer-modified-zno-as-electron-injection-layer-for-efficient-inverted-organic-light-emitting-diodes
#11
Lei Zhou, Heng-Yang Xiang, Yufu Zhu, Qingdong Ou, Qiankun Wang, Juan Du, Rui Hu, Xian-Bo Huang, Jian-Xin Tang
The insufficient electron injection constitutes the major obstacle to achieving high performance inverted organic light-emitting diodes (OLEDs). Here, a facile electron-injection architecture featuring silver nanoparticles (AgNPs) interlayer modified sol-gel-derived transparent zinc oxide (ZnO) ultrathin film is proposed and demonstrated. The optimized external quantum efficiencies of the developed inverted fluorescent and phosphorescent OLEDs capitalized on our proposed electron-injection structure reached 4...
February 12, 2019: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30742413/surface-chemistry-mediated-near-infrared-emission-of-small-coinage-metal-nanoparticles
#12
Scott E Crawford, Michael J Hartmann, Jill E Millstone
From size-dependent luminescence to localized surface plasmon resonances, the optical properties that emerge from common materials with nanoscale dimensions have been revolutionary. As nanomaterials get smaller, they approach molecular electronic structures, and this transition from bulk to molecular electronic properties is a subject of far-reaching impact. One class of nanomaterials that exhibit particularly interesting optoelectronic features at this size transition are coinage metal (i.e., group 11 elements copper, silver, and gold) nanoparticles with core diameters between approximately 1 to 3 nm (∼25-200 atoms)...
February 11, 2019: Accounts of Chemical Research
https://read.qxmd.com/read/30738309/enhanced-photovoltaic-properties-of-dye-sensitized-solar-cells-using-three-component-cnf-tio-2-au-heterostructure
#13
Dongxiao Lu, Jinhua Li, Guohui Lu, Longgui Qin, Deye Liu, Peng Sun, Fengmin Liu, Geyu Lu
To further increase the photoelectric efficiency of dye-sensitized solar cell (DSSC), enhancing the light adsorption of photoanode and suppressing the recombination of photo-generated charges are of great importance. Motivated by this, a novel and efficient three-component CNF/TiO2 /Au heterostructure was successfully constructed and employed as an alternative photoanode material. The as-prepared CNF/TiO2 /Au is characterized by conductive carbon nanofiber (CNF) core, uniform TiO2 outer shell assembled by upright nanorods, and surface modification with well-dispersed Au nanoparticles...
February 2, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30736360/femtosecond-spectroscopy-of-au-hot-electron-injection-into-tio%C3%A2-evidence-for-au-tio%C3%A2-plasmon-photocatalysis-by-bactericidal-au-ions-and-related-phenomena
#14
Marina Radzig, Olga Koksharova, Inessa Khmel, Vladimir Ivanov, Khursand Yorov, John Kiwi, Sami Rtimi, Elina Tastekova, Arseny Aybush, Victor Nadtochenko
In the present work, we provide evidence for visible light irradiation of the Au/TiO₂ nanoparticles' surface plasmon resonance band (SPR) leading to electron injection from the Au nanoparticles to the conduction band of TiO₂. The Au/TiO₂ SPR band is shown to greatly enhance the light absorption of TiO₂ in the visible region. Evidence is presented for the light absorption by the Au/TiO₂ plasmon bands leading to the dissolution of Au nanoparticles. This dissolution occurs concomitantly with the injection of the hot electrons generated by the Au plasmon into the conduction band of TiO₂...
February 6, 2019: Nanomaterials
https://read.qxmd.com/read/30736293/detection-of-histamine-dihydrochloride-at-low-concentrations-using-raman-spectroscopy-enhanced-by-gold-nanostars-colloids
#15
Eleazar Samuel Kolosovas-Machuca, Alexander Cuadrado, Hiram Joazet Ojeda-Galván, Luis Carlos Ortiz-Dosal, Aida Catalina Hernández-Arteaga, Maria Del Carmen Rodríguez-Aranda, Hugo Ricardo Navarro-Contreras, Javier Alda, Francisco Javier González
In this paper, we report a fast and easy method to detect histamine dihydrochloride using gold nanostars in colloidal aqueous solution as a highly active SERS platform with potential applications in biomedicine and food science. This colloid was characterized with SEM and UV⁻Vis spectroscopy. Also, numerical calculations were performed to estimate the plasmonic resonance and electric field amplification of the gold nanoparticles to compare the difference between nanospheres and nanostars. Finally, aqueous solutions of histamine dihydrochloride were prepared in a wide range of concentrations and the colloid was added to carry out SERS...
February 6, 2019: Nanomaterials
https://read.qxmd.com/read/30735028/shape-matters-gold-nanoparticle-shape-impacts-the-biological-activity-of-sirna-delivery
#16
Erin Morgan, Dominik Wupperfeld, Demosthenes P Morales, Norbert O Reich
Plasmon-resonant nanoparticles provide unprecedented spatio-temporal control over the release of diverse cargoes into cells. Here we compare the loading, release and internalization efficiencies, and effectiveness of post transcriptional gene silencing of hollow gold nanoshells, hollow gold nanocages, and gold nanorods with plasmons tuned to absorb near-infrared light at 800 nm. The hollow gold nanoshells can be loaded with up to three times more siRNA cargo compared to nanocages and nanorods; however, nanorods exhibit the highest efficiency of release of attached siRNA strands when exposed to pulsed 800 nm laser excitation...
February 8, 2019: Bioconjugate Chemistry
https://read.qxmd.com/read/30733548/imaging-of-nanoparticle-dynamics-in-live-and-apoptotic-cells-using-temporally-modulated-polarization
#17
Omer Wagner, Moty Schultz, Eitan Edri, Rinat Meir, Eran Barnoy, Amihai Meiri, Hagay Shpaisman, Eli Sloutskin, Zeev Zalevsky
Gold nanoparticles are widely exploited in phototherapy. Owing to their biocompatibility and their strong visible-light surface plasmonic resonance, these particles also serve as contrast agents for cell image enhancement and super-resolved imaging. Yet, their optical signal is still insufficiently strong for many important real-life applications. Also, the differentiation between adjacent nanoparticles is usually limited by the optical resolution and the orientations of non-spherical particles are unknown...
February 7, 2019: Scientific Reports
https://read.qxmd.com/read/30732383/high-resolution-large-scale-plasmonic-laser-color-printing-for-jewelry-applications
#18
G V Odintsova, E A Vlasova, Y M Andreeva, M K Moskvin, A S Krivonosov, E V Gorbunova, D V Pankin, O S Medvedev, M M Sergeev, N N Shchedrina, D S Lutoshina, V P Veiko
We offer to use optical features of surface plasmon resonance in Ag nanoparticles for jewelry application as a method for the well-controlled decoration of silver items. The novel approach of silver nanoparticles formation with sizes from 5 to 50 nm via nanosecond direct laser writing allows for controlling the reflectance spectra, thus creating a color image on precious metals with a high resolution of about 450 dpi without dyes or hazardous chemicals. Moreover, the large-scale color image can be applied in single-step processing with significant productivity of 2 cm2 per minute...
February 4, 2019: Optics Express
https://read.qxmd.com/read/30732345/two-color-surface-plasmon-resonance-nanosizer-for-gold-nanoparticles
#19
Quaid Zaman, Jefferson Souza, Omar Pandoli, Karlo Q Costa, Victor Dmitriev, Daniele Fulvio, Marco Cremona, Ricardo Q Aucelio, Giselle Fontes, Tommaso Del Rosso
We study the potentialities of a two-color Surface Plasmon Resonance (SPR) spectroscopy nanosizer by monitoring the assembling of a colloidal dispersion of citrate stabilized gold nanoparticles (AuNPs) on SiO2 surface. When the AuNPs/water composite's optical density layer is negligible and the electron mean-free path limitation is taken into account in the AuNPs' dielectric constant;s formulation, the surface density σ of the nanoparticle array and the statistical mean size <r> of the nanoparticles can be straightly determined by using two-color SPR spectroscopy in the context of Maxwell's Garnett theory...
February 4, 2019: Optics Express
https://read.qxmd.com/read/30732336/anisotropic-infrared-plasmonic-broadband-absorber-based-on-graphene-black-phosphorus-multilayers
#20
Yijun Cai, Kai-Da Xu, Naixing Feng, Rongrong Guo, Haijun Lin, Jinfeng Zhu
Two-dimensional materials (2DMs) such as graphene and black phosphorus (BP) have aroused considerable attentions in the past few years. Engineering and enhancing their light-matter interaction is possible due to their support for localized surface plasmon resonances in the infrared regime. In this paper, we have proposed an infrared broadband absorber consisting of multilayer graphene-BP nanoparticles sandwiched between dielectric layers. Benefiting from the properties of graphene and BP, the absorber exhibits both perfect broadband responses and strong anisotropy beyond individual graphene and BP layers...
February 4, 2019: Optics Express
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