scholarly journals Importance of ion bombardment during coverage of Au nanoparticles on their structural features and optical response

2014 ◽  
Vol 115 (12) ◽  
pp. 124303 ◽  
Author(s):  
V. Resta ◽  
R. J. Peláez ◽  
C. N. Afonso
Keyword(s):  
Au Nanoparticles ◽  
Ion Bombardment ◽  
Optical Response ◽  
Structural Features

Siderophore-inspired nanoparticle-based biosensor for the selective detection of Fe3+

2015 ◽  
Vol 3 (2) ◽  
pp. 270-275 ◽  
Author(s):  
Daniel J. Phillips ◽  
Gemma-Louise Davies ◽  
Matthew I. Gibson
Keyword(s):  
Au Nanoparticles ◽  
Optical Response ◽  
Selective Detection

Au nanoparticles modified with catechol-functionalised polymers provide a strong optical response which is highly specific to Fe3+ ions at physiologically relevant concentrations.

scholarly journals Plasmonic response and SERS modulation in electrochemical applied potentials

2017 ◽  
Vol 205 ◽  
pp. 537-545 ◽  
Author(s):  
G. Di Martino ◽  
V. A. Turek ◽  
C. Tserkezis ◽  
A. Lombardi ◽  
A. Kuhn ◽  
...  
Keyword(s):  
Applied Voltage ◽  
Au Nanoparticles ◽  
Electrochemical Cell ◽  
Optical Response ◽  
Electronic Interaction ◽  
Raman Amplification ◽  
Electrode Surfaces ◽  
Au Film

We study the optical response of individual nm-wide plasmonic nanocavities using a nanoparticle-on-mirror design utilised as an electrode in an electrochemical cell. In this geometry Au nanoparticles are separated from a bulk Au film by an ultrathin molecular spacer, giving intense and stable Raman amplification of 100 molecules. Modulation of the plasmonic spectra and the SERS response is observed with an applied voltage under a variety of electrolytes. Different scenarios are discussed to untangle the various mechanisms that can be involved in the electronic interaction between NPs and electrode surfaces.

Nanostructured biofunctionalized polyurethanes for applications in regenerative medicine

2012 ◽  
Vol 1417 ◽  
Author(s):  
Sebastian Kruss ◽  
Tobias Wolfram
Keyword(s):  
Electron Microscopy ◽  
Surface Engineering ◽  
Au Nanoparticles ◽  
Structural Features ◽  
Cellular Adhesion ◽  
Cellular Interactions ◽  
Force Microscopy ◽  
Transmission Electron ◽  
Adsorption Processes

ABSTRACTPolyurethane (PU) materials are used in a wide variety of implantable devices and technologies, e.g. stents, breast augmentation, nose surgery and bladder reconstruction. Despite the excellent chemical control for manufacturing bulk materials and the good biocompatibility, a major challenge remains interfacing of PU with biological environments. A chemically controlled surface engineering approach could improve desired protein adsorption processes and cellular interactions within different tissues, preventing uncontrolled events of the implant especially in early stages shortly after surgical procedures.To gain better control over the PU surfaces we polymerized different bulk PU materials and developed a transfer-nanolithography technique to deposit inorganic Au-nanoparticles with defined structural features on the PU surface. Different nanoparticle patterns were transferred and analyzed by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM). Topographical features of PU substrates were investigated by atomic force microscopy (AFM). Transferred Au-nanoparticles showed high stability on PU substrates even under extreme sonication conditions. In a final step, those nanoparticles were functionalized with peptides to facilitate cellular adhesion under physiologically relevant conditions. As proof of concept, rat embryonic fibroblast cells were cultured on a peptide functionalized PU interface and investigated by SEM.In conclusion, we developed a versatile method to prepare nanostructured and biofunctionalized PUs. These PUs showed good stability characteristics and in vitro biocompatibility in cell culture assays.

scholarly journals Tuning the optical response of cross-linked Fe@Au nanoparticles

2020 ◽  
Vol 514 ◽  
pp. 145921
Author(s):  
Najme Ahmadi ◽  
Reza Poursalehi ◽  
Andrei Kirilyuk ◽  
Mohammad Kazem Moravvej-Farshi
Keyword(s):  
Au Nanoparticles ◽  
Optical Response

Size- and Shape-Dependent Nonlinear Optical Response of Au Nanoparticles Embedded in Sapphire

2013 ◽  
Author(s):  
O. Sánchez-Dena ◽  
P. Mota-Santiago ◽  
L. Tamayo-Rivera ◽  
A. Crespo-Sosa ◽  
A. Oliver ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Au Nanoparticles ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Size And Shape

scholarly journals Effect of Structural Features of Polymer Gels Containing Au Nanoparticles on Their Catalytic Properties

2021 ◽  
Vol 54 (12) ◽  
pp. 648-656
Author(s):  
Gakuto Kato ◽  
Hayato Doi ◽  
Hidenori Ohashi ◽  
Hideaki Tokuyama
Keyword(s):  
Au Nanoparticles ◽  
Catalytic Properties ◽  
Polymer Gels ◽  
Structural Features
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