scholarly journals Tuning the Optical Properties of Au Nanoclusters by Designed Proteins

2021 ◽  
pp. 2101332
Author(s):  
Elena Lopez‐Martinez ◽  
Diego Gianolio ◽  
Saül Garcia‐Orrit ◽  
Victor Vega‐Mayoral ◽  
Juan Cabanillas‐Gonzalez ◽  
...  
Keyword(s):  
Optical Properties ◽  
Au Nanoclusters ◽  
Designed Proteins

Alloying Effects on the Optical Properties of Ag–Au Nanoclusters from TDDFT Calculations

2011 ◽  
Vol 115 (49) ◽  
pp. 24085-24091 ◽  
Author(s):  
Giovanni Barcaro ◽  
Michel Broyer ◽  
Nicola Durante ◽  
Alessandro Fortunelli ◽  
Mauro Stener
Keyword(s):  
Optical Properties ◽  
Au Nanoclusters ◽  
Tddft Calculations ◽  
Alloying Effects

scholarly journals Sensors Based on Metal Nanoclusters Stabilized on Designed Proteins

Biosensors ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 110 ◽  
Author(s):  
Antonio Aires ◽  
Elena Lopez-Martinez ◽  
Aitziber Cortajarena
Keyword(s):  
Reactive Oxygen Species ◽  
Optical Properties ◽  
Metal Ions ◽  
Temperature Sensors ◽  
Oxygen Species ◽  
Protein Scaffolds ◽  
Metal Nanoclusters ◽  
Designed Proteins ◽  
New Sensors ◽  
Potential Use

Among all new nanomaterials, metal nanoclusters (NCs) have attracted special attention due to their interesting optical properties, among others. Metal NCs have been recently studied and used as sensors for different analytes. However, there is a need to explore the potential of these new sensors in a systematic manner and to develop new systems to broaden the possibilities that sensing offers to the industry. In this work, we show the potential use of repeat protein scaffolds as versatile templates for the synthesis and stabilization of various metal NCs, specifically Au, Ag, and CuNCs. The resulting protein-metal NCs hybrids are evaluated as sensors for different stimuli such as temperature, ions, or reactive oxygen species (ROS). Among the three protein-metal NCs, all performed nicely as temperature sensors, AuNCs responded to metal ions, and AgNCs were able to detect ROS.

Protein stabilized Au nanoclusters: spectral properties and photostability

2016 ◽  
Vol 56 (1) ◽  
Author(s):  
Vilius Poderys ◽  
Marija Matulionytė-Safinė ◽  
Dainius Rupšys ◽  
Ričardas Rotomskis
Keyword(s):  
Optical Properties ◽  
Spectral Properties ◽  
Colloidal Stability ◽  
Coating Layer ◽  
Gold Nanoclusters ◽  
Therapeutic Agents ◽  
Hypsochromic Shift ◽  
Au Nanoclusters ◽  
Nanoparticle Coating ◽  
Delivered Dose

Bovine serum albumin stabilized gold nanoclusters (BSA-Au nanoclusters) have been widely studied due to their possible applications in biomedicine as sensors, fluorescent or multi-modality markers, and therapeutic agents. Synthesis and optical properties of these nanoclusters have been extensively investigated; however, there is still very little data on photostability of BSA-Au nanoclusters. Photostability of BSA-Au nanoclusters is of major importance for a variety of applications, such as material sensing and fluorescence imaging. Herein we demonstrate that after synthesis the BSA-Au solution has two photoluminescence (PL) bands peaking at 468 and 660 nm. Nevertheless, a different behaviour of the PL bands at 468 and 660 nm upon irradiation indicates that only band at 660 nm is related to PL of Au nanoclusters. BSA-Au nanoclusters exhibit great colloidal stability and do not undergo irreversible changes when heated up to 65 °C. However, irradiation of BSA-Au nanoclusters causes a wavelength dependent decrease of intensity and a hypsochromic shift of the PL band at 660 nm which is proportional to the delivered dose. The shift of the PL band at 660 nm could occur due to loss of several gold atoms in Au nanoclusters and/or due to deterioration of a nanoparticle coating layer. We have also demonstrated that the photostability of BSA-Au nanoclusters increases in the cell growth medium.

Nonlinear optical properties of Au nanoclusters encapsulated into hybrid block copolymer micelles

2008 ◽  
Vol 205 (11) ◽  
pp. 2635-2638 ◽  
Author(s):  
K. Iliopoulos ◽  
D. Athanasiou ◽  
A. Meristoudi ◽  
N. Vainos ◽  
S. Pispas ◽  
...  
Keyword(s):  
Optical Properties ◽  
Block Copolymer ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Au Nanoclusters ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Optical properties of Ag–Au nanoclusters for sulphide sensing from TDDFT calculations

2015 ◽  
Vol 653 ◽  
pp. 363-368 ◽  
Author(s):  
Le Chang ◽  
Zhiping Liu ◽  
Daojian Cheng
Keyword(s):  
Optical Properties ◽  
Au Nanoclusters ◽  
Tddft Calculations

Insights into the effect of surface ligands on the optical properties of thiolated Au25nanoclusters

2016 ◽  
Vol 52 (30) ◽  
pp. 5234-5237 ◽  
Author(s):  
Xun Yuan ◽  
Nirmal Goswami ◽  
Weiliang Chen ◽  
Qiaofeng Yao ◽  
Jianping Xie
Keyword(s):  
Optical Properties ◽  
Au Nanoclusters ◽  
Surface Ligands ◽  
Structural Distortions ◽  
Ligand Shell ◽  
Effect Of Surface

Ligand shell engineering of Au nanoclusters could induce their structural distortions for generating interesting optical properties.

Optical Properties of Au Nanoclusters from TD-DFT Calculations

2011 ◽  
Vol 115 (14) ◽  
pp. 6277-6282 ◽  
Author(s):  
Nicola Durante ◽  
Alessandro Fortunelli ◽  
Michel Broyer ◽  
Mauro Stener
Keyword(s):  
Optical Properties ◽  
Dft Calculations ◽  
Au Nanoclusters ◽  
Td Dft

Design of objective lens for 200-kV high-resolution electron microscopes

1983 ◽  
Vol 41 ◽  
pp. 314-315
Author(s):  
K. Tsuno ◽  
T. Honda ◽  
Y. Harada ◽  
M. Naruse
Keyword(s):  
Optical Properties ◽  
Computer Technology ◽  
Axial Magnetic Field ◽  
Chromatic Aberration ◽  
Objective Lens ◽  
Resolution Electron ◽  
Correction Of Astigmatism ◽  
Three Stages ◽  
Electron Microscopes ◽  
Stage 1

Developement of computer technology provides much improvements on electron microscopy, such as simulation of images, reconstruction of images and automatic controll of microscopes (auto-focussing and auto-correction of astigmatism) and design of electron microscope lenses by using a finite element method (FEM). In this investigation, procedures for simulating the optical properties of objective lenses of HREM and the characteristics of the new lens for HREM at 200 kV are described.The process for designing the objective lens is divided into three stages. Stage 1 is the process for estimating the optical properties of the lens. Firstly, calculation by FEM is made for simulating the axial magnetic field distributions Bzc of the lens. Secondly, electron ray trajectory is numerically calculated by using Bzc. And lastly, using Bzc and ray trajectory, spherical and chromatic aberration coefficients Cs and Cc are numerically calculated. Above calculations are repeated by changing the shape of lens until! to find an optimum aberration coefficients.

Optical Properties of HVEM Accelerators

1975 ◽  
Vol 33 ◽  
pp. 180-181
Author(s):  
A. Strojnik ◽  
J.W. Scholl ◽  
V. Bevc
Keyword(s):  
Optical Properties ◽  
Electron Accelerator ◽  
Systematic Investigation ◽  
Electron Source ◽  
High Brightness ◽  
The Past ◽  
Wide Range ◽  
Optical Behavior

The electron accelerator, as inserted between the electron source (injector) and the imaging column of the HVEM, is usually a strong lens and should be optimized in order to ensure high brightness over a wide range of accelerating voltages and illuminating conditions. This is especially true in the case of the STEM where the brightness directly determines the highest resolution attainable. In the past, the optical behavior of accelerators was usually determined for a particular configuration. During the development of the accelerator for the Arizona 1 MEV STEM, systematic investigation was made of the major optical properties for a variety of electrode configurations, number of stages N, accelerating voltages, 1 and 10 MEV, and a range of injection voltages ϕ0 = 1, 3, 10, 30, 100, 300 kV).

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