Gold Nanoparticles in DNA-Based Multilayer Films: Synthesis, Size Control, and Influence of the Multilayer Structure on Catalytic Properties

ChemNanoMat ◽  
2015 ◽  
Vol 2 (2) ◽  
pp. 125-132 ◽  
Author(s):  
Anatoly Zinchenko ◽  
Chihiro Nagahama ◽  
Shizuaki Murata
Keyword(s):  
Gold Nanoparticles ◽  
Multilayer Structure ◽  
Catalytic Properties ◽  
Size Control ◽  
Multilayer Films

Catalytic properties of gold nanoparticles immobilized on the surfaces of nanocarriers

2009 ◽  
Vol 12 (5) ◽  
pp. 1877-1887 ◽  
Author(s):  
Xi Chen ◽  
Dongyun Zhao ◽  
Yingli An ◽  
Linqi Shi ◽  
Wenchao Hou ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Properties

Characterisation of the opening behavior of multilayer films with cohesive failure mechanism by in situ peel tests in the ESEM

2021 ◽  
pp. 875608792110255
Author(s):  
M Heuser ◽  
A Zankel ◽  
C Mayrhofer ◽  
K Reincke ◽  
B Langer ◽  
...  
Keyword(s):  
Multilayer Structure ◽  
Peel Test ◽  
Multilayer Films ◽  
Cohesive Failure ◽  
Packaging Process ◽  
Flexible Packaging ◽  
Alignment Angle ◽  
Peel Tests ◽  
Bulge Formation

In this work, peel tests inside the chamber of an ESEM ( in situ peel tests) are described with heat-sealed test specimens of packaging systems made of multilayer films that simulate different flexible packaging types, according to the packaging line used. The in situ peel tests provided evidence to describe the influence of three different main aspects of the packaging process in relation to the opening behavior of the sealing packages. The investigated aspects are the peel angle, the alignment angle between the orientation of the multilayer films and the seal, and the bulge formation as a consequence of inadequate sealing parameters. In situ peel tests enabled the differentiation between peel angle and local (micro) peel angle, which results from the overall stiffness of the multilayer structure film. Alignment angles of 90° and 45° were found to produce similar opening forces. Images showing the formation of various new local micro fissures on new planes during the in situ peel test explained how the opening force can be dramatically increased during the tearing of two sealed multilayer films.

scholarly journals Protected Gold Nanoparticles with Thioethers and Amines As Surrogate Ligands

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
M. Rafiq H. Siddiqui
Keyword(s):  
Gold Nanoparticles ◽  
Variable Temperature ◽  
Size Control ◽  
Analytical Techniques ◽  
High Resolution Electron Microscopy ◽  
Phase Method ◽  
Two Phase ◽  
H Nmr ◽  
Resolution Electron ◽  
Vis Spectroscopy

Dodecyl sulfide, dodecyl amine, and hexylamine were shown to act as surrogate ligands (L) via metastable gold nanoparticles. By collating analytical and spectroscopic data obtained simultaneously, empirical formula Au24L was assigned. These impurity-free nanoparticles obtained in near quantitative yields showing exceptional gold assays (up to 98%Au) were prepared by a modification of the two-phase method. Replacement reactions on the Au24L showed that Au:L ratios may be increased (up to Au55:L (L= (H25C12)2S)) or decreased (Au12:L (L= H2NC12H25and H2NC6H13)) as desired. This work encompassing the role of analytical techniques used, that is, elemental analysis, variable temperature1H NMR, FAB mass spectrometry, UV-Vis spectroscopy, thin film X-ray diffraction, and high-resolution electron microscopy (HREM) has implications in the study of size control, purity, stability, and metal assays of gold nanoparticles.

scholarly journals On the Structural Origin of the Catalytic Properties of Inherently Strained Ultrasmall Decahedral Gold Nanoparticles

Nano Letters ◽  
2012 ◽  
Vol 12 (4) ◽  
pp. 2027-2031 ◽  
Author(s):  
Michael J. Walsh ◽  
Kenta Yoshida ◽  
Akihide Kuwabara ◽  
Mungo L. Pay ◽  
Pratibha L. Gai ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Properties

scholarly journals Electrodeposition–Assisted Assembled Multilayer Films of Gold Nanoparticles and Glucose Oxidase onto Polypyrrole-Reduced Graphene Oxide Matrix and Their Electrocatalytic Activity toward Glucose

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 993 ◽  
Author(s):  
Baoyan Wu ◽  
Shihua Hou ◽  
Yongyong Xue ◽  
Zhan Chen
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Glucose Oxidase ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Electrocatalytic Activity ◽  
Multilayer Films ◽  
Glucose Biosensor ◽  
Future Design ◽  
Reduced Graphene

The study reports a facile and eco-friendly approach for nanomaterial synthesis and enzyme immobilization. A corresponding glucose biosensor was fabricated by immobilizing the gold nanoparticles (AuNPs) and glucose oxidase (GOD) multilayer films onto the polypyrrole (PPy)/reduced graphene oxide (RGO) modified glassy carbon electrode (GCE) via the electrodeposition and self-assembly. PPy and graphene oxide were first coated on the surface of a bare GCE by the electrodeposition. Then, AuNPs and GOD were alternately immobilized onto PPy-RGO/GCE electrode using the electrodeposition of AuNPs and self-assembly of GOD to obtain AuNPs-GOD multilayer films. The resulting PPy-RGO-(AuNPs-GOD)n/GCE biosensors were used to characterize and assess their electrocatalytic activity toward glucose using cyclic voltammetry and amperometry. The response current increased with the increased number of AuNPs-GOD layers, and the biosensor based on four layers of AuNPs-GOD showed the best performance. The PPy-RGO-(AuNPs-GOD)4/GCE electrode can detect glucose in a linear range from 0.2 mM to 8 mM with a good sensitivity of 0.89 μA/mM, and a detection limit of 5.6 μM (S/N = 3). This study presents a promising eco-friendly biosensor platform with advantages of electrodeposition and self-assembly, and would be helpful for the future design of more complex electrochemical detection systems.

Effect of Composition on the Catalytic Properties of Mixed-Ligand-Coated Gold Nanoparticles

2011 ◽  
Vol 123 (34) ◽  
pp. 8046-8051 ◽  
Author(s):  
Anirban Ghosh ◽  
Soubir Basak ◽  
Benjamin H. Wunsch ◽  
Rajiv Kumar ◽  
Francesco Stellacci
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Properties ◽  
Mixed Ligand
Sign in / Sign up

Export Citation Format

Share Document