Ultrathin Ruthenium(II) Complex–H4SiW12O40 Multilayer Film

2008 ◽  
Vol 8 (3) ◽  
pp. 1248-1253 ◽  
Author(s):  
Yu-Qi Zhang ◽  
Li-Hua Gao ◽  
Ke-Zhi Wang ◽  
Hong-Jun Gao ◽  
Ye-Liang Wang
Keyword(s):  
Atomic Force Microscopy ◽  
Cyclic Voltammetry ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Multilayer Film ◽  
Multilayer Films ◽  
Layer By Layer ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force

A dipolar Ru(II) complex, [(bpy)2Ru(bpbh)Ru(bpy)2](ClO4)4 {where bpbh = 1,6-bis-[2-(2-pyridyl) benzimidazoyl]hexane, bpy = 2,2′-bipyridine}, was synthesized and characterized. A multilayer film of at least 18 layers was successfully prepared by alternating adsorption of H4SiW12O40 and [Ru2(bpy)4(bpbh)](ClO4)4 by electrostatic layer-by-layer self-assembly. The multilayer films were studied by ultraviolet-visible and X-ray photoelectron spectroscopy, atomic force microscopy, and cyclic voltammetry.

Solvent-Assisted Self-Assembly of ZnO Nanoparticles on Mica and its Characterization

2010 ◽  
Vol 152-153 ◽  
pp. 1830-1834
Author(s):  
Hua Lan Zhou ◽  
Zhong Zou ◽  
Sha Wu ◽  
Wen Jian Shi
Keyword(s):  
Atomic Force Microscopy ◽  
Zno Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Advanced Materials ◽  
Zno Nanostructures ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Solvent Density

Ordered nanostructure arrangement directly from solution onto surface is one of the important methods to synthesis advanced materials. In this paper, solvent-assisted self-assembly of ZnO nanoparticles on mica was investigated. Results showed ZnO nanoparticles were closely linked to each other and formed fork-like nanostructures on mica. ZnO nanostructures were characterized by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The possible mechanism of nanoparticle self-assembly was given. The decrease of solvent density led to the aggregation of nanoparticles. It may provide a simple and effective method to construct nanostructures.

Fabrication and Characterization of LuminescentMultilayer Films Based on Polyoxometalates and Fuchsin Basic

2011 ◽  
Vol 66 (1) ◽  
pp. 43-48
Author(s):  
Changyun Chen ◽  
Jun Peng ◽  
Yan Shen ◽  
Dan Chen ◽  
Huanqiu Zhang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Multilayer Film ◽  
Photoelectron Spectra ◽  
Layer By Layer ◽  
X Ray ◽  
Force Microscopy ◽  
Assembly Method ◽  
Atomic Force ◽  
Fabrication And Characterization

A luminescent multilayer film has been fabricated from the polyoxometalate anion α- [PMo12O40]3− (α-PMo12) and the cation Fuchsin Basic (FB) through an electrostatic layer-by-layer (LbL) self-assembly method and characterized by UV/Vis spectra, atomic force microscopy and X-ray photoelectron spectra. The fluorescence properties of the LbL film have also been investigated. Cyclic voltammetry measurements have demonstrated that the electrochemical properties of the polyoxometalate and FB are maintained in the multilayer film, which exhibits electrocatalytic activity for the reduction of bromate

Fabrication and Properties of a Nanocomposite Multilayer Film Based on a Polyoxometalate

2012 ◽  
Vol 67 (7) ◽  
pp. 673-677
Author(s):  
Jihong Liu ◽  
Tao Dong ◽  
Shuang Li ◽  
Huiyuan Ma ◽  
Bo Liu
Keyword(s):  
Atomic Force Microscopy ◽  
Self Assembly ◽  
Multilayer Film ◽  
Color Change ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Assembly Method ◽  
Atomic Force ◽  
Good Electrocatalytic Activity ◽  
Vis Spectroscopy

A nanocomposite multilayer film based on a polyoxometalate Na16[P4W30Mn4 (H2O)2O112]·xH2O (Mn4P4W30) was fabricated by the layer-by-layer self-assembly method. It was characterized by UV/Vis spectra and atomic force microscopy (AFM). The electrochromic and electrocatalytic properties were explored using chronoamperometry (CA), UV/Vis spectroscopy and cyclovoltammetry (CV). The attractable feature is a color change of the film by the reduction of the polyoxometalate at different potentials. The film also exhibits good electrocatalytic activity toward the reduction of IO3-.

Investigation of Ti/CuO interface by X-ray photoelectron spectroscopy and atomic force microscopy

2018 ◽  
Vol 51 (2) ◽  
pp. 246-253
Author(s):  
Dev Raj Chopra ◽  
Justin Seth Pearson ◽  
Darius Durant ◽  
Ritesh Bhakta ◽  
Anil R. Chourasia
Keyword(s):  
Atomic Force Microscopy ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force

Characterization of X-ray irradiated graphene oxide coatings using X-ray diffraction, X-ray photoelectron spectroscopy, and atomic force microscopy

2013 ◽  
Vol 28 (2) ◽  
pp. 68-71 ◽  
Author(s):  
Thomas N. Blanton ◽  
Debasis Majumdar
Keyword(s):  
Atomic Force Microscopy ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
High Energy ◽  
X Ray Diffraction ◽  
Carbon Phase ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After

In an effort to study an alternative approach to make graphene from graphene oxide (GO), exposure of GO to high-energy X-ray radiation has been performed. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) have been used to characterize GO before and after irradiation. Results indicate that GO exposed to high-energy radiation is converted to an amorphous carbon phase that is conductive.

Tailoring surface properties of functionalized graphene papers aiming to enzyme immobilization

2021 ◽  
Author(s):  
Jéssica Luzardo ◽  
Douglas Aguiar ◽  
Alexander Silva ◽  
Sanair Oliveira ◽  
Braulio Archanjo ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Photoelectron Spectroscopy ◽  
Enzyme Stability ◽  
Immobilized Enzymes ◽  
Free Enzyme ◽  
X Ray ◽  
Force Microscopy ◽  
Enzyme Solution ◽  
Atomic Force ◽  
Composition And Structure

The use of enzymes as catalysts requires recovery and reuse to make the process viable. Enzymatic immobilization changes enzyme stability, activity, and specificity. It is very important to explore new substrates for immobilization with appropriate composition and structure to improve the efficiency of the immobilized enzymes. This work explores the use of two different graphene oxide papers, one produced by oxidation route (GO) and the other by electrochemical synthesis (EG), aiming for β-galactosidase immobilization. The chemical and structural properties of these two papers were characterized by Raman spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Atomic force microscopy images showed that EG paper ensured more efficient immobilization of the enzymes on the surface of the paper. Cyclic voltammetry was used to monitor the reaction of conversion of lactose to glucose in the free enzyme solution and graphene paper immobilized enzyme solutions. The cyclic voltammetry analysis showed that immobilized enzymes on GO paper showed an improvement in the activity of β-galactose when compared to free enzyme solution, as well as enzyme immobilized on a glassy carbon electrode.

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