scholarly journals Noncovalent Interaction between Gold Nanoparticles and Multiwalled Carbon Nanotubes via an Intermediatory

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
Jui-Ming Yeh ◽  
Kuan-Yeh Huang ◽  
Su-Yin Lin ◽  
Yu-Yao Wu ◽  
Chao-Chen Huang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Self Assembly ◽  
Thiol Group ◽  
Noncovalent Interaction ◽  
Multiwalled Carbon ◽  
Au Nps ◽  
Multi Walled Carbon Nanotubes ◽  
Self Assembled ◽  
Reflectance Ftir

A new and effective method has been developed where self-assembled gold nanoparticles (Au-NPs) of ∼10 nm diameter are successfully attached onto the surface of sidewalls and ends of thiol-terminated multi-walled carbon nanotubes (MWNTs) functionalized with orthomercaptoaniline, acting as a bridging agent. It can bridge the carbon nanotubes (CNTs) and Au-NPs via the bi-functional moiety with benzene unit at one end and thiol group at the other end by self-assembly. Theortho-mercaptoaniline was first grafted onto the surface of the CNTs viaπ-πinteraction between the benzene ring of the mercaptoaniline andπ-conjugated body of MWNTs surface to produce thiol-terminated CNTs. The bare surface of Au-NPs facilitates to attach on the thiol group of the thiol-terminated CNTs. Attenuated total reflectance FTIR, UV-visible, Raman spectroscopy and X-ray powder diffraction studies were used to verify whether the mercapto-benzene moieties have been attached to theπ-conjugated body of functionalized MWNTs. The direct evidence is obtained from transmission electron microscope (TEM) images where self-assembled Au-NPs are attached onto the functionalized MWNTs.

NEW AMINE FUNCTIONAL IONIC LIQUID AS BUILDING BLOCK IN NANOTECHNOLOGY

NANO ◽  
2007 ◽  
Vol 02 (03) ◽  
pp. 169-173 ◽  
Author(s):  
REBECA MARCILLA ◽  
DAVID MECERREYES ◽  
IBON ODRIOZOLA ◽  
JOSE A. POMPOSO ◽  
JAVIER RODRIGUEZ ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Ionic Liquid ◽  
Building Block ◽  
Amine Group ◽  
Functional Nanomaterials ◽  
Au Nps ◽  
Functionalized Ionic Liquid ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this communication, we report the synthesis of an amino-functionalized ionic liquid (AFIL) and its application as building block in the construction of new functional nanomaterials. This AFIL has been used as surfactant in the synthesis of gold nanoparticles ( Au NPs) and in the development of functional CNTs/IL hybrid nanomaterials by mixing the AFIL with multi-walled carbon nanotubes (MWCNTs). The presence of an amine group in the ionic liquid provides to the resultant nanomaterial with new opportunities in several applications in the nanobio field.

A New Immunosensor for Serum Myeloperoxidase Based on Self-Assembly of Multi-Walled Carbon Nanotubes/Thionine/Gold Nanoparticles-Chitosan

2011 ◽  
Vol 343-344 ◽  
pp. 1207-1211 ◽  
Author(s):  
Qi Zhi Diao ◽  
Yuan Li ◽  
Mi Zhou ◽  
Guo Ming Xie
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Self Assembly ◽  
Specific Binding ◽  
Electrochemical Immunosensor ◽  
Enzyme Linked Immunosorbent Assay ◽  
Current Signal ◽  
Multi Walled Carbon Nanotubes ◽  
Response Current ◽  
Walled Carbon Nanotubes

A new electrochemical immunosensor for serum myeloperoxidase (MPO) has been developed based on the self-assembly multilays of multi-walled carbon nanotubes (MWNTs), thionine (THI), gold nanoparticles (GNPs) and chitosanon (CHIT) on the glassy carbon electrode (GCE). The antibody of MPO (anti-MPO) was absorbed on the surface of GNPs monolayer. Horseradish peroxidase (HRP) was employed to block non-specific binding and amplify the response current signal. It was observed that the peak current was linear with the MPO concentration in a range of 2.5-125 µgl-1. The detection limit was 1.425 µgl-1 (S/N=3). Correlation analysis showed that this new immunosensor assay has a significant correlation with enzyme-linked immunosorbent assay (ELISA) (r=0.96, p>0.05) for 40 clinical specimens.

Self-Assembled Morphologies of Diblock Copolymers Confined in Multiwalled Carbon Nanotubes

2013 ◽  
Vol 815 ◽  
pp. 512-515
Author(s):  
Yu Xin Zuo ◽  
Guo Qing Wang ◽  
Ying Yu ◽  
Chun Cheng Zuo ◽  
Yi Rui Wang
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Self Assembly ◽  
Diblock Copolymers ◽  
Three Dimensional ◽  
Md Simulations ◽  
Surface Interactions ◽  
Coarse Grained ◽  
Multiwalled Carbon ◽  
Self Assembled

Self-assembly of symmetric diblock copolymers (DCP) confined in multiwalled carbon nanotubes (MWCNTs) is studied using coarse-grained molecular dynamic (MD) simulations. The dependence of the self-assembled morphologies on the strength of the surface interactions is examined systematically. A rich variety of novel morphologies under the three-dimensional confinement have been revealed. The adsorption energy and cohesive energy have been discussed qualitatively and used to account for the appearance of the complex morphological transition.

Molecularly Imprinted Sensor for Ascorbic Acid Based on Gold Nanoparticles and Multiwalled Carbon Nanotubes

2020 ◽  
Vol 16 (7) ◽  
pp. 905-913
Author(s):  
Youyuan Peng ◽  
Qingshan Miao
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Ascorbic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Ph Value ◽  
Biological Fluids ◽  
Water Soluble ◽  
Multiwalled Carbon ◽  
Experimental Conditions ◽  
Molecularly Imprinted

Background: L-Ascorbic acid (AA) is a kind of water soluble vitamin, which is mainly present in fruits, vegetables and biological fluids. As a low cost antioxidant and effective scavenger of free radicals, AA may help to prevent diseases such as cancer and Parkinson’s disease. Owing to its role in the biological metabolism, AA has also been utilized for the therapy of mental illness, common cold and for improving the immunity. Therefore, it is very necessary and urgent to develop a simple, rapid and selective strategy for the detection of AA in various samples. Methods: The molecularly imprinted poly(o-phenylenediamine) (PoPD) film was prepared for the analysis of L-ascorbic acid (AA) on gold nanoparticles (AuNPs) - multiwalled carbon nanotubes (MWCNTs) modified glass carbon electrode (GCE) by electropolymerization of o-phenylenediamine (oPD) and AA. Experimental parameters including pH value of running buffer and scan rates were optimized. Scanning electron microscope (SEM), fourier-transform infrared (FTIR) spectra, cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were utilized for the characterization of the imprinted polymer film. Results: Under the selected experimental conditions, the DPV peak currents of AA exhibit two distinct linear responses ranging from 0.01 to 2 μmol L-1 and 2 to 100 μmol L-1 towards the concentrations of AA, and the detection limit was 2 nmol L-1 (S/N=3). Conclusion: The proposed electrochemical sensor possesses excellent selectivity for AA, along with good reproducibility and stability. The results obtained from the analysis of AA in real samples demonstrated the applicability of the proposed sensor to practical analysis.

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