Carbon Nanotubes Contain Residual Metal Catalyst Nanoparticles even after Washing with Nitric Acid at Elevated Temperature Because These Metal Nanoparticles Are Sheathed by Several Graphene Sheets

Langmuir ◽  
2007 ◽  
Vol 23 (11) ◽  
pp. 6453-6458 ◽  
Author(s):  
Martin Pumera
Keyword(s):  
Carbon Nanotubes ◽  
Elevated Temperature ◽  
Nitric Acid ◽  
Metal Nanoparticles ◽  
Metal Catalyst ◽  
Graphene Sheets ◽  
Catalyst Nanoparticles

Conductive nanomaterials for 2D and 3D printed flexible electronics

2019 ◽  
Vol 48 (6) ◽  
pp. 1712-1740 ◽  
Author(s):  
Alexander Kamyshny ◽  
Shlomo Magdassi
Keyword(s):  
Carbon Nanotubes ◽  
Metal Nanoparticles ◽  
Flexible Electronics ◽  
Graphene Sheets ◽  
Recent Developments ◽  
3D Printed ◽  
Conductive Nanomaterials ◽  
2D And 3D

This review describes recent developments in the field of conductive nanomaterials and their application in 2D and 3D printed flexible electronics, with particular emphasis on inks based on metal nanoparticles and nanowires, carbon nanotubes, and graphene sheets.

Anisotropic Magnetoresistance of Stretched Sheets of Carbon Nanotubes

2012 ◽  
Vol 1407 ◽  
Author(s):  
Elena Cimpoiasu ◽  
David Lashmore ◽  
Brian White ◽  
George A. Levin
Keyword(s):  
Magnetic Field ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Nitric Acid ◽  
Electric Current ◽  
Anisotropic Magnetoresistance ◽  
Catalyst Nanoparticles ◽  
Positive Term ◽  
The Magnetic Field ◽  
Bulk Carbon

ABSTRACTWe performed magnetoresistance (MR) measurements on bulk carbon nanotube sheets that had been partially aligned by post-fabrication stretching. The magnetic field was applied under different orientations with respect to the direction of the stretch, while the electric current was either parallel or perpendicular to the direction of the stretch. We found that the fielddependence of the MR is composed of two terms, one positive and one negative. The magnitudes of both terms are largest when the field is parallel with the direction of the stretch. If the sheets are treated with nitric acid, the positive term is removed and the MR is smallest when the field is aligned with the magnetic field. We attribute these anisotropic features to magnetoelastic effects induced by the coupling between the magnetic catalyst nanoparticles, the magnetic field, and the network of nanotubes.

scholarly journals Improvement of Electrochemical Activity of Pt/MWCNT Catalyst for Proton Exchange Membrane Fuel Cell

2014 ◽  
Vol 12 ◽  
pp. 20-23 ◽  
Author(s):  
Munkhshur Myekhlai ◽  
Battsengel Baatar ◽  
Bayardulam Jamiyansuren ◽  
Baasandorj Myagmarsuren
Keyword(s):  
Carbon Nanotubes ◽  
Sulfuric Acid ◽  
Fuel Cell ◽  
Nitric Acid ◽  
Proton Exchange Membrane ◽  
Catalyst Support ◽  
Proton Exchange ◽  
Metal Catalyst ◽  
Multi Walled Carbon Nanotubes ◽  
Exchange Membrane

In last years, the carbon nanotubes have been studied as an advanced metal catalyst support for proton exchange membrane fuel cell. This study focuses on the sonochemical treatment of multi walled carbon nanotubes (MWCNTs) as a platinum supporting material for proton exchange membrane fuel cell (PEMFC) by mixture of sulfuric acid and nitric acid and mixture of sulfuric acid and hydrogen peroxide. X-ray diffraction (XRD) and Infrared (IR) spectroscopy were used to characterize the surface of sonochemically treated MWCNT and nanostructured electrocatalyst Pt/MWCNT. According to the experimental results of this work, the surface of MWCNT can be more successfully functionalized with hydroxyl and carboxyl groups after sonochemical treatment by mixture of sulfuric acid and nitric acid. The particle size of prepared Pt -electrocatalyst on MWCNT was determined 3.4 nm by XRD.DOI: http://dx.doi.org/10.5564/mjc.v12i0.165 Mongolian Journal of Chemistry Vol.12 2011: 20-23

Studies of surface of metal nanoparticles in a flowing liquid with XPS

2018 ◽  
Vol 54 (71) ◽  
pp. 9981-9984 ◽  
Author(s):  
Luan Nguyen ◽  
Paul (Pengcheng) Tao ◽  
Huimin Liu ◽  
Mohamed Al-Hada ◽  
Matteo Amati ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Metal Catalyst ◽  
Catalyst Nanoparticles ◽  
Flowing Liquid

Surface of metal catalyst nanoparticles in a flowing liquid was characterized with XPS.

Improvement of Electrochemical Activity of Pt/MWCNT Catalyst for Proton Exchange Membrane Fuel Cell

2012 ◽  
Vol 1384 ◽  
Author(s):  
Battsengel Baatar ◽  
Bayardulam Jamiyansuren ◽  
Munkhshur Myakhlai ◽  
Baasandorj Myagmarsuren
Keyword(s):  
Carbon Nanotubes ◽  
Sulfuric Acid ◽  
Fuel Cell ◽  
Nitric Acid ◽  
Proton Exchange Membrane ◽  
Catalyst Support ◽  
Proton Exchange ◽  
Metal Catalyst ◽  
Multi Walled Carbon Nanotubes ◽  
Exchange Membrane

ABSTRACTIn last years, the carbon nanotubes have been studied as an advanced metal catalyst support for proton exchange membrane fuel cell. This study focuses on the sonochemical treatment of multi walled carbon nanotubes (MWCNTs) as a platinum supporting material for proton exchange membrane fuel cell (PEMFC) by mixture of sulfuric acid and nitric acid and mixture of sulfuric acid and hydrogen peroxide. X-ray diffraction (XRD) and Infrared (IR) spectroscopy were used to characterize the surface of sonochemically treated MWCNT and nanostructured electrocatalyst Pt/MWCNT. According to the experimental results of this work, the surface of MWCNT can be more successfully functionalized with hydroxyl and carboxyl groups after sonochemical treatment by mixture of sulfuric acid and nitric acid. The particle size of prepared Pt -electrocatalyst on MWCNT was determined 3.4 nm by XRD.

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