Carbon nanostructures in silica aerogel composites

1995 ◽  
Vol 10 (2) ◽  
pp. 251-254 ◽  
Author(s):  
Xiang-Yun Song ◽  
Wanqing Cao ◽  
Michael R. Ayers ◽  
Arlon J. Hunt
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Silica Aerogel ◽  
Carbon Nanostructures ◽  
Silica Aerogels ◽  
New Method ◽  
Transmission Electron ◽  
Nested Structures

A new method of preparing carbon nanotubes and their derivatives using silica aerogels as a matrix for the deposition of carbon is repeated. We present results of observations of graphite tubes and rings including nested structures in nanometer dimensions using high resolution transmission electron microscopy. Furthermore, we propose a model for the growth of carbon nanotubes in three steps including nucleation, growth, and closure of tubes.

Carbon Nanotubes Functionalized by Nanoparticles of Platinum

2014 ◽  
Vol 793 ◽  
pp. 45-50 ◽  
Author(s):  
S. Capula-Colindres ◽  
K. Aguir ◽  
F. Cervantes-Sodi ◽  
L.A. Villa-Vargas ◽  
Vicente Garibay-Febles
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Gas Sensors ◽  
Pt Nanoparticles ◽  
Quick Response ◽  
Heterogeneous Distribution ◽  
Best Response ◽  
Transmission Electron

Carbon nanotubes (CNT) based gas sensors have attracted interest due to their excellent properties. Several studies have reported changes in the CNT’s electrical properties when functionalized with platinum (Pt) nanoparticles. In this investigation, the vapor phase impregnation decomposition (VPID) method was employed to incorporate Pt nanoparticles on CNT. Both, Pt nanoparticles and CNT were characterized by high resolution transmission electron microscopy (HR-TEM). The sensitivity of sensors based on CNT doped with Pt, was evaluated with ozone molecules. TEM images showed low and heterogeneous distribution on the surface of carbon nanotubes. The gas evaluation of CNT-Pt sensor presents good and quick response to ozone molecules at different concentrations and temperatures. The best response was found to be at 120 °C.

scholarly journals High resolution transmission electron microscopy analysis of conical carbon nanotubes formed in the high isostatic pressure apparatus

2021 ◽  
Vol 6 (1) ◽  
pp. 10-21
Author(s):  
Boris A. Kulnitskiy ◽  
Igor A. Perezhogin ◽  
Dmitriy V. Batov ◽  
Vladimir D. Blank ◽  
Yuriy L. Alshevskiy
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Transmission Electron Microscopy Analysis ◽  
Graphene Layers ◽  
Transmission Electron ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis

Carbon nanotubes with “herringbone” layers structure synthesized in high isostatic pressure apparatus were studied by High Resolution Transmission Electron Microscopy (HRTEM) methods. Seven different values of semi-apex angles of graphene layers were observed in different nanotubes. It is shown that semi-apex angles approximately equal to 5, 15, 25 и 35 can be regarded only to the scroll structure of the nanotubes, while 10, 20 and 30 can be regarded to both scroll either nested graphene layers curved to cones due to the embedding of the pentagon’s to them. Thus, the observation of all (seven) of these values of semi-apex angles testifies presence of scroll nanotubes in the sample under study, though it does not exclude presence of nested-cone nanotubes.

Structure of Antimony Sulfoiodide Ultrasonically Prepared in Carbon Nanotubes

2010 ◽  
Vol 163 ◽  
pp. 88-92 ◽  
Author(s):  
Danuta Stróż ◽  
M. Nowak ◽  
M. Jesionek ◽  
Katarzyna Bałdys
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Multiwalled Carbon Nanotubes ◽  
Medical Applications ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Antimony Sulfoiodide

This paper presents a brand new hybrid material on the nanometric scale: the antimony sulfoiodide (SbSI) within carbon nanotubes (CNTs). It was prepared in CNTs ultrasonically by using elemental antimony (Sb), sulfur (S) and iodide (I) in the presence of methanol under ultrasonic irradiation (34 kHz, 2.6 W/cm2). The sonochemical process was leaded for 3 hours at 323 K. The antimony sulfoiodide (SbSI) consisted in multiwalled carbon nanotubes (CNTs) were characterized high-resolution transmission electron microscopy (HRTEM). These investigations exhibit that the SbSI filling the CNTs has single-crystal structure in nature and in the form of multiwalled carbon nanotubes. The SbSI grown in CNTs are very promising materials for further investigations as well as for some industrial and medical applications.

In-situ Observations of Restructuring Carbon Nanotubes via Low-voltage Aberration-corrected Transmission Electron Microscopy

2011 ◽  
Vol 1284 ◽  
Author(s):  
Felix Börrnert ◽  
Alicja Bachmatiuk ◽  
Sandeep Gorantla ◽  
Jamie H. Warner ◽  
Bernd Büchner ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Carbon Nanostructures ◽  
Low Voltage ◽  
Single Wall Carbon Nanotubes ◽  
Structure And Dynamics ◽  
Transmission Electron ◽  
Aberration Corrected

ABSTRACTThe molecular structure and dynamics of carbon nanostructures is much discussed throughout the literature, mostly from the theoretical side because of a lack of suitable experimental techniques to adequately engage the problem. A technique that has recently become available is low-voltage aberration-corrected transmission electron microscopy. It is a valuable tool with which to directly observe the atomic structure and dynamics of the specimen in situ. Time series aberration-corrected low-voltage transmission electron microscopy is used to study the dynamics of single-wall carbon nanotubes in situ. We confirm experimentally previous theoretical predictions for the agglomeration of adatoms forming protrusions and subsequent removal. A model is proposed how lattice reconstruction sites spread. In addition, the complete healing of a multi-vacancy consisting of ca. 20 missing atoms in a nanotube wall is followed.

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