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Gold nanoparticles grown inside carbon nanotubes: synthesis and electrical transport measurements

The hybrid structures composed of gold nanoparticles and carbon nanotubes were prepared using porous alumina membranes as templates. Carbon nanotubes were synthesized inside the pores of these templates by the non-catalytic decomposition of acetylene. The inner cavity of the supported tubes was used...

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Autores principales: Segura, Rodrigo A, Contreras, Claudia, Henriquez, Ricardo, Häberle, Patricio, Acuña, José Javier S, Adrian, Alvaro, Alvarez, Pedro, Hevia, Samuel A
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4029962/
https://www.ncbi.nlm.nih.gov/pubmed/24910571
http://dx.doi.org/10.1186/1556-276X-9-207
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author Segura, Rodrigo A
Contreras, Claudia
Henriquez, Ricardo
Häberle, Patricio
Acuña, José Javier S
Adrian, Alvaro
Alvarez, Pedro
Hevia, Samuel A
author_facet Segura, Rodrigo A
Contreras, Claudia
Henriquez, Ricardo
Häberle, Patricio
Acuña, José Javier S
Adrian, Alvaro
Alvarez, Pedro
Hevia, Samuel A
author_sort Segura, Rodrigo A
collection PubMed
description The hybrid structures composed of gold nanoparticles and carbon nanotubes were prepared using porous alumina membranes as templates. Carbon nanotubes were synthesized inside the pores of these templates by the non-catalytic decomposition of acetylene. The inner cavity of the supported tubes was used as nanoreactors to grow gold particles by impregnation with a gold salt, followed by a calcination-reduction process. The samples were characterized by transmission electron microscopy and X-ray energy dispersion spectroscopy techniques. The resulting hybrid products are mainly encapsulated gold nanoparticles with different shapes and dimensions depending on the concentration of the gold precursor and the impregnation procedure. In order to understand the electronic transport mechanisms in these nanostructures, their conductance was measured as a function of temperature. The samples exhibit a ‘non-metallic’ temperature dependence where the dominant electron transport mechanism is 1D hopping. Depending on the impregnation procedure, the inclusion of gold nanoparticles inside the CNTs can introduce significant changes in the structure of the tubes and the mechanisms for electronic transport. The electrical resistance of these hybrid structures was monitored under different gas atmospheres at ambient pressure. Using this hybrid nanostructures, small amounts of acetylene and hydrogen were detected with an increased sensibility compared with pristine carbon nanotubes. Although the sensitivity of these hybrid nanostructures is rather low compared to alternative sensing elements, their response is remarkably fast under changing gas atmospheres.
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spelling pubmed-40299622014-06-06 Gold nanoparticles grown inside carbon nanotubes: synthesis and electrical transport measurements Segura, Rodrigo A Contreras, Claudia Henriquez, Ricardo Häberle, Patricio Acuña, José Javier S Adrian, Alvaro Alvarez, Pedro Hevia, Samuel A Nanoscale Res Lett Nano Express The hybrid structures composed of gold nanoparticles and carbon nanotubes were prepared using porous alumina membranes as templates. Carbon nanotubes were synthesized inside the pores of these templates by the non-catalytic decomposition of acetylene. The inner cavity of the supported tubes was used as nanoreactors to grow gold particles by impregnation with a gold salt, followed by a calcination-reduction process. The samples were characterized by transmission electron microscopy and X-ray energy dispersion spectroscopy techniques. The resulting hybrid products are mainly encapsulated gold nanoparticles with different shapes and dimensions depending on the concentration of the gold precursor and the impregnation procedure. In order to understand the electronic transport mechanisms in these nanostructures, their conductance was measured as a function of temperature. The samples exhibit a ‘non-metallic’ temperature dependence where the dominant electron transport mechanism is 1D hopping. Depending on the impregnation procedure, the inclusion of gold nanoparticles inside the CNTs can introduce significant changes in the structure of the tubes and the mechanisms for electronic transport. The electrical resistance of these hybrid structures was monitored under different gas atmospheres at ambient pressure. Using this hybrid nanostructures, small amounts of acetylene and hydrogen were detected with an increased sensibility compared with pristine carbon nanotubes. Although the sensitivity of these hybrid nanostructures is rather low compared to alternative sensing elements, their response is remarkably fast under changing gas atmospheres. Springer 2014-05-03 /pmc/articles/PMC4029962/ /pubmed/24910571 http://dx.doi.org/10.1186/1556-276X-9-207 Text en Copyright © 2014 Segura et al.; licensee Springer. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
spellingShingle Nano Express
Segura, Rodrigo A
Contreras, Claudia
Henriquez, Ricardo
Häberle, Patricio
Acuña, José Javier S
Adrian, Alvaro
Alvarez, Pedro
Hevia, Samuel A
Gold nanoparticles grown inside carbon nanotubes: synthesis and electrical transport measurements
title Gold nanoparticles grown inside carbon nanotubes: synthesis and electrical transport measurements
title_full Gold nanoparticles grown inside carbon nanotubes: synthesis and electrical transport measurements
title_fullStr Gold nanoparticles grown inside carbon nanotubes: synthesis and electrical transport measurements
title_full_unstemmed Gold nanoparticles grown inside carbon nanotubes: synthesis and electrical transport measurements
title_short Gold nanoparticles grown inside carbon nanotubes: synthesis and electrical transport measurements
title_sort gold nanoparticles grown inside carbon nanotubes: synthesis and electrical transport measurements
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4029962/
https://www.ncbi.nlm.nih.gov/pubmed/24910571
http://dx.doi.org/10.1186/1556-276X-9-207
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