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Propriétés Electro-optiques des Nanomatériaux 1D/2D
(23) Production(s) de l'année 2017
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Morphology and anisotropy of thin conductive inkjet printed lines of single-walled carbon nanotubes 
Auteur(s): Torres-Canas F. J., Blanc C., Mašlík Jan, Tahir S., Izard N., Karasahin Senguel, Castellani Mauro, Dammasch Matthias, Zamora-Ledezma C., Anglaret E.
(Article) Publié:
Materials Research Express, vol. 4 p.035037 (2017)
Ref HAL: hal-01504984_v1
DOI: 10.1088/2053-1591/aa5687
WoS: 000398803200003
Exporter : BibTex | endNote
2 Citations
Résumé: We show that the properties of thin conductive inkjet printed lines of single-walled carbon nanotubes (SWCNT) can be greatly tuned, using only a few deposition parameters. The morphology, anisotropy and electrical resistivity of single-stroke printed lines are studied as a function of ink concentration and drop density. An original method based on coupled profilometry-Raman measurements is developed to determine the height, mass, orientational order and density profiles of SWCNT across the printed lines with a micrometric lateral resolution. Height profiles can be tuned from 'rail tracks' (twin parallel lines) to layers of homogeneous thickness by controlling nanotube concentration and drop density. In all samples, the nanotubes are strongly oriented parallel to the line axis at the edges of the lines, and the orientational order decreases continuously towards the center of the lines. The resistivity of 'rail tracks' is significantly larger than that of homogeneous deposits, likely because of large amounts of electrical dead-ends.
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Accurate determination of the chiral indices of individual carbon nanotubes by combining electron diffraction and Resonant Raman spectroscopy
Auteur(s): Levshov D., Tran H.-N., Paillet M., Arenal R., Than X. T., Zahab A. A., Yuzyuk Y. I., Sauvajol J.-L., Michel T.
(Article) Publié:
Carbon, vol. 114 p.141-159 (2017)
Texte intégral en Openaccess : 
Ref HAL: hal-01500547_v1
DOI: 10.1016/j.carbon.2016.11.076
WoS: WOS:000393249600018
Exporter : BibTex | endNote
19 Citations
Résumé: The experimental approach combining high resolution transmission electron microscopy (HRTEM), electron diffraction (ED) and resonant Raman spectroscopy (RRS) on the same free-standing individual carbon nanotubes (CNT) is the most efficient method to determine unambiguously the intrinsic features of the Raman-active phonons. In this paper, we review the main results obtained by the approach regarding the intrinsic features of the phonons of single-walled (SWNT) and double-walled carbon nanotubes (DWNT). First, we detail the different methods to identify the structure of SWNTs and DWNTs from the analysis of their electron diffraction patterns (EDP). In the following, we remind the principal features of the Raman response of SWNTs, unambiguously index-identified by ED. A special attention is devoted to the effect of the inter-layer interaction on the frequencies of the Raman-active phonons in index-identified DWNTs. The information obtained on index-identified SWNT and DWNT allows us to propose Raman criteria, which help identifying CNT when the ED fails to propose a single assignment. The efficiency of the Raman criteria as the complement to the ED information for the index-assignment of a few SWNTs and DWNTs is shown. The same approach to index-assign a triple-walled carbon nanotube (TWNT), by combining ED and RRS information, is reported.
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