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A tool box to ascertain the nature of doping and photoresponse in single-walled carbon nanotubes

AuthorsSantidrián, Ana; González Domínguez, José Miguel; Diez-Cabanes, Valentin; Hernández-Ferrer, Javier; Maser, Wolfgang K. ; Benito, Ana M. ; Ansón Casaos, Alejandro ; Cornil, Jérôme; Ros, Tatiana da; Kalbáč, Martin
KeywordsRaman spectroscopy
Carbon nanotubes
Chemical functionalization
Espectroscopía Raman
Nanotubos de carbono
Funcionalización química
Issue Date23-Jan-2019
PublisherRoyal Society of Chemistry (Great Britain)
CitationPhysical Chemistry Chemical Physics 21: 4063-4071 (2019)
AbstractThe effect of doping on the electronic properties in bulk single-walled carbon nanotube (SWCNT) samples is studied for the first time using a new in situ Raman spectroelectrochemical method, and further verified by DFT calculations and photoresponse. We use p-/n-doped SWCNTs prepared by diazonium reactions as a versatile chemical strategy to control the SWCNT behavior. The measured and calculated data testify an acceptor effect of 4-aminobenzenesulfonic acid (p-doping), and a donor effect (n-doping) in the case of benzyl alcohol. In addition, pristine and covalently functionalized SWCNTs were used for the preparation of photoactive film electrodes. The photocathodic current in the photoelectrochemical cell is consistently modulated by the doping group. These results validate the in situ Raman spectroelectrochemistry as a unique tool box for predicting the electronic properties of functionalized SWCNTs in the form of thin films and their operational functionality in thin film devices for future optoelectronic applications.
Description6 Figuras. 3 Tablas.
Publisher version (URL)http://dx.doi.org/10.1039/c8cp06961a
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