Photochemical processes developed in composite based on highly separated metallic and semiconducting SWCNTs functionalized with polydiphenylamine

Autor:	Ioan Baltog, Arnaud Magrez, Mihaela Baibarac, Ion Smaranda
Rok vydání:	2015
Předmět:	Photoluminescence Materials science Composite number Doping General Chemistry Carbon nanotube Photochemistry law.invention Metal law visual_art Electrode visual_art.visual_art_medium General Materials Science Cyclic voltammetry Macromolecule
Zdroj:	Carbon. 81:426-438
ISSN:	0008-6223
Popis:	The electrochemical polymerization of diphenylamine (DPA) onto electrodes of Pt coated with highly separated metallic (98%) or semiconducting (99%) single-walled carbon nanotubes (SWCNTs) in the presence of H3PW12O40 was performed by cyclic voltammetry in order to obtain composite materials based on polydiphenylamine (PDPA) doped with heteropolyanions of H3PW12O40 and carbon nanotubes. Our data demonstrate that the photoluminescence quenching effect of the PDPA doped with H3PW12O40 heteropolyanions in the presence of SWCNTs is due to the metallic component. Under UV irradiation of SWCNTs highly separated in metallic and semiconducting tubes functionalized with PDPA doped with heteropolyanions of H3PW12O40 new photochemical reactions are evidenced by photoluminescence studies. These reactions lead to a shortening of the macromolecular chain of PDPA. The photochemical process is more intense in the case semiconducting SWCNTs functionalized with PDPA doped with heteropolyanions in comparison to metallic SWCNTs functionalized with PDPA in doped state, it being a consequence of an additional chemical interaction between the DPA dimer doped with H3PW12O40 heteropolyanions and semiconducting SWCNTs. (C) 2014 Elsevier Ltd. All rights reserved.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a62a0e964076527c49165cf0e0a23fe5 https://doi.org/10.1016/j.carbon.2014.09.075 Zobrazit plný text záznamu Full Text from ScienceDirect