Baibarac Mihaela, Matea Adelina, Daescu Monica, Mercioniu Ionel, Quillard Sophie, Mevellec Jean-Yves, Lefrant Serge
National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, P.O. Box MG-7, R077125, Bucharest, Romania.
Faculty of Physics, University of Bucharest, 405A Atomistilor, P.O. Box MG-1, 077125, Bucharest, Romania.
Sci Rep. 2018 Jun 22;8(1):9518. doi: 10.1038/s41598-018-27769-4.
The influence of single-walled carbon nanotubes enriched in semiconductor (S-SWNTs) and metallic (M-SWNTs) tubes on the photoluminescence (PL) of polyaniline (PANI), electrosynthesized in the presence of the HSO and HCl solutions, is reported. The emission bands peaked at 407-418 and 440-520 nm indicate that the electropolymerization of aniline (ANI) leads to the formation of short and longer macromolecular chains (MCs), respectively. We demonstrate that the reaction product consists of ANI tetramers (TT) and trimers (TR) as well as PANI-salt. Using Raman scattering and IR absorption spectroscopy, a covalent functionalization of SWNTs with shorter and longer MCs of PANI-salt is demonstrated. The presence of S-SWNTs and M-SWNTs induces a decrease in ANI TT weight in the reaction product mass consisting in S-SWNTs and M-SWNTs covalently functionalized with PANI-emeraldine salt (ES) and PANI-leucoemeraldine salt (LS), respectively. A PANI PL quenching is reported to be induced of the S-SWNTs and M-SWNTs. A de-excitation mechanism is proposed to explain PANI PL quenching.
报道了富含半导体（S-SWNTs）和金属（M-SWNTs）管的单壁碳纳米管对在HSO和HCl溶液存在下电合成的聚苯胺（PANI）光致发光（PL）的影响。在407 - 418和440 - 520 nm处出现峰值的发射带分别表明苯胺（ANI）的电聚合导致了短和长的大分子链（MCs）的形成。我们证明反应产物由ANI四聚体（TT）和三聚体（TR）以及PANI盐组成。利用拉曼散射和红外吸收光谱，证明了SWNTs与PANI盐的短和长MCs发生了共价功能化。S-SWNTs和M-SWNTs的存在导致分别用PANI-翠绿亚胺盐（ES）和PANI-白翠绿亚胺盐（LS）共价功能化的S-SWNTs和M-SWNTs组成的反应产物质量中ANI TT重量的降低。据报道，S-SWNTs和M-SWNTs会引起PANI PL猝灭。提出了一种去激发机制来解释PANI PL猝灭。
