Single-walled carbon nanotubes and multiwalled carbon nanotubes functionalized with poly(L-lactic acid):: a comparative study

被引：43

作者：

Olalde, Beatriz ^{[1
]}

Aizpurua, Jesus M. ^{[2
]}

Garcia, Ainara ^{[1
]}

Bustero, Izaskun ^{[1
]}

Obieta, Isabel ^{[1
]}

Jurado, Maria J. ^{[1
]}

机构：

[1] INASMET TECHALIA, Unidad Salud, E-20009 San Sebastian, Spain

[2] Univ Basque Country, Joxe Mari Korta R&D Ctr, Dept Quim Organ 1, San Sebastian 20018, Spain

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 29期

关键词：

D O I：

10.1021/jp800266j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Spectroscopic (Raman) and gravimetric (acid titration, TGA) techniques were compared to determine the functionalization degree of multiwalled carbon nanotubes (MWNTs) and single-walled carbon nanotubes (SWNTs) with poly(L-lactic acid) (PLLA), following a two-step oxidation/esterification process. After oxidation with HN03, carbon nanotubes (CNTs) were activated with thionyl chloride to the corresponding acid chlorides and then grafted with PLLA. FTIR spectroscopy confirmed the formation of very similarly grafted CNTPLLA materials for both SWNT and MWNT. But, according to chemical titration and TGA results, oxidized and esterified SWNT showed a significantly higher degree of functionalization than their MWNT counterparts. Contrary to these observations, the increase of the Raman IDUG ratio was higher for MWNT-derived materials than for the SWNT counterparts. Therefore, it was concluded that this spectroscopic technique is unsuitable for the quantitative determination of the degree of functionalization when MWNT and SWNT are compared.

引用

页码：10663 / 10667

页数：5

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