Polymeric nanocomposite films from functionalized vs suspended single-walled carbon nanotubes

Zhou, Bing; Lin, Yi; Hill, Darron E.; Wang, Wei; Veca, L. Monica; Qu, Lijun; Pathak, Pankaj; Meziani, Mohammed J.; Diaz, Julia M.; Connell, John W.; Watson, Kent A.; Allard, Lawrence F.; Sun, Ya‐Ping

doi:10.1016/j.polymer.2006.05.055

Cited by 31 publications

(22 citation statements)

References 30 publications

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“…The luminescence emission is generally brighter in better-functionalized and dispersed nanotubes due to the passivation of nanotube surface defects by the functionalization 22. In fact, resonance Raman and photoluminescence have been demonstrated as complementary characterization techniques in the evaluation on how well SWNTs are functionalized for their exfoliation into individual or thin bundles of nanotubes 22,23. Such a complementary relationship was reaffirmed in this study.…”

Section: Resultssupporting

confidence: 77%

Biodefunctionalization of Functionalized Single-Walled Carbon Nanotubes in Mice

et al. 2009

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Chemically modified carbon nanotubes with hydrophilic functionalities such as polyethylene glycols (PEGs) are widely pursued for potential biological and biomedical applications. In this study, PEGylated single-walled carbon nanotubes (PEG-SWNT) were intravenously administrated into mice to study their bio-defunctionalization in vivo by using complementary Raman and photoluminescence measurements. There was meaningful defunctionalization of PEG-SWNT in liver over time, but not in spleen under similar conditions. The evidence from spectroscopic characterization and analyses is presented, and mechanistic implications are discussed.

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Section: Resultssupporting

confidence: 77%

Biodefunctionalization of Functionalized Single-Walled Carbon Nanotubes in Mice

et al. 2009

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“…PBI molecules are characterized by their high thermal, physical, and chemical stabilities, mainly due to their rigid structures. [15] Recently, SWNT and multi-walled carbon nanotube (MWNT) composites with condensation polymers, especially thermostable polymers such as polyimide [16][17][18][19][20][21][22][23][24][25][26][27][28][29] and poly( p-phenylene benzobisoxazole) (PBO), [30][31][32][33] have attracted much attention, mainly for use in the aerospace industry. Among the many highly thermostable polymers, only PBI shows good solubility in common organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Individual Dissolution of Single‐Walled Carbon Nanotubes by Using Polybenzimidazole, and Highly Effective Reinforcement of Their Composite Films

Okamoto

Fujigaya

Nakashima

2008

Adv Funct Materials

103

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Polybenzimidazole (PBI) is shown to individually dissolve/disperse single‐walled carbon nanotubes (SWNTs) in N,N‐dimethylacetamide (DMAc), which is demonstrated by vis‐near IR absorption and photoluminescence spectroscopy and atomic force microscopy observations. By casting these dispersions, SWNTs/PBI composite films were successfully fabricated on substrates without any sign of macroscopic aggregation. The thermal stability and mechanical properties of the composite films were investigated using thermogravimetric analysis (TGA) and tensile tests, respectively, and it was found that, first, the addition of SWNTs to PBI does not deteriorate the thermal stability of the matrix film, and second, the mechanical properties of the PBI film were reinforced by ca. 50% with only 0.06 wt % addition of the SWNTs to the film without reducing the thermal stability of the PBI. Raman spectroscopy of the composite films revealed the existence of an interaction between the PBI and the SWNTs. The individual dissolution of the SWNTs and efficient reinforcement of the PBI are due to the π–π interaction between the PBI and the sidewalls of the SWNTs.

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“…Composites of polyimide (PI) with functionalization of CNTs have been widely studied in recent years, because of the unique combination of promising properties and construction of multifunctional structures of each component. These composites exhibit potentially superior thermal, electrical and mechanical properties to PI …”

Section: Introductionmentioning

confidence: 99%

Photoisomerization of electroactive polyimide/multiwalled carbon nanotube composites on the effect of electrochemical sensing for ascorbic acid

et al. 2014

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We present the first investigation of photoisomerization of the azo-based electroactive polyimide (PI)/amino-functionalized multiwalled carbon nanotube (MWCNT) composite electrode on the effect of electrochemical sensing for ascorbic acid (AA). First, MWCNTs were grafted with 4-aminobenzoic acid in a medium of polyphosphoric acid/phosphorous pentoxide to obtain MWCNTs functionalized with 4-aminobenzoyl groups (AF-MWCNTs). Subsequently, photoactive and electroactive PI/AF-MWCNT composites (PEPACCs) were prepared by introducing pendant conjugated oligoaniline (amino-capped aniline trimer) in the main chain and azobenzene chromophores in the side chain, in the presence of AF-MWCNTs. Photoactive and electroactive PI (PEPI) and PEPACCs were characterized by 1 H NMR spectra, UV−visible absorption spectra, cyclic voltammetry (CV) and transmission electron microscopy. The CV study shows that the PEPACCs have higher electroactivity than PEPI. The redox and reversible photoisomerization (i.e. cis ↔ trans) behavior of PEPACCs was analyzed by in situ monitoring through systematic studies of CV and UV−visible spectroscopy. The light of the UV lamp was 365 nm. It should be noted that the sensor constructed from a trans-PEPACC-modified carbon-paste electrode (CPE) demonstrated a higher electrocatalytic activity by 2.75-fold and 1.12-fold towards the oxidation of AA compared with those constructed using a PEPI-and cis-PEPACC-modified CPE, respectively. The detection limit of the trans-PEPACC-modified electrode was 1.73-fold and 1.70-fold lower than that of PEPI-and cis-PEPACC-modified CPE. Moreover, the differential pulse voltammetry data showed that the trans-PEPACC-modified electrode had high electrochemical sensing ability for the determination of AA, dopamine and uric acid.

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Polymeric nanocomposite films from functionalized vs suspended single-walled carbon nanotubes

Cited by 31 publications

References 30 publications

Biodefunctionalization of Functionalized Single-Walled Carbon Nanotubes in Mice

Biodefunctionalization of Functionalized Single-Walled Carbon Nanotubes in Mice

Individual Dissolution of Single‐Walled Carbon Nanotubes by Using Polybenzimidazole, and Highly Effective Reinforcement of Their Composite Films

Photoisomerization of electroactive polyimide/multiwalled carbon nanotube composites on the effect of electrochemical sensing for ascorbic acid

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