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Synthesis of multi-walled carbon nanotube/polyhedral oligomeric silsesquioxane nanohybrid by utilizing click chemistry.

Yadav SK, Mahapatra SS, Yoo HJ, Cho JW - Nanoscale Res Lett (2011)

Bottom Line: A new hybrid material consisting of a polyhedral oligomeric silsesquioxane (POSS) and carbon nanotube (CNT) was synthesized by a simple and versatile approach entailing click coupling between azide moiety-functionalized POSS and alkyne-functionalized multi-walled CNTs.This approach provides a simple and convenient route to efficiently functionalize a wide variety of nanoscale nanostructure materials on the surface of CNTs.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Textile Engineering, Konkuk University, Seoul 143-701, Korea. jwcho@konkuk.ac.kr.

ABSTRACT
A new hybrid material consisting of a polyhedral oligomeric silsesquioxane (POSS) and carbon nanotube (CNT) was synthesized by a simple and versatile approach entailing click coupling between azide moiety-functionalized POSS and alkyne-functionalized multi-walled CNTs. This approach provides a simple and convenient route to efficiently functionalize a wide variety of nanoscale nanostructure materials on the surface of CNTs.

No MeSH data available.


UV-Vis absorption spectra and TGA analysis of nanomaterials. (A) UV-Vis absorption spectra of MWNT-POSS nanohybrid in different concentrations: (a) 0.01 mg/ml, (b) 0.005 mg/ml, (c) 0.002 mg/ml, and 0.001 mg/ml in THF. (B) TGA analysis of pristine MWNTs (a), MWNT-POSS nanohybrid (b), pure POSS (c), solubility test results (inset) of pristine MWNTs (P), and MWNT-POSS nanohybrid (F).
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Figure 6: UV-Vis absorption spectra and TGA analysis of nanomaterials. (A) UV-Vis absorption spectra of MWNT-POSS nanohybrid in different concentrations: (a) 0.01 mg/ml, (b) 0.005 mg/ml, (c) 0.002 mg/ml, and 0.001 mg/ml in THF. (B) TGA analysis of pristine MWNTs (a), MWNT-POSS nanohybrid (b), pure POSS (c), solubility test results (inset) of pristine MWNTs (P), and MWNT-POSS nanohybrid (F).

Mentions: Furthermore, XPS was additionally used to investigate the clicked surface. The XPS spectra of MWNT-POSS nanohybrid material are shown in Figure 5A. Three characteristic peaks at 285, 532, and 400 eV were observed for C 1s, O 1s, and N 1s, respectively. Two relatively weak signals were also observed at 102 and 152 eV, which are characteristic peaks of Si 2s and Si 2p, respectively, from the POSS cage. The N (1s) high-resolution peak for the MWNT-POSS nanohybrid (Figure 5B) suggests the presence of only one oxidation state of the nitrogen atom due to the formation of a 1,2,3-triazole ring [23], which confirms that the POSS-N3 molecule reacted with alkyne-functionalized MWNTs. The atomic percent and weight percent of Si for the MWNT-POSS nanohybrid were calculated by EDX measurment as 3.98 and 8.57%, respectively (Table 2). These results indicate the presence of POSS molecules on the surface of the MWNTs. The MWNT-POSS nanohybrid showed a typical electronic absorption spectrum of solubilized CNTs, and the absorbance decreased gradually in the UV to visible region (Figure 6a). As the POSS molecules have better reactivity and solubility in organic solvent, functionalization of POSS molecule with CNTs can substantially enhance the solubility and processability of the nanohybrid. Figure 6b (inset) shows the solubility test results of pristine MWNTs and the MWNT-POSS nanohybrid in THF at a concentration of 2.5 mg/mL. It is observed that the MWNT-POSS nanohybrid shows better dispersion stability than pristine MWNTs in THF after 4 weeks. The TGA analysis provides further evidence for functionalization of MWNTs with POSS (Figure 6b). TGA results show weight losses of 2, 6, and 19% at 700°C for pristine MWNTs, alkyne-functionalized MWNTs, and the MWNT-POSS nanohybrid, respectively. The difference in weight loss of alkyne-functionalized MWNTs and the MWNT-POSS nanohybrid is attributed to the presence of POSS molecules on the surface of the MWNTs [24,25]. TGA data of POSS show almost complete mass loss at temperatures over 450°C due to its sublimation [10].


Synthesis of multi-walled carbon nanotube/polyhedral oligomeric silsesquioxane nanohybrid by utilizing click chemistry.

Yadav SK, Mahapatra SS, Yoo HJ, Cho JW - Nanoscale Res Lett (2011)

UV-Vis absorption spectra and TGA analysis of nanomaterials. (A) UV-Vis absorption spectra of MWNT-POSS nanohybrid in different concentrations: (a) 0.01 mg/ml, (b) 0.005 mg/ml, (c) 0.002 mg/ml, and 0.001 mg/ml in THF. (B) TGA analysis of pristine MWNTs (a), MWNT-POSS nanohybrid (b), pure POSS (c), solubility test results (inset) of pristine MWNTs (P), and MWNT-POSS nanohybrid (F).
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Figure 6: UV-Vis absorption spectra and TGA analysis of nanomaterials. (A) UV-Vis absorption spectra of MWNT-POSS nanohybrid in different concentrations: (a) 0.01 mg/ml, (b) 0.005 mg/ml, (c) 0.002 mg/ml, and 0.001 mg/ml in THF. (B) TGA analysis of pristine MWNTs (a), MWNT-POSS nanohybrid (b), pure POSS (c), solubility test results (inset) of pristine MWNTs (P), and MWNT-POSS nanohybrid (F).
Mentions: Furthermore, XPS was additionally used to investigate the clicked surface. The XPS spectra of MWNT-POSS nanohybrid material are shown in Figure 5A. Three characteristic peaks at 285, 532, and 400 eV were observed for C 1s, O 1s, and N 1s, respectively. Two relatively weak signals were also observed at 102 and 152 eV, which are characteristic peaks of Si 2s and Si 2p, respectively, from the POSS cage. The N (1s) high-resolution peak for the MWNT-POSS nanohybrid (Figure 5B) suggests the presence of only one oxidation state of the nitrogen atom due to the formation of a 1,2,3-triazole ring [23], which confirms that the POSS-N3 molecule reacted with alkyne-functionalized MWNTs. The atomic percent and weight percent of Si for the MWNT-POSS nanohybrid were calculated by EDX measurment as 3.98 and 8.57%, respectively (Table 2). These results indicate the presence of POSS molecules on the surface of the MWNTs. The MWNT-POSS nanohybrid showed a typical electronic absorption spectrum of solubilized CNTs, and the absorbance decreased gradually in the UV to visible region (Figure 6a). As the POSS molecules have better reactivity and solubility in organic solvent, functionalization of POSS molecule with CNTs can substantially enhance the solubility and processability of the nanohybrid. Figure 6b (inset) shows the solubility test results of pristine MWNTs and the MWNT-POSS nanohybrid in THF at a concentration of 2.5 mg/mL. It is observed that the MWNT-POSS nanohybrid shows better dispersion stability than pristine MWNTs in THF after 4 weeks. The TGA analysis provides further evidence for functionalization of MWNTs with POSS (Figure 6b). TGA results show weight losses of 2, 6, and 19% at 700°C for pristine MWNTs, alkyne-functionalized MWNTs, and the MWNT-POSS nanohybrid, respectively. The difference in weight loss of alkyne-functionalized MWNTs and the MWNT-POSS nanohybrid is attributed to the presence of POSS molecules on the surface of the MWNTs [24,25]. TGA data of POSS show almost complete mass loss at temperatures over 450°C due to its sublimation [10].

Bottom Line: A new hybrid material consisting of a polyhedral oligomeric silsesquioxane (POSS) and carbon nanotube (CNT) was synthesized by a simple and versatile approach entailing click coupling between azide moiety-functionalized POSS and alkyne-functionalized multi-walled CNTs.This approach provides a simple and convenient route to efficiently functionalize a wide variety of nanoscale nanostructure materials on the surface of CNTs.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Textile Engineering, Konkuk University, Seoul 143-701, Korea. jwcho@konkuk.ac.kr.

ABSTRACT
A new hybrid material consisting of a polyhedral oligomeric silsesquioxane (POSS) and carbon nanotube (CNT) was synthesized by a simple and versatile approach entailing click coupling between azide moiety-functionalized POSS and alkyne-functionalized multi-walled CNTs. This approach provides a simple and convenient route to efficiently functionalize a wide variety of nanoscale nanostructure materials on the surface of CNTs.

No MeSH data available.