Electrocatalytic effect towards NADH induced by HiPco single-walled carbon nanotubes covalently functionalized by ferrocene derivatives

2013 ◽  
Vol 1531 ◽  
Author(s):  
Naoual Allali ◽  
Veronika Urbanova ◽  
Mathieu Etienne ◽  
Martine Mallet ◽  
Xavier Devaux ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Ferrocene Derivatives ◽  
Initial Sample ◽  
Covalent Functionalization ◽  
Single Walled Carbon ◽  
Residual Catalyst ◽  
Carbon Impurities ◽  
Electrocatalytic Effect ◽  
Walled Carbon Nanotubes

ABSTRACTThe present work reports the covalent functionalization of single-walled carbon nanotubes (SWCNTs) by ferrocene derivatives with polyethyleneglycol linkers. A very clean initial sample was chosen to avoid any residual catalyst and carbon impurities. Functionalized SWCNTs (f-CNTs) are deposited on the surface of a glassy carbon electrode (GCE) and this modified electrode is used for oxidizing the cofactor NADH (dihydronicotinamide adenine dinucleotide) in the presence of diaphorase. A clear electrocatalytic effect is evidenced, which can only be attributed to the f-CNTs.

scholarly journals Accurate control of the covalent functionalization of single-walled carbon nanotubes for the electro-enzymatically controlled oxidation of biomolecules

2018 ◽  
Vol 9 ◽  
pp. 2750-2762 ◽  
Author(s):  
Naoual Allali ◽  
Veronika Urbanova ◽  
Mathieu Etienne ◽  
Xavier Devaux ◽  
Martine Mallet ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Impurity Content ◽  
Single Walled Carbon Nanotubes ◽  
Reduced Form ◽  
Ferrocene Derivatives ◽  
Transmission Microscopy ◽  
Single Walled Carbon ◽  
Electrocatalytic Effect ◽  
Walled Carbon Nanotubes

Single-walled carbon nanotubes (SWCNTs) were functionalized by ferrocene through ethyleneglycol chains of different lengths (FcETGn) and the functionalized SWCNTs (f-SWCNTs) were characterized by different complementary analytical techniques. In particular, high-resolution scanning electron transmission microscopy (HRSTEM) and electron energy loss spectroscopy (EELS) analyses support that the outer tubes of the carbon-nanotube bundles were covalently grafted with FcETGn groups. This result confirms that the electrocatalytic effect observed during the oxidation of the reduced form of nicotinamide adenine dinucleotide (NADH) co-factor by the f-SWCNTs is due to the presence of grafted ferrocene derivatives playing the role of a mediator. This work clearly proves that residual impurities present in our SWCNT sample (below 5 wt. %) play no role in the electrocatalytic oxidation of NADH. Moreover, molecular dynamic simulations confirm the essential role of the PEG linker in the efficiency of the bioelectrochemical device in water, due to the favorable interaction between the ETG units and water molecules that prevents π-stacking of the ferrocene unit on the surface of the CNTs. This system can be applied to biosensing, as exemplified for glucose detection. The well-controlled and well-characterized functionalization of essentially clean SWCNTs enabled us to establish the maximum level of impurity content, below which the f-SWCNT intrinsic electrochemical activity is not jeopardized.

Reinforcement of silica with single-walled carbon nanotubes through covalent functionalization

2006 ◽  
Vol 16 (47) ◽  
pp. 4592 ◽  
Author(s):  
Yuanjian Zhang ◽  
Yanfei Shen ◽  
Dongxue Han ◽  
Zhijuan Wang ◽  
Jixia Song ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Covalent Functionalization ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Covalent Functionalization of Single-Walled Carbon Nanotubes with Thermoresponsive Core Cross-Linked Polymeric Micelles

2012 ◽  
Vol 45 (11) ◽  
pp. 4698-4706 ◽  
Author(s):  
Yonggui Li ◽  
Duanguang Yang ◽  
Alex Adronov ◽  
Yong Gao ◽  
Xujun Luo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Polymeric Micelles ◽  
Single Walled Carbon Nanotubes ◽  
Covalent Functionalization ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes
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