Nano Archive

Carbon nanotubes randomly decorated with gold clusters: from nano 2 hybrid atomic structures to gas sensing prototypes

Charlier, J-C and Arnaud, L and Avilov, I V and Delgado, M and Demoisson, F and Espinosa, E H and Ewels, C P and Felten, A and Guillot, J and RIonescu, and Leghrib, R and Llobet, E and Mansour, A and Migeon, H-N and Pireaux, J-J and Reniers, F and Suarez-Martinez, I and Watson, G E and Zanolli, Z (2009) Carbon nanotubes randomly decorated with gold clusters: from nano 2 hybrid atomic structures to gas sensing prototypes. Nanotechnology, 20 (37). p. 375501.

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Carbon nanotube surfaces, activated and randomly decorated with metal nanoclusters, have been studied in uniquely combined theoretical and experimental approaches as prototypes for molecular recognition. The key concept is to shape metallic clusters that donate or accept a fractional charge upon adsorption of a target molecule, and modify the electron transport in the nanotube. The present work focuses on a simple system, carbon nanotubes with gold clusters. The nature of the gold–nanotube interaction is studied using first-principles techniques. The numerical simulations predict the binding and diffusion energies of gold atoms at the tube surface, including realistic atomic models for defects potentially present at the nanotube surface. The atomic structure of the gold nanoclusters and their effect on the intrinsic electronic quantum transport properties of the nanotube are also predicted. Experimentally, multi-wall CNTs are decorated with gold clusters using (1) vacuum evaporation, after activation with an RF oxygen plasma and (2) colloid solution injected into an RF atmospheric plasma; the hybrid systems are accurately characterized using XPS and TEM techniques. The response of gas sensors based on these nano 2 hybrids is quantified for the detection of toxic species like NO 2 , CO, C 2 H 5 OH and C 2 H 4 .

Item Type:Article
ID Code:11311
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:34
Last Modified:02 Nov 2011 00:47

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