Ernest Mendoza et al 2008 Nanotechnology 19 075102 doi:10.1088/0957-4484/19/7/075102
Ernest Mendoza1, Jahir Orozco2, Cecilia Jiménez-Jorquera2, Ana B González-Guerrero1, Ana Calle3, Laura M Lechuga3 and César Fernández-Sánchez2
Show affiliationsIn this work we present the fabrication and characterization of immunosensors based on polystyrene (PS)–multiwalled carbon nanotube (MWCNT) composites. The electrochemical properties of the sensors have been investigated and show that the surface area is increased upon addition of the MWCNT–PS layer. Furthermore, a plasma activation process is used to partially remove the PS and expose the MWCNTs. This results in a huge increase in the electrochemical area and opens up the possibility of binding biomolecules to the MWCNT wall. The MWCNTs have been functionalized covalently with a model antibody (rabbit IgG). The biosensors have been tested using amperometric techniques and show detection limits comparable to standard techniques such as ELISA.
Issue 7 (20 February 2008)
Received 16 November 2007, in final form 19 December 2007
Published 29 January 2008
Ernest Mendoza et al 2008 Nanotechnology 19 075102
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