Carbon Nanoparticle Surface Modification for Sensor Development
|Katherine Lawrence 1, Norahim Ibrahim 1,2, Frank Marken 1, Tony D. James|
1. University of Bath, Department of Chemistry, Claverton Down, Bath BA2-7AY, United Kingdom
Emperor 2000® carbon nanoparticles are a form of carbon black with surface sodium sulfonate groups. This negative surface coverage is initially converted to positive amine functionality with reaction with a diamine.  The aminated carbon nanoparticles can then be subjected to further synthetic reactions.
Figure 1. Diamine functionalisation of Emperor 2000® CNPs .
Carbodiimide mediated peptide coupling reactions were employed and a range of small organic molecules were reacted with the aminated surface of the carbon nanoparticles. This resulted in a range of carbon nanoparticles with new surface functionality created via amide bond formation.
Figure 2. Boronic acid binding to terminal diol
By appending molecules with a free catechol unit to the carbon nanoparticles, there is the potential for them to be used for sensing applications.
Dopa-modified carbon nanoparticles have successfully demonstrated pH dependence which has been applied to gas pH sensing.  The modified nanoparticles have also been used detect boronic acids as the reaction of catechols and boronic acids is very favourable. 
 Watkins JD, Lawrence R, Taylor JE et al. Physical Chemistry Chemical Physics 12 (2010) 4872
 Ibrahim NB, Lawrence K, Xia F, James TD, Marken F manuscript submitted to Sensors and Actuators B - Chemical (2011)
 Lorand JP, Edwards JO Journal of Organic Chemistry 24 (1959) 769
Presentation: Short communication at SMCBS'2011 International Workshop, by Katherine Lawrence
See On-line Journal of SMCBS'2011 International Workshop
Submitted: 2011-09-02 16:24 Revised: 2011-09-02 16:24