Carbon nanotubes carriers

Figure 11.6 Ultrasensitive bioassays of proteins and nucleic acids based on the amplification features of carbon-nanotube carriers and modified electrodes (Reproduced with permission from [51 ]. Copyright 2004, American Chemical Society)...

The high purity carbon nanotubes (CNTs) used in this study were obtained by decomposition of acetylene over a powdered CoxMgi xO solid solution catalyst [19]. Different proportions of CNTs from 15 to 70% and polyacrylonitrile (PAN, Aldrich) have been mixed in an excess of acetone to obtain a slurry. After evaporation of acetone, precursor electrodes were formed by pressing the CNTs/PAN mixture at 1-2 tons/cm2. The C/C composites were formed by carbonisation of the pellets at 700-900°C for 30-420 min under nitrogen flow [20], The optimal capacitance properties of the composite were obtained for a mixture CNTs/PAN (30/70 wt%) treated at 700°C. Such C/C composite remains still quite rich in nitrogen (9 at% of N) demonstrating that PAN is an efficient nitrogen carrier. On the other hand,... 

Fig. 10.16 Carbon nanotubes filled with quantum dots in a sodium alginate carrier solvent. The alginate encloses the dots into the tubes by sealing the tube ends. A large majority of excess alginate around the tubes was removed by repeated washing (Reprinted from Nadarajan et al., 2007. With permission from Elsevier) (See Color Plates)... 

The calculation of a Feshbach shape resonance has been carried out for a 2D superlattice of carbon nanotubes of period Ap on a 2D x,y plane shown in Fig. 4. The electronic structure is similar to the case of a superlattice of stripes [93-96,102] and this type of heterostructures at atomic limit can be classified as superlattices of quantum wires". While the charge carriers move as free charges in the x direction, the wire direction, they have to overcome a periodic potential barrier V(x,y), with period Ap, amplitude Vb... 

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