SWCNTs SWNTs

PAne (PANi, SFST, 280 000 g/mol), DCAd (DCAA, Merck, 9 %) and 2-acrylamido-2-methyl-l-propane sulfonic acid (AMPSA, Aldrich, 9 %) were all used without arty further purification. Purified SWCNT (SWNTs, Hipco CNI) were used as pirrchased and contained 5 w % iron residue as determined by elemental analysis. 

HiPCO-SWCNTs were oxidized in a UV-03 gas-solid interface reaction and subsequently assembled on a rigid oligo(phenylenethynylene) self-assembled monolayer (SAM). In a chemical assembly , based on condensation between the carboxylic acid functionalities of the 03-oxidized SWNTs and the amine functionalities of the SAMs, SWCNT-amides were formed in ordered arrays [116]. 

The very effective ir-stacking interactions between aromatic molecules and the graphitic sidewalls of SWCNTs were demonstrated by the aggregation of the bifunctional N-succinimidyl-l-pyrenebutanoate [196], irreversibly adsorbed on the hydrophobic surfaces of the SWNT. With these conjugates, the succinimidyl group was nucleophilically substituted with amino groups from proteins such as ferritin or streptavidin (Fig. 1.14) and caused immobilization of the biopolymers at the tube surfaces [196],... 

In a related study [62], similar effects on conductivity of SWCNTs were reported, but here a comparison was also made between the effects of nitric acid reflux and air plasma treatment, and an attempt was made to relate the changes observed to the creation of defect sites. The authors did not offer a more concrete proposal regarding the nature of the sites involved in these treatments. After the acid treatment, Raman microscopy results indicated a dramatic change in SWNT electronic structure, and both treatments enhanced the electron transfer kinetics for the oxidation of inner-sphere dopamine. By contrast, both treatments had a negligible effect on the voltammetric response of a simple outer-sphere electron-transfer redox process Ru(NH3)63+/2+. ... 

Raman spectra of cubic BN to 21 GPa, in the temperature range 300-723 K, were used to derive values for the isothermal bulk modulus at ambient and high temperature.56 IR data (vBN of c-BN) were used to follow the formation of BN films by mass-selected B and N ion deposition.57 Raman data were used to characterise BN single-walled nanotubes (SWNT), formed by substitution from SWCNT by B203/N2 treatment.58 Assignments for such species were made using the results of DFT and ab initio calculations.59 61... 

By using the same type of 1,3-dipolar cyclo-addition of azomethine ylides it was possible to anchor ferrocene (Fc) onto the sidewalls of SWCNTs [96]. Accordingly, a nitrogen-functionalized glycine (R-NHCH2COOH, R= CH2CH2OCH2CH2OCH2CH2NHCO-FC) and paraformaldehyde were refluxed in dimethylformamide in the presence of SWCNTs. From differential scanning calorimetry the extent of functionalization was determined as approximately 1 Fc molecule per 100 carbon atoms of the SWNTs. 

Figure 8.6 The dip-coating deposition of C-SWCNT solutions on fluorine doped tin oxide (a) A schematic outline of the dip-coating procedure that was used to assemble carboxy-SWNTs. (b) FESEM image of carboxy-SWNTs deposited on to neat fluorine-tin-oxide sample from acetonitrile solution by vertically dip-coating the neat fluorine-tin-oxide in carboxy-SWNT dispersion with a pulling speed of 0.05 mm min (the arrow indicates the pulling direction). Reproduced with permission from Valentini et al ...

Preparation of purified SWCNTs (p-SWNT) functionalized with arylsulfonic acid (SA-SWNT). A nanocomposite carbon material (PFA-SWNT) was prepared by grafting PFA to a SWCNT. Pyrolysis of the PFA-SWCNT produced a nancmorous carbon nanocomposite (NPC/SWNT). Adapted from Yi et al " ... 

Baker et al. [95] were the first to report the formation of DNA-SWCNT adducts in solution for DNA hybridization. The DNA-SWCNT complexes were synthesized by reacting oxidized SWCNTs with thionyl chloride and ethylenediamine to form amine-terminated sites, shown in Fig. 14.16. The amines were further reacted with succinimidyl 4-(Af-maleimidomethyl)cyclohexane-l-carboxylate (SMCC) forming maleimide groups which reacted with thiol-modified DNA. To confirm covalent attachment and to test the accessibility of the DNA-modified SWNTs, hybridization studies were conducted using fluorescently labeled DNA oligonucleotide targets. Shortly thereafter, the use of carbodiimide-assisted coupling... 

Carbon single-walled nanotubes (SWCNTs or SWNTs) [308068-56-6] M 3652-3607, d 1.7-1.9g/ml. The... 

Fig. 1.5 PSA sensor response at -0.3 V and 3000 rpm for human serum samples and PSA standards in calf serum (ng mL labeled on curves, dashed lines). SWCNT forest immunosensors were incubated with 10 mL serum for 1.25 h followed by 10 pL 4 pmol mL anti-PSA-HRP in 2% BSA and 0.05% Tween-20 for 1.25 h a current after placing electrodes in buffer containing 1 mM hydroquinone mediator, then injecting H2O2 to 0.4 mM. Dashed lines are standards in calf serum solid lines are human serum samples b Correlations of SWNT immiinosensor results for human serum samples found by using direct comparison to a calilnation curve ( ) and by standard addition ( ) against results from ELISA determination (RSD 10%) Iot the same samples. Equations shown were found by linear regression. Reproduced with permission from [65], copyright American Chemical Society 2006.

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