Carbon nanotube–hydroxyapatite–hemoglobin nanocomposites with high bioelectrocatalytic activity

A simple and rapid method to graft hydroxyapatite on carbon nanotubes

“…1a) displayed well resolved characteristic absorption bands of natural HA [26]. The bands at 565 cm −1 and 604 cm −1 were attributed to P-O bending of phosphate group and the band at 1034 cm −1 was assigned to O-P-O carbonate ions of hydroxyl sites [14]. The bands at 3430 cm −1 and 1640 cm −1 were attributed to stretching and bending vibrations of hydroxyl (−OH) group.…”

“…Several methods have been reported for fabrication of CNTs-HA nanocomposites including self assembly [14], sol-gel [15], electrophoretic deposition [16], chemical precipitation [17], chemical vapor deposition (CVD) [18], spark plasma sintering (SPS) [19], freeze-granulation technique [20] etc. Xiao et al deposited the HA on poly (ethylene glycol) functionalized multiwalled carbon nanotubes using biomineralization method [21] and Lobo et al reported a method for the electrodeposition of hydroxyapatite films on superhydrophilic vertically aligned multiwalled carbon nanotubes [22].…”

A novel amperometric hydrogen peroxide biosensor based on immobilized Hb in Pluronic P123-nanographene platelets composite

“…3B). The k s of Hb confined in the P123-NGP film was evaluated to be 48.51 s −1 and was markedly higher than 1.72 s −1 for Hb/P123 modified electrode [27], 9.54 ± 0.88 s −1 for Hb/SA-MWCNTs electrode [36], and 5.05 ± 0.41 s −1 for Hb/MWCNTs-HA modified electrode [37]. This is because the NGP could act as the electron bridge or connector between the Hb molecules and the underlying electrode with a relatively large distance.…”

Biocomposites and hybrid biomaterials based on calcium orthophosphates

“…1083 Furthermore, calcium orthophosphate/carbon nanotube biocomposites might be immobilized by hemoglobin. 1084 Unfortunately, carbon nanotubes are very stable substances; they are neither bioresorbable nor biodegradable. Therefore, during in vivo bioresorption, the nanotubes will get into the human body from the biocomposite matrix and might cause uncertain health problems.…”