Characterisation of a carbon nanotube random network conjugated by semiconductor nanoparticles with defined nanometre-scaled gaps

Utilising a biological material, a novel CNT nanostructure conjugated by semiconductor nanoparticles (NPs) was synthesised intended for electronics devices with unprecedented properties. A peptide aptamer that has an affinity for carbonaceous materials was fused to a cage-shaped protein (LiDps) to be displayed on its outer surface. As a potential coulomb island, semiconductor NPs were synthesised within the cavity of engineered protein (NHBP-LiDps). By the affinity of the peptide aptamer, the NHBP-LiDps proteins accommodating semiconductor NPs were adhered to surround the CNTs with nanometre-scaled gaps defined by the thickness of the protein cage. Using a dielectrophoresis assembly, the random network of CNTs conjugated by the NHBP-LiDps with NP cores was formed between a pair of electrodes. Electronic characterisation was performed on the random network of CNTs conjugated with NPs. Coulomb blockade was observed. When CNTs were dispatched between a pair of electrodes, ohmic characteristics were observed. Apparently, the direct contact between CNTs was avoided by the NHBP-LiDps proteins surrounding the CNTs. The results are the first steps towards revealing unique electronic properties of these CNT conjugates.