The characterization of silicon nanowire modified surface with multiwall carbon nanotube (MWCNT) and chitosan (CS) for perfect attachment of ssDNA-probe

The study presents an investigation into the effect of chitosan-CNT modification of silicon nanowire on DNA binding chemistry for the perfect attachment of ssDNA adhesion. MWCNT were purified through refluxing in concentrated HNO3 (V/V, 1:1) mixture for 2 hours at 55°C mixture of MWCNT-chitosan solution was prepared first immobilized on the Si surface. The surface was characterized by UV-vis measurement, Scanning Electrons microscope (SEM) and Fourier transform infrared spectroscopy (FTIRs) and series of electrical test were conducted to investigate the effect of MWCNT-chitosan concentration on the performance of the surface binding chemistry with Si-wire and chitosan-CNT modified. The results showed that the chitosan-CNT modification produced good probe adhesion and improve electrical properties. the took the advantage of CNTs with -COOH groups on silicon nanowire dispersed among chitosan containing -NH2 groups due to the peptide bonds formed between -COOH and -NH2 and due nanowire large surface area-to-volume ratio promises high sensitivity. We have established reliable procedure for the functionalization and is tapproach will allow a variety of species to be sensed on nanowire device.