Abstract
A facile technique was demonstrated for the controlled assembly and alignment ofmulti-segment nanowires using bioengineered polypeptides. An elastin-like-polypeptide(ELP)-based biopolymer consisting of a hexahistine cluster at each end(His6-ELP-His6) was generated and purified by taking advantage of the reversiblephase transition property of ELP. The affinity between theHis6 domain of biopolymers and the nickel segment of multi-segment nickel/gold/nickelnanowires was exploited for the directed assembly of nanowires onto peptide-functionalizedelectrode surfaces. The presence of the ferromagnetic nickel segments on the nanowiresallowed the control of directionality by an external magnetic field. Using this method, thedirected assembly and positioning of multi-segment nanowires across two microfabricatednickel electrodes in a controlled manner was accomplished with the expected ohmiccontact.
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