Growth of immobilized DNA by polymerase: bridging nanoelectrodes with   individual dsDNA molecules
  We present a method for controlled connection of gold electrodes with dsDNA molecules (locally on a chip) by utilizing polymerase to elongate single-stranded DNA primers attached to the electrodes. Thiol-modified oligonucleotides are directed and immobilized to nanoscale electrodes by means of dielectrophoretic trapping, and extended in a procedure mimicking PCR, finally forming a complete dsDNA molecule bridging the gap between the electrodes. The technique opens up opportunities for building from the bottom-up, for detection and sensing applications, and also for molecular electronics. 
Veikko Linko, Jenni Leppiniemi, Boxuan Shen, Einari Niskanen, Vesa P.   Hyt\"onen, J. Jussi Toppari
physics.bio-ph cond-mat.other cond-mat.soft