일 시 : 2011년 11월 24일, 오후 5:00
장 소 : 25-1동 국제회의실

-Abstract-
   In the first part of the talk, 3-dimensional self-assembly of two-segment nanowires composed of gold and polypyrrole will be introduced. We show actuating properties of the self-assembled two-segment nanowires and this actuation can be affected via humidity, temperature, and light. A model for predicting the effects of stimuli-induced contraction of the polypyrrole ends of two-segment gold-polypyrrole nanowires on their assembly into curved superstructures is presented. The model and experimental data presented here show that small changes (ca. 3%) in the diameter of the polypyrrole segment of each rod will induce dramatic changes (up to 20%) in the radii of the resulting superstructures, providing a convenient means for actuating their opening and closing. The potential applications of this actuation for new concept microcapsules will be discussed.
   In the second part of the talk, we describe two complementary methods that may be used to align nanowires on a substrate with moderately high degrees of precision over large areas using capillary and mechanical forces. Significantly, we show that these nanowires may be integrated into electronic devices and electrically addressed making them potentially useful for molecular electronic studies and applications.
   In the third part of the talk, we introduce a new method to fabricate molecular transport junctions (MTJs) where molecules of different lengths can bridge the gaps of gapped nanowires without having to match the length of the sacrificial metal segment to the length of the molecule during the fabrication of the nanowire. Moreover, the same sacrificial segment length can be used to create MTJs of molecular wires of different lengths, thereby overcoming a major challenge faced be researchers attempting to prepare MTJs with gapped nanowires.