tailieunhanh - Báo cáo hóa học: " Strategies for Controlled Placement of Nanoscale Building Blocks"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Strategies for Controlled Placement of Nanoscale Building Blocks | Nanoscale Res Lett 2007 2 519-545 DOI s11671-007-9091-3 NANO REVIEW Strategies for Controlled Placement of Nanoscale Building Blocks Seong Jin Koh Received 2 June 2007 Accepted 20 August 2007 Published online 9 October 2007 to the authors 2007 Abstract The capability of placing individual nanoscale building blocks on exact substrate locations in a controlled manner is one of the key requirements to realize future electronic optical and magnetic devices and sensors that are composed of such blocks. This article reviews some important advances in the strategies for controlled placement of nanoscale building blocks. In particular we will overview template assisted placement that utilizes physical molecular or electrostatic templates DNA-pro-grammed assembly placement using dielectrophoresis approaches for non-close-packed assembly of spherical particles and recent development of focused placement schemes including electrostatic funneling focused placement via molecular gradient patterns electrodynamic focusing of charged aerosols and others. Keywords Placement Array Alignment Nanoscale building blocks Nanoparticle Nanocrystal Quantum dot Nanowire DNA Protein Carbon nanotube Template Electrostatic SAMs Dielectrophoresis Capillary force Growth Introduction There has been a lot of interest recently in fabricating electronic optical and magnetic devices sensors that are built on nanoscale building blocks such as nanoparticles nanowires carbon nanotubes DNA proteins etc. Over S. J. Koh H Department of Materials Science and Engineering The University of Texas at Arlington Arlington TX 76019 USA e-mail skoh@ the past decade very promising performances have been demonstrated at the single device level or in a collection of a few single units 1-14 . Despite these successes a major challenge remains for the individual functional units to be incorporated into practical devices and sensors they must be placed onto exact substrate locations so that they can be .