《68 Nano Lett. nl304435z》.pdf

Letter /NanoLett Design and Synthesis of Diverse Functional Kinked Nanowire Structures for Nanoelectronic Bioprobes Lin Xu,†,‡,§ Zhe Jiang,‡,§ Quan Qing,‡,§ Liqiang Mai,† Qingjie Zhang,† and Charles M. Lieber*,†,‡, ∥ †WUT-Harvard Joint Nano Key Laboratory, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China ‡Department of Chemistry and Chemical Biology and ∥School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States S *Supporting Information ABSTRACT: Functional kinked nanowires (KNWs) repre- sent a new class of nanowire building blocks, in which functional devices, for example, nanoscale field-effect tran- sistors (nanoFETs), are encoded in geometrically controlled nanowire superstructures during synthesis. The bottom-up control of both structure and function of KNWs enables construction of spatially isolated point-like nanoelectronic probes that are especially useful for monitoring biological systems where finely tuned feature size and structure are highly desired. Here we present three new types of functional KNWs including (1) the zero-degree KNW structures with two parallel heavily doped arms of U-shaped structures with a nanoFET at the tip of the “U”, (2) series multiplexed functional KNW integrating multi-nanoFETs along the arm and at the tips of V-shaped structures, and (3) parallel multiplexed KNWs integrating nanoFETs at the two tips of W-shaped structures. First, U-shaped KNWs were