title: Biological assembly of nanocircuit prototypes from protein-modified CdTe nanowires.
abstract: CdTe nanowires made by self-organization of CdTe nanoparticles in aqueous media were separately conjugated with complementary biological connectors, such as antigen-antibody and biotin-streptavidin. Transmission electron microscopy images and Forster resonance energy transfer measurements in nanowire superstructures with different diameters indicate that biological affinity of the attached proteins results in the formation of crossbar and end-to-side connections between the nanowires. A prototype of a logical circuit made from a triangular arrangement of the nanowires spontaneously assembled on a Si substrate was examined by conducting atomic force microscopy. While diode-like behavior was observed in the sides of the triangle, the nanowire junction points were found to be nonconductive. It was attributed to high tunneling barrier created by protein molecules wedged between the nanowires. Suggestions are made how to reduce it or use the insulating gap between the nanowires as a framework for single-electron devices.
authors.affiliation: Department of Chemical Engineering 2300 Hayward, H. H. Dow Bldg, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Tang
authors.forename: Susheng
authors.initials: S
authors.lastname: Tan
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Kotov
mesh_terms: D000936:Antigen-Antibody Complex / Q000737:chemistry / Q000648:ultrastructure; D019187:Cadmium Compounds / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004581:Electronics; D008422:Materials Testing; D036103:Nanotechnology / Q000379:methods; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D011506:Proteins / Q000737:chemistry* / Q000648:ultrastructure*; D012666:Semiconductors; D013691:Tellurium / Q000737:chemistry*
chemical_list: D000936:Antigen-Antibody Complex; D019187:Cadmium Compounds; D020099:Coated Materials, Biocompatible; D011506:Proteins; D013691:Tellurium; C028337:cadmium telluride