Deposition of CTAB-terminated nanorods on bacteria to form highly conducting hybrid systems.
Gold nanorods and nanospheres capped with positively charged CTAB are deposited on the surface of gram-positive bacterium having negatively charged teichoic acid brushes. The deposition rate is more than an order of magnitude faster than that for peptide and nucleic acid capped nanoparticles. For the nanorods, never been reported before, the strong electrostatic attraction causes the rods to bend conformally over the curved bacterium surface in random orientations. This leads to formation of an efficient percolating cluster (i.e., low contact resistance and high radius of gyration) with 104-fold higher current at 3-fold lower coverage compared to a monolayer from nanospheres. The high monolayer conductivity at only approximately 10% coverage for nanorods has potential for fabricating a novel class of bioelectronic devices by coupling electronic "nanocircuitry" at the surface to the biological function of microorganisms.
Berry
Vikas
V
University of Nebraska, Lincoln, Nebraska 68588-0643, USA.
Gole
Anand
A
Kundu
Subrata
S
Murphy
Catherine J
CJ
Saraf
Ravi F
RF
D001409:Bacillus cereus / Q000737:chemistry* / Q000378:metabolism; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry* / Q000378:metabolism; D004553:Electric Conductivity; D049329:Nanostructures / Q000382:microbiology*; D055672:Static Electricity; D013501:Surface-Active Agents / Q000737:chemistry* / Q000378:metabolism; D013682:Teichoic Acids / Q000737:chemistry / Q000378:metabolism
D002593:Cetrimonium Compounds; D013501:Surface-Active Agents; D013682:Teichoic Acids; D000077286:Cetrimonium