Shape control of PbSe nanocrystals using noble metal seed particles.
We demonstrate that the shape of PbSe nanocrystals can be controlled systematically by seeding their growth with noble metal nanoparticles (Au, Ag, or Pd) and varying the seed and precursor concentrations. Cylinders (quantum rods), cubes, crosses, stars, and branched structures were produced in high yield at 150 degrees C in reaction times of a few minutes. Although their absorption spectrum does not exhibit sharp features, the quantum rods exhibit significant photogeneration efficiency, enabling infrared sensitization of a polymeric photoconductive nanocomposite.
Yong
Ken-Tye
KT
Institute for Lasers, Photonics and Biophotonics, The University at Buffalo, New York 14260-4200, USA.
Sahoo
Yudhisthira
Y
Choudhury
Kaushik Roy
KR
Swihart
Mark T
MT
Minter
John R
JR
Prasad
Paras N
PN
D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000379:methods; D006046:Gold / Q000737:chemistry*; D007259:Infrared Rays; D007854:Lead / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D008670:Metals / Q000737:chemistry; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods; D010316:Particle Size; D010777:Photochemistry / Q000379:methods; D018036:Selenium Compounds / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
D008670:Metals; D018036:Selenium Compounds; C088065:lead selenide; D007854:Lead; D012834:Silver; D006046:Gold