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Solution‐Based Phototransformation of C 60 Nanorods: Towards Improved Electronic Devices
Author(s) -
Barzegar Hamid Reza,
Larsen Christian,
Edman Ludvig,
Wågberg Thomas
Publication year - 2013
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201300016
Subject(s) - nanorod , materials science , monomer , polymer , electron mobility , precipitation , dispersion (optics) , nanotechnology , chemical engineering , analytical chemistry (journal) , optoelectronics , chemistry , optics , organic chemistry , composite material , physics , engineering , meteorology
A modified liquid–liquid interface precipitation synthesis of C 60 nanorods, effects and opportunities following an in situ photochemical transformation in the liquid state, and an electronic characterization using a field‐effect transistor (FET) geometry are reported. The nanorods feature a high aspect ratio of ≈10 3 and a notably small average diameter of 172 nm. Interestingly, it is found that a decreased nanorod diameter appears to correlate with distinctly improved electronic properties, and an average electron mobility of 0.30 cm 2 V −1 s −1 , as measured in a FET geometry, is reported for as‐grown nanorods, with the peak value being an impressive 1.0 cm 2 V −1 s −1 . A photoexposure using green laser light ( λ = 532 nm) is demonstrated to result in the formation of a polymer‐C 60 shell encapsulating a monomer‐C 60 bulk; such photo‐transformed nanorods exhibit an electron mobility of 4.7 × 10 −3 cm 2 V −1 s −1 . It is notable that the utilized FET geometry only probes the polymer‐C 60 nanorod surface shell, and that the monomer‐C 60 bulk is anticipated to exhibit a higher mobility. Importantly, photoexposed nanorods can be conveniently processed as a stabile dispersion in common hydrophobic solvents, and this finding is attributed to the insoluble character of the polymer‐C 60 shell.