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Title: Nonvolatile rewritable memory effects in graphene oxide functionalized by conjugated polymer containing fluorene and carbazole units
Authors: Zhang, B.
Liu, Y.-L.
Chen, Y.
Neoh, K.-G. 
Li, Y.-X.
Zhu, C.-X. 
Tok, E.-S. 
Kang, E.-T. 
Keywords: graphene oxide
molecular devices
rewritable memory
Issue Date: 5-Sep-2011
Source: Zhang, B., Liu, Y.-L., Chen, Y., Neoh, K.-G., Li, Y.-X., Zhu, C.-X., Tok, E.-S., Kang, E.-T. (2011-09-05). Nonvolatile rewritable memory effects in graphene oxide functionalized by conjugated polymer containing fluorene and carbazole units. Chemistry - A European Journal 17 (37) : 10304-10311. ScholarBank@NUS Repository.
Abstract: A new polymer, poly[{9,9-di(triphenylamine)fluorene}(9,9-dihexylfluorene) (4-aminophenylcarbazole)] (PFCz) was synthesized and used in a reaction with graphene oxide (GO) containing surface-bonded acyl chloride moieties to give a soluble GO-based polymer material GO-PFCz. A bistable electrical switching effect was observed in an electronic device in which the GO-PFCz film was sandwiched between indium-tin oxide (ITO) and Al electrodes. This device exhibited two accessible conductivity states, that is, a low-conductivity (OFF) state and a high-conductivity (ON) state, and can be switched to the ON state under a negative electrical sweep; it can also be reset to the initial OFF state by a reverse (positive) electrical sweep. The ON state is nonvolatile and can withstand a constant voltage stress of -1 V for 3 h and 108 read cycles at -1 V under ambient conditions. The nonvolatile nature of the ON state and the ability to write, read, and erase the electrical states, fulfill the functionality of a rewritable memory. The mechanism associated with the memory effects was elucidated from molecular simulation results and in-situ photoluminescence spectra of the GO-PFCz film under different electrical biases. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Chemistry - A European Journal
ISSN: 09476539
DOI: 10.1002/chem.201100807
Appears in Collections:Staff Publications

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