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https://doi.org/10.1002/chem.201100807
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 polyfluorene polymers rewritable memory |
Issue Date: | 5-Sep-2011 | Citation: | 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. https://doi.org/10.1002/chem.201100807 | 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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/82781 | ISSN: | 09476539 | DOI: | 10.1002/chem.201100807 |
Appears in Collections: | Staff Publications |
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