Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 3, Issue 9, Pages 2033-2039Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc02087a
Keywords
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Funding
- Chinese Natural Science Foundation [21176164, 21206102, 21476152, 21336005]
- NSF of Jiangsu Province [BE2013052]
- Suzhou Nano-project [ZXG2012023]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20113201130003, 20123201120005]
- National Excellent Doctoral Dissertation funds [201455]
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Three symmetrical conjugated small molecules derived from phenothiazine (PTZ), PTZ-CN, PTZO-CN and PTZDO-CN, were designed and successfully synthesized for multilevel memory data storage. By reserving the terminal electron-accepting cyano moiety, the sulphur atom in phenothiazine (PTZ) was adjusted to different oxidation states, such as sulfide, sulfoxide, and sulfone, to tune the electron-accepting ability (J. Liu et al., Chem. Mater., 2008, 20, 4499). Therefore, a differentiated trap depth was achieved between the central sulphur-containing group and the terminal cyano groups when the molecules were charged. Devices based on PTZO-CN exhibited excellent ternary memory behaviour, while those based on PTZ-CN or PTZDO-CN only showed binary memory characteristics. Therefore, it is a viable approach to easily obtain multilevel memory organic materials by adjusting the difference between two electron-withdrawing groups in the conjugated molecular backbone through gradual oxidation of the central sulphur atom to achieve ternary memory performance.
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