Characterization and electric field dependence of N,N′-bis(9H-fluoren-9-ylidene)benzene-1, 4-diamine thin film/substrate interface

• Published in: Surface and interface analysis Vol. 43; no. 6; pp. 954 - 958
• Main Authors: Xin, Hongliang, Li, Zhuomin, He, Tianxian, Deng, Wenli
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01-06-2011; Wiley
• Subjects: Computer aided manufacturing; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Contact angle; Cross-disciplinary physics: materials science; rheology; Deposition; electric field dependence; Electric fields; Electric potential; electrode-electrode distance; electron transfer; Exact sciences and technology; Ohmic; Physics; Separation; Thin films; Tunneling; Thin films; Benzene; Electric field effects; electric field dependence; Electron transfer; electrode-electrode distance; Organic compounds
• ISSN: 0142-2421; 1096-9918; 1096-9918
• DOI: 10.1002/sia.3670

N,N′‐bis(9H‐fluoren‐9‐ylidene)benzene‐1,4‐diamine deposited onto highly oriented pyrolytic graphite (HOPG) was investigated by contact angle measurement(CAM), Raman spectroscopy and tunneling spectroscopy. The results of CAM and Raman spectra have confirmed that organic layers had deposited on substrate. Tunneling spectra obtained in the scanning tunneling microscopy measurement system were reported as a function of electrode potential. The tunneling current data were acquired at different electrode–electrode separations and depicted significant trend under the action of electric field. Under weak electric fields, the electrode–electrode separation has little effect on the potential of conductance peak. However, with the shrinkage of electrode–electrode separation, the electron transport model obeys the Ohmic law. Copyright © 2010 John Wiley & Sons, Ltd.