Please use this identifier to cite or link to this item:
|Title:||In situ XPS studies of thermally deposited potassium on poly(p-phenylene vinylene) and its ring-substituted derivatives||Authors:||Li, S.
|Issue Date:||21-Sep-2001||Citation:||Li, S., Kang, E.T., Neoh, K.G., Ma, Z.H., Tan, K.L., Huang, W. (2001-09-21). In situ XPS studies of thermally deposited potassium on poly(p-phenylene vinylene) and its ring-substituted derivatives. Applied Surface Science 181 (3-4) : 201-210. ScholarBank@NUS Repository. https://doi.org/10.1016/S0169-4332(01)00397-X||Abstract:||The interactions of thermally evaporated potassium atoms with poly(p-phenylene vinylene) (PPV) and its soluble derivative, poly(2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene) (MEH-PPV) was studied in situ by angle-resolved X-ray photoelectron spectroscopy (XPS). The changes in the C 1s core-level line shape of the polymers, the evolution of the K 2p core-level spectra, and the changes in chemical compositions at the interface with progressive deposition of the metal atoms were carefully monitored. The interactions of the K atoms with the conjugated polymer surfaces were compared with those involving metals of other work functions. Diffusion of the K atoms into the polymers and distinct charge transfer interactions were observed at the interface. The migration of bulk adsorbed oxygen to the surfaces of both polymers during the K deposition process resulted in an increase in oxygen concentration at the K/polymer interfaces. The diffusion of the adsorbed oxygen from the bulk of the conjugated polymer film played a dominant role in the interfacial reactions. The interfacial layer contains mainly oxidized metal and metal-polymer charge transfer species. © 2001 Elsevier Science B.V. All rights reserved.||Source Title:||Applied Surface Science||URI:||http://scholarbank.nus.edu.sg/handle/10635/52661||ISSN:||01694332||DOI:||10.1016/S0169-4332(01)00397-X|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Oct 19, 2020
WEB OF SCIENCETM
checked on Oct 12, 2020
checked on Oct 24, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.