Local photo-assisted poling of azo copolymer films by scanning probe microscopy

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題名:	Local photo-assisted poling of azo copolymer films by scanning probe microscopy
作者:	Chien, F.S.-S., Lin, C.Y., Hsu, C.C.
貢獻者:	Department of Physics, Tunghai University
關鍵詞:	AFM;Bound charge;Contact Electrification;Copolymer films;Electrical poling;Electrostatic force microscopy;Glass transition temperature;Non-linear optical material;Optical poling;Physical interactions;Polar chromophores;Polar orientation;Tapping modes
日期:	2008
上傳時間:	2013-05-21T09:16:02Z (UTC)
摘要:	Azo copolymers are nonlinear-optical materials, in which polar orientation can be induced by optical poling or electrical poling. We report a new efficient approach to performing photo-assisted poling (PAP) by atomic force microscopy (AFM) for azo copolymer films containing disperse-red-1 chromophores, and to characterize the polar orientation by electrostatic force microscopy (EFM) at the submicrometre scale. Both PAP and contact electrification effects can be generated by the physical interaction between the probes and the films. We demonstrated that these two effects can be distinguished by the relationship between the signs of the charges (bound charges and transferred charges) and the probe bias. Finally, we achieve local PAP far below the glass transition temperature by AFM operated in the tapping mode, and the response of the polar chromophores to local PAP can be studied by EFM. ? 2008 IOP Publishing Ltd.
關聯:	Journal of Physics D: Applied Physics 41 (23) , art. no. 235502
顯示於類別:	[應用物理學系所] 期刊論文

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