Polarization-specific adsorption of organic molecules on ferroelectric LiNbO3 surfaces

Zhengzheng Zhang, P. Sharma, C. N. Borca, P. A. Dowben, A. Gruverman

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Polarization effect on adsorption of d-cysteine molecules on ferroelectric LiNbO3 surfaces is studied by a combination of infrared spectramicroscopy and spatially resolved x-ray absorption near edge spectroscopy. It is shown that even in the absence of any electronic excitation (optical or thermal), the adsorption is still polarization-specific with preferential d-cysteine deposition occurring on positive domains. This observation rules out molecular adsorption solely due to pyroelectric or photoinduced charge and suggests possible dipole-dipole interaction between polar d-cysteine molecules and ferroelectric polarization dipoles. The surface chemistry related to polarization-dependent variations in Li/Nb concentration is also implicated as a contributing factor in the domain-specific adsorption of d-cysteine.

Original languageEnglish
Article number243702
Number of pages3
JournalApplied Physics Letters
Issue number24
Publication statusPublished - 13 Dec 2010
Externally publishedYes


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