Spontaneous buildup of surface potential with a thin film of a zwitterionic molecule giving noncentrosymmetric crystal structure

Spontaneous buildup of surface potential with a thin film of a zwitterionic molecule giving noncentrosymmetric crystal structure
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两性离子分子薄膜自发形成表面电势,形成非中心对称晶体结构

DOI:
10.1063/1.3254217
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发表时间:
2009
影响因子:
4
通讯作者:
N. Sato
N. Sato
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
J. Tsutsumi;H. Yoshida;R. Murdey;N. Sato

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用开尔文方法测量了两性离子分子、吡啶-1,3-二氢-1,3-二氧代-2H-吲哚-2-叶立德(PI或IPB)和两个氮取代衍生物的表面电势。在单晶中只观察到分子偶极矩单向取向的化合物的表面电势自发增强(5.5V,膜厚300 nm)。用掠入射X射线衍射、极图测量、原子力显微镜和开尔文探针力显微镜研究了薄膜中分子偶极矩的排列与测量的表面电位之间的关系。
Surface potentials were examined using the Kelvin method for thin films of zwitterionic molecules, pyridinium 1,3-dihydro-1,3-dioxo-2H-inden-2-ylide (PI or IPB) and two nitrogen-substituted derivatives. Spontaneous buildup of the surface potential on the film (5.5 V at a film thickness of 300 nm) was only observed for the compound with unidirectional orientation of the molecular dipole moments in the single crystal. The relationship between the alignment of the molecular dipole moments in the film and the measured surface potentials was investigated using grazing incidence x-ray diffraction, pole-figure measurements, atomic force microscopy, and Kelvin probe force microscopy.
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