Surface Potential Switching by Metal Ion Complexation/Decomplexation Using Bipyridinethiolate Monolayers on Gold
| Autor: | Toshiaki Ohta, Shuji Abe, Wataru Mizutani, Ikuyo Nakai, Tohru Nakamura, Yukihiro Shimoi, Masatoshi Kanesato, Hiroshi Kondoh, Kiyomi Tsukagoshi, Hideo Tokuhisa, Takao Ishida, Emiko Koyama |
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| Rok vydání: | 2006 |
| Předmět: |
inorganic chemicals
Kelvin probe force microscope Chemical substance Chemistry Inorganic chemistry chemistry.chemical_element Chloride Surfaces Coatings and Films Metal Bipyridine chemistry.chemical_compound visual_art Monolayer Materials Chemistry medicine visual_art.visual_art_medium Physical and Theoretical Chemistry Derivative (chemistry) medicine.drug Palladium |
| Zdroj: | The Journal of Physical Chemistry B. 110:9195-9203 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp056821d |
| Popis: | Surface potential switching on gold(111) surfaces is induced by complexation/decomplexation reactions of a bipyridine (BP) derivative and palladium(II) chloride, as observed by Kelvin probe force microscopy (KFM). On the basis of the theoretical predictions, a 4-(5-phenylethynyl-2,2'-bipyridine-5'-yl-ethynyl)benzenethiol (PhBP) derivative was synthesized and used as an active monolayer to catch transition metal ions. By using the microcontact printing (CP) technique, micron-size patterned PhBP monolayers, which act as effective hosts to coordinate palladium(II) chloride, were prepared on gold(111) surfaces. The KFM signal decreases by complexation of the Pd(II) chloride in PhBP monolayers and is recovered by removal of Pd ions using an ethylenediamine solution, as confirmed by X-ray photoelectron spectroscopy. This process is reversible, indicating that the surface potential switching is realized by complexation/decomplexation of Pd(II). A CP PhBP monolayer, when it detects the target palladium ion, shows sensitivity for the picomolar level detection judged from surface potential changes in KFM measurements. The dipole moment estimated by the surface potentials is much smaller than the calculated value, indicating that mechanisms for the reduction of the surface dipole moment exist in real monolayers prepared by the CP method. |
| Databáze: | OpenAIRE |
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