Formation of ionic bonds between a fatty-acid Langmuir-Blodgett monolayer and a zinc oxide substrate.
A fatty-acid Langmuir-Blodgett (LB) monolayer ionically adsorbed to the substrate has been prepared by adopting ZnO-based conductor and pure water respectively as the substrate and subphase. Ionization of the fatty-acid molecules has been detected by infrared reflection-absorption spectroscopy (IR-RAS), which is enabled by the condensed free electrons in the doped ZnO substrate. On the contrary, IR-RAS measurements have indicated that fatty-acid molecules transferred onto Au and indium-tin-oxide substrates from a pure-water surface are not ionized. In addition, it has been demonstrated that these ionically bonded fatty-acid monolayers protect the ZnO transparent electrode from chemical attack by NH(3) gas. Since the LB technique is a simple method applicable to a wide variety of materials, the present results may lead to a new way of obtaining functional organic-inorganic nanosystems.
Ikegami
Keiichi
K
Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central-2, 1-1-1 Umezono, Tsukuba 305-8568, Japan. k.ikegami@aist.go.jp
Sugimoto
Takashi
T
Yoshiyama
Takashi
T
Maejima
Keigou
K
Shibata
Hajime
H
Tampo
Hitoshi
H
Niki
Shigeru
S
D000327:Adsorption; D005227:Fatty Acids / Q000737:chemistry*; D007477:Ions / Q000138:chemical synthesis / Q000737:chemistry; D008567:Membranes, Artificial; D010316:Particle Size; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry*
D005227:Fatty Acids; D007477:Ions; D008567:Membranes, Artificial; D015034:Zinc Oxide