[19p-F210-1~16] 6.6 Probe Microscopy

[19p-F210-14] Frequency Modulation AFM Analysis of Fe₂O₃(0001) Surfaces in Solvents

〇Akira Sasahara¹, Takuya Ogura¹, Ryohei Kokawa², Shiho Moriguchi³, Teppei Tsujimoto⁴, Hiroshi Onishi¹ (1.Kobe Univ., 2.Shimadzu Co., 3.Shimadzu Techno-Research Inc., 4.JXTG Nippon Oil & Energy Co.)

Keywords:Iron oxide, FM-AFM

Iron (III) oxide (Fe₂O₃) (0001) surfaces were examined in water and oil by frequency-modulation atomic force microscopy (FM-AFM) technique. The Fe₂O₃(0001) surfaces were cleaned by annealing in air. The FM-AFM imaging in poly α-olefin (PAO), which is a representative lubricant oil, showed that the surfaces consisted of flat terraces separated by either monatomic or diatomic steps. The map of the frequency shift on the surface normal plane, which corresponds to distribution of atomic force at the Fe₂O₃-PAO interface, showed checkerboard-like patterns. The periodic contrast of the frequency shift indicates periodic distribution of the PAO molecules at the interface. The cause of the periodic distribution is discussed on the basis of the nanostructures of the Fe₂O₃(0001) surface. The hydration layers formed on the Fe₂O₃(0001) surfaces will be also reported.