Characterization of Metal Oxide Surfaces and Thin Semiconductor Films by Inelastic Electron Tunneling Spectroscopy

Adsorption State and Morphology of Anthraquinone-2-carboxylic Acid Deposited from Solution onto the Atomically-Smooth Native Oxide Surface of Al(111) Films Studied by Infrared Reflection Absorption Spectroscopy, X-ray Photoelectron Spectroscopy, and Atomic Force Microscopy

“…IETS has shown that carboxylic acids react with the surface OH groups of alumina to give the adsorbed carboxylate anions on the Lewis-acid sites (Al + ) of the surfaces. 25,26 It has been clarified in the present study that AQ-2-COOH deposited from solutions with concentrations lower than or equal to 0.02 mg ml -1 also reacts with the surface OH groups of alumina to give monolayers of symmetrically adsorbed carboxylate anions on the surface, as shown in Fig. 3.…”

“…3. 25,26 The absence of hydroquinone on the alumina surfaces is confirmed by a lack of peaks attributed to the νC-OH in both the IRAS spectra and tunneling spectra. 36 When the concentration of the solution is higher than 0.05 mg ml -1 , the peak attributed to the νC=O for the carboxylic acid becomes strong, while the peak of the νsCOO -gradually disappears.…”

Anthraquinone-2-carboxylic Acid Deposited from Solution onto Native Oxide Surfaces of Al Films Characterized by Inelastic Electron Tunneling Spectroscopy, X-ray Photoelectron Spectroscopy, and Atomic Force Microscopy

“…[1][2][3] The high sensitivity and resolution as well as the wide spectral range enable us to obtain a detailed vibrational spectrum of adsorbed species on the oxide surface of the metal electrode. Aluminum is widely used as the metal electrode because of chemical, physical, and electric stability of the oxide.…”

“…Aluminum is widely used as the metal electrode because of chemical, physical, and electric stability of the oxide. [1][2][3] Thus, IETS is a powerful surface analytical technique and has been used in many fields of chemistry. [1][2][3] In the present letter, we report the tunneling spectra of AQ-2-COOH on the oxide surfaces of Al films for the first time.…”

“…[1][2][3] Thus, IETS is a powerful surface analytical technique and has been used in many fields of chemistry. [1][2][3] In the present letter, we report the tunneling spectra of AQ-2-COOH on the oxide surfaces of Al films for the first time. The tunneling spectra were compared with the vibrational spectra of AQ-2-COOH on Ag 4,5 and Au 6 by reflection absorption infrared spectroscopy (RAIR).…”