Variations in carbonyl mode intensities in inelastic electron tunneling and multiple reflection absorption infrared spectroscopy. Part III: effects due to surface coverage of adsorbates

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

“…The tunneling spectra of propionic acid 1,18,39,41,55 and other fatty acids 2,18,[53][54][55][56][57][58][59][60][61][62][63][64] were measured and reported. The tunneling spectra of myristic (C14), palmitic (C16), and stearic (C18) acid on alumina doped from benzene solutions (0.1 -1.0 mg/ml) are shown in Fig.…”

“…61 Templeton and Weinberg 62 reported that adsorbed nbutyrate anion is produced from the hydrogenolysis of cyclopropanecarboxylate anion on alumina by surface OH groups. Devdas and Mallik 64 measured the tunneling spectra and multiple-reflection absorption infrared (MRAIR) spectra of a series of aliphatic dicarboxylic acids (succinic, glutaric, adipic, and azelaic acid) on alumina. They concluded that although these aliphatic dicarboxylic acids are adsorbed as monocarboxylate anions on the surfaces, the νC=O peak of the COOH group in the tunneling spectra is attenuated by the presence of the Pb top electrode from a comparison of the MRAIR spectra.…”

“…They concluded that although these aliphatic dicarboxylic acids are adsorbed as monocarboxylate anions on the surfaces, the νC=O peak of the COOH group in the tunneling spectra is attenuated by the presence of the Pb top electrode from a comparison of the MRAIR spectra. 63,64 The tunneling spectra of benzoic acid 5,17,18,[25][26][27][66][67][68][69][70]83 and various related compounds [16][17][18]26,41,51,56,65,[69][70][71][72][73][74][75][76][77][78]80,81,83 were measured and reported. Benzoic acid is adsorbed as benzoate anion on alumina and magnesia, giving a good tunneling spectrum with strong and well-resolved peaks.…”

Inelastic Electron Tunneling Spectroscopy

“…29,30,62,102 Vibrational spectra were obtained using IETS and MRAIRS to study monolayers of pyruvic acid adsorbed on alumina incorporated in thin film Al/alumina/pyruvic acid/Pb samples. Spectra obtained using both techniques do not exhibit a carbonyl peak, however MRAIR spectra for similar samples without a Pb cover film do show the carbonyl stretch.…”

Interaction of functionalized Ga2O3 NW-based room temperature gas sensors with different hydrocarbons

“…Simple carboxylic acids, such as formic, acetic and valeric acids, adsorb strongly on different materials including oxides [3][4][5][6][7][8][9]. We have used this mechanism to functionalize Ga 2 O 3 nanowires (NWs), incorporated into gas sensing devices, with pyruvic acid (CH 3 (C O)CO 2 H, PA) by simple room-temperature vapor transport [10].…”