The deposition of organic molecules on gold nanoantennas is reported through chemisorption for sensing in the midinfrared (mid-IR) spectral range. The specific nanostructures are gold asymmetric-split ring resonators (A-SRRs) based on circular-geometry with two different ‘arc’ lengths. The plasmonic resonant coupling technique was used to match the vibrational responses of the targeted molecule...

Oxygen molecules do not adsorb on flat gold surfaces at room temperature, but recent experimental results have demonstrated adsorption of oxygen on small, negatively charged gold nanoparticles. Here we report first-principles density functional calculations of oxygen adsorption on neutral and charged Aun nanoparticles. We find that: (i) Oxygen molecules chemisorb on Aun clusters, with typical b...

The chemical properties of single-atomic chains of gold atoms are investigated using density functional calculations. The nanochains are shown to be unusually chemically active with strong chemisorption of oxygen atoms and carbon monoxide. The chemisorption energies vary significantly with the strain/stress conditions for the chain. Oxygen atoms are found to energetically prefer to get incorpor...

Recent theoretical progress in gas-surface reaction dynamics, a field relevant to heterogeneous catalysis, is described. One of the most fundamental reactions, the dissociative chemisorption of H2 on metal surfaces, can now be treated accurately using quantum mechanics. Density functional theory is used to compute the molecule-surface interaction, and the motion of the hydrogen atoms is simulat...

The nanoparticles of templated crosslinked chitosan, was prepared through using ECH as a crosslinker. The nanoparticles exhibited significantly higher adsorption capacities from the congo red dye than other adsorbent formed without a crosslinker. The adsorption of the dyes on the nanoparticles was affected by the initial pH, dye concentration, and temperature. The results were in accordance wit...

Auger electron spectroscopy is used to follow the initial chemisorption of oxygen on a Si(lOO)-2 x 1 surface. Careful measurements of the Si L,sVV spectra reveal, for the first time, fine structure in the region between 80 and 85 eV. For the clean Si(100) surface a peak at 81 eV has been found. Oxygen chemisorption on the Si(100) surface is associated with the appearance of a new well defined p...

Using scanning tunneling microscopy and temperature programmed desorption we investigate the Pt(110) surface under strongly oxidizing conditions involving either high-pressure O2 or atomic oxygen exposure. At low temperatures, only disordered Pt oxide structures are observed. After annealing ordered surface oxide islands are observed to coexist with a highly stable reconstructed (12x2)-O chemis...

The nature of some of the carbon–oxygen complexes formed after chemisorption of O2, CO2 and H2O on carbonaceous surfaces was determined. The analysis was done by means of density functional theories. Among the three reactions studied, CO2 chemisorption is the less exothermic. The nature of carbon–oxygen complexes depends on the oxidant agents. However, surface transformations of those complexes...

x-ray photoelectron and high resolution electron energy loss spectroscopic (xps-hreels) studies have shown that the adsorption of carbon dioxide at mg(100) surfaces at 80k is followed by a dissociative reaction leading to the formation of a metastable surface carbonate above 80k. the formation of a carbonate species is proposed to proceed through oxidation of c0 (g) by an active oxygen surface ...

acid extract of solanum tuberosum was tested as corrosion inhibitor for mild steel in 1 m hcl and h2so4 media using different techniques: weight loss (in different temperatures viz., 303, 313 and 323 k), potentiodynamic polarization, electrochemical impedance spectroscopy (eis) and sem techniques. the studies reveal that the plant extract act as good inhibitors in both the acid media and better...