Adsorption and reaction of nitromethane (CH3NO2) on Pt(111)

Saliba, Najat A.; Wang, Jiang; Bansenauer, Barbara A.; Koel, Bruce E.

doi:10.1016/s0039-6028(97)00406-8

Cited by 17 publications

(16 citation statements)

References 35 publications

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“…On the gold surface the TPD spectra shows one single peak due to desorption of CH 3 NO 2 and no other peaks associated with the other smaller molecules referred above were observed [16]. Nitromethane is proposed to adsorb on these metal surfaces in a monodentate geometry, with only one oxygen atom approaching the surface and the C-N axis tilted away from the normal to the surface and the adsorption energy is predicted to be close to 10 kcal/mol [15,16].…”

Section: Introductionmentioning

confidence: 86%

“…Only but a few studies concerning the adsorption of nitromethane on transition metal surfaces can be found in the literature [12][13][14][15][16][17]. Namely, there are several studies concerning the interaction of the simplest nitroalkane with the Ni(111) [12], Rh(111) [13], Pt(111) [14,15] and Au(111) [16] singlemetal surfaces and also with the Pt-Sn alloy [17].…”

Section: Introductionmentioning

confidence: 99%

“…Namely, there are several studies concerning the interaction of the simplest nitroalkane with the Ni(111) [12], Rh(111) [13], Pt(111) [14,15] and Au(111) [16] singlemetal surfaces and also with the Pt-Sn alloy [17]. From these experimental studies it is concluded that nitromethane is weakly adsorbed and that it desorbs in large quantities upon heating.…”

Section: Introductionmentioning

confidence: 99%

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The Adsorption of Nitromethane on the Au (111) Surface

Gomes

Illas

2001

IJMS

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Abstract:The density functional theory (DFT) based hybrid-method B3LYP has been used to study the interaction of the nitromethane molecule (CH 3 NO 2 ) with the Au(111) surface.The perfect Au(111) surface has been represented by a rather large cluster model, Au 22 , that was in turn used to extract information about the preferred adsorption geometry of the CH 3 NO 2 species. In order to extract energetic information about the stability of adsorbed nitromethane, calculations were also performed for the gas-phase CH 3 NO 2 molecule. The results obtained here are used to interpret experimental data. The computed geometry for adsorbed CH 3 NO 2 agrees with the structure proposed from a previous experimental work.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Adsorption of Nitromethane on the Au (111) Surface

Gomes

Illas

2001

IJMS

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“…The ∆R p of BPA shows two small unique peaks at around -0.1 V and 0 to 0.7 V (broad). They are supposed be induced by O-Pt bond formation (3,28) and the weak π orbital overlap between the aromatic ring and the Pt surface, respectively (see Fig. 4(a)).…”

Section: Sam Effects For Bpa Detectionmentioning

confidence: 99%

Enhanced Sensor Capability of Juxtaposed β-Cyclodextrin Rings in TiO2 Ultrathin Matrix as Determined by Cyclic Surface-Polarization Impedance Measurement

2008

Sensors and Materials

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The present study was focused on the sensitive detection of organic substances by electrochemical impedance spectroscopy (EIS), i.e., cyclic surface-polarization impedance (cSPI) measurement that detects the difference in interactions between the electrode and chemicals in aqueous phase. For cSPI measurement, Pt electrodes were modified with three different types of self-assembled monolayer (SAM) of-OH,-COOH, and-pyridine (Py) terminal groups. Among them, the Pt/SAM-OH electrode was additionally modified with an ultrathin TiO 2 gel layer and a 2:1 complex of β-cyclodextrin (β-CD) and bisphenol A (BPA), and then the BPA moiety was removed by washing in methanol. A highly sensitive and selective detection of BPA was achieved by the synergic effect of molecular imprinting and host-guest interaction in the ultrathin TiO 2 layer. The resulting BPA-imprinted TiO 2 /β-CD film showed a linear increase in ∆R p at-0.1 V for BPA of 2×10-8 to 2×10-6 M. However, BPA was barely detected on the SAM-modified electrodes at low concentrations, although their sensor responses were markedly enhanced at a concentration of 2×10-6 M, compared with that of the bare Pt electrode. The current approach suggests the simple concept and use of sensor films for the sensitive detection of various organic molecules including environmental pollutants.

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“…It is supposed to bring about N Pt or O Pt bonds formation, because there are potential dependencies for adsorptions of nitro compounds [21,22]. As to X p that varies symmetrically to R p in general, the difference between presence and absence of nitro group is more obvious than R p especially between −0.2 and 0 V, where the gentle decrement is observed only in the case of nitro compounds.…”

Section: Responses To Aromatic Nitro Compounds With Bare Ptmentioning

confidence: 99%