Infrared study of oxygen adsorption on impure zinc oxide

Smith, D. M.; Eischens, R. P.

doi:10.1016/0022-3697(67)90237-5

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…This situation does not prevail for oxygen adsorption on impure zinc oxide. 21 In this case the results could not be predicted and perhaps not even explained. This problem is illustrated in Figure 7 with a sample of zinc oxide containing carbon and nitrogen impurities (designated ZnO(C,N)).…”

Section: Carbon Monoxide On Platinummentioning

confidence: 82%

Infrared spectra of chemisorbed molecules

Eischens¹

1972

Acc. Chem. Res.

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That the areas of halomethylmercury chemistry discussed in this review developed in such breadth and depth so quickly is due to the dedicated, enthusiastic, and skillful efforts of my predoctoral and postdoctoral coworkers whose names are to be found in the references cited. I am grateful to the U. S. Air Force Office of Scientific Research, the U. S. Army Research Office {Durham), and the Alfred P. Sloan Foundation for the generous support which made this research possible.

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Section: Carbon Monoxide On Platinummentioning

confidence: 82%

Infrared spectra of chemisorbed molecules

Eischens¹

1972

Acc. Chem. Res.

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“…The authors [48] have shown that such CO 2 molecules are stable on the surface of defective ZnO powders even at elevated temperatures. Negative bands at 2205, 2006, and 1915 cm −1 indicate desorption of chemisorbed oxygen related to nitrogen impurities in zinc oxide produced during PVP decomposition [49]. Thus, it can be assumed that at 450 • C in a humid atmosphere, O 2 adsorbed on the surface of ZnO nanofibers is replaced by OH groups.…”

Section: Resultsmentioning

confidence: 99%

Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect

Platonov

Rumyantseva

Khmelevsky

et al. 2020

Sensors

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Variable air humidity affects the characteristics of semiconductor metal oxides, which complicates the reliable and reproducible determination of CO content in ambient air by resistive gas sensors. In this work, we determined the sensor properties of electrospun ZnO and ZnO/Pd nanofibers in the detection of CO in dry and humid air, and investigated the sensing mechanism. The microstructure of the samples, palladium content, and oxidation state, type, and concentration of surface groups were characterized using complementary techniques: X-ray fluorescent spectroscopy, XRD, high-resolution transmission electron microscopy (HRTEM), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy-dispersive X-ray (EDX) mapping, XPS, and FTIR spectroscopy. The sensor properties of ZnO and ZnO/Pd nanofibers were studied at 100–450 °C in the concentration range of 5–15 ppm CO in dry (RH25 = 0%) and humid (RH25 = 60%) air. It was found that under humid conditions, ZnO completely loses its sensitivity to CO, while ZnO/Pd retains a high sensor response. On the basis of in situ diffuse reflectance IR Fourier transform spectroscopy (DRIFTS) results, it was concluded that high sensor response of ZnO/Pd nanofibers in dry and humid air was due to the electronic sensitization effect, which was not influenced by humidity change.

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“…#036-1451) and Kadox ZnO, as obtained by burning Zn powders in oxygen [34], are shown in Figure 1. When compared to standard Zincite (PDF card No.…”

Section: Structure From Xrd Patterns and Ftir Bulk Modesmentioning

confidence: 99%

“…Concerning the systems that are investigated in this work, from the analysis of the FTIR spectra in the 800-1200 cm −1 range, Figure 2, the sharp bands due to multiphonon modes of Kadox ZnO, used as a reference, are compared to those of ZnO nanocages [34].…”

Section: Structure From Xrd Patterns and Ftir Bulk Modesmentioning

confidence: 99%

Zinc Oxide Nanostructures: From Chestnut Husk-Like Structures to Hollow Nanocages, Synthesis and Structure

et al. 2018

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Tailor-made nanostructured ZnO cages have been catalytically grown on Au and Pt films covering silicon substrates, by a controlled evaporation process, which means an accurate choice of temperatures, times, gas flows (He in the heating, He/air during the synthesis), and Au/Pt film thickness. The effect of the process parameters affecting the morphology and the structure of the obtained materials has been investigated by XRD analysis, scanning electron microscopy (SEM) and atomic force microscopy (AFM) microscopies, and FTIR spectroscopies. In particular, the role of the synthesis temperature in affecting the size and shape of the obtained ZnO cages has been highlighted. It will be shown that by adopting higher temperatures, the protruding nanowhiskers several microns in length, covering the cages and exhibiting both basal and prismatic faces, change into very thin and narrow structures, with extended prismatic faces, prevailing with respect to the basal ones. At an even higher process temperature, the building up of Au particles aggregates inside and/or anchored to the walls of the hollow cages, without any evidence of elongated ZnO nanostructures will be highlighted. From FTIR spectra information on lattice modes of the investigated ZnO, materials have been obtained.

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Infrared study of oxygen adsorption on impure zinc oxide

Cited by 9 publications

References 10 publications

Infrared spectra of chemisorbed molecules

Infrared spectra of chemisorbed molecules

Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect

Zinc Oxide Nanostructures: From Chestnut Husk-Like Structures to Hollow Nanocages, Synthesis and Structure

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