Determination of surface oxygen vacancy position in SnO2 nanocrystals by Raman spectroscopy

Liu, L.Z.; Wu, Xiaoqiang; Gao, Feng; Jin, Shangtai; Li, T.H.; Chu, Paul K.

doi:10.1016/j.ssc.2011.03.029

Cited by 102 publications

(61 citation statements)

References 25 publications

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“…The Raman spectroscopic technique was used to further confirm the phase composition of the catalysts modified by different amounts of lithium oxide, with the profiles being exhibited in Figure . For comparison, the spectroscopy of the individual SnO 2 was also collected, which shows three typical Raman spectroscopic peaks at 480, 635, and 775 cm –1 , corresponding to the E g , A 1g , and B 2g vibrational modes, respectively . While Sn9Li1 displays the same profile as pure SnO 2 , starting from Sn7Li3, the typical Raman spectroscopic peaks belonging to Li 2 SnO 3 are observed at 588, 370, and 320 cm –1 , whose intensities increase with the increasing amount of lithium oxide.…”

Section: Resultsmentioning

confidence: 99%

SnO₂Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

Liang

Fang

et al. 2018

Eur J Inorg Chem

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To develop reactive catalysts for oxidative coupling of methane at low temperatures, different alkali-metal oxides are adopted in this study to modify the surface of SnO 2 . In comparison with the unmodified SnO 2 , the reaction performance of all of the modified catalysts can be significantly improved, among which lithium oxide shows the best promotional effects, and the optimal catalyst is achieved with a Sn/Li molar ratio of 5:5. With this catalyst, the highest C 2 product yield of 16 % is achieved at 750°C. The XPS and CO 2 -TPD results reveal that for those catalysts with evident enhanced OCM reaction performance, the coexistence of a suitable amount of surface alkaline and electrophilic oxygen sites is indispensable. Furthermore, with the catalysts modified by different amounts of lithium oxide, the C 2 yield at different temperatures is nearly [a

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Section: Resultsmentioning

confidence: 99%

SnO₂Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

Liang

Fang

et al. 2018

Eur J Inorg Chem

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“…This has been frequently reported, though not clearly assigned [22][23][24], to be caused by tin oxide with a low degree of crystallinity. As expected, our Raman spectra showed the ~530 cm -1 peak intensity was higher for the 300 μm-thick tin coating on silicon compared to 1 μm-thick tin coating.…”

Section: Resultsmentioning

confidence: 93%

“…2(b). SnO 2 with a tetragonal rutile crystalline structure has 4 Raman-active modes: A 1g (631-638 cm ) [19][20][21][22][23][24]. Among these, the A 1g peak can be used to analyze the degree of crystallinity of SnO 2 because its half angle width decreases and its intensity increases with increasing crystallinity [22][23][24].…”

Section: Resultsmentioning

confidence: 99%

Crystallization of Mesoporous Tin Oxide Prepared by Anodic Oxidation

Kim¹,

Shin²

2017

Journal of Electrochemical Science and Technology

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Crystallization of one-dimensional porous tin oxide during the anodic oxidation of tin at ambient temperatures is reported. Remarkable crystallinity is achieved when a substrate with a high elastic modulus (e.g., silicon) is used and the tin coating on it is very thin. It is suggested that the compressive stress applied to the anodic tin oxide during the anodization process is the key factor affecting the degree of crystallinity. The measured value of the stress generated during anodization matches well with the range of the most favorable theoretical pressure (stress) for crystallization.

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“…Supplementary bands appearing either in the regions of 350 cm –1 or 570 cm –1 have been cited. These bands have been linked to surface modes, oxygen vacancies or crystalline interface disorder . In our work, we cannot discuss any eventual bands related to SnO 2 in the 550–580 cm –1 region because the D 2 band of SiO 2 completely masks this part of the spectrum.…”

Section: Resultsmentioning

confidence: 99%

Controlled SnO₂ nanocrystal growth in SiO₂–SnO₂ glass‐ceramic monoliths

Tran

Bui

Turrell

et al. 2011

J Raman Spectroscopy

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Crack‐free (100–x) SiO2–x SnO2 glass‐ceramic monoliths have been prepared by the sol–gel method obtaining for the first time SnO2 concentrations of 20% with annealing at 1100 °C. Heat‐treatment resulted in the formation and growth of SnO2 nanocrystals within the silica matrices. Combined use of Fourier transform–Raman spectroscopy and in situ high‐temperature X‐Ray diffraction shows that SnO2 particles begin to crystallize in the cassiterite‐type phase at 80 °C and that their average apparent size remains around 7 nm, even after annealing at 1100 °C. Nanocrystal sizes and size distributions determined by low‐wavenumber Raman are in good agreement with those obtained from transmission electron microscopy measurements. Results indicate that the formation and the growth of SnO2 nanocrystals impose a residual porosity in the silica matrix. Copyright © 2011 John Wiley & Sons, Ltd.

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Determination of surface oxygen vacancy position in SnO2 nanocrystals by Raman spectroscopy

Cited by 102 publications

References 25 publications

SnO₂Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

SnO₂Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

Crystallization of Mesoporous Tin Oxide Prepared by Anodic Oxidation

Controlled SnO₂ nanocrystal growth in SiO₂–SnO₂ glass‐ceramic monoliths

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Determination of surface oxygen vacancy position in SnO2 nanocrystals by Raman spectroscopy

Cited by 102 publications

References 25 publications

SnO2Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

SnO2Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

Crystallization of Mesoporous Tin Oxide Prepared by Anodic Oxidation

Controlled SnO2 nanocrystal growth in SiO2–SnO2 glass‐ceramic monoliths

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Product

Resources

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SnO₂Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

SnO₂Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

Controlled SnO₂ nanocrystal growth in SiO₂–SnO₂ glass‐ceramic monoliths