Surface states in template synthesized tin oxide nanoparticles

Cabot, Andreu; Arbiol, Jordi; Ferré, R.; Morante, J.R.; Chen, Fanglin; Liu, Meilin

doi:10.1063/1.1639946

Cited by 24 publications

(10 citation statements)

References 16 publications

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“…7. To know the exact value of the band gap of the nanoparticles, the reflectance values were altered to absorbance by means of the KubelkaMunk function [19].…”

Section: Resultsmentioning

confidence: 99%

Sonochemical-driven ultrafast facile synthesis of SnO2 nanoparticles: Growth mechanism structural electrical and hydrogen gas sensing properties

Ullah

Khan

Yamani

et al. 2017

Ultrasonics Sonochemistry

115

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Synthesis of SnO nanoparticles have been successfully accomplished moderately at lower temperature by facile, rapid, efficient and mild ultrasonic irradiation method. The as-grown SnO nanoparticles are investigated by various characterization techniques in terms of structural, optical, electrical and gas sensing properties. XRD investigation has shown that the SnO nanoparticles materials exhibit single rutile crystal phase with high crystallinity. FESEM studies showed uniform and monodisperse morphology of SnO nanoparticles. The chemical composition of SnO was systematically studied by EDX measurements. Additional confirmation of three Raman shifts (432, 630, 772cm) indicated the characteristic properties of the rutile phase of the as-grown SnO nanoparticles. The optical properties of SnO nanoparticles were examined by DRS, and the electronic band gap of SnO nanoparticles were around 3.6eV. Electrical properties of the SnO nanoparticles measured at various temperatures have shown the semiconducting properties. Surface area and pore size of synthesized nanoparticles were analyzed from BET. It has been revealed that SnO nanoparticles have surface area is 47.8574m/g and the pore size is 10.5nm. Moreover, hydrogen gas sensor made of SnO nanoparticles showed good sensitivity and faster response for the hydrogen gas. This method is template-less and surfactant-free which circumvents rigorous reaction work-up for the former removal, reaction temperature and reaction time compared to hydrothermal synthesis and pertinent to many other oxide materials.

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“…7. To know the exact value of the band gap of the nanoparticles, the reflectance values were altered to absorbance by means of the KubelkaMunk function [19].…”

Section: Resultsmentioning

confidence: 99%

Sonochemical-driven ultrafast facile synthesis of SnO2 nanoparticles: Growth mechanism structural electrical and hydrogen gas sensing properties

Ullah

Khan

Yamani

et al. 2017

Ultrasonics Sonochemistry

115

View full text Add to dashboard Cite

show abstract

“…The most citied [6,9,10,14,[52][53][54][107][108][109][110][111][112][113][114] paper on the EPR study of oxygen interaction with SnO 2 (by Chang) [88] has, for a long time, been thought to give evidence proving the transformation of charged molecular-to charged atomic-oxygen on SnO 2 . To our surprise, it was shown in 1982 and 1983 by Che and Tench [21,22] that Chang's conclusions are inconsistent with the rest of the EPR studies, and appear to be due a misinterpretation of EPR results.…”

Section: Temperature Programmed Desorptionmentioning

confidence: 99%

Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

2006

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Tin dioxide is the most commonly used material in commercial gas sensors based on semiconducting metal oxides. Despite intensive efforts, the mechanism responsible for gas-sensing effects on SnO(2) is not fully understood. The key step is the understanding of the electronic response of SnO(2) in the presence of background oxygen. For a long time, oxygen interaction with SnO(2) has been treated within the framework of the "ionosorption theory". The adsorbed oxygen species have been regarded as free oxygen ions electrostatically stabilized on the surface (with no local chemical bond formation). A contradiction, however, arises when connecting this scenario to spectroscopic findings. Despite trying for a long time, there has not been any convincing spectroscopic evidence for "ionosorbed" oxygen species. Neither superoxide ions O(2)(-), nor charged atomic oxygen O,(-) nor peroxide ions O(2)(2-) have been observed on SnO(2) under the real working conditions of sensors. Moreover, several findings show that the superoxide ion does not undergo transformations into charged atomic oxygen at the surface, and represents a dead-end form of low-temperature oxygen adsorption on reduced metal oxide.

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“…According to previous experimental and computational results for the PL of SnO 2 nanowires, − the PL mechanisms are strongly related to surface defects such as oxygen vacancies. There are two types of oxygen sites at the surface (Scheme ); oxygen atoms aligned along the out-of-plane direction are called bridging oxygen (Ov_Bridge), and those in the in-plane direction of the nanowire are called in-plane oxygen (Ov_Inplane).…”

Section: Resultsmentioning

confidence: 80%

Role of Oxygen Vacancy Sites on the Temperature-Dependent Photoluminescence of SnO₂ Nanowires

et al. 2021

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The role of oxygen vacancies in temperature-dependent photoluminescence of SnO2 nanowires was investigated by X-ray absorption spectroscopy. Two types of oxygen vacancies are present in the nanowires: at out-of-plane sites and at in-plane sites; both play crucial roles in the temperature dependence of the photoluminescence. Oxygen vacancies at in-plane sites participate in photon emission at low temperature, whereas those at out-of-plane sites result in photoluminescence at room temperature. Accordingly, the luminescence color changes from orange (630 nm, 1.93 eV) to green (515 nm, 2.4 eV) at 100 K. The color change is accompanied with a notable change in the oxygen K-edge X-ray absorption spectra. The scanning transmission X-ray microscopy results indicate that more oxygen vacancies at in-plane sites are present in the surface region than in the bulk region, whereas more oxygen vacancies at out-of-plane sites are present in the bulk region than in the surface region. Overall, the results demonstrate that oxygen-vacancy-mediated fluorescence properties of SnO2 nanowires are temperature-dependent; i.e., the photoluminescence mechanisms of the nanowires are mediated by oxygen vacancies at different sites, and the bicolor fluorescence originates from charge transfer between the states.

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Surface states in template synthesized tin oxide nanoparticles

Cited by 24 publications

References 16 publications

Sonochemical-driven ultrafast facile synthesis of SnO2 nanoparticles: Growth mechanism structural electrical and hydrogen gas sensing properties

Sonochemical-driven ultrafast facile synthesis of SnO2 nanoparticles: Growth mechanism structural electrical and hydrogen gas sensing properties

Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

Role of Oxygen Vacancy Sites on the Temperature-Dependent Photoluminescence of SnO₂ Nanowires

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Surface states in template synthesized tin oxide nanoparticles

Cited by 24 publications

References 16 publications

Sonochemical-driven ultrafast facile synthesis of SnO2 nanoparticles: Growth mechanism structural electrical and hydrogen gas sensing properties

Sonochemical-driven ultrafast facile synthesis of SnO2 nanoparticles: Growth mechanism structural electrical and hydrogen gas sensing properties

Interplay between O2 and SnO2: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

Role of Oxygen Vacancy Sites on the Temperature-Dependent Photoluminescence of SnO2 Nanowires

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Interplay between O₂ and SnO₂: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen

Role of Oxygen Vacancy Sites on the Temperature-Dependent Photoluminescence of SnO₂ Nanowires