XANES and XPS investigations of surface defects in wire-like SnO2 crystals

Chuvenkova, O. A.; Domashevskaya, É. P.; Ryabtsev, S. V.; Yurakov, Yu. A.; Popov, Alexey; Koyuda, D. A.; Nesterov, D. N.; Spirin, D. E.; Ovsyannikov, Ruslan; Turishchev, S. Yu.

doi:10.1134/s1063783415010072

Cited by 37 publications

(26 citation statements)

References 15 publications

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“…These values were also observed on natural oxides formed on pure metallic tin surfaces (486.6 and 530.5 eV) [38,47]. These results are also in good agreement with previously published information about VLS grown tin dioxide nanowires with well-developed surfaces and physico-chemical states [38]. High energy components are observed for the 1s line of oxygen in the range of 532.0–533.6 eV (Fig.…”

Section: Resultssupporting

confidence: 91%

“…The fine structure of the oxygen 1s level is considerably different for tin dioxide nanowires and for powder samples; this difference can be related to the contributions from the sorbed components. The O 1s component at 532 eV binding energy, prevailing on wire-like sample surfaces, was previously observed on metallic tin foil surfaces stored under laboratory conditions [38] and for magnetron sputtered tin nanolayers oxidized in air [47]. This component is also observed on the surfaces of nanopowder particles (see Fig.…”

Section: Resultssupporting

confidence: 56%

“…6). These components are usually caused by hydroxy groups and water molecules [38,47,50–51] adsorbed on the surfaces of the nanosized objects under study. The fine structure of the oxygen 1s level is considerably different for tin dioxide nanowires and for powder samples; this difference can be related to the contributions from the sorbed components.…”

Section: Resultsmentioning

confidence: 99%

“…From the analysis of the spectra fine structure, we can conclude that the wire-like sample is closer to the reference spectrum with a more pronounced Sn M 4,5 absorption edge fine structure. Also, more noticeable is the "vacancy" feature at ≈487.5 eV observed in SnO 2 nanowires, which is usually connected with the presence of oxygen vacancies [35,37–38]. The decrease in the half-widths and the increase in the relative intensity of the peaks for each of the features observed around 490 eV (main absorption edge of the SnO 2 ) provides evidence for a more ordered structure in VLS grown single crystals of SnO 2 nanowires than in calcinated and partially disoriented particles in powder samples.…”

Section: Resultsmentioning

confidence: 99%

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Gas sensing properties of individual SnO₂ nanowires and SnO₂ sol–gel nanocomposites

Shaposhnik¹,

Shaposhnik²,

Turishchev³

et al. 2019

Beilstein J. Nanotechnol.

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This work is an investigation of the properties of semiconductor materials based on metal oxides, their catalytic properties, and their application as gas sensors, which were shown to exhibit high sensitivity, stability, and selectivity to target gases. The aim of this work is the comparison of gas sensing properties of tin dioxide in the form of individual nanowires and nanopowders obtained by sol–gel synthesis. This comparison is necessary because the traditional synthesis procedures of small particle, metal oxide materials seem to be approaching their limit. Because of this, there is increasing interest in the fabrication of functional materials based on nanowires, i.e., quasi-one-dimensional objects. In this work, nanocrystalline tin dioxide samples with different morphology were synthesized. The gas-transport method was used for the fabrication of well-faceted wire-like crystals with diameters ranging between 15–100 nm. The sol–gel method allowed us to obtain fragile gels from powders with grain sizes of about 5 nm. By means of X-ray photoelectron spectroscopy (XPS) it was proven that the nanowires contain considerably smaller amounts of hydroxy groups compared to the nanopowders. This leads to a decrease in the parasitic sensitivity of the sensing materials to humidity. In addition, we demonstrated that the nanowires are characterized by a nearly single-crystalline structure, ensuring higher stability of the sensor response due to the unlikelihood of sample recrystallization. The results from the ammonia detection experiments showed that the ratio of the sensor response to the surface area exhibits similar values for both the individual nanowire and nanopowders-based sensor materials.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Gas sensing properties of individual SnO₂ nanowires and SnO₂ sol–gel nanocomposites

Shaposhnik¹,

Shaposhnik²,

Turishchev³

et al. 2019

Beilstein J. Nanotechnol.

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“…Only in the case of bimetallic modified sample AuPd/SnO 2 is it slightly shifted to 531.3 eV, indicating a kind of stronger electronic interaction between the noble metal and metal oxide components, than in case of monometallic modified samples. The other component (532.8 eV) is usually attributed to various surface oxygen species, originating from ambient oxygen chemisorption and dissociation [28]. This component again is shifted (532.7 eV) in case of bimetallic loaded sample, which corresponds to modified chemical environment for surface-related oxygen species.…”

Section: Resultsmentioning

confidence: 99%

Effect of AuPd Bimetal Sensitization on Gas Sensing Performance of Nanocrystalline SnO2 Obtained by Single Step Flame Spray Pyrolysis

et al. 2019

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Improvement of sensitivity, lower detection limits, stability and reproducibility of semiconductor metal oxide gas sensor characteristics are required for their application in the fields of ecological monitoring, industrial safety, public security, express medical diagnostics, etc. Facile and scalable single step flame spray pyrolysis (FSP) synthesis of bimetal AuPd sensitized nanocrystalline SnO2 is reported. The materials chemical composition, structure and morphology has been studied by XRD, XPS, HAADFSTEM, BET, ICP-MS techniques. Thermo-programmed reduction with hydrogen (TPR-H2) has been used for materials chemical reactivity characterization. Superior gas sensor response of bimetallic modified SnO2 towards wide concentration range of reducing (CO, CH4, C3H8, H2S, NH3) and oxidizing (NO2) gases compared to pure and monometallic modified SnO2 is reported for dry and humid gas detection conditions. The combination of facilitated oxygen molecule spillover on gold particles and electronic effect of Fermi level control by reoxidizing Pd-PdO clusters on SnO2 surface is proposed to give rise to the observed enhanced gas sensor performance.

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Optimizing Surface Composition and Structure of FeWO₄ Photoanodes for Enhanced Water Photooxidation

Nguyen

Bui

et al. 2023

Adv Materials Technologies

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Photoelectrochemical water splitting is a promising approach to produce green hydrogen using solar energy. A primary bottleneck remains the lack of efficient photoanodes to catalyze the sluggish water photooxidation reaction. Engineering photoabsorbers with a narrow bandgap and suitable band edge can boost the photoelectrochemical performance. Herein, nanostructured iron tungstate (FeWO4) photoanodes are engineered directly on a fluorine doped tin oxide glass substrate via a scalable and ultra‐fast flame synthesis route in 13 seconds. Physiochemical, optoelectronic, and electrochemical properties of these photoanodes are systematically investigated. The key roles of charge transport, transfer, and dissolution of W and Fe ions from the FeWO4 matrix within long‐term performance are revealed. Optimal FeWO4 photoanode with a bandgap of 1.82 eV and a FeOOH/NiOOH co‐catalyst coating shows an improved water photooxidation performance, reaching a photocurrent density of 0.23 mA cm−2 at 1.4 V versus reversible hydrogen electrode in 1 m potassium hydroxide. It further demonstrates relatively good photostability, maintaining ≈96% of photocurrent density after 1‐hour continuous photooxidation, albeit some trace of Fe, W and Ni elements dissolution. Insights on the photooxidation performance of nanostructured FeWO4 provide promising directions for the engineering of small band‐gap catalysts for a variety of photoelectrochemical applications.

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XANES and XPS investigations of surface defects in wire-like SnO2 crystals

Cited by 37 publications

References 15 publications

Gas sensing properties of individual SnO₂ nanowires and SnO₂ sol–gel nanocomposites

Gas sensing properties of individual SnO₂ nanowires and SnO₂ sol–gel nanocomposites

Effect of AuPd Bimetal Sensitization on Gas Sensing Performance of Nanocrystalline SnO2 Obtained by Single Step Flame Spray Pyrolysis

Optimizing Surface Composition and Structure of FeWO₄ Photoanodes for Enhanced Water Photooxidation

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XANES and XPS investigations of surface defects in wire-like SnO2 crystals

Cited by 37 publications

References 15 publications

Gas sensing properties of individual SnO2 nanowires and SnO2 sol–gel nanocomposites

Gas sensing properties of individual SnO2 nanowires and SnO2 sol–gel nanocomposites

Effect of AuPd Bimetal Sensitization on Gas Sensing Performance of Nanocrystalline SnO2 Obtained by Single Step Flame Spray Pyrolysis

Optimizing Surface Composition and Structure of FeWO4 Photoanodes for Enhanced Water Photooxidation

Contact Info

Product

Resources

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Gas sensing properties of individual SnO₂ nanowires and SnO₂ sol–gel nanocomposites

Gas sensing properties of individual SnO₂ nanowires and SnO₂ sol–gel nanocomposites

Optimizing Surface Composition and Structure of FeWO₄ Photoanodes for Enhanced Water Photooxidation