Structural evolution of SnO2 nanostructure from core–shell faceted pyramids to nanorods and its gas-sensing properties

Das, Soumen; Kim, Dae-Young; Choi, C. S.; Hahn, Yoon‐Bong

doi:10.1016/j.jcrysgro.2010.10.151

Cited by 20 publications

(6 citation statements)

References 51 publications

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“…The Sn 3d region of the XPS spectra for the SnO 2 NRs ( Fig. 4a ) exhibited Sn 3d 5/2 and Sn 3d 3/2 doublets for binding energies of ~486.3 and ~494.7 eV, respectively, confirming the presence of the Sn 4+ oxidation state 46 47 . In addition, the good symmetry of the peaks, showing no sub-components, suggests the absence of Sn 2+ .…”

Section: Resultsmentioning

confidence: 78%

“…The O 1s core level (Fig. 4b), in contrast, indicates the presence of two components, with the main peak at ~531 eV, assigned to the lattice oxygen, and a shoulder at ~532.5 eV, which is assigned to contamination (organic fragments) on the samples in light of the lack of additional structures on the Sn 3d core level46. Both WDX and XPS analysis showed no evidence of chlorine contamination and similar tin contents (anal.…”

Section: Resultsmentioning

confidence: 91%

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Aerosol assisted chemical vapour deposition of gas sensitive SnO2 and Au-functionalised SnO2 nanorods via a non-catalysed vapour solid (VS) mechanism

Vallejos

Selina

Annanouch

et al. 2016

Sci Rep

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Tin oxide nanorods (NRs) are vapour synthesised at relatively lower temperatures than previously reported and without the need for substrate pre-treatment, via a vapour-solid mechanism enabled using an aerosol-assisted chemical vapour deposition method. Results demonstrate that the growth of SnO2 NRs is promoted by a compression of the nucleation rate parallel to the substrate and a decrease of the energy barrier for growth perpendicular to the substrate, which are controlled via the deposition conditions. This method provides both single-step formation of the SnO2 NRs and their integration with silicon micromachined platforms, but also allows for in-situ functionalization of the NRs with gold nanoparticles via co-deposition with a gold precursor. The functional properties are demonstrated for gas sensing, with microsensors using functionalised NRs demonstrating enhanced sensing properties towards H2 compared to those based on non-functionalised NRs.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 91%

Aerosol assisted chemical vapour deposition of gas sensitive SnO2 and Au-functionalised SnO2 nanorods via a non-catalysed vapour solid (VS) mechanism

Vallejos

Selina

Annanouch

et al. 2016

Sci Rep

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“…The binding energies of 529.7 eV and 531.1 eV for two forms of oxygen (Fig. 7c) were shown by the deconvoluted O 1s spectrum, which was seen to be related within cassiterite [68], [69]. These outcomes are evidence of the pure nature of oxidation states of the nanoparticle elements.…”

Section: ) Compositional Analysismentioning

confidence: 81%

The Effect of PVP Concentration on Particle Size, Morphological and Optical Properties of Cassiterite Nanoparticles

et al. 2020

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Different concentrations of polyvinylpyrrolidone (PVP) have been successfully employed to prepare high purity tetragonal cassiterite nanoparticles, and control the growth of particle size. The effect of PVP on the structural, morphological, size, composition, and optical properties of the prepared cassiterite nanoparticles has been investigated. It has been found that various characteristics of tetragonal cassiterite nanoparticles could be optimized by simply changing the values of PVP. The pure tetragonal cassiterite nanoparticles have been produced at the optimum calcination temperature. The XRD and SEM results indicated the structural and morphological properties of the tetragonal cassiterite nanoparticles, respectively. The particles' size and their distribution have been displayed by TEM images. The composition phase and the surface composition of the prepared samples have been evaluated via FTIR and XPS, respectively. The optical properties of the prepared tetragonal cassiterite nanoparticles have been studied using UV-vis and PL spectroscopy. Outcomes cassiterite nanoparticles are useful for antibacterial activity and application of solar energy. INDEX TERMS Cassiterite nanoparticles, polyvinylpyrrolidone, thermal treatment technique, energy applications.

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“…The binding energies of 487.8 eV for Sn 3d 5/2 peak and 494.9 eV for the Sn 3d 3/2 peak are in line with the results presented in earlier research [ 19 , 27 , 69 ]. The deconvoluted O 1s spectrum demonstrates binding energies of 529.7 eV and 531.1 eV for two forms of oxygen ( Figure 7 c), which have been found to be correlated with SnO 2 [ 70 , 71 ]. The results appear to verify the purity of the nanoparticle elements’ oxidation states.…”

Section: Resultsmentioning

confidence: 99%

Thermal Calcination-Based Production of SnO2 Nanopowder: An Analysis of SnO2 Nanoparticle Characteristics and Antibacterial Activities

et al. 2018

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SnO2 nanoparticle production using thermal treatment with tin(II) chloride dihydrate and polyvinylpyrrolidone capping agent precursor materials for calcination was investigated. Samples were analyzed using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), diffuse UV-vis reflectance spectra, photoluminescence (PL) spectra and the electron spin resonance (ESR). XRD analysis found tetragonal crystalline structures in the SnO2 nanoparticles generated through calcination. EDX and FT-IR spectroscopy phase analysis verified the derivation of the Sn and O in the SnO2 nanoparticle samples from the precursor materials. An average nanoparticle size of 4–15.5 nm was achieved by increasing calcination temperature from 500 °C to 800 °C, as confirmed through TEM. The valence state and surface composition of the resulting nanoparticle were analyzed using XPS. Diffuse UV-vis reflectance spectra were used to evaluate the optical energy gap using the Kubelka-Munk equation. Greater calcination temperature resulted in the energy band gap falling from 3.90 eV to 3.64 eV. PL spectra indicated a positive relationship between particle size and photoluminescence. Magnetic features were investigated through ESR, which revealed the presence of unpaired electrons. The magnetic field resonance decreases along with an increase of the g-factor value as the calcination temperature increased from 500 °C to 800 °C. Finally, Escherichia coli ATCC 25922 Gram (–ve) and Bacillus subtilis UPMC 1175 Gram (+ve) were used for in vitro evaluation of the tin oxide nanoparticle’s antibacterial activity. This work indicated that the zone of inhibition of 22 mm has good antibacterial activity toward the Gram-positive B. subtilis UPMC 1175.

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Structural evolution of SnO2 nanostructure from core–shell faceted pyramids to nanorods and its gas-sensing properties

Cited by 20 publications

References 51 publications

Aerosol assisted chemical vapour deposition of gas sensitive SnO2 and Au-functionalised SnO2 nanorods via a non-catalysed vapour solid (VS) mechanism

Aerosol assisted chemical vapour deposition of gas sensitive SnO2 and Au-functionalised SnO2 nanorods via a non-catalysed vapour solid (VS) mechanism

The Effect of PVP Concentration on Particle Size, Morphological and Optical Properties of Cassiterite Nanoparticles

Thermal Calcination-Based Production of SnO2 Nanopowder: An Analysis of SnO2 Nanoparticle Characteristics and Antibacterial Activities

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