Structural, morphological and optical properties of SnO2 nanoparticles obtained by a proteic sol–gel method and their application in dye-sensitized solar cells

Pereira, Maurício de Sousa; Lima, Francisco; Silva, C. B.; Freire, Paulo; Vasconcelos, Igor F.

doi:10.1007/s10971-017-4488-7

Cited by 24 publications

(12 citation statements)

References 29 publications

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“…SnO 2 nanostructure preparation can be achieved using several different techniques. These include the co-precipitation [ 26 ], sol-gel [ 28 , 29 ], solvothermal decomposition [ 30 , 31 ], microwave hydrothermal synthesis [ 32 , 33 ] and precipitation [ 34 ], techniques, as well as hydrothermal synthesis [ 35 , 36 ], and the polyol [ 37 ], solvothermal [ 38 ], and by microwave [ 39 , 40 , 41 ] methods. However, issues related to the complexity of the synthetic process, including the creation of effluent by-product, reagent toxicity, and longer reaction times, have made industrial SnO 2 nanopowder generation difficult to achieve, with the creation of a pure powder product having been entirely unachievable through the aforementioned techniques [ 42 ].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…CoFe 2 O 4 NPs were produced by a proteic sol-gel method 34 following an experimental procedure described elsewhere 35,36 . Commercial Fe(NO 3 ) 3 9H 2 O (Sigma-Aldrich, 98%, 404 g/mol ) and Co(NO 3 ) 2 6H 2 O (Sigma-Aldrich, 98%, 291.03 g/mol) powders were used as metal precursors and comercial gelatin from bovine skin (Type B, Sigma-Aldrich) was used as organic precursor.…”

Section: Synthesis Of Cofe 2 O 4 Nanoparticlesmentioning

confidence: 99%

Flexible, Large-Area Organic Solar Cells With Improved Performance Through Incorporation of CoFe2O4 Nanoparticles in the Active Layer

Pereira

Lima²,

Almeida

et al. 2019

Mat. Res.

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Cobalt ferrite (CoFe 2 O 4) nanoparticles (NPs), with an average diameter of about 4-10 nm, were produced by the proteic sol-gel method and successfully doped into the active layer of poly(3-hexylthiophene-2,5diyl) (P3HT):[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) organic solar cells. Pristine and CoFe 2 O 4 NPs-doped blends of P3HT:PCBM were dispersed in a mixture of o-xylene:tetralin (1 mg/mL) based non-halogenated solvents and deposited via a semi-industrial blade coating process on flexible substrates to fabricate large area (0.55 cm 2), flexible organic solar cells with inverted configuration. The main focus of this study aims to assess the influence of NPs on the efficiency, stability and lifetime of the produced devices. From the photovoltaic parameters it was observed that the optimization of the bulk-heterojunction through the incorporation of CoFe 2 O 4 NPs resulted in increased short-circuit current density. As a result, the power conversion efficiency of doped devices increased by 10 % when compared with the undoped reference devices. Tests of lifetime and stability were performed using International Summit on OPV Stability (ISOS) protocols ISOS-D-3, ISOS-O-1 and ISOS-L-1. For the duration of the tests (1200 h), the results showed that doped cells presented performances at least comparable with those of reference cells.

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“…The SnO 2 unit cell comprises four O 2– ions and two Sn 4+ ions. Each Sn 4+ ion is enclosed by six O 2– ions residing in the corners of the octahedron, and O 2– ions are enclosed by three Sn 4+ ions occupying the three equilateral triangle corners . SnO 2 has turned out to be one of the finest materials in the class of transparent conducting oxides.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a SnO₂-Based Hydroelectric Cell for Green Energy Production

Gaur

Kumar

et al. 2020

ACS Omega

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The generation of electricity by dissociating water into H 3 O + and OH − ions through a hydroelectric cell (HEC) without liberating any toxic waste has achieved a groundbreaking feat. Nanoporous magnesium-doped SnO 2 and cobalt-doped SnO 2 materials have been prepared via a novel sol−gel method. The X-ray diffraction patterns of Mg-doped SnO 2 and Co-doped SnO 2 completely match with those of pure SnO 2 , which confirms the interstitial substitution of Mg and Co in the pristine SnO 2 . The results shown by Brunauer−Emmett−Teller theory curves illustrate the surface area of Mg-doped SnO 2 and Co-doped SnO 2 to be 46.22 and 46.81 m 2 /g, respectively, with their pore radii being ∼3 nm. The synthesized nanoparticles were pressed into square pellets of area 4.08 cm 2 . A zinc electrode was pasted on one side of each pellet and silver was painted on the other side to develop the HECs. The fabricated HECs of Mg-doped SnO 2 and Co-doped SnO 2 with 4.08 cm 2 area deliver short-circuit current, open-circuit voltage, and off-load output power of 41.69 mA, 0.787 V, and 32.81 mW and 77.52 mA, 0.454 V, and 35.19 mW, respectively. Cyclic voltammetry of both materials exhibited cathodic and anodic peaks in relation to the redox reactions taking place at Zn and silver electrodes. Nyquist curves of both HECs in the wet state confirm the ionic diffusion of split H 3 O + and OH − ions as compared to the dry state. An off-load output power of 35.19 mW delivered by the HEC of Co-doped SnO 2 with 4.08 cm 2 area is quite promising and has great potential to replace other green energy sources.

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Structural, morphological and optical properties of SnO2 nanoparticles obtained by a proteic sol–gel method and their application in dye-sensitized solar cells

Cited by 24 publications

References 29 publications

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

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

Flexible, Large-Area Organic Solar Cells With Improved Performance Through Incorporation of CoFe2O4 Nanoparticles in the Active Layer

Fabrication of a SnO₂-Based Hydroelectric Cell for Green Energy Production

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Structural, morphological and optical properties of SnO2 nanoparticles obtained by a proteic sol–gel method and their application in dye-sensitized solar cells

Cited by 24 publications

References 29 publications

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

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

Flexible, Large-Area Organic Solar Cells With Improved Performance Through Incorporation of CoFe2O4 Nanoparticles in the Active Layer

Fabrication of a SnO2-Based Hydroelectric Cell for Green Energy Production

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Fabrication of a SnO₂-Based Hydroelectric Cell for Green Energy Production