Structural and electrical properties of TiO2/ZnO core–shell nanoparticles synthesized by hydrothermal method

Vlăzan, Paulina; Ursu, Daniel; Irina-Moisescu, C.; Miron, I.; Sfîrloagă, Paula; Rusu, E.

doi:10.1016/j.matchar.2015.01.017

Cited by 54 publications

(28 citation statements)

References 25 publications

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Section: Characteristics Of the Synthesized Photocatalystssupporting

confidence: 90%

“…The results obtained from TEM analysis are consistent with the literature (Pérez-González et al 2017;Vlazan et al 2015). Vlazan et al (2015) also obtained a TiO 2 -ZnO oxide system via a hydrothermal method; the TEM images of the obtained powders showed individual particles of nanometric size (> 50 nm). The observed sintering effect produced by the calcination process is well described in the literature (Chen et al 2015;Konyar et al 2012;Luo and Zhang (2015); Nie et al 2015).…”

Section: Characteristics Of the Synthesized Photocatalystssupporting

confidence: 90%

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Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

et al. 2019

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A TiO 2 -ZnO binary oxide system (with molar ratio TiO 2 :ZnO = 8:2) was synthesized by a hydrothermal method, assisted by calcination at temperatures of 500, 600 and 700 °C, using zinc citrate as the precursor of ZnO. The morphology (SEM, TEM), crystalline structure (XRD, Raman spectroscopy), diffuse reflectance spectra (DRS), chemical surface composition (EDXRF), porous structure parameters (low-temperature N 2 sorption) and characteristic functional groups (FT-IR) of the TiO 2 -ZnO oxide materials were comprehensively analyzed. The novelty of this work is the observation of the coexistence of the crystalline structures of anatase and ZnTiO 3 in TiO 2 -ZnO oxide materials. Moreover, it is shown that the obtained materials absorb visible radiation. The key stage of the study was the evaluation of the photocatalytic activity of the TiO 2 -ZnO binary oxide systems in the degradation of model organic pollutants: C.I. Basic Red 1, C.I. Basic Violet 10, C.I. Basic Blue 3 and 4-nitrophenol. For all synthesized materials, a high efficiency of degradation of the model organic impurities was demonstrated. The results show that the synthesized products may be materials of interest for use in the degradation of organic pollutants. Moreover, the kinetics of the photocatalytic degradation of selected organic compounds were determined based on the Langmuir-Hinshelwood equation, assuming a pseudo-first-order (PFO) reaction.

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Section: Characteristics Of the Synthesized Photocatalystssupporting

confidence: 90%

Section: Characteristics Of the Synthesized Photocatalystssupporting

confidence: 90%

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

et al. 2019

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“…The layer-by-layer structure of TiO 2 -ZrO 2 bilayered photoanode exhibit moderate surface area compared with the pristine bulk materials positive sign for amount of dye adsorption and also leads to the shortened collection length for charges results into increasing efficiency [41]. The values of surface area measure by BET technique for all the samples are summarized in Table 2 and found to be in accordance with the previously reported results [42].…”

Section: Surface Morphology and Elemental Analysissupporting

confidence: 87%

Layer-by-layer deposition of TiO2–ZrO2 electrode sensitized with Pandan leaves: natural dye-sensitized solar cell

Pawar

Baviskar

Inamuddin

et al. 2019

Mater Renew Sustain Energy

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TiO 2 , ZrO 2 and layer-by-layer TiO 2-ZrO 2 films were prepared by doctor blade method followed by sensitization with natural dye for dye-sensitized solar cell application. The structural and optical, morphological and compositional properties were investigated by X-ray diffraction and UV-Vis spectroscopy, scanning electron microscopy, BET, surface profilometer and energy-dispersive X-ray analyzer, respectively. Dye-sensitized solar cells were fabricated using the prepared electrodes of TiO 2 , ZrO 2 and layer-by-layer TiO 2-ZrO 2 films sensitized with natural dye extracted from Pandan leaves (Pandanus amaryllifolius). The J-V characteristics were recorded to measure photo-response of fabricated devices and electrochemical impedance spectroscopy to study the electron behavior, series resistance and lifetime. Photovoltaic parameter like shortcircuit current, open-circuit voltage, fill factor, and power conversion efficiency were evaluated for fabricated solar cell under artificial light supplied from white LED (15 mW·cm −2). The average values of power conversion efficiency of DSSCs fabricated with TiO 2 , ZrO 2 and layer-by-layer TiO 2-ZrO 2 photoanodes were found to be 0.65%, 3.04% and 3.13%, respectively.

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“…This linear response of the composite in this range with increasing humidity may be attributed to the following probabilities: (i) At low RH mobility of TiO 2 ions in the composite is restricted due to curling up of polymer chains. As humidity increases, polymer chain uncurls and becomes aligned by absorbing water molecules paving way for faster hopping of charge carriers, resulting in increased sensing response of the composite [21,35]. (ii) Porosity of the polymers as revealed by SEM studies may facilitate absorption of water molecules as RH increases causing a decrease in the impedance of the composite [13].…”

Section: Humidity Sensing Response Studiesmentioning

confidence: 99%

“…In this work, we have attempted to fabricate a low cost humidity sensing device made of PANI-TiO 2 composite which can be easily prepared and operable at room temperature. We preferred TiO 2 with PANI for the composite because it is a white n-type transition metal oxide semiconductor with a wide band gap (3.0 -3.2 eV) and has a large dielectric constant (∼100) [21,22]. This compound's compatible physical properties were considered favorable for use in fiber optics, photovoltaics, gas sensors, biocompatible materials, electrolytic capacitors and dye sensitized solar cells [21].…”

Section: Introductionmentioning

confidence: 99%

Polyaniline-Titanium dioxide composite as humidity sensor at room temperature

Kotresh¹,

Ravikiran²,

Raj³

et al. 2016

Nanosystems: Phys. Chem. Math.

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In the present work, Polyaniline (PANI) and Polyaniline-Titanium dioxide (PANI-TiO 2 ) composite have been synthesized separately by chemical polymerization of aniline without/with TiO 2 . Characteristic absorption bands of PANI and TiO 2 in the composite were confirmed by FT-IR studies, indicating the interaction of PANI with TiO 2 . Comparative study of XRD patterns of PANI and the composite confirmed superficial deposition of PANI on TiO 2 and the average size of the composite particle was found to be 25 nm. The aggregated granular porous morphology of the composite was confirmed by its SEM image. The composite's sensing response to humidity at room temperature was tested and was found to be 84.21 % in the range 25 % -95 % RH. The response and recovery time of the composite at 95 % RH were measured to be 60s and 100s respectively and its sensing stability over a period of one month was also confirmed.

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Structural and electrical properties of TiO2/ZnO core–shell nanoparticles synthesized by hydrothermal method

Cited by 54 publications

References 25 publications

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Layer-by-layer deposition of TiO2–ZrO2 electrode sensitized with Pandan leaves: natural dye-sensitized solar cell

Polyaniline-Titanium dioxide composite as humidity sensor at room temperature

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