Structural, optical and charge transport study of rutile TiO2 nanocrystals at two calcination temperatures

Maurya, Archana; Chauhan, Pratima; Mishra, Sheo K.; Srivastava, Rajneesh

doi:10.1016/j.jallcom.2011.05.108

Cited by 116 publications

(57 citation statements)

References 66 publications

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“…Examples include the use of TiO 2 in white pigments and in sunscreens, the latter because of the high refractive index (n = 2.7) which allows rapid absorption of ultraviolet radiation. The photocatalytic activity of TiO 2 means that it can be used to produce easy-toclean surfaces, for air/water purification, deodorization, and sterilization [4][5][6][7][8]. These multiple applications mean that environmental distribution is inevitable.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO2 nanoparticles in the earthworm reproduction test

Schlich

Terytze²,

Hund‐Rinke

2012

Environ Sci Eur

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Background: The increasing use of nanotechnology means that nanomaterials will enter the environment. Ecotoxicological data are therefore required so that adequate risk assessments can be carried out. In this study, we used a standardized earthworm reproduction test with Eisenia andrei to evaluate three types of TiO 2 nanoparticles (NM-101, NM-102, NM-103). The test was performed in natural sandy soil (RefeSol 01A) following Organisation for Economic Co-operation and Development Test Guideline No. 222. The nanoparticles differed in several aspects, such as crystalline structure, size, and the presence or absence of a coating. Results: Uncoated nanoparticles stimulated earthworm reproduction in a concentration-dependent manner during winter testing, increasing the number of offspring by up to 50% compared to the control. However, there was no stimulation when the same test was performed in the summer. This reflected an underlying circannual rhythm observed in the control soil, characterized by the production of a significantly larger number of juveniles in summer compared with that in winter. The effect of the uncoated TiO 2 nanoparticles was to reduce or eliminate the circannual differences by increasing the reproductive rate in winter. Coated TiO 2 nanoparticles did not influence earthworm reproduction. Conclusion: TiO 2 appears to affect earthworm reproductive activity by abolishing the circannual rhythm that depresses reproduction in the winter. Further experiments will be necessary to determine (1) the mode of action of the nanoparticles, (2) the important parameters causing the effect (e.g., relevant soil parameters), and (3) the environmental relevance of continuous earthworm reproduction we observed under laboratory conditions.

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Section: Introductionmentioning

confidence: 99%

Effect of TiO2 nanoparticles in the earthworm reproduction test

Schlich

Terytze²,

Hund‐Rinke

2012

Environ Sci Eur

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“…The negative slope in W-H plot indicated the presence of compressive strain [24], whereas the positive slope indicated the presence of tensile strain [25]. The sample density, ρ, from X-ray data was calculated by [26,27]:…”

Section: Methodsmentioning

confidence: 99%

“…For anatase phase n is four and for rutile phase n is two [20,28]. Further, the specific surface area, S a , was calculated by [27]:…”

Section: Methodsmentioning

confidence: 99%

Influence of precursor type on structural, morphological, dielectric and magnetic properties of TiO2 nanoparticles

Singh¹,

Mukherjee

Ghosh

et al. 2017

Cerâmica

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TiO 2 nanoparticles (NPs) were synthesized by sol-gel methods using two different precursors, titanium tetraisopropoxide and potassium titanium oxalate (KTO). The precursors had a profound influence on the structural, morphological, dielectric and magnetic properties of synthesized TiO 2 NPs, as evidenced by the XRD, FE-SEM, TEM, LCR and VSM studies in the synthesized samples. Alkoxide-derived TiO 2 NPs contained mostly mixed phases of anatase and rutile, whereas KTO-derived TiO 2 NPs contained anatase and Magnéli phases (Ti n O 2n-1 ). After heat treatment at 550 °C, the crystallite size of KTO-derived NPs was lower than alkoxide-derived TiO 2 NPs. The synthesized nanoparticles were spherical and agglomerated having anatase and rutile phases with different proportions in the microstructure of the alkoxide sample. Dielectric constant of the KTO-derived NPs was higher than the alkoxide-derived NPs. Diamagnetic behavior of KTO-derived NPs was also higher than the alkoxide-derived TiO 2 NPs. Keywords: TiO 2 nanoparticles, sol-gel, dielectric constant, grain size, anatase. Resumo Nanopartículas (NPs) de TiO 2 foram sintetizadas por métodos de sol-gel usando dois diferentes precursores, tetraisopropóxido de titânio e oxalato de potássio e titânio (KTO). Os precursores tiveram profunda influência nas propriedades estruturais, morfológicas, dielétricas e magnéticas das NPs de TiO 2 sintetizadas, como evidenciado pelos estudos de DRX, FE-MEV, MET, LCR

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“…For anatase phase n is four and for rutile phase n is two [20,21]. Further, the specific surface area is calculated by the formula [19].…”

Section: Methodsmentioning

confidence: 99%

Spectroscopic Characterization of Sol Gel Derived Nano TiO2 Particles

Singh¹,

Ghosh²,

Maitra³

2017

Advances in Ceramic Science and Engineering

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TiO2 Nanoparticles were synthesized by sol-gel method from potassium titanium oxalate precursor. Influence of heat treatment on structural, morphological and optical properties of synthesized TiO2 particles has been investigated by XRD, SEM, EDX, FTIR, UV-Visible absorption spectroscopy, Raman spectroscopy and PL spectroscopy. XRD analysis revealed the formation of anatase single phase at 550 o C. But some secondary non stoichiometric phaseswere also formed after heat treatment at 750 and 900 o C. The lattice parameters, crystallite sizes and volume of the unit cell, X-ray density and surface area of TiO2 nanoparticles were determined from XRD analysis. SEM analysis showed that the synthesized nanoparticles were in the nano dimension, nearly spherical and agglomerated in morphology. EDX analysis showed that the synthesized TiO2 nanoprticles was near stoichiometric and oxygen vacancy in TiO2 increased with the increase in the calcination temperature. The presence of Ti-O and Ti-O-Ti in the synthesized particles was confirmed from FTIR spectra. PL spectra showed a change in the intensity due to the change in crystal structure. UV-visible absorption spectra showed that the absorption edge was shifted towards the higher wavelength with the increase in the calcination temperature while the corresponding band gap energy of semiconducting nanoparticles decreased. Shifts of Raman bands remained unaffected with the variation in crystallite size when the calcination temperature was increased from 750 to 900 o C.

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Structural, optical and charge transport study of rutile TiO2 nanocrystals at two calcination temperatures

Cited by 116 publications

References 66 publications

Effect of TiO2 nanoparticles in the earthworm reproduction test

Effect of TiO2 nanoparticles in the earthworm reproduction test

Influence of precursor type on structural, morphological, dielectric and magnetic properties of TiO2 nanoparticles

Spectroscopic Characterization of Sol Gel Derived Nano TiO2 Particles

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