Effect of calcination on band gaps for electrospun titania nanofibers heated in air–argon mixtures

Albetran, Hani Manssor; O’Connor, B. H.; Low, It-Meng

doi:10.1016/j.matdes.2015.12.044

Cited by 39 publications

(23 citation statements)

References 40 publications

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“…The optical energy band gap is recognized by plotting the intercept of tangent to the x-axis in a graph. The annealed TNFs demonstrated an absorption peak shift from 325 nm to 335 nm [50,51]. The calculated optical band gap from (αhν) 1/2 versus hν plot for as-spun and annealed TNFs are 3.18 eV and 3.08 eV.…”

Section: Xrd and Raman Studiesmentioning

confidence: 90%

Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

Narayana

Hussain

Reddy

2020

Mater. Res. Express

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Nanofibers are one dimensional (1D) nanoarchitecture materials having high surface-to-volume ratio which provides improved ion diffusion and high mechanical strength to prevent volume expansion during electrochemical process and enhance the cycle stability. In the present study, TiO 2 nanofibers (TNFs) were successfully synthesized on an aluminum collector with a polymer concentration of 9 wt % by cost-effective electrospinning technique followed by annealing at a temperature 500°C. The XRD spectrum of electrospun TNFs exhibited predominant (101) orientation corresponding to anatase TiO 2 with I4 1 /amd symmetry. The estimated average crystallite size is 18 nm. The strongest Raman vibrational mode at 143 cm −1 confirms the phase purity of TNFs. The surface morphological feature depicts interconnected network fibers with a variation in the fiber diameter and the estimated average diameter is ∼150±20 nm. Very smooth surface and homogenously distributed ultra long nanofibers are observed from TEM analysis. The newly fabricated TNF electrode delivered a specific capacitance of 75 Fg −1 and retained 95% capacitance even after 5000 cycles. Moreover, it exhibited energy density and power density values of 24 Whkg −1 and 22.08 Wkg −1 respectively. The large capacitance, high coulombic efficiency and good structural stability demonstrate that TNFs should open up new opportunities for the next-generation high performance supercapacitors.

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Section: Xrd and Raman Studiesmentioning

confidence: 90%

Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

Narayana

Hussain

Reddy

2020

Mater. Res. Express

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“…In general, two approaches have been employed to prepare electrospun metal oxide NFs, i.e., a polymer-assisted spinning method and direct electrospinning without using a polymer [230][231][232][233][234]. The former strategy involves the mixing of metal alkoxide sol with a polymer solution in which the polymer controls the rheology during electrospinning.…”

Section: Electrospinningmentioning

confidence: 99%

“…Albetran et al studied the effect of calcination treatment on the bandgap reduction in electrospun titania nanofibers exposed to pure argon, air, and air-argon mixtures at 900 • C [233]. The spinning solution was prepared by mixing TTIP, ethanol, and acetic acid in a fixed volume ratio of 3:3:1, followed by the addition of 12 wt% PVP.…”

Section: Electrospinningmentioning

confidence: 99%

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

2020

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This article provides an overview of current research into the development, synthesis, photocatalytic bacterial activity, biocompatibility and cytotoxic properties of various visible-light active titanium dioxide (TiO2) nanoparticles (NPs) and their nanocomposites. To achieve antibacterial inactivation under visible light, TiO2 NPs are doped with metal and non-metal elements, modified with carbonaceous nanomaterials, and coupled with other metal oxide semiconductors. Transition metals introduce a localized d-electron state just below the conduction band of TiO2 NPs, thereby narrowing the bandgap and causing a red shift of the optical absorption edge into the visible region. Silver nanoparticles of doped TiO2 NPs experience surface plasmon resonance under visible light excitation, leading to the injection of hot electrons into the conduction band of TiO2 NPs to generate reactive oxygen species (ROS) for bacterial killing. The modification of TiO2 NPs with carbon nanotubes and graphene sheets also achieve the efficient creation of ROS under visible light irradiation. Furthermore, titanium-based alloy implants in orthopedics with enhanced antibacterial activity and biocompatibility can be achieved by forming a surface layer of Ag-doped titania nanotubes. By incorporating TiO2 NPs and Cu-doped TiO2 NPs into chitosan or the textile matrix, the resulting polymer nanocomposites exhibit excellent antimicrobial properties that can have applications as fruit/food wrapping films, self-cleaning fabrics, medical scaffolds and wound dressings. Considering the possible use of visible-light active TiO2 nanomaterials for various applications, their toxicity impact on the environment and public health is also addressed.

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“…Figure 6 shows the adsorption desorption plot for the TiO 2 and La:Co:TiO 2 nanocomposite and Table -2 summarizes their physical properties. The TiO 2 modified by Lanthanum and Cobalt are fragmentized to some extent during thermal treatment, leading to a marked increase of the surface areas and the average pore radius size and decreasing of the pore volume [44]. …”

Section: Surface Area Analysis (Bet)mentioning

confidence: 99%

Synthesis of La:Co:TiO<sub>2</sub> Nanocomposite and Photocatalytic Degradation of Tartaric Acid in Water at Various Parameters

Kumar¹

2017

NANO

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Abstract:In this study, nanocomposites of La:Co:TiO 2 was prepared by the co-precipitation method. The alcoholic route of synthesis was adopted here which was gives greenish homogeneous powder of La:Co:TiO 2 . The material was found in the nanodiamension by the SEM analysis. The rutile and anatase both phases were present in XRD analysis of the synthesized materials. The particle size was found 24 and 82 nm in case of La:Co:TiO 2 and pure Titania respectively. The surface area of Titania and La:Co:TiO 2 nanocomposites were found 6.4 and 43.2 m 2 /g. The band gap energy of Titania and La:Co:TiO 2 nanocomposites were found 3.2 eV and 3.0 eV respectively. The photodegradation of Tartaric Acid was investigate at different parameters such as temperature, concentration, pH of reaction mixture, dose of photocatalyst and time of illumination of UVVisible light. The photodegradation of Tartaric Acid occurs 60-80% in presence of Cobalt lanthanum modified Titania and in presence of neat Titania only 20-40% degradation was observed. It is found that photodegradation of Tartaric Acid follow the first order mechanism and its rate constant is become doubled when temperature is rise by 10°C.

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Effect of calcination on band gaps for electrospun titania nanofibers heated in air–argon mixtures

Cited by 39 publications

References 40 publications

Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

Synthesis of La:Co:TiO<sub>2</sub> Nanocomposite and Photocatalytic Degradation of Tartaric Acid in Water at Various Parameters

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Effect of calcination on band gaps for electrospun titania nanofibers heated in air–argon mixtures

Cited by 39 publications

References 40 publications

Electrospun TiO2 nanofiber electrodes for high performance supercapacitors

Electrospun TiO2 nanofiber electrodes for high performance supercapacitors

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

Synthesis of La:Co:TiO&lt;sub&gt;2&lt;/sub&gt; Nanocomposite and Photocatalytic Degradation of Tartaric Acid in Water at Various Parameters

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Product

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Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

Synthesis of La:Co:TiO<sub>2</sub> Nanocomposite and Photocatalytic Degradation of Tartaric Acid in Water at Various Parameters