Structural, optical and electrochemical properties of TiO2 nanoparticles synthesized using medicinal plant leaf extract

Reddy, P. Naresh Kumar; Shaik, Dadamiah P.M.D.; Ganesh, Venkataraman; Nagamalleswari, D.; Thyagarajan, K.; Prasanth, P Vishnu

doi:10.1016/j.ceramint.2019.05.147

Cited by 55 publications

(9 citation statements)

References 41 publications

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“…TiO 2 exhibited a rectangular behaviour with a reversible nature, which suggests the prominence of non‐faradic behaviour. Earlier studies based on TiO 2 have witnessed this non‐faradic behaviour 68,69 . rGO‐TiO 2 had the least rectangular curve compared with other nanocomposites, inferring the presence of lower capacitance due to the repealing of the interaction of the rGO‐TiO 2 electrode and electrolyte (KOH ions) 70 .…”

Section: Resultsmentioning

confidence: 88%

“…Earlier studies based on TiO 2 have witnessed this non-faradic behaviour. 68,69 rGO-TiO 2 had the least rectangular curve compared with other nanocomposites, inferring the presence of lower capacitance due to the repealing of the interaction of the rGO-TiO 2 electrode and electrolyte (KOH ions). 70 N-rGO-TiO 2 displayed the most rectangular behaviour due to higher-level charge separation and electrochemical conductivity, implying a higher capacitance.…”

Section: Electrochemical Propertiesmentioning

confidence: 98%

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Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO₂‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Ngidi

Muchuweni

Nyamori

2022

Intl J of Energy Research

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Summary The photoanode in a dye‐sensitised solar cell (DSSC) plays a crucial role in achieving a high power conversion efficiency (PCE). It supports the sensitiser and acts as a transporter of photo‐excited electrons from the sensitiser to the external circuit. These two functions are enhanced by a large surface area and a fast charge transport rate. Typically, the photoanode consists of titanium dioxide (TiO2) nanoparticles. If the nanoparticles are deposited on a carbonaceous substrate, it facilitates the transport of photogenerated electrons. This study compared the photoanode performance of boron‐ or nitrogen‐doped reduced graphene oxide (B‐ or N‐rGO) nanocomposites integrated with TiO2. All nanocomposites exhibited mainly the anatase TiO2 phase, and N‐rGO‐TiO2 exhibited the lowest bandgap of 2.1 eV, which was attributed to the formation of Ti‐O‐C and Ti‐O‐N bonds. Also, N‐rGO‐TiO2 displayed good charge carrier separation ability and electron transfer. The low TiO2 content in the nanocomposites led to the suppression of electron‐hole recombination, reduction in the bandgap energy and improvement in electron transport, resulting in higher current density. Two photo‐harvesting dyes (sensitisers) were investigated, that is, eosin B and Sudan II. A higher light‐harvesting efficiency was obtained from eosin B, indicating the presence of more dye molecules anchored onto the TiO2. Photoanodes fabricated from N‐rGO‐TiO2 and B‐rGO‐TiO2 showed enhanced photo‐exciton generation, higher short‐circuit current densities and significantly better PCEs of 3.94% and 2.55%, respectively, than their undoped rGO‐TiO2 counterparts (1.78%). This work demonstrates that heteroatom‐doped rGO‐TiO2‐based nanocomposites can improve the rate of transportation and collection of electrons, thereby enhancing the performance of DSSCs.

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Section: Resultsmentioning

confidence: 88%

Section: Electrochemical Propertiesmentioning

confidence: 98%

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO₂‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Ngidi

Muchuweni

Nyamori

2022

Intl J of Energy Research

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“…It can be seen that a sharp peak is present at 145 cm −1 , which corresponds to anatase TiO 2 [7], and a much smaller peak at 196 cm −1 also belongs to the same phase. Additional peaks at 440 and 610 cm −1 are also present, which are associated with rutile TiO 2 [32]. Samples AA_0.5 and AA_4, deposited using acac, showed similar features, i.e.…”

Section: Deposition Experimentsmentioning

confidence: 83%

Nanostructured titanium dioxide coatings prepared by Aerosol Assisted Chemical Vapour Deposition (AACVD)

Taylor

Pullar

Parkin

et al. 2020

Journal of Photochemistry and Photobiology A: Chemistry

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Titanium dioxide is a compound of great interest, due to its functional properties; one of its most important uses is as a photocatalyst. TiO 2 coatings can be deposited using different techniques. Aerosol Assisted Chemical Vapour Deposition (AACVD) is particularly interesting, as high temperature or pressure are not necessary to generate the gaseous precursors. Furthermore, by carefully choosing the deposition conditions (i.e. deposition temperature, solvent), it is possible to obtain deposits with different morphology and, consequently, different functional properties. In this paper we present the synthesis of titanium dioxide coatings with AACVD using complexes between titanium isopropoxide (TIPP) and acetyl acetone (acac) as precursors. Deposition experiments were performed using different ratios of TIPP to acac, to assess the effect on the composition of the coatings, their morphology and photocatalytic activity. Results showed that the use of acac led to nanostructured titanium dioxide (nanoparticles of about 10−25 nm diameter). Raman analysis showed the presence of both anatase and rutile phases. XPS analysis indicated the presence of residual carbonaceous species in the coatings; despite this, they displayed photocatalytic properties similar or superior to AACVD films without carbon. Photocatalytic tests, performed measuring the Formal Quantum Efficiency (FQE) and the Formal Quantum Yield (FQY) in the degradation of resazurin, showed that a acac:TIPP ratio equal to 1 led to the material with the highest performance, as the FQE value was about three times higher than that for the coating prepared with TIPP alone. Overall the complexes between TIPP and acac are promising precursors for the AACVD technique, leading to nanostructured coatings with enhanced performance.

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“…Titanium dioxide (TiO 2 ) is characterized by being a photosensitive semiconductor, having good optical and electrochemical properties, 1 good dispersibility in organic solutions, and low toxicity. 2 These properties have led to numerous investigations directed to applications such as the removal of contaminants by photocatalysis 3−5 and photoelectrochemical devices for hydrogen generation.…”

Section: Introductionmentioning

confidence: 99%

“…Titanium dioxide (TiO 2 ) is characterized by being a photosensitive semiconductor, having good optical and electrochemical properties, good dispersibility in organic solutions, and low toxicity . These properties have led to numerous investigations directed to applications such as the removal of contaminants by photocatalysis − and photoelectrochemical devices for hydrogen generation. , TiO 2 can present several different phases in the nanometric range at different temperatures, which are anatase, brookite, and rutile, though anatase has excellent physical and chemical properties for environmental remediation .…”

Section: Introductionmentioning

confidence: 99%

Effect of Fe–N Codoping on the Optical Properties of TiO₂ for Use in Photoelectrolysis of Water

et al. 2021

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TiO2 nanoparticles were synthesized by green chemistry where organic solvents are replaced by an aqueous extract solution of lemongrass leaves that act as a reducer and growth-stopper agent. The nanoparticles were codoped with N–Fe to modify the absorption range in the electromagnetic spectrum and were characterized by Fourier-transform infrared (FTIR), scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS), and UV–vis/diffuse reflectance spectroscopy (DRS). The modified samples with Fe and N resulted in smaller nanoparticle size values than pure TiO2. Similarly, the band-gap energy for doped nanoparticles decreased to 2.22 eV in relation to the value of 3.09 eV for pure TiO2, due to the introduction of new energy levels.

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Structural, optical and electrochemical properties of TiO2 nanoparticles synthesized using medicinal plant leaf extract

Cited by 55 publications

References 41 publications

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO₂‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO₂‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Nanostructured titanium dioxide coatings prepared by Aerosol Assisted Chemical Vapour Deposition (AACVD)

Effect of Fe–N Codoping on the Optical Properties of TiO₂ for Use in Photoelectrolysis of Water

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Structural, optical and electrochemical properties of TiO2 nanoparticles synthesized using medicinal plant leaf extract

Cited by 55 publications

References 41 publications

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO2‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO2‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Nanostructured titanium dioxide coatings prepared by Aerosol Assisted Chemical Vapour Deposition (AACVD)

Effect of Fe–N Codoping on the Optical Properties of TiO2 for Use in Photoelectrolysis of Water

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Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO₂‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Enhanced performance by heteroatom‐doped reduced grapheneoxide‐TiO₂‐based nanocomposites as photoanodes in dye‐sensitised solar cells

Effect of Fe–N Codoping on the Optical Properties of TiO₂ for Use in Photoelectrolysis of Water