Precursor Modification and Refluxing Effects on Titania Nanostructures Prepared via Sol Gel Reflux Synthesis

Javed, Sofia; Mujahid, Mohammad; Islam, Mohammad Shahidul; Akram, Muhammad Aftab

doi:10.1002/9781118663547.ch17

Cited by 2 publications

(1 citation statement)

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“…According to literature, the formation of the complex between Ti (IV) and acac takes place by substitution, i.e. an acac group replaces the isopropoxide bonded to Ti(IV) [27]; it is likely, however, that the structure and coordination of the complex changes, as acac is a bidentade ligand [28]. Indeed, the use of β-diketonate molecules is known to lead to a higher Ti (IV) coordination number [29].…”

Section: Analysis Of the Precursormentioning

confidence: 99%

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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Section: Analysis Of the Precursormentioning

confidence: 99%