| Photocatalytic Activity of Room Temperature Prepared
Sol-Gel Spin-Coated Anorthic Magnéli Phase (Ti4O7
)
Thin Films |
Muthukumar Murugesan,a
Kumar Tamilarasan,b
Amali Roselin Arockiam,b, c Ajith Kumar
Neelamegam,d
Karuppannan Periyannan Ganesan,e
Karkuzhali Rajendran,f
Gopu
Gopalakrishnan,f
Sivakumar Ganesan,g
Joseph Panneer Dossh
and Anandhan Narayanasamyb,*
Pages : 261-271
DOI: 10.1080/0371750X.2025.2552480
|
| Abstract |
| Substoichiometric titanium oxides, particularly Magnéli phases (TinO2n–1, n=3-10),
exhibit promising properties for various functional applications. However, achieving
high-quality Magnéli phase (Ti4O7
) thin films at room temperature remains a significant
challenge due to limitations in conventional deposition techniques. In this study, we
report the successful room temperature fabrication of pure Ti4O7
thin films on glass
substrates using a sol-gel spin coating approach. Structural, optical, morphological,
elemental, luminescence and photocatalytic properties of the films were systematically
investigated by varying precursor concentrations (1 and 4 mmol). Structural analysis
confirmed the formation of anorthic crystal structure of Ti4O7
without any secondary
phase. Optical studies revealed bandgap variations (2.08 and 3.75 eV) attributed to
differences in film thickness. Photocatalytic performance, assessed through methylene
blue dye degradation under visible light, demonstrated enhanced activity for the 1
mmol film, achieving a degradation efficiency of 72% and a rate constant of 3.3036 ï‚´
10–3 min–1. This work offers a feasible chemical solution sol-gel technique to overcome
room temperature deposition limitations of Magnéli phases, and opening new
possibilities for their integration into photocatalytic and optoelectronic applications.
[Keywords: Ti4O7 Magnéli, Thin films, Sol-gel, Spin coating, Waster water remediation,
Dye degradation, Sub-stoichiometric] |
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