Details

Autor(en) / Beteiligte

• Preetha, S.
• Pillai, R.
• Ramamoorthy, S.
• Mayeen, A.
• Archana, K.M.
• Kalarikkal, N.
• Narasimhamurthy, B.
• Lekshmi, I.C.

Titel

TiO2–rGO nanocomposites with high rGO content and luminescence quenching through green redox synthesis

Ist Teil von

• Surfaces and interfaces, 2022-06, Vol.30, p.101812, Article 101812

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •TiO2–rGO nanocomposite with 47.1 wt% rGO prepared by redox green synthesis.•TiO2 NCs size gets smaller and intercalate with rGO sheets as rGO content increases.•Light absorption increases with rGO content along with slight increase in bandgap.•rGO is exfoliated to few layers and provide low defect states for TiO2–rGO in the visible region.•High PL quenching is observed in TiO2–rGO due to long-lived electron transfer states enabling 100% photocatalytic degradation of textile dye. We developed TiO2–rGO nanocomposites with high exfoliated rGO content upto 47.1% (TG4) by weight hitherto not reported, through green redox synthesis. Progressive reduction of TiO2 nanocrystal size and their in situ intercalation occurred on increasing rGO via one pot synthesis, not reported previously and forming highly stable Ti–O–C bonds. With increase in rGO content, the exfoliation in the nanocomposite was also limited to single-few layered graphene oxide sheets through use of ascorbic acid avoiding restacking, and thereby the recombination of photogenerated carriers. TG4 showed 50% photoluminescence (PL) quenching indicating long-lived electron transfer state with rGO and apparent rate of nonradiative excited state decay of 1.15 × 108 s−1. Details of lattice orientation, Raman spectra, electronic states and PL lifetime decay are discussed to elucidate effective charge carrier separation in the nanocomposite. Near complete photodegradation of Alizarin Yellow GG azo dye, an industrial pollutant, could be obtained under direct sunlight using TG4 as catalyst. [Display omitted]