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• W2806167103 abstract "We report on the effect of chromium doping on the band gap lowering of nano-titania (TiO 2 ) and subsequent implications as regards coloration characteristics mediated via photochromism and thermochromism processes. As can be found in the X-ray diffractograms, the sol-gel derived, Cr 3+ -doped nano-TiO 2 systems have exhibited an anatase phase with the evidence of peak shifting towards a lower diffraction angle. The average crystallite size decreases, whereas lattice unit cell parameters and, consequently, cell volume, tend to increase with the inclusion of Cr 3+ into the titania host. To be specific, 1% Cr-doped titania system showed nearly 5.8% cell expansion as compared to its un-doped counterpart. As revealed from the optical absorption spectroscopy, a narrowing of band gap is observed for the Cr doped nano-titania system: 3.18 eV for the un-doped system, and 2.61 and 2.41 eV for 0.3% and 1% Cr doping cases, respectively, considering direct band-to-band transitions. Moreover, doping led noticeable lowering of the exponent (n value), from its normal value, which suggests inclusion of adequate non-parabolicity feature to the energy band scheme. The photochromic feature, for a given incident radiation, demonstrates a lowered transmission response with increasing Cr content. A reversible thermochromism response has also been demonstrated for doped nano-titania systems subjected to heating with temperature varying between 0–55 °C. The Cr 3+ doped nano-titania and similar systems would find scope in smart windows, display components, photocatalysis, etc., when a select coloration is desired." @default.
• W2806167103 created "2018-06-13" @default.
• W2806167103 creator A5036189095 @default.
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• W2806167103 date "2019-04-01" @default.
• W2806167103 modified "2023-09-24" @default.
• W2806167103 title "Influence of mild Cr³⁺ doping on the structural, optical, photochromic, and thermochromic reversibility of nano-titania systems" @default.
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• W2806167103 doi "https://doi.org/10.1139/cjp-2017-0533" @default.
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