Enhanced Photoreversible Color Switching of Methylene Blue Catalyzed by Magnesium-doped TiO2 Nanocrystals

doi:10.15541/jim20180070

Abstract

Abstract:

Because the advantages of non-direct contact, remote control, high efficiency and fastness, light-driven reversible color switching materials (LDRCSMs) have important applications in information storage, display devices, sensors, and other fields. The combination of inorganic materials and organic materials to achieve synergies is one of the research hotspots of new LDRCSMs. A one-step liquid-phase synthesis method was used to prepare Mg-doped TiO₂ nanocrystals (Mg-TiO₂ NCs) with a particle size of ~5 nm. The reversible light-responsive color switching of methylene blue (MB) by using Mg-TiO₂ NCs was investigated. The results show that Mg²⁺ doping generates impurity levels in the TiO₂ lattice, effectively inhibiting the recombination of photogenerated carriers and increasing the activity of TiO₂ photooxidation-reduced MB. On the other hand, Mg²⁺doping can decrease the absorption wavelength of TiO₂ NCs, which effectively represses the partial reduction of MB to reduced LMB under visible light irradiation, leading to a higher recoloration rate. Such LDRCSMs based on alkali metal-doped TiO₂ NCs may have potential application in many optoelectronic device fields.

Key words: TiO₂ nanocrystals, alkali metal doping, redox, methylene blue

CLC Number:

TK511

ZHAO Hai-Bing, XU Hai-Feng, YANG Ke-Wei, LIN Chen-Xue, FENG Miao, YU Yan. Enhanced Photoreversible Color Switching of Methylene Blue Catalyzed by Magnesium-doped TiO₂ Nanocrystals[J]. Journal of Inorganic Materials, 2018, 33(10): 1124-1130.

Figures/Tables 8

Fig. 1 XRD patterns (a) and Raman spectra (b) of pure TiO2 and Mg-TiO2 NC

Table 1 XRD analysis results of pure TiO2 and Mg-TiO2

Sample	Particle size D/nm	Interplanar spacing, d/nm	Cell parameters a=b/nm	2θ/(°)
TiO₂	5.21	0.35238	0.038052	25.253
Mg-TiO₂	4.54	0.35173	0.037950	25.273

Fig. 2 TEM images at different magnifications of (a, b) Mg-TiO2 and (c, d) TiO2

Fig. 3 Ti2p XPS spectra (a) of pure TiO2 and Mg-TiO2, and (b) Mg1s XPS spectrum (b) of Mg-TiO2

Fig. 4 FT-IR spectra (a) and UV-Vis absorption spectra (b) of pure TiO2 and Mg-TiO2Inset: Mott-Schottky plots and pictures of pure TiO2 and Mg-TiO2

Fig. 5 UV-Vis spectra showing the decoloration process of MB under UV irradiation ((a) TiO2, (c) Mg-TiO2); UV-Vis spectra showing the recoloration process of MB under visible light irradiation ((b)TiO2, (d) Mg-TiO2)Inset: the pictures of the reaction system solutions changing with the illumination time

Fig. 5 Fluorescence spectra (a) and photocurrent intensity (b) of pure TiO2 and Mg-TiO2

Fig. 7 Zeta-potential of pure TiO2 and Mg-TiO2 NCs

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Enhanced Photoreversible Color Switching of Methylene Blue Catalyzed by Magnesium-doped TiO₂ Nanocrystals

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