Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (10): 1124-1130.doi: 10.15541/jim20180070

• RESEARCH PAPER • Previous Articles     Next Articles

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

Hai-Bing ZHAO1,2(), Hai-Feng XU1,2, Ke-Wei YANG1,2, Chen-Xue LIN1,2, Miao FENG1,2, Yan YU1,2()   

  1. 1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116 China
    2. Key Laboratory of Eco-Materials Advanced Technology, Fuzhou University, Fuzhou 350116, China
  • Received:2018-02-06 Revised:2018-03-30 Online:2018-10-20 Published:2018-09-25
  • About author:ZHAO Hai-Bing. E-mail: 1913686245@qq.com
  • Supported by:
    National Natural Science Foundation of China (51402051, 51102047);Fujian Provincial Outstanding Young Scientists Program (2016);Fuzhou University, Expensive Equipment Open-end Test Fund (2018T005)

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