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Direct conversion of TiO2 sol to nanocrystalline anatase at 85 °C

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Abstract

Nanocrystalline TiO2 anatase with particle size in the range of 5–7 nm has been prepared by in situ cracking of the sol at 85 °C, thereby avoiding the intermediate gel formation process. Hydrolysis of Ti(O-isoPr)4 was carried out in excess of 2-propanol to keep the suspension of fine particles from agglomeration. Differential thermal analysis, thermogravimetric analysis, differential scanning calorimetry, powder x-ray diffraction (XRD), and electron microscopy have been used to characterize the samples. Gel to crystalline conversion, which requires a temperature of at least 400 °C, can be achieved by digesting the TiO2 sol at 85 °C. XRD and selected area electron diffraction patterns show the presence of a small amount of brookite phase along with the major anatase phase. High-resolution transmission electron microscopy shows that the average grain size of TiO2 particle remains around 5–9 nm even when heated at 510 °C.

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Authors and Affiliations

  1. Mechanical Engineering Department, Louisiana State University, 70803, Baton Rouge, Louisiana, USA

    K. I. Gnanasekar, V. Subramanian, J. Robinson, K. I. Gnanasekar, K. I. Gnanasekar, K. I. Gnanasekar & J. C. Jiang

  2. Biotechnology Center For Fuels and Chemicals, National Renewable Energy Laboratory, 80401, 1617 Cole Blvd, Golden, Colorado, USA

    Fanney E. Posey

  3. Surface Science, Spectroscopy and Solid State Ionics Laboratory, Department of Physics, Southern University and A&M College, 70813, Baton Rouge, Louisiana, USA

    B. Rambabu

Authors
  1. K. I. Gnanasekar
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  2. V. Subramanian
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  3. J. Robinson
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  4. K. I. Gnanasekar
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  5. K. I. Gnanasekar
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  6. K. I. Gnanasekar
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  7. J. C. Jiang
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Correspondence to K. I. Gnanasekar.

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Gnanasekar, K.I., Subramanian, V., Robinson, J. et al. Direct conversion of TiO2 sol to nanocrystalline anatase at 85 °C. Journal of Materials Research 17, 1507–1512 (2002). https://doi.org/10.1557/JMR.2002.0224

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  • DOI: https://doi.org/10.1557/JMR.2002.0224

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