Usuma Naknikham: Mutual-stabilization in chemically bonded graphene oxide-TiO2 heterostructures synthesized by a sol-gel approach

posted 3 Jul 2017, 05:43 by info admin
Usuma Naknikham1,* Vittorio Boffa1, Giuliana Magnacca2, Ang Qiao3, Lars Rosgaard Jensen4, Yuanzheng Yue1,3

1Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark
2Dipartimento di Chimica, Universitá di Torino, 10125 Torino, Italy
3 State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
4Department of Materials and Production, Aalborg University, 9220 Aalborg, Denmark
* Corresponding authors. Usuma Naknikham (e-mail: un@bio.aau.dk) 

We study the structure of the photocatalytic graphene oxide-titanium dioxide (GO-TiO2) nanocomposites prepared by in-situ sol-gel nucleation and growth of TiO2 on GO sheets. Furrier transform-infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) spectra of these composites indicate that the GO sheets and the TiO2 nanoparticles interact through Ti-O-C bonds. This chemical interaction is strong enough to ensure mutual stabilization during thermal annealing, and thereby GO inhibit TiO2 crystallization. In addition, thermal reduction of GO nanoribbons anchored to TiO2 nanoparticles occurs at a higher temperature and with a lower released energy than in the pure GO powder. Understanding of the mutual-stabilization mechanisms is critical for the rational design of the TiO2-GO photocatalysts.

Usuma Naknikham is currently Ph.D. student in Department of Chemistry and Bioscience, Aalborg University. She is studying on the titania-graphene catalysts membrane for abasement of the micropollutants. Her background is Diploma in Analytical Chemistry (2003), Bachelor of Science Degree in Material Science: Ceramic and Materials Science (2006) and Master of Science Degree in Ceramic Technology (2009) from Chulalongkorn University, Thailand. After graduation, she worked as scientist in Department of science service, Ministry of Science and Technology(Thailand) for 6 years and studied in the Ph.D. program at Aalborg University (AAU) since 2016. She had a short stay (1 month) at Turin University (Italy) for characterizing morphology and performances of new titania-graphene catalysts, and it was supported by the European Union project H2020‐MSCA‐RISE‐2014, n. 64555.

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