5 years ago

Aligned Growth of Methylene Blue Films on TiO2 Single Crystals

Aligned Growth of Methylene Blue Films on TiO2 Single Crystals
Ryosuke Fukino, Ryuzi Katoh
We found epitaxial growth of needle-like nanosized crystals of methylene blue (MB). The nanosized crystals grew spontaneously along the c-axis of the (110) surface of a TiO2 single crystal by using the dip-coating method from solution. This epitaxial growth of the nanosized crystals is induced by the bridging oxygen rows align along the crystal c-axis. We also found that the alignment direction could be controlled by rubbing the surface of the substrate prior to dye-loading. The memory of the alignment direction induced by the rubbing treatment was erased by thermal annealing at 620 K. These findings suggest that the nanostructure on the TiO2 surface plays an important role in the aligned growth of MB nanosized crystals.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b04676

DOI: 10.1021/acs.jpcc.7b04676

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