A researcher synthesized one group of TiO$2$ nanotubes and one group of TiO$2$ nanoparticles, and planned to select TiO$2$ nanotubes or TiO$2$ nanoparticles to make anti$-$bacterial paint for walls in hospitals. The researcher used blue light and orange light to illuminate the two groups of nano$-$TiO$2$ and noticed that the nanotubes ecame conductive when exposed to the blue light. While the nanoparticles became conductive when illuminated by both the blue light and orange light. Do you recommend the TiO$2$ nanotubes or TiO$2$ nanoparticles for the application? Why?

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