Abstract
In this study, we design a fiber-based lightening TEM holder which is compatible with JEOL 2010F and contains a light source illuminating sample along the holder axis that allows sample to be exposed to electron beam and light at the same time. TEM chamber must maintain at ultra-high vacuum environment, so the samples are confined to be in solid state. In order to observe wet samples in TEM, we use the Wet-Cell chips which was designed by our laboratory. This fiber-based lightening TEM holder also can be integrated with Wet Cell chip and provide liquid environment for TEM observation. And it also offers us a chance to in-situ observe the photo-catalytic reaction in real reactional environment. More importantly, we successfully observe the surface amorphization phenomenon in anatase titanium dioxide during UV light irradiation in liquid environment. We also observed the nano-bubbles generation reaction induced by UV light. Use EELS analysis techniques to qualitatively define the oxidation state of titanium in the surface amorphous layer. The valence change is relative to the water splitting reaction mechanism which is induced by UV light through photo-catalysts such as titanium dioxide.