▎ 摘　　要

Graphene oxide (GO) with an ideal two-dimensional structure, presents outstanding optical. electric, and mechanical properties which draws great attention in advanced information devices. Recently. GO-based films were found to show photochromic behavior, especially for the TiO2 involved system which has potential data processing capability, such as storing holograms. However, expanding spectral response range and increasing exposure sensitivity are still challenges for such a film, due to the limited photo-quantum efficiency in reduction reaction. Here, an innovative method of "ImmersionDropping" technology is proposed to fabricate GO-based continuous films. We, for the first time, achieve colored holography from violet to yellow regions on GO/TiO2 nanocomposite films with introduction of weak acid molecules. A "diffraction self-enhancement" is observed. The obtained results benefit from the broadband photo-response of weak acid molecules and photo-triggered transferring of electrons in multi-channels. This work provides a research strategy for the large-capacity information storage and colorful display device. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement