▎ 摘　　要

NOVELTY - Photothermal conversion film i.e. carbon nanotube (CNT)-reduced graphene oxide (rGO)-bacterial cellulose (BC) hydrogel has complex layer structure, which comprises upper layer of CNT-BC hydrogel and lower layer of rGO-BC hydrogel. The CNT-BC hydrogel comprises BC hydrogel and CNT distributed in the BC hydrogel. The rGO-BC hydrogel comprises BC hydrogel and rGO distributed in the BC hydrogel. The CNT-BC hydrogel and rGO-BC hydrogel are connected by BC nanofibers. USE - The photothermal conversion film is useful for converting light energy of sunlight into heat energy. ADVANTAGE - The photothermal conversion film has heterostructure, enhanced light trapping effect, thickness of 1.5-2.5 mm, light absorption rate of 93-95.5%, high absorption of near-infrared light and good photothermal performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing the photothermal conversion film, involves adding nutrient solution containing CNT and Acetobacter xylinum solution to the petri dish for static culture to obtain CNT-BC hydrogel, then adding he nutrient solution containing GO and the original bacterial solution of A.xylinum to the petri dish filled with CNT-BC hydrogel at the bottom for static culture to form GO-BC hydrogel on top of CNT-BC hydrogel to obtain CNT-GO-BC hydrogel and reducing the GO in the CNT-GO-BC hydrogel to obtain film.