Ren Junkai, Stagi Luigi, Malfatti Luca, Paolucci Valentina, Cantalini Carlo, Garroni Sebastiano, Mureddu Marzia, Innocenzi Plinio
Laboratory of Materials Science and Nanotechnology (LMNT), Department of Biomedical Sciences, CR-INSTM, University of Sassari, 07100 Sassari, Italy.
Department of Industrial and Information Engineering and Economy, University of L'Aquila, 67100 L'Aquila, Italy.
Nanomaterials (Basel). 2022 Mar 25;12(7):1074. doi: 10.3390/nano12071074.
Heterostructures formed by anatase nanotitania and bidimensional semiconducting materials are expected to become the next-generation photocatalytic materials with an extended operating range and higher performances. The capability of fabricating optically transparent photocatalytic thin films is also a highly demanded technological issue, and increasing the performances of such devices would significantly impact several applications, from self-cleaning surfaces to photovoltaic systems. To improve the performances of such devices, WS/TiO heterostructures obtained by incorporating two-dimensional transition metal dichalcogenides layers into titania mesoporous ordered thin films have been fabricated. The self-assembly process has been carefully controlled to avoid disruption of the order during film fabrication. WS nanosheets of different sizes have been exfoliated by sonication and incorporated in the mesoporous films via one-pot processing. The WS nanosheets result as well-dispersed within the titania anatase mesoporous film that retains a mesoporous ordered structure. An enhanced photocatalytic response due to an interparticle electron transfer effect has been observed. The structural characterization of the heterostructure has revealed a tight interplay between the matrix and nanosheets rather than a simple additive co-catalyst effect.
由锐钛矿型纳米二氧化钛和二维半导体材料形成的异质结构有望成为下一代光催化材料，具有更宽的工作范围和更高的性能。制备光学透明光催化薄膜的能力也是一个备受关注的技术问题，提高此类器件的性能将对从自清洁表面到光伏系统等多种应用产生重大影响。为了提高此类器件的性能，通过将二维过渡金属二硫属化物层引入二氧化钛介孔有序薄膜中制备了WS/TiO异质结构。在薄膜制备过程中，对自组装过程进行了仔细控制，以避免破坏有序结构。通过超声处理剥离了不同尺寸的WS纳米片，并通过一锅法将其掺入介孔薄膜中。WS纳米片在二氧化钛锐钛矿介孔薄膜中分散良好，该薄膜保留了介孔有序结构。观察到由于粒子间电子转移效应导致的光催化响应增强。异质结构的结构表征揭示了基体与纳米片之间紧密的相互作用，而不是简单的添加剂助催化剂效应。
