Control of metal oxides’ electronic conductivity through visual intercalation chemical reactions

• Published in: Nature communications Vol. 14; no. 1; pp. 6130 - 11
• Main Authors: Zhang, Yuanyuan, Zhang, Xiaohua, Pang, Quanquan, Yan, Jianhua
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 02.10.2023; Nature Publishing Group; Nature Portfolio
• Subjects: 119/118; 140/133; 140/146; 147/135; 147/143; 147/28; 639/301/357/1016; 639/638/298/917; 639/925/357/551; Casting; Cations; Chemical reactions; Chemical synthesis; Conductivity; Humanities and Social Sciences; Intercalation; Metal oxides; Metals; multidisciplinary; Nanofibers; Optimization; Oxide coatings; Oxides; Room temperature; Science; Science (multidisciplinary); Titanium dioxide
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-023-41935-x

Cation intercalation is an effective method to optimize the electronic structures of metal oxides, but tuning intercalation structure and conductivity by manipulating ion movement is difficult. Here, we report a visual topochemical synthesis strategy to control intercalation pathways and structures and realize the rapid synthesis of flexible conductive metal oxide films in one minute at room temperature. Using flexible TiO 2 nanofiber films as the prototype, we design three charge-driven models to intercalate preset Li + -ions into the TiO 2 lattice slowly (µm/s), rapidly (mm/s), or ultrafast (cm/s). The Li + -intercalation causes real-time color changes of the TiO 2 films from white to blue and then black, corresponding to the structures of Li x TiO 2 and Li x TiO 2-δ , and the enhanced conductivity from 0 to 1 and 40 S/m. This work realizes large-scale and rapid synthesis of flexible TiO 2 nanofiber films with tunable conductivity and is expected to extend the synthesis to other conductive metal oxide films. Cation intercalation is an effective method to optimise the electronic structures of metal oxides. Here authors present a visual intercalation chemical synthesis strategy to control intercalated structures of metal oxides and synthesise flexible conductive metal oxide films in one minute at room temperature.