title: In situ optical measurement of the rapid Li intercalation and deintercalation dynamics in colloidal 2D layered TiS2 nanodiscs.
abstract: We report the in situ optical measurements of the rapid Li intercalation and deintercalation dynamics in 2-dimensional (2D) layered transition metal dichalcogenide (TMD) with a nanoscale lateral dimension using thin films fabricated with size-controlled colloidal TiS2 nanodiscs. The films exhibiting high optical homogeneity, where the interband absorption changes near-linearly to the amount of intercalated Li, enabled facile optical probing of the intercalation dynamics overcoming the shortcomings of amperometry susceptible to complications from non-Faradaic processes. The time scale of Li intercalation and deintercalation was on the order of seconds in the nanodiscs of ∼100 nm lateral dimension, indicating sufficiently rapid dynamic control of the intercalation-induced material properties with a reduced lateral dimension. The change in the rate and reversibility of the dynamics during the multiple intercalation/deintercalation cycles was also measured, providing a unique window to observe the effect of potential structural changes on the intercalation and deintercalation dynamics in 2D layered TMD structures with a nanoscale lateral dimension.
authors.affiliation: Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA. dhson@chem.tamu.edu.
authors.forename: Jiageng
authors.initials: J
authors.lastname: Ren
authors.forename: Luis E
authors.initials: LE
authors.lastname: Camacho-Forero
authors.forename: Daniel
authors.initials: D
authors.lastname: Rossi
authors.forename: Yerok
authors.initials: Y
authors.lastname: Park
authors.forename: Perla B
authors.initials: PB
authors.lastname: Balbuena
authors.forename: Dong Hee
authors.initials: DH
authors.lastname: Son