About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPU-17: Thickness and Homogeneity Tuning of Electrochemical Intercalated and Exfoliated Structures of (Sb 2 Te 3 ) 1 (Sb 2 ) 1 via Cation Size |
| Author(s) |
Selene Koremenos-Tsebelis, Tung Nguyen |
| On-Site Speaker (Planned) |
Selene Koremenos-Tsebelis |
| Abstract Scope |
A simple electrochemical approach for synthesizing mono-to-few-layer 2D van der Waals (Sb₂Te₃)₁·(Sb₂)₁ from a bulk ingot is demonstrated using cation intercalation and exfoliation. The ingot was assembled as a cathode and intercalated at −2.0 V vs. Ag/AgCl using hydronium (H₃O⁺), tetrapropylammonium (TPA⁺), sodium (Na⁺), and lithium (Li⁺). Exfoliated materials were characterized by SEM, XRD, TEM, AFM, Raman spectroscopy, and cyclic voltammetry. Larger cations exhibited lower intercalation peak current densities and smaller cycle-to-cycle changes. Chronoamperometry and observation confirmed that TPA⁺, Na⁺, and Li⁺ enabled exfoliation via intercalation, while exfoliation with H₃O⁺ was assisted by the hydrogen evolution reaction. AFM showed that Li⁺ intercalation produced ~4.5 nm flakes, corresponding to six layers. Selected area electron diffraction revealed that larger cations yielded more homogeneous, single-crystalline flakes, whereas smaller cations produced increased disorder. Raman spectra showed blue shifts of Eg modes due to thickness reduction. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Characterization, Electronic Materials, |