Tunable Multipolar Surface Plasmons in 2D Ti3 C2 T x MXene Flakes

ACS Nano
Jehad K El-DemellawiHusam N Alshareef

Abstract

2D Ti3C2 T x MXenes were recently shown to exhibit intense surface plasmon (SP) excitations; however, their spatial variation over individual Ti3C2 T x flakes remains undiscovered. Here, we use scanning transmission electron microscopy (STEM) combined with ultra-high-resolution electron energy loss spectroscopy (EELS) to investigate the spatial and energy distribution of SPs (both optically active and forbidden modes) in mono- and multilayered Ti3C2 T x flakes. With STEM-EELS mapping, the inherent interband transition in addition to a variety of transversal and longitudinal SP modes (ranging from visible down to 0.1 eV in MIR) are directly visualized and correlated with the shape, size, and thickness of Ti3C2 T x flakes. The independent polarizability of Ti3C2 T x monolayers is unambiguously demonstrated and attributed to their unusual weak interlayer coupling. This characteristic allows for engineering a class of nanoscale systems, where each monolayer in the multilayered structure of Ti3C2 T x has its own set of SPs with distinctive multipolar characters. Moreover, the tunability of the SP energies is highlighted by conducting in situ heating STEM to monitor the change of the surface functionalization of Ti3C2 T x through ann...Continue Reading

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Citations

Nov 20, 2018·Advanced Materials·Kanit Hantanasirisakul, Yury Gogotsi
Nov 6, 2018·Chemical Society Reviews·Jinbo PangMark H Rummeli
Jun 22, 2019·Advanced Materials·Dhinesh Babu VelusamyHusam N Alshareef
Mar 24, 2020·Advanced Materials·Yun-Pei ZhuHusam N Alshareef
Apr 3, 2020·Advanced Materials·Yi-Zhou ZhangHusam N Alshareef
Jul 2, 2020·Nanoscale·Geetha ValurouthuYury Gogotsi
Sep 17, 2020·Chemical Society Reviews·Yi-Zhou ZhangHusam N Alshareef
Jan 28, 2021·ACS Nano·Ali JawaidRichard A Vaia
May 1, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·James E HecklerDhriti Nepal
May 28, 2021·Nature Communications·Nick A ShepelinAmanda V Ellis
Jun 12, 2021·Science·Armin VahidMohammadiYury Gogotsi
Aug 26, 2021·ACS Nano·Yingqiao WangTzahi Cohen-Karni
Sep 1, 2021·ACS Nano·Mikhail VolkovPeter Baum
Jan 22, 2022·ACS Applied Materials & Interfaces·Mustakeem MustakeemNoreddine Ghaffour
Feb 2, 2022·ACS Applied Materials & Interfaces·Jihua ZouJiang Wu

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