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MXenes for Plasmonic Photodetection
Author(s) -
Velusamy Dhinesh Babu,
ElDemellawi Jehad K.,
ElZohry Ahmed M.,
Giugni Andrea,
Lopatin Sergei,
Hedhili Mohamed N.,
Mansour Ahmed E.,
Fabrizio Enzo Di,
Mohammed Omar F.,
Alshareef Husam N.
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201807658
Subject(s) - mxenes , materials science , photodetection , plasmon , optoelectronics , raman spectroscopy , responsivity , photodetector , spectroscopy , photonics , femtosecond , surface plasmon , nanotechnology , optics , laser , physics , quantum mechanics
Abstract MXenes have recently shown impressive optical and plasmonic properties associated with their ultrathin‐atomic‐layer structure. However, their potential use in photonic and plasmonic devices has been only marginally explored. Photodetectors made of five different MXenes are fabricated, among which molybdenum carbide MXene (Mo 2 CT x ) exhibits the best performance. Mo 2 CT x MXene thin films deposited on paper substrates exhibit broad photoresponse in the range of 400–800 nm with high responsivity (up to 9 A W −1 ), detectivity (≈5 × 10 11 Jones), and reliable photoswitching characteristics at a wavelength of 660 nm. Spatially resolved electron energy‐loss spectroscopy and ultrafast femtosecond transient absorption spectroscopy of the MXene nanosheets reveal that the photoresponse of Mo 2 CT x is strongly dependent on its surface plasmon‐assisted hot carriers. Additionally, Mo 2 CT x thin‐film devices are shown to be relatively stable under ambient conditions, continuous illumination and mechanical stresses, illustrating their durable photodetection operation in the visible spectral range. Micro‐Raman spectroscopy conducted on bare Mo 2 CT x film and on gold electrodes allowing for surface‐enhanced Raman scattering demonstrates surface chemistry and a specific low‐frequency band that is related to the vibrational modes of the single nanosheets. The specific ability to detect and excite individual surface plasmon modes provides a viable platform for various MXene‐based optoelectronic applications.