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Resolving Nanocomposite Interfaces via Simultaneous Submicrometer Optical‐Photothermal Infrared‐Raman Microspectroscopy
Author(s) -
Wang Alexander J.,
Dillon Eoghan P.,
Maharjan Surendra,
Liao KangShyang,
McElhenny Brian P.,
Tong Tian,
Chen Shuo,
Bao Jiming,
Curran Seamus A.
Publication year - 2021
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202001720
Subject(s) - materials science , raman spectroscopy , nanocomposite , photothermal therapy , carbon nanotube , infrared , hyperspectral imaging , quantum cascade laser , characterization (materials science) , nanotechnology , optics , optoelectronics , physics , remote sensing , terahertz radiation , geology
Nanocomposite materials are assuming increasingly important roles across contemporary materials science. Analytical characterizations and visualizations of nanoscale interphases/interfaces are critical to development of novel multiphase nanostructures and nanoscale systems. While conventional vibrational spectroscopies are indispensable physicochemical characterization tools, standard techniques such as Fourier‐transform and quantum cascade laser infrared (IR) microspectroscopies are intrinsically limited in spatial resolution by the wavelength‐dependent diffraction limit of IR light ( ≈ 5–12 µ m). Optical‐photothermal infrared (O‐PTIR) with simultaneous hyperspectral Raman microspectroscopy (O‐PTIR + R) is a novel all‐optical technique that circumvents such diffraction limits, yielding position‐specific IR spectra with sub‐micrometer wavelength‐independent resolution across the mid‐IR. This work implements single‐frequency O‐PTIR with concomitant hyperspectral Raman microspectroscopy to resolve interfacial regions in a poly(octadecyl acrylate)‐ grafted ‐multiwall carbon nanotube (PODA‐ g ‐MWCNT) nanocomposite for wearable temperature sensors and highlights how the O‐PTIR + R technique can be used for analytical characterization and visualization of other nanocomposite systems below resolution limitations of conventional IR spectroscopies.