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Fiber‐Optic Photoacoustic Generator Realized by Inkjet‐Printing of CNT‐PDMS Composites on Fiber End Faces
Author(s) -
Oser Patrick,
Jehn Johannes,
Kaiser Michael,
Düttmann Oliver,
Schmid Fabian,
SchulteSpechtel Levin,
Rivas Sergio Sánchez,
Eulenkamp Constanze,
Schindler Christina,
Grosse Christian U.,
Wu Datong
Publication year - 2021
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.202000563
Subject(s) - materials science , polydimethylsiloxane , composite material , optical fiber , multi mode optical fiber , laser , penetration depth , carbon nanotube , optoelectronics , optics , physics
In recent years, photoacoustic generators based on multiwalled carbon nanotubes (MWCNT) and polydimethylsiloxane (PDMS) are manufactured in a variety of ways, which influences the properties of the generators with respect to frequency bandwidth, sound wave pressure, robustness, and reproducibility. Due to the high optical absorption of MWCNTs and the high thermal expansion coefficient of PDMS, this combination is ideally suited for use as a photoacoustic generator. This study presents a novel method to produce photoacoustic generators based on long‐term stable MWCNT and PDMS inks with a high reproducibility by means of inkjet‐printing. The MWCNT‐PDMS layers (thicknesses of 2–4 µm), printed directly onto the distal end face of a multimode glass fiber, show a good homogeneity and low optical transmission (19–21%). After the preparation of the fiber pieces, the inkjet printer performs all steps automatically in a time period of 30–60 s per layer. The generated ultrasonic pressure (0.39–0.54 MPa) and frequency bandwidth (1.5–12.7 MHz) can be measured at a distance of ≈4 mm with a laser fluency of 12.7 mJ cm −2 . These highly reproducible printed photoacoustic generators can be well used for nondestructive material testing and medical applications.