AI Article Synopsis
- - Carbon nanotubes (CNT) modified with siloxane compounds were mixed into a solution with polystyrene and tetrahydrofuran to create thin films capable of producing strong ultrasound pulses when stimulated by pulsed lasers.
- - These films are highly efficient, absorbing over 99% of visible and near-infrared light and demonstrating resilience with no fatigue after thousands of laser applications.
- - The ultrasound waves produced have a wide bandwidth (170 MHz) and high peak pressures (>1 MPa), enabling precise imaging capabilities comparable to histological techniques, all while being non-invasive and real-time.
Article Abstract
Carbon nanotubes (CNT) functionalized with siloxane groups were dissolved in polystyrene/tetrahydrofuran to produce thin films that generate broadband and intense ultrasound pulses when excited by pulsed lasers. These films absorb >99% of light in the visible and near-infrared and show no signs of fatigue after thousands of laser pulses. Picosecond laser pulses with fluences of 50 mJ cm-2 generate photoacoustic waves with exceptionally wide bandwidths (170 MHz at -6 dB) and peak pressures >1 MPa several millimeters away from the source. The ability to generate such broadband ultrasound pulses is assigned to the ultrafast dissipation of heat by CNT-siloxanes, and to the formation of very thin photoacoustic sources thanks to the high speed of sound of polystyrene. The wide bandwidths achieved allow for axial resolutions of 8 μm at depths less than 1 mm, similar to the resolution of histology but based on real-time non-invasive methods.
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| http://dx.doi.org/10.1039/d0nr04986g | DOI Listing |
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