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Ultrasonic photoacoustic emitter of graphene-nanocomposites film on a flexible substrate
ID
Vella, Daniele
(
Author
),
ID
Mrzel, Aleš
(
Author
),
ID
Drnovšek, Aljaž
(
Author
),
ID
Shvalya, Vasyl
(
Author
),
ID
Jezeršek, Matija
(
Author
)
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MD5: 32287DC19909D1FB42F1A927212BE3E4
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https://www.sciencedirect.com/science/article/pii/S2213597922000787
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Abstract
Photoacoustic devices generating high-amplitude and high-frequency ultrasounds are attractive candidates for medical therapies and on-chip bio-applications. Here, we report the photoacoustic response of graphene nanoflakes – Polydimethylsiloxane composite. A protocol was developed to obtain well-dispersed graphene into the polymer, without the need for surface functionalization, at different weight percentages successively spin-coated onto a Polydimethylsiloxane substrate. We found that the photoacoustic amplitude scales up with optical absorption reaching 11 MPa at ~ 228 mJ/cm$^2$ laser fluence. We observed a deviation of the pressure amplitude from the linearity increasing the laser fluence, which indicates a decrease of the Grüneisen parameter. Spatial confinement of high amplitude (> 40 MPa, laser fluence > 55 mJ/cm$^2$) and high frequency (Bw-6db ~ 21.5 MHz) ultrasound was achieved by embedding the freestanding film in an optical lens. The acoustic gain promotes the formation of cavitation microbubbles for moderate fluence in water and in tissue-mimicking material. Our results pave the way for novel photoacoustic medical devices and integrated components.
Language:
English
Keywords:
ultrasonic photoacoustic composite
,
photoacoustic materials
,
laser ultrasonics
,
photoacoustic lens
,
acoustic cavitation
,
graphene-polydimethylsiloxane composite
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2022
Number of pages:
10 str.
Numbering:
Vol. 28, art. 100413
PID:
20.500.12556/RUL-142079
UDC:
534
ISSN on article:
2213-5979
DOI:
10.1016/j.pacs.2022.100413
COBISS.SI-ID:
126257667
Publication date in RUL:
19.10.2022
Views:
521
Downloads:
255
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Record is a part of a journal
Title:
Photoacoustics
Publisher:
Elsevier
ISSN:
2213-5979
COBISS.SI-ID:
519718169
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
kompoziti
,
fotoakustični materiali
,
laserski ultrazvoki
,
fotoakustične leče
,
akustična kavitacija
Projects
Funder:
Other - Other funder or multiple funders
Funding programme:
Ministrstvo za izobraževanje, znanost in šport
Acronym:
LASPRO
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0392
Name:
Optodinamika
Funder:
ARRS - Slovenian Research Agency
Project number:
L2-1833
Name:
Lasersko vzbujena podpovršinska mikrodestrukcija tkiva (LasDes)
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0082
Name:
Tankoplastne strukture in plazemsko inženirstvo površin
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-2509
Name:
Samoorganizacija plazme v razelektritvah magnetronskega naprševanja
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