1 research outputs found
Nanocomposites of Molybdenum Disulfide/Methoxy Polyethylene Glycol-<i>co</i>-Polypyrrole for Amplified Photoacoustic Signal
Photoacoustic activity is the generation
of an ultrasonic signal
via thermal expansion or bubble formation, stimulated by laser irradiation.
Photoacoustic nanoplatforms have recently gained focus for application
in bioelectric interfaces. Various photoacoustic material types have
been evaluated, including gold nanoparticles, semiconductive π-conjugating
polymers (SP), etc. In this study, surfactant-free methoxy-polyethylene
glycol-<i>co</i>-polypyrrole copolymer (mPEG-<i>co</i>-PPyr) nanoparticles (NPs) and mPEG-<i>co</i>-PPyr NP/molybdenum
disulfide (mPEG-<i>co</i>-PPyr/MoS<sub>2</sub>) nanocomposites
(NCs) were prepared and their photoacoustic activity was demonstrated.
The mPEG-<i>co</i>-PPyr NPs and mPEG-<i>co</i>-PPyr/MoS<sub>2</sub> NCs both showed photoacoustic signal activity.
The mPEG-<i>co</i>-PPyr/MoS<sub>2</sub> NCs presented a
higher photoacoustic signal amplitude at 700 nm than the mPEG-<i>co</i>-PPyr NPs. The enhanced photoacoustic activity of the
mPEG-<i>co</i>-PPyr/MoS<sub>2</sub> NCs might be attributed
to heterogeneous interfacial contact between mPEG-<i>co</i>-PPyr and the MoS<sub>2</sub> nanosheets due to complex formation.
Laser ablation of MoS<sub>2</sub> might elevate the local temperature
and facilitate the thermal conductive transfer in the mPEG-<i>co</i>-PPyr/MoS<sub>2</sub> NCs, amplifying PA signal. Our study,
for the first time, demonstrates enhanced PA activity in SP/transition
metal disulfide (TMD) composites as photoacoustic nanoplatforms