title: Nanocomposites of Molybdenum Disulfide/Methoxy Polyethylene Glycol-co-Polypyrrole for Amplified Photoacoustic Signal.
abstract: 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-co-polypyrrole copolymer (mPEG-co-PPyr) nanoparticles (NPs) and mPEG-co-PPyr NP/molybdenum disulfide (mPEG-co-PPyr/MoS2) nanocomposites (NCs) were prepared and their photoacoustic activity was demonstrated. The mPEG-co-PPyr NPs and mPEG-co-PPyr/MoS2NCs both showed photoacoustic signal activity. The mPEG-co-PPyr/MoS2NCs presented a higher photoacoustic signal amplitude at 700 nm than the mPEG-co-PPyr NPs. The enhanced photoacoustic activity of the mPEG-co-PPyr/MoS2NCs might be attributed to heterogeneous interfacial contact between mPEG-co-PPyr and the MoS2nanosheets due to complex formation. Laser ablation of MoS2might elevate the local temperature and facilitate the thermal conductive transfer in the mPEG-co-PPyr/MoS2NCs, amplifying PA signal. Our study, for the first time, demonstrates enhanced PA activity in SP/transition metal disulfide (TMD) composites as photoacoustic nanoplatforms.
authors.forename: Hohyeon
authors.initials: H
authors.lastname: Lee
authors.forename: Haemin
authors.initials: H
authors.lastname: Kim
authors.affiliation: School of Chemical Engineering and Material Science, Chung-Ang University , 221 Heukseok-Dong, Dongjak-Gu, Seoul, Korea.
authors.forename: Thang Phan
authors.initials: TP
authors.lastname: Nguyen
authors.forename: Jin Ho
authors.initials: JH
authors.lastname: Chang
authors.affiliation: School of Chemical Engineering and Material Science, Chung-Ang University , 221 Heukseok-Dong, Dongjak-Gu, Seoul, Korea.
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Hyuncheol
authors.initials: H
authors.lastname: Kim
authors.affiliation: School of Chemical Engineering and Material Science, Chung-Ang University , 221 Heukseok-Dong, Dongjak-Gu, Seoul, Korea.
authors.forename: Eunah
authors.initials: E
authors.lastname: Kang
keywords: MoS2; nanocomposites; photoacoustics; polypyrrole; semiconductive π-conjugating polymers; transition metal disulfide