聚二甲基硅氧烷
材料科学
蜡烛
复合数
纳米颗粒
超声波
激光器
复合材料
烟灰
纳米技术
光学
声学
化学
燃烧
工程类
电气工程
物理
有机化学
作者
Muhammad Faraz,Muhammad Awais Abbasi,Pil Gyu Sang,Donghee Son,Hyoung Won Baac
出处
期刊:Micromachines
[MDPI AG]
日期:2020-06-28
卷期号:11 (7): 631-631
被引量:15
摘要
Considerable attention has been devoted to the development of nanomaterial-based photoacoustic transmitters for ultrasound therapy and diagnosis applications. Here, we fabricate and characterize candle-soot nanoparticles (CSNPs) and polydimethylsiloxane (PDMS) composite-based photoacoustic transmitters, based on a solution process, not just to achieve high-frequency and high-amplitude pressure outputs, but also to develop physically stretchable ultrasound transmitters. Owing to its non-porous and non-agglomerative characteristics, the composite exhibits unique photo-thermal and mechanical properties. The output pressure amplitudes from CSNPs-PDMS composites were 20-26 dB stronger than those of Cr film, used as a reference. The proposed transmitters also offered a center frequency of 2.44-13.34 MHz and 6-dB bandwidths of 5.80-13.62 MHz. Importantly, we characterize the mechanical robustness of CSNPs-PDMS quantitatively, by measuring laser-damage thresholds, to evaluate the upper limit of laser energy that can be ultimately used as an input, i.e., proportional to the maximum-available pressure output. The transmitters could endure an input laser fluence of 54.3-108.6 mJ·cm-2. This is 1.65-3.30 times higher than the Cr film, and is significantly higher than the values of other CSNPs-PDMS transmitters reported elsewhere (22-81 mJ·cm-2). Moreover, we characterized the strain-dependent photoacoustic output of a stretchable nanocomposite film, obtained by delaminating it from the glass substrate. The transmitter could be elongated elastically up to a longitudinal strain of 0.59. Under this condition, it maintained a center frequency of 6.72-9.44 MHz, and 6-dB bandwidth ranges from 12.05 to 14.02 MHz. We believe that the stretchable CSNPs-PDMS composites would be useful in developing patch-type ultrasound devices conformally adhered on skin for diagnostic and therapeutic applications.
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