Abstract. Polydimethylsiloxane/multi-walled carbon nanotube (PDMS/MWCNT) composite had high photoacoustic transduction efficiency owing to its high light absorption coefficient and low interfacial thermal resistance. The high expansion coefficient and light absorption ability of PDMS/MWCNT nanocomposite films have significant positive effects when it is used as a laser ultrasonic transducer. We introduce an ultrasonic-assisted forced impregnation method for the preparation of PDMS/MWCNT nanocomposite films. PDMS was used as the matrix phase, and MWCNTs were used as the nano-supporting framework. PDMS matrix was introduced into the MWCNT framework by the forced impregnation method. The morphology, thermal, and mechanical properties of the nanocomposite film were analyzed systematically. The photoacoustic conversion efficiency was researched through both experiment and simulation methods. The output sound pressure of our PDMS/MWCNT nanocomposite film reached 7.59 MPa when applied as an ultrasonic transducer under the pulsed laser excitation of 1 mJ / pulse energy. The photoacoustic conversion efficiency of our sample was 9.98 × 10 − 4, three times higher than similar products reported before, which offered the possibility to greatly enhance the photoacoustic signals.

中文翻译：

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超声辅助强制浸渍法制备聚二甲基硅氧烷/多壁碳纳米管纳米复合薄膜，光声转换效率高达9.98×10−4

摘要。聚二甲基硅氧烷/多壁碳纳米管（PDMS/MWCNT）复合材料由于其高光吸收系数和低界面热阻而具有高光声转换效率。PDMS/MWCNT纳米复合薄膜的高膨胀系数和光吸收能力在用作激光超声换能器时具有显着的积极作用。我们介绍了一种用于制备 PDMS/MWCNT 纳米复合薄膜的超声波辅助强制浸渍方法。PDMS用作基质相，MWCNTs用作纳米支撑框架。通过强制浸渍方法将 PDMS 基质引入到 MWCNT 框架中。系统地分析了纳米复合薄膜的形貌、热学和机械性能。通过实验和模拟两种方法研究了光声转换效率。在1 mJ/脉冲能量的脉冲激光激发下，我们的PDMS/MWCNT纳米复合薄膜作为超声换能器的输出声压达到7.59 MPa。我们样品的光声转换效率为 9.98 × 10 - 4，是之前报道的同类产品的三倍，这为大大增强光声信号提供了可能性。