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首页> 外文期刊>RSC Advances >The unusual visible photothermal response of free standing multilayered films based on plasmonic bimetallic nanocages
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The unusual visible photothermal response of free standing multilayered films based on plasmonic bimetallic nanocages

机译：基于等离子体双金属纳米分析的自由站多层薄膜的异常可见光热响应

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摘要

An optical phenomena based on the incident light absorption and transduction to the detectable thermal signal by plasmonic bimetallic Ag and Au nanocages (Ag@AuNCs) has been researched on free standing layer-by-layer (LbL) films of poly(vinyl alcohol) (PVA) and poly(vinyl pyrrolidone) (PVPON), (PVA/PVPON_Ag@AuNCs). Unlike well-studied monometallic Au nanocages (NCs), which possess a photothermal response in the near-infrared region, the bimetallic nanocages show a pronounced photothermal response in the visible range (532 nm) and near-infrared range (780 nm) due to the presence of two characteristic peaks at both wavelength ranges. The photothermal response in the visible range (532 nm) is distinguishable. Specifically increasing the laser power to 100 mW led to visual burning of the free standing film (temperature increased greater than >150 degrees C). The photothermal response by (PVA/PVPON_Ag@AuNCs)(n) films increases in proportion to the number (n) of bilayers (bl). It also increases as the molar concentration of the Ag@AuNCs introduced to the PVPON layer is increased. Therefore the molar concentration of the plasmonic Ag@AuNCs in (PVA/PVPON_Ag@AuNCs)(n) films is a primary factor that affects the photothermal dynamic response along with Ag@AuNCs distribution. This is supposed to result from the Ag@AuNCs assembled in a layer that leads to electromagnetic field enhancement. The unusual observation in multilayered (PVA/PVPON_Ag@AuNCs)(n) films is that the UV-visible spectra (extinction efficiency) and photothermal response (T-max) do not rely on the content of the adjacent layer of PVA and show a comparable (by value in magnitude) photothermal response at a different PVA composition of 2 mg ml(-1) and 20 mg ml(-1) at the same Ag@AuNCs concentration in the PVPON layer.
机译：通过等离子体Bimetallic Ag和Au nanocage（Ag @ auncs）的自由站 - 逐层（Lbl）的聚（乙烯醇）（乙烯醇）（乙烯醇）薄膜（）研究基于入射光吸收和转导的光学现象PVA）和聚（乙烯基吡咯烷酮）（PVPON），（PVA / PVPON_AG @ Auncs）。与具有近红外区域的光热响应具有光热响应的良好研究的单数金属响应不同，双金属纳米病人在可见范围（532nm）和近红外范围（780nm）中显示出明显的光热响应。两个波长范围的两个特征峰的存在。可见范围（532nm）中的光热响应是可区分的。具体地将激光功率增加到100mW导致自由膜的视觉燃烧（温度增加大于> 150℃）。通过（PVA / PVPON_AG @ Auncts）（N）膜的光热响应与双层（BL）的数量（N）成比例地增加。随着引入PVPON层的AG @ Auncs的摩尔浓度，它也增加了它也增加。因此，（PVA / PVPON_AG @ Auncts）（n）膜中的Plasmonic Ag @ auncs的摩尔浓度是影响光热动态响应以及Ag @ Auncs分布的主要因素。这应该是由组装在导致电磁场增强的层中的AG @ Aunc。多层（PVA / PVPON_AG @ Auncts）（N）薄膜的异常观察是UV可见光谱（消光效率）和光热响应（T-MAX）不依赖于PVA的相邻层的含量并显示a在PVPON层中相同的Ag @ auncs浓度在2mg ml（-1）和20mg ml（-1）的不同PVA组合物中的相当（按大幅值）的光热响应。

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