Optical characterization of DNA origami-shaped silver nanoparticles created through biotemplated lithography,Nanoscale

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Optical characterization of DNA origami-shaped silver nanoparticles created through biotemplated lithography
Nanoscale ( IF 5.8 ) Pub Date : 2022-06-13 , DOI: 10.1039/d1nr06256e
Kabusure M Kabusure ₁ , Petteri Piskunen ₂ , Jiaqi Yang ₁ , Mikko Kataja ₁ , Mwita Chacha ₁ , Sofia Ojasalo ₂ , Boxuan Shen _{2,

3} , Tommi K Hakala ₁ , Veikko Linko _{2,

4}

Affiliation

Here, we study optically resonant substrates fabricated using the previously reported BLIN (biotemplated lithography of inorganic nanostructures) technique with single triangle and bowtie DNA origami as templates. We present the first optical characterization of BLIN-fabricated origami-shaped silver nanoparticle patterns on glass surfaces, comprising optical transmission measurements and surface-enhanced Raman spectroscopy. The formed nanoparticle patterns are examined by optical transmission measurements and used for surface enhanced Raman spectroscopy (SERS) of Rhodamine 6G (R6G) dye molecules. Polarization-resolved simulations reveal that the higher SERS enhancement observed for the bowties is primarily due to spectral overlap of the optical resonances with the Raman transitions of R6G. The results manifest the applicability of the BLIN method and substantiate its potential in parallel and high-throughput substrate manufacturing with engineered optical properties. While the results demonstrate the crucial role of the formed nanogaps for SERS, the DNA origami may enable even more complex nanopatterns for various optical applications.

中文翻译：

通过生物模板光刻创建的 DNA 折纸形银纳米粒子的光学表征

在这里，我们研究了使用先前报道的 BLIN（无机纳米结构的生物模板光刻）技术制造的光学共振基板，其中单三角形和蝴蝶结 DNA 折纸作为模板。我们提出了玻璃表面上 BLIN 制造的折纸形银纳米颗粒图案的首次光学表征，包括光学透射测量和表面增强拉曼光谱。通过光学透射测量检查形成的纳米颗粒图案，并用于罗丹明 6G (R6G) 染料分子的表面增强拉曼光谱 (SERS)。偏振分辨模拟表明，对于蝴蝶结观察到的更高的 SERS 增强主要是由于光学共振与 R6G 的拉曼跃迁的光谱重叠。结果证明了 BLIN 方法的适用性，并证实了其在具有工程光学特性的并行和高通量基板制造中的潜力。虽然结果证明了形成的纳米间隙对 SERS 的关键作用，但 DNA 折纸可以使更复杂的纳米图案用于各种光学应用。

更新日期：2022-06-13

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