Atomic/molecular layer deposition of europium–organic thin films on nanoplasmonic structures towards FRET-based applications,Nanoscale

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Atomic/molecular layer deposition of europium–organic thin films on nanoplasmonic structures towards FRET-based applications
Nanoscale ( IF 5.8 ) Pub Date : 2023-09-18 , DOI: 10.1039/d3nr04094a
Amr Ghazy ₁ , Jonas Ylönen ₂ , Nagarajan Subramaniyam ₂ , Maarit Karppinen ₁

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We present a novel atomic/molecular layer deposition (ALD/MLD) process for europium–organic thin films based on Eu(thd)₃ and 2-hydroxyquinoline-4-carboxylic acid (HQA) precursors. The process yields with appreciably high growth rate luminescent Eu-HQA thin films in which the organic HQA component acts as a sensitizer for the red Eu³⁺ luminescence, extending the excitation wavelength range up to ca. 400 nm. We moreover deposit these films on nanoplasmonic structures to achieve a twentyfold enhanced emission intensity. Finally, we demonstrate the FRET-type energy transfer process for our Eu-HQA coated nanoplasmonic structures in combination with commercial Alexa647 fluorophor, underlining their potential towards novel bioimaging applications.

中文翻译：

纳米等离子体结构上铕有机薄膜的原子/分子层沉积，用于基于 FRET 的应用

我们提出了一种基于 Eu(thd) ₃和 2-羟基喹啉-4-羧酸 (HQA) 前体的铕有机薄膜的新型原子/分子层沉积 (ALD/MLD) 工艺。该过程产生了相当高的生长速率发光Eu-HQA薄膜，其中有机HQA成分充当红色Eu ³⁺发光的敏化剂，将激发波长范围扩展至约100nm 。400纳米。此外，我们将这些薄膜沉积在纳米等离子体结构上，以实现发射强度提高二十倍。最后，我们展示了 Eu-HQA 涂层纳米等离子体结构与商业 Alexa647 荧光团相结合的 FRET 型能量转移过程，强调了它们在新型生物成像应用中的潜力。

更新日期：2023-09-18

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