ABSTRACT

Surface architecture belonging to flora and fauna is preferred because of their unique three dimensional micro/nanostructures, which can be utilised as novel support in SERS based chemical detection. In this work, we have fabricated biomimetic SERS substrates by replicating the wings of two different beetles with interesting surface morphology by employing soft lithography technique. Micro-bowls and nanogaps between globular microstructures on the replicated artificial wings surface have been utilised for aggregation of nanoparticles to create electromagnetic hot spots and enhanced interaction of nanoparticles with analyte molecules. The surface of these substrates has been engineered to form a homo-nanojunction between gold thin film and gold nanoparticles, which makes it more SERS active. The remarkable performance of these nano-junction based substrates was examined for SERS based sensitive detection of an organic dye, methylene blue, and a fungicide, carbendazim. This work paves way for the design and development of substrates using biomimetic approaches.

摘要

属于动植物的表面结构是首选，因为它们具有独特的三维微/纳米结构，可用作基于 SERS 的化学检测的新载体。在这项工作中，我们通过采用软光刻技术复制具有有趣表面形态的两种不同甲虫的翅膀来制造仿生 SERS 基板。复制的人造机翼表面上的球状微结构之间的微碗和纳米间隙已被用于纳米粒子的聚集，以产生电磁热点并增强纳米粒子与分析物分子的相互作用。这些基板的表面经过精心设计，可在金薄膜和金纳米颗粒之间形成同质纳米结，使其更具 SERS 活性。这些基于纳米结的基底的显着性能被用于基于 SERS 的有机染料亚甲蓝和杀菌剂多菌灵的灵敏检测。这项工作为使用仿生方法设计和开发基板铺平了道路。