Reusable Surface-Enhanced Raman Spectroscopy Membranes and Textiles via Template-Assisted Self-Assembly and Micro/Nanoimprinting,ACS Applied Materials & Interfaces

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Reusable Surface-Enhanced Raman Spectroscopy Membranes and Textiles via Template-Assisted Self-Assembly and Micro/Nanoimprinting
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-12-06 , DOI: 10.1021/acsami.0c16351
Aditya Garg ₁ , Wonil Nam ₁ , Wei Zhou ₁

Affiliation

Surface-enhanced Raman spectroscopy (SERS) has emerged as a powerful tool for ultrasensitive fingerprint recognition of molecules with considerable potential in wearable biochemical sensing. However, previous efforts to fabricate wearable SERS devices by directly treating fabrics with plasmonic nanoparticles have generated a nonuniform assembly of nanoparticles, weakly adsorbed on fabrics via van der Waals forces. Here, we report the creation of washing reusable SERS membranes and textiles via template-assisted self-assembly and micro/nanoimprinting approaches. Uniquely, we employ the capillary force driven self-assembly process to generate micropatch arrays of Au nanoparticle (NP) aggregates within hydrophobic microstructured templates, which are then robustly bonded onto semipermeable transparent membranes and stretchable textiles using the UV-resist based micro/nanoimprinting technique. A mild reactive ion etching (RIE) treatment of SERS membranes and textiles can physically expose the SERS hotspots of Au NP-aggregates embedded within the polymer UV resist for further improvement of their SERS performance. Also, we demonstrate that the semipermeable transparent SERS membranes can keep the moisture content of meat from evaporating to enable stable in situ SERS monitoring of biochemical environments at the fresh meat surface. By contrast, stretchable SERS textiles can allow the spreading, soaking, and evaporation of solution analyte samples on the fabric matrix for continuous enrichment of analyte molecules at the hotspots in biochemical SERS detection. Due to the mechanical robustness of the UV-resist immobilized Au NP aggregates, simple detergent-water washing with ultrasound sonication or mechanical stirring can noninvasively clean contaminated hot spots to reuse SERS textiles. Therefore, we envision that washing reusable SERS membranes and textiles by template-assisted self-assembly and micro/nanoimprinting fabrication are promising for wearable biochemical sensing applications, such as wound monitoring and body fluid monitoring.

中文翻译：

通过模板辅助自组装和微/纳米压印可重复使用的表面增强拉曼光谱膜和纺织品

表面增强拉曼光谱（SERS）已成为一种强大的工具，可以对可穿戴生物化学传感领域中具有巨大潜力的分子进行超灵敏指纹识别。然而，先前通过用等离子体纳米颗粒直接处理织物来制造可穿戴SERS装置的努力已经产生了纳米颗粒的不均匀组装，该纳米颗粒通过范德华力微弱地吸附在织物上。在这里，我们报告通过模板辅助的自组装和微/纳米压印方法创建了可洗涤的SERS膜和纺织品的洗涤方法。独特地，我们采用毛细管力驱动的自组装过程在疏水微结构模板中生成Au纳米粒子（NP）聚集体的微补丁阵列，然后使用基于紫外线抗蚀剂的微/纳米压印技术将其牢固地粘合到半透性透明膜和可拉伸纺织品上。对SERS膜和纺织品进行温和的反应离子刻蚀（RIE）处理可以物理暴露嵌入在聚合物UV抗蚀剂中的金NP聚集体的SERS热点，以进一步改善SERS性能。同样，我们证明了半透性透明SERS膜可以防止肉的水分蒸发，从而能够对新鲜肉表面的生化环境进行稳定的原位SERS监测。相比之下，可拉伸的SERS纺织品可以使溶液分析物样品在织物基质上散布，浸泡和蒸发，从而在生化SERS检测中在热点处连续富集分析物分子。由于固定有抗紫外线剂的Au NP聚集体的机械强度，使用超声波超声或机械搅拌进行简单的洗涤剂-水洗涤可以无创地清洁受污染的热点，以重新使用SERS纺织品。因此，我们设想通过模板辅助自组装和微/纳米压印加工来洗涤可重复使用的SERS膜和纺织品对于可穿戴生物化学传感应用（如伤口监测和体液监测）很有希望。

更新日期：2020-12-16

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