Abstract
Surface-enhanced Raman spectroscopy (SERS) is an optical technique for molecule identification. However, fabrication of flexible and structured SERS substrates for performance improvement in a facile and cost-effective manner is challenging. In this work, we reported a polytetrafluoroethylene (PTFE)-based flexible SERS substrate by femtosecond laser direct writing (FsLDW) technology. The femtosecond laser-treated PTFE surface is 3D hierarchical micro-/nano-structures, and the structured PTFE-based SERS chip shows excellent performance enhancement. As a result, 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-7</sup> M can be detected, which shows excellent potentials in developing flexible SERS for wearable electronics.
Highlights
Surface-enhanced Raman spectroscopy (SERS) is an optical technique for molecule identification [1]–[5] and shows distinguished advantages in chemical and biological analytics [6]–[10]
We reported a polytetrafluoroethylene (PTFE)-based flexible SERS substrate by femtosecond laser direct writing (FsLDW) technology
The micro-/nano-structures on the untreated PTFE surface maybe originate from debris that splashed on untreated areas during the interaction between Fs laser and PTFE
Summary
Surface-enhanced Raman spectroscopy (SERS) is an optical technique for molecule identification [1]–[5] and shows distinguished advantages in chemical and biological analytics [6]–[10]. To improve SERS performance, various SERS substrates with micro-/nano-structures have been developed based on EM field enhancement mechanism. There have been developed various SERS substrates with micro-/nano-structures for performance improvement [26]–[31]. Bai et al prepared periodic surface structures for SERS chip by femtosecond laser (Fs) assisted wet etching [53]. We proposed a polytetrafluoroethylene (PTFE) based flexible SERS substrates with hierarchical micro-/nano structures by Fs laser direct writing (FsLDW) technology. PTFE shows excellent heat, acid, and alkali resistance, having abroad applications in power, automotive, and aerospace industries [57]–[59].Flexible SERS chips were prepared by silver nanoparticles thermal evaporation on the structured PTFE substrates. Because of the hybrid micro-/nano-structures on PTFE membranes, the SERS chip shows high performance by enhancing the internal light reflection and the LSPR
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
