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Restaino, Stephen M.; White, Ian M.
Analytica chimica acta, 07/2019, Volume: 1060Journal Article
For decades surface enhanced Raman spectroscopy (SERS) has been intensely investigated as a possible solution for performing analytical chemistry at the point of sample origin. Unfortunately, due to cost and usability constraints, conventional rigid SERS sensors and microfluidic SERS sensors have yet to make a significant impact outside of the realm of academics. However, the recently introduced flexible and porous paper-based SERS sensors are proving to be widely adaptable to realistic usage cases in the field. In contrast to rigid and microfluidic SERS sensors, paper SERS sensors feature (i) the potential for roll-to-roll manufacturing methods that enable low sensor cost, (ii) simple sample collection directly onto the sensor via swabbing or dipping, and (iii) equipment-free separations for sample cleanup. In this review we argue that movement to paper-based SERS sensors will finally enable point-of-sample analytical chemistry applications. In addition, we present and compare the numerous fabrication techniques for paper SERS sensors and we describe various sample collection and sample clean-up capabilities of paper SERS sensors, with a focus on how these features enable practical applications in the field. Finally, we present our expectations for the future, including emerging ideas inspired by paper SERS. Display omitted •SERS sensors on paper offer one of the best opportunities for analytical chemistry in the field.•Paper SERS sensors have a lower production cost than conventional and microfluidic SERS sensors.•Paper SERS sensors innately offer simple sample collection and sample processing capabilities.•Emerging methods inspired by paper SERS sensors may offer unprecedented ease of use.
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