Flexible and reusable SERS substrate for rapid conformal detection of residue on irregular surface
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ORIGINAL RESEARCH
Flexible and reusable SERS substrate for rapid conformal detection of residue on irregular surface Jing Yang . Jiangtao Xu . Xueyan Bian . Yi Pu . Ka lam Chiu . Dagang Miao . Shouxiang Jiang
Received: 11 September 2020 / Accepted: 29 October 2020 Ó Springer Nature B.V. 2020
Abstract Surface-enhanced Raman scattering (SERS) is gaining prominence as a rapid and effective detection method. However, this technique is still challenged by reusability and sampling issues, especially on irregular surfaces. To address these obstacles, a flexible SERS substrate is designed in this study by using reduced graphene oxide (rGO) as the active material and cotton fabric as the substrate material. The cotton fabric is first modified with a silicane coupling agent before coating with rGO to enhance the adhesion between the rGO and cotton fabric, which would allow reusability of the substrate. The resultant SERS substrate shows a better performance with an enhancement factor of 8 9 103 and a calculated
sensitivity of 4.5 9 10-6 M, as well as excellent signal reproducibility with a relative standard deviation (RSD) of 4.72% and stability with RSD value of 5.47%. Meanwhile, the SERS substrate also demonstrates enhanced reusability, and retains strong Raman signals of the dye molecules even after 40 cycles of detection and washing process. The exceptional SERS performance, enhanced reusability, stability and signal reproducibility, along with other intrinsic advantages, such as low cost, ease of availability, and excellent flexibility, render the obtained SERS substrate in this study a promising product for detection in practical applications. Keywords SERS rGO Flexible substrate Cotton fabric Reusability
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03568-x) contains supplementary material, which is available to authorized users. Jing Yang and Jiangtao Xu have contributed equally to this work. J. Yang J. Xu X. Bian Y. Pu K. l. Chiu D. Miao S. Jiang (&) Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong, China e-mail: [email protected] D. Miao Industrial Research Institute of Nonwovens and Technical Textiles (IRINTT), College of Textiles and Clothing, Qingdao University, Shangdong, China
Introduction Surface-enhanced Raman scattering (SERS) is a powerful spectroscopic technique for molecular sensing and detecting as it greatly enhances the vibrational fingerprints of molecules without destruction (Zhang et al. 2019; Zheng et al. 2017). Therefore, SERS has been used in various tasks, such as for environmental monitoring (Shanta and Cheng 2017), food safety (Song et al. 2019), chemical or biomedical sensing (Fateixa et al. 2015; Qiu et al. 2017), and interfacial science. Generally speaking, electromagnetic
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Cellulose
enhancement (EM) and chemical enhancement (CM) are the two more well-known enhancement mechanisms that explain for the degree or inten
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