4.6 Article

2,2,6,6-Tetramethylpiperidine-1-oxy-Oxidized Cellulose Nanofiber-Based Nanocomposite Papers for Facile In Situ Surface-Enhanced Raman Scattering Detection

Journal

ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 18, Pages 15640-15647

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b03680

Keywords

surface-enhanced Raman scattering (SERS); TEMPO-oxidized cellulose nanofiber; transparent cellulose nanopaper; plasmonic nanocomposite; in situ detection; pesticide residue

Funding

  1. Cooperative Research Program for Agriculture Science and Technology Development Rural Development Administration [PJ0127972019]
  2. National Research Foundation of Korea (NRF) - Korean government (MSIP) [2018R1D1A1B07047874]
  3. Research/Publication Support Program - Ottogi Ham Taiho Foundation [2019]
  4. National Research Foundation of Korea [2018R1D1A1B07047874] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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In this study, we report a flexible transparent freestanding surface-enhanced Raman scattering (SERS) platform composed of 2,2,6,6-tetrarnethylpiperidine-1-oxy-oxidized cellulose nanofibers (TEMPO-CNF) and gold nanoparticles (AuNPs) such as nanospheres (AuNSs) and nanorods (AuNRs) for in situ chemical sensing of a real world surface. The TEMPO-CNF/AuNP-based nanocomposites were fabricated using two-step filtration with a pure TEMPO-CNF solution and a TEMPO-CNF/AuNP mixture solution. We demonstrate that the TEMPO-CNF/AuNR nanocomposite reveals better SERS activity than the TEMPO-CNF/AuNS nanocomposite. The TEMPO-CNF/AuNR nanocomposite detected rhodamine 6G down to 10 nM with a high enhancement factor of 2.1 X 10(7) and exhibited good SERS measurement reproducibility in the flexible/bent state. No significant change in SERS intensity was observed even after 1000 cycles of bending to nearly 90 degrees. Importantly, the flexible transparent TEMPO-CNF matrix allows the TEMPO-CNF/AuNR nanocomposite to be tightly wrapped onto the surface of an agricultural product for in situ detection as well as to directly detect pesticide residues down to 60 ng/cm(2), which is much lower than the maximum residue level for food safety. This high-performance SERS substrate based on a flexible transparent nanopaper for rapid in situ detection has great potential in various practical applications such as food safety and environmental monitoring.

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