Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 291, Issue -, Pages 369-377Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.04.077
Keywords
Paper-based sensor; Surface enhanced Raman scattering; Label-free detection; Au nanoparticle
Funding
- Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry (IPET) through the Advanced Production Technology Development Program of the Ministry of Agriculture, Food and Rural Affairs (MAFRA) [316080-04]
- Fundamental Research Program of the Korea Institute of Materials Science (KIMS) [PNK 6070]
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We introduce a facile and low-cost method for fabricating gold nanostructures on cellulose filter paper (CFP) to prepare a paper-based surface-enhanced Raman scattering (SEAS) sensor for label-free molecular detection. Polymerized dopamine (PD) was used as an adhesive layer on the CFP and simultaneously functioned as a reducing agent for gold nanoparticle (AuNP) nucleation. The size of the AuNPs was dependent on the pH of the gold precursor solution, and nanoparticles with an average size of 102 nm were formed on the PD-coated CFP at a pH 3, exhibiting high SEAS activity. Finite-difference time-domain (FDTD) simulations of the electromagnetic field enhancement of AuNPs with different sizes and interparticle distances were performed to identify the origin of the SEAS effect. The developed paper-based SEAS substrate showed uniform and excellent molecular sensitivity with a limit of detection (LOD) of 10(-7) M for methylene blue, as measured by a portable Raman spectrometer. Furthermore, as a field application test, surfaces of apples were pretreated with diquat (DQ) and paraquat (PQ) pesticides, which were then detected down to a concentration of 1 ppm after simple attachment of the sensor on the apple peels and performing a SEAS measurement. The developed paper-based SEAS sensor is expected to be applicable as a label-free sensor for a variety of chemical and biological molecules.
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