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Hydrophobic Paper-Based SERS Sensor Using Gold Nanoparticles Arranged on Graphene Oxide Flakes
- Source :
- Sensors, Volume 19, Issue 24, Sensors (Basel, Switzerland)
- Publication Year :
- 2019
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2019.
-
Abstract
- Paper-based surface-enhanced Raman scattering (SERS) sensors have garnered much attention in the past decade owing to their ubiquity, ease of fabrication, and environmentally friendly substrate. The main drawbacks of a paper substrate for a SERS sensor are its high porosity, inherent hygroscopic nature, and hydrophilic surface property, which reduce the sensitivity and reproducibility of the SERS sensor. Here, we propose a simple, quick, convenient, and economical method for hydrophilic to hydrophobic surface modification of paper, while enhancing its mechanical and moisture-resistant properties. The hydrophobic paper (h-paper) was obtained by spin-coating diluted polydimethylsiloxane (PDMS) solution onto the filter paper, resulting in h-paper with an increased contact angle of up to &asymp<br />130&deg<br />To complete the h-paper-based SERS substrate, gold nanoparticles arranged on graphene oxide (AuNPs@GO) were synthesized using UV photoreduction, followed by drop-casting of AuNPs@GO solution on the h-paper substrate. The enhancement of the SERS signal was then assessed by attaching a rhodamine 6G (R6G) molecule as a Raman probe material to the h-paper-based SERS substrate. The limit of detection was 10 nM with an R2 of 0.966. The presented SERS sensor was also tested to detect a thiram at the micromolar level. We expect that our proposed AuNPs@GO/h-paper-based SERS sensor could be applied to point-of-care diagnostics applications in daily life and in spacecraft.
- Subjects :
- Materials science
Nanotechnology
02 engineering and technology
01 natural sciences
Biochemistry
Article
Analytical Chemistry
law.invention
Rhodamine 6G
Contact angle
chemistry.chemical_compound
symbols.namesake
law
Electrical and Electronic Engineering
Instrumentation
Polydimethylsiloxane
Graphene
010401 analytical chemistry
Substrate (chemistry)
021001 nanoscience & nanotechnology
Atomic and Molecular Physics, and Optics
gold nanoparticles arranged on graphene oxide flakes (AuNPs@GO)
0104 chemical sciences
chemistry
Colloidal gold
symbols
hydrophobic paper
Surface modification
graphene oxide
0210 nano-technology
Raman spectroscopy
surface-enhanced Raman scattering (SERS)
Subjects
Details
- Language :
- English
- ISSN :
- 14248220
- Database :
- OpenAIRE
- Journal :
- Sensors
- Accession number :
- edsair.doi.dedup.....c700c4ea44f809d282b201f6254b196b
- Full Text :
- https://doi.org/10.3390/s19245471