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Self-Assembled Microgels Arrays for Electrostatic Concentration and Surface-Enhanced Raman Spectroscopy Detection of Charged Pesticides in Seawater
- Source :
- Analytical chemistry. 91(17)
- Publication Year :
- 2019
-
Abstract
- Development of flexible surface-enhanced Raman spectroscopy (SERS) substrate with controllable "hot spots" has spurred increasing interest because of its unique structure and plasmonic properties. Here, charged poly(vinyl alcohol) microgels containing silver nanoparticles are developed by using microfluidic emulsification to produce a "smart" SERS sensor with charge screening and signals amplification. Importantly, this charged microgel enables the selective concentration of counter-charged molecules and induces the formation of assembled arrays at an immiscible liquid-liquid interface because of the electrostatic interaction. The SERS-active microgels arrays possess controllable structures and facilitate on-site determination of charged pesticides with an enhancement factor of 5.0 × 105. Such nanostructures present the ease of assembly, stability, and reproducibility which allow multiplex detection of analytes at aqueous and organic phases without any pretreatment of the complex matrix samples. The interfacial sensing platform for on-site SERS analysis of charged pesticides will open vast possibilities for a wide range of in-field applications.
- Subjects :
- Vinyl alcohol
Nanostructure
Silver
Surface Properties
Microfluidics
Static Electricity
Metal Nanoparticles
Nanotechnology
010402 general chemistry
Spectrum Analysis, Raman
01 natural sciences
Silver nanoparticle
Analytical Chemistry
chemistry.chemical_compound
symbols.namesake
Seawater
Particle Size
Pesticides
Plasmon
Microgels
010401 analytical chemistry
Substrate (chemistry)
Surface-enhanced Raman spectroscopy
Microfluidic Analytical Techniques
0104 chemical sciences
chemistry
Polyvinyl Alcohol
symbols
Raman spectroscopy
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 15206882
- Volume :
- 91
- Issue :
- 17
- Database :
- OpenAIRE
- Journal :
- Analytical chemistry
- Accession number :
- edsair.doi.dedup.....e11aab66f452a9a9daee63e14fe88377