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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
Published on: September 23, 2018
Layer-by-layer fabrication of chemical-bonded graphene coating for solid-phase microextraction
Suling Zhang1, Zhuo Du, Gongke Li
1School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Analytical Chemistry
|August 24, 2011
Summary
A novel graphene-coated solid-phase microextraction (SPME) fiber offers enhanced stability and sensitivity for analyzing polycyclic aromatic hydrocarbons (PAHs). This new fiber provides significantly higher enrichment factors compared to traditional fibers, improving detection limits for environmental contaminants.
Area of Science:
- Analytical Chemistry
- Materials Science
- Environmental Science
Background:
- Solid-phase microextraction (SPME) is a widely used technique for sample preparation.
- Developing novel SPME fibers with improved stability and selectivity is crucial for trace analysis.
- Graphene's unique properties offer potential for advanced extraction materials.
Purpose of the Study:
- To develop a new fabrication strategy for a graphene-coated SPME fiber.
- To evaluate the performance of the graphene-coated SPME fiber for the analysis of polycyclic aromatic hydrocarbons (PAHs).
- To compare the efficiency of the new fiber with commercial SPME fibers.
Main Methods:
- Fabrication of graphene-coated SPME fiber using graphite oxide, 3-aminopropyltriethoxysilane (APTES), and hydrazine.
- Headspace (HS) SPME coupled with Gas Chromatography-Mass Spectrometry (GC/MS) for PAHs analysis.
- Selectivity studies involving various organic compounds to understand adsorption mechanisms.
Main Results:
- The graphene-coated fiber demonstrated excellent chemical stability, enduring over 150 extraction cycles.
- Significantly higher enrichment factors (EFs) were observed for PAHs compared to a commercial polydimethylsiloxane (PDMS) fiber, ranging from 2-fold for naphthalene to 17-fold for benzo(b)fluoranthene.
- The fiber exhibited good precision (<11%), low detection limits (1.52-2.72 ng/L), and wide linearity (5-500 ng/L) for PAHs analysis.
- Satisfactory recoveries were achieved when applied to real water (84-102%) and soil (72-95%) samples.
Conclusions:
- The in-situ synthesized graphene-coated SPME fiber offers a robust and highly efficient alternative for the determination of PAHs.
- The enhanced performance is attributed to the π-π stacking interaction and hydrophobic effects of graphene.
- This method provides a sensitive and reliable approach for environmental monitoring of PAHs in complex matrices.
