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Epitaxial Graphene ...
Epitaxial Graphene Sensors Combined with 3D-Printed Microfluidic Chip for Heavy Metals Detection
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- Santangelo, Francesca (författare)
- Linköpings universitet,Sensor- och aktuatorsystem,Tekniska fakulteten
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- Shtepliuk, Ivan (författare)
- Linköpings universitet,Halvledarmaterial,Tekniska fakulteten
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- Filippini, Daniel (författare)
- Linköpings universitet,Sensor- och aktuatorsystem,Tekniska fakulteten
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- Puglisi, Donatella (författare)
- Linköpings universitet,Sensor- och aktuatorsystem,Tekniska fakulteten
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- Vagin, Mikhail, 1976- (författare)
- Linköpings universitet,Fysik och elektroteknik,Tekniska fakulteten
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- Yakimova, Rositsa (författare)
- Linköpings universitet,Halvledarmaterial,Tekniska fakulteten
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- Eriksson, Jens (författare)
- Linköpings universitet,Sensor- och aktuatorsystem,Tekniska fakulteten
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(creator_code:org_t)
- 2019-05-25
- 2019
- Engelska.
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Ingår i: Sensors. - : MDPI. - 1424-8220. ; 19:10
- Relaterad länk:
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https://doi.org/10.3...
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https://liu.diva-por... (primary) (Raw object)
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https://www.mdpi.com...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- In this work, we investigated the sensing performance of epitaxial graphene on Si-face 4H-SiC (EG/SiC) for liquid-phase detection of heavy metals (e.g., Pb and Cd), showing fast and stable response and low detection limit. The sensing platform proposed includes 3D-printed microfluidic devices, which incorporate all features required to connect and execute lab-on-chip (LOC) functions. The obtained results indicate that EG exhibits excellent sensing activity towards Pb and Cd ions. Several concentrations of Pb2+ solutions, ranging from 125 nM to 500 mu M, were analyzed showing Langmuir correlation between signal and Pb2+ concentrations, good stability, and reproducibility over time. Upon the simultaneous presence of both metals, sensor response is dominated by Pb2+ rather than Cd2+ ions. To explain the sensing mechanisms and difference in adsorption behavior of Pb2+ and Cd2+ ions on EG in water-based solutions, we performed van-der-Waals (vdW)-corrected density functional theory (DFT) calculations and non-covalent interaction (NCI) analysis, extended charge decomposition analysis (ECDA), and topological analysis. We demonstrated that Pb2+ and Cd2+ ions act as electron-acceptors, enhancing hole conductivity of EG, due to charge transfer from graphene to metal ions, and Pb2+ ions have preferential ability to binding with graphene over cadmium. Electrochemical measurements confirmed the conductometric results, which additionally indicate that EG is more sensitive to lead than to cadmium.
Ämnesord
- NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
Nyckelord
- heavy metals detection; epitaxial graphene; high sensitivity; 3D-printed flow cell; reusable lab-on-chip
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Sensors
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