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Epitaxial Graphene Sensors Combined with 3D-Printed Microfluidic Chip for Heavy Metals Detection
Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensor- och aktuatorsystem. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensor- och aktuatorsystem. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensor- och aktuatorsystem. Linköpings universitet, Tekniska fakulteten.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, nr 10, artikkel-id 2393Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
MDPI, 2019. Vol. 19, nr 10, artikkel-id 2393
Emneord [en]
heavy metals detection; epitaxial graphene; high sensitivity; 3D-printed flow cell; reusable lab-on-chip
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Identifikatorer
URN: urn:nbn:se:liu:diva-158818DOI: 10.3390/s19102393ISI: 000471014500180PubMedID: 31130608Scopus ID: 2-s2.0-85066922488OAI: oai:DiVA.org:liu-158818DiVA, id: diva2:1337693
Merknad

Funding Agencies|Swedish Foundation for Strategic research (SSF) [GMT14-0077, RMA15-024]; Angpanneforeningens Forskningsstiftelse [16-541]

Tilgjengelig fra: 2019-07-16 Laget: 2019-07-16 Sist oppdatert: 2019-08-14bibliografisk kontrollert

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Santangelo, FrancescaShtepliuk, IvanFilippini, DanielPuglisi, DonatellaVagin, MikhailYakimova, RositsaEriksson, Jens
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