Epitaxial Graphene Sensors Combined with 3D Printed Microfluidic Chip for Heavy Metals Detection

Proceedings

Santangelo, Maria Francesca¹  Yakimova, Rositsa²  Filippini, Daniel³  Puglisi, Donatella⁴  Eriksson, Jens⁵  Shtepliuk, Ivan⁶ 

[1] Applied Sensors Science, Department of Physics, Chemistry, and Biology—IFM, Linköping University, S-58183 Linköping, Sweden;Author to whom correspondence should be addressed.;GraphenSiC AB, SE-58330 Linköping, Sweden;Optical Devices Laboratory, Department of Physics, Chemistry, and Biology—IFM, Linköping University, S-58183 Linköping, Sweden;Presented at the Eurosensors 2018 Conference, Graz, Austria, 9–12 September 2018.;Semiconductor Materials, Department of Physics, Chemistry, and Biology—IFM, Linköping University, S-58183 Linköping, Sweden

关键词: heavy metals detection;    epitaxial graphene;    high sensitivity;    3D printed flow cell;    reusable lab-on-chip;   

DOI  :  10.3390/proceedings2130982

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

Two-dimensional materials may constitute key elements in the development of a sensing platform where extremely high sensitivity is required, since even minimal chemical interaction can generate appreciable changes in the electronic state of the material. In this work, we investigate the sensing performance of epitaxial graphene on Si-face 4H-SiC (EG/SiC) for liquid-phase detection of heavy metals (e.g., Pb). The integration of preparatory steps needed for sample conditioning is included in the sensing platform, exploiting fast prototyping using a 3D printer, which allows direct fabrication of a microfluidic chip incorporating all the features required to connect and execute the Lab-on-chip (LOC) functions. It is demonstrated that interaction of Pb2+ ions in water-based solutions with the EG enhances its conductivity exhibiting a Langmuir correlation between signal and Pb2+ concentration. Several concentrations of Pb2+ solutions ranging from 125 nM to 500 µM were analyzed showing good stability and reproducibility over time.

【 授权许可】

CC BY