Abstract
Since evaluating CA 19-9 antigen level in human serum is crucial for the early diagnosis of a vast range of diseases, especially pancreatic cancer, applying a simple, rapid, and sensitive detection method is essential. We employed an electrolyte-gated field-effect transistor with MoS2 nanosheets channel as an immunosensor to recognize CA 19-9 tumor marker. In order to obtain MoS2 nanosheets and use them as a semiconducting channel, the liquid phase exfoliation method was performed. Later, the MoS2 channel surface was modified by covalent immobilization of antibody 19-9. Electrical measurements revealed the depletion mode n-type behavior of MoS2 nanosheets with the FET mobility of 0.02 cm2 V-1 s-1, current on/off ratio of 883.96, and the subthreshold swing of 795.54 mV/decade. Due to the n-type behavior of the MoS2-based FET immunosensor, with increasing the concentration of the CA 19-9 antigen at a wide linear concentration range from 1.0×10-12 U/ml to 1.0×10-4 U/ml, the source-drain current decreased and low detection limit of 2.8×10-13 U/ml was obtained. The designed MoS2-based FET immunosensor, owning high selectivity, performed accurately for trace amounts of real human serum samples. The remarkable properties of this immunosensor enable the diagnosis of pancreatic cancer in the early stages, which increases the chance of curing this disease.
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Acknowledgements
We thank the Vice President for Research and Technology of Ministry of Science, Research, and Technology of Iran for support of Samira Mansouri Majd postdoctoral program [grant number: 3/294449]. The research office of University of Kurdistan is also acknowledged.
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Rahmani, H., Majd, S.M. & Salimi, A. Highly sensitive and selective detection of the pancreatic cancer biomarker CA 19-9 with the electrolyte-gated MoS2-based field-effect transistor immunosensor. Ionics 29, 3769–3779 (2023). https://doi.org/10.1007/s11581-023-05136-2
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DOI: https://doi.org/10.1007/s11581-023-05136-2