[22p-P06-1~23] 17 Nanocarbon Technology(Poster)

▲ [22p-P06-20] A combined microfluidic system for selective and real-time detection of TCNQ and F4-TCNQ on the channel of atomic layer MoS₂ field effect transistor

〇(D)Md Nasiruddin¹, Kosei Takahashi¹, Hiroki Waizumi¹, Tsuyoshi Takaoka², Atsushi Ando³, Tadahiro Komeda² (1.Tohoku Univ., 2.IMRAM, Tohoku Univ., 3.AIST)

Keywords:Molybdenum disulfide, Microfluidic system

Molybdenum disulfide (MoS₂), one of the most fascinating transition metal dichalcogenides (TMDs) with tunable bandgap, is currently extensively investigated as an appropriate alternative of graphene due to its potentiality as an atomically thin channel material and viable prospects in the next decades for catalytical, electrical and optoelectronic applications^1,2. In this study, tetracyanoquinodimethane (TCNQ) and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) molecules were used to functionalize the MoS₂-FET microfluidic channel and by threshold voltage shifting on Id-Vg plots both molecules were shown to be electron acceptors. Furthermore, the back-and-forth behavior of Ids-Vg plots for the alternative addition of IPA solvent and molecular solution represent the switching sensor behavior of the of the fabricated MoS₂. The continuous real-time measurement of the MoS₂-FET was also performed during the alternative flow of molecular solutions (200uM) and pure IPA. It is seen that as soon as the molecular solution reaches the MoS₂ sensor signal starts to decrease indicating an electron transfer from the MoS₂ channel to the molecules.