screen-printed molybdenum disulfide electrodes for electrochemical sensing of dopamine

Abstract

Two-dimensional (2D) molybdenum disulphide (MoS2) belongs to a class of materials called transition metal dichalcogenides (TMDCs).Due to its large surface area, high biocompatibility, non-zero band-gap, structural versatility and mechanical flexibility, MoS2 can be used for next-generation sensing devices.In this work, printable high viscosity inks containing MoS2 in various ratios and ethyl cellulose (EC) as a binder were prepared.The effect of different MoS2 concentrations was investigated by measuring inks rheological properties.Structural and chemical properties of electrodes were studied by optical microscopy and SEM/EDX analysis.In addition, prepared MoS2/EC inks were screen-printed onto fluorine-doped tin oxide (FTO) coated glass substrates to develop working electrodes for electrochemical sensing of dopamine.Finally, differential pulse voltammetry measurements by applying FTO/MoS2 sensors showed that dopamine's limit of detection (LOD) was below the micromolar level.This work marks to the potential for fast, simple and mass printing production of MoS2 sensors to detect further target analytes.