An ion-selective crown ether covalently grafted onto chemically exfoliated MoS2 as a biological fluid sensor.
Anastasios StergiouChristina StangelRuben Canton-VitoriaRyo KitauraNikos TagmatarchisPublished in: Nanoscale (2021)
We describe the basal plane functionalization of chemically exfoliated molybdenum disulfide (ce-MoS2) nanosheets with a benzo-15-crown-5 ether (B15C5), promoted by the chemistry of diazonium salts en route to the fabrication and electrochemical assessment of an ion-responsive electrode. The success of the chemical modification of ce-MoS2 nanosheets was investigated by infrared and Raman spectroscopy, and the amount of the incorporated crown ether was estimated by thermogravimetric analysis. Raman spatial mapping at on-resonance excitation allowed us to disclose the structural characteristics of the functionalized B15C5-MoS2 nanosheets and the impact of basal plane functionalization to the stabilization of the 1T phase of ce-MoS2. Morphological investigation of the B15C5-MoS2 hybrid was implemented by atomic force microscopy and high-resolution transmission electron microscopy. Furthermore, fast-Fourier-transform analysis and in situ energy dispersive X-ray spectroscopy revealed the crystal lattice of the modified nanosheets and the presence of crown-ether addends, respectively. Finally, B15C5-MoS2 electrodes were constructed and evaluated as ion-selective electrodes for sodium ions in aqueous solution and an artificial sweat matrix.
Keyphrases
- quantum dots
- reduced graphene oxide
- energy transfer
- high resolution
- gold nanoparticles
- ionic liquid
- atomic force microscopy
- transition metal
- visible light
- raman spectroscopy
- highly efficient
- room temperature
- high speed
- electron microscopy
- aqueous solution
- solid state
- mass spectrometry
- tandem mass spectrometry
- carbon nanotubes
- magnetic resonance imaging
- wastewater treatment
- gas chromatography mass spectrometry
- cancer therapy
- computed tomography