Fabrication of luminescent PtS ₂ quantum dots

Platinum disulfide (PtS ₂ ), a member of the recently developed group 10 transition metal dichalcogenide (TMD) materials, exhibits great potential in optoelectronics applications. Nevertheless, its photoluminescence (PL) behavior still remains obscure. Quantum dots (QDs) are believed having the capability to enhance photoluminescence property compared to the bulky or layered structure owing to their quantum confinement effects. Inspired by remarkable PL enhancement works on other TMD materials QDs, the fabrication of PtS ₂ QDs suspension via a low-cost liquid exfoliation technique is demonstrated in this work. The PtS ₂ QDs with an average diameter of 3.9 nm and average thickness of 2.9 nm are observed, respectively. For the first time, the PL spectra of PtS ₂ QDs suspension are successfully obtained and monitored over time. The PL spectra display an excitation-dependent luminescence. The maximum emission peak is observed at 407.2 nm for the excitation wavelength of 330 nm. This PtS ₂ QDs also shows a decent long-term stability. These results open up encouraging prospects of luminescence applications of PtS ₂ QDs.