4.2 Article

Synthesis of laser-patterned MoS2 nanoneedles for advanced electrochemical sensing

Journal

MRS COMMUNICATIONS
Volume 13, Issue 4, Pages 554-560

Publisher

SPRINGER HEIDELBERG
DOI: 10.1557/s43579-023-00381-y

Keywords

Laser annealing; Laser-induced reaction; Nanostructure; Sensor

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We present a novel method using excimer laser to fabricate crystalline MoS2 nanoneedles. Laser annealing at a low energy density led to a closed-pack structure with low defects and excellent conductivity. Increasing the laser annealing energy density resulted in the formation of MoS2 nano-needles. The MoS2 nano-needles showed remarkable reduction ability for H2O2 and demonstrated low detection limit and high sensitivity.
We describe a novel excimer laser-based route for the fabrication of crystalline MoS2 nanoneedles. Laser annealing of MoS2 thin films at a low energy density of 0.08 Jcm(-2) resulted in a closed-pack structure with low defects and excellent conductivity due to melting and rapid quenching. A further increase in laser annealing energy density resulted in the formation of MoS2 nano-needles. This structure of MoS2 was found to have a remarkable reduction ability for H2O2 at - 0.14 V over a wide linear range; a low detection limit (0.45 nM (S/N = 3)) and sensitivity of 2.38 mu A/mM cm(-2) were demonstrated.

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