Physics

Geology

Nanotechnology

Organic chemistry

Analytical Chemistry (journal)

Optics

Transition metal

Oceanography

Engineering

Catalysis

Raman scattering

Composite material

Chemistry

Materials science

Methylene

Substrate (aquarium)

Molybdenum disulfide

Molecule

Raman spectroscopy

Chemical vapor deposition

Chemical engineering

Optoelectronics

Two-dimensional (2D) molybdenum ditelluride (MoTe 2 ) is a member of the transition-metal dichalcogenides family, which is an especially promising platform for surface-enhanced Raman scattering (SERS) applications, due to its excellent electronic properties. However, the synthesis of large-area highly crystalline 2D MoTe 2 with controllable polymorphism is a huge challenge due to the small free energy difference (∼40 meV per unit cell) between semiconducting 2H-MoTe 2 and semi-metallic 1 T′-MoTe 2 . Herein, we report an optimized route for the synthesis of 2H- and 1 T′-MoTe 2 films by atmospheric-pressure chemical vapor deposition. The SERS study of the as-grown MoTe 2 films was carried out using methylene blue (MB) as a probe molecule. The Raman enhancement factor on 1 T′-MoTe 2 was found to be three times higher than that on 2H-MoTe 2 and the 1 T′-MoTe 2 film is an efficient Raman-enhancing substrate that can be used to detect MB at nanomolar concentrations. Our study also imparts knowledge on the significance of a suitable combination of laser excitation wavelength and molecule-material platform for achieving ultrasensitive SERS-based chemical detection.

Atmospheric-pressure CVD growth of two-dimensional 2H- and 1 T′-MoTe<sub>2</sub> films with high-performance SERS activity

Atmospheric-pressure CVD growth of two-dimensional 2H- and 1 T′-MoTe2 films with high-performance SERS activity

Atmospheric-pressure CVD growth of two-dimensional 2H- and 1 T′-MoTe₂ films with high-performance SERS activity