Reduction in thermal conductivity of monolayer WS2 caused by substrate effect

Unusual Defect-Related Room-Temperature Emission from WS2 Monolayers Synthesized through a Potassium-Based Precursor

“…It was seen that only the full width at half-maximum (FWHM) of the A 1g band showed a tentative link to the strength of emission, as displayed in Figure S4. This band originates from out-of-plane vibrations of the chalcogen atoms in the lattice, with a wider band in principle linked to reduced phonon lifetimes . It is additionally interesting to note that such a relationship is not seen with either the 2LA­(M) or E 2g bandwidths.…”

A colloidal route to semiconducting tungsten disulfide nanosheets with monolayer thickness

“…38,39 In this way, frequency values for the E 1 2g (355-357 cm −1 ) and A 1g (416-418 cm −1 ) modes and a mode separation (A 1g -E 1 2g ) of 60 cm −1 -62 cm −1 have been determined for the WS 2 monolayer using laser excitation (479-647 nm). 38,39,42 Our sample shows the 2LA(M), E 1 2g , and A 1g modes centered at 350.1 cm −1 , 355.5 cm −1 , and 415.3 cm −1 , a relative shift of A 1g -E 1 2g modes of 59.8 cm −1 and a linewidth of 11.9 cm −1 , 5.6 cm −1 , and 9.8 cm −1 , respectively, using a 532 nm excitation laser. The literature reports similar frequency values for the E 1 2g (356-358 cm −1 ) and A 1g (416-418 cm −1 ) modes and (A 1g -E 1 2g ) = 60.1-61.2 cm −1 in mechanically exfoliated 38 and CVD 42,43 monolayer samples using also 532 nm excitation, indicating that the values obtained for our samples are compa- tible with the monolayer thickness.…”

“…38,39,42 Our sample shows the 2LA(M), E 1 2g , and A 1g modes centered at 350.1 cm −1 , 355.5 cm −1 , and 415.3 cm −1 , a relative shift of A 1g -E 1 2g modes of 59.8 cm −1 and a linewidth of 11.9 cm −1 , 5.6 cm −1 , and 9.8 cm −1 , respectively, using a 532 nm excitation laser. The literature reports similar frequency values for the E 1 2g (356-358 cm −1 ) and A 1g (416-418 cm −1 ) modes and (A 1g -E 1 2g ) = 60.1-61.2 cm −1 in mechanically exfoliated 38 and CVD 42,43 monolayer samples using also 532 nm excitation, indicating that the values obtained for our samples are compa- tible with the monolayer thickness. We point out that our mode separation is slightly smaller than what is expected for a monolayer; however, our values are inside the experimental error.…”

Realization of low potential barrier in MoS2/rGO heterojunction with enhanced electrical conductivity for thin film thermoelectric applications

“…is specific heat capacity and ( ) u w is the square of the group velocity [21]. The reduced A g 1 mode indicates the vibration along the interlayer bonding which affects the phonon transport.…”