Low-defectiveness exfoliation of MoS₂ nanoparticles and their embedment in hybrid light-emitting polymer nanofibers

Abstract

MoS2 nanoparticles are obtained through a highly gentle exfoliation method and are embedded in polymer nanofibers to make them light-emitting.

Activation Strategy of MoS2 as HER Electrocatalyst through Doping-Induced Lattice Strain, Band Gap Engineering, and Active Crystal Plane Design

“…The frequency spacing between the two modes (at ∼30 cm −1 ) showed that the MoS 2 consisted of 7 to 12 layers. 43,44 Interestingly, it was observed that the intensity ratio of the two modes in each spectrum is ∼0.5, which confirmed that doping occurs in a homogenous manner in MoS 2 . 45,46 However, the absolute intensity decreased with subsequent doping with dopant atoms as the number of Mo−S bonds decreased, which again confirmed the change in the lattice constant upon doping.…”

“…Generally, the frequency difference of 18 cm –1 between the E 1 2g and A 1g modes suggested a multilayer signature. The frequency spacing between the two modes (at ∼30 cm –1 ) showed that the MoS 2 consisted of 7 to 12 layers. , Interestingly, it was observed that the intensity ratio of the two modes in each spectrum is ∼0.5, which confirmed that doping occurs in a homogenous manner in MoS 2 . , However, the absolute intensity decreased with subsequent doping with dopant atoms as the number of Mo–S bonds decreased, which again confirmed the change in the lattice constant upon doping . In addition, the shift in peak toward higher frequency supported the successful n-type doping in MoS 2 crystal lattice as evidenced by the Mott–Schottky analysis, which implied that the V and N atoms are located at the Mo and S substitutional sites, respectively, similar to the case of p/n type doping. , …”

“…In addition, a few peaks that appeared at λ max values of 685, 612, 435, and 350 nm were the characteristic absorption bands for pure MoS 2 . Two distinctive peaks at λ max values of 612 and 690 nm appeared due to the K point of the Brillouin zone (K4 → K5 and K1 → K5 transitions, respectively), whereas the peaks at λ max values of 350 and 435 nm were recognized to the direct transition of the conduction band from the inner valence band. ,, The appearance of A and B excitons is due to the interlayer interaction and spin–orbit splitting, with a certain splitting value of approximately 60 nm (0.17 eV). , The absorption spectra of MoS 2 , VMS, NMS, and VNMS exhibited a shoulder ranging from 380 to 270 nm, which were attributed as interband electronic excitation from occupied dz 2 orbital to unoccupied orbitals . The doped systems depicted a comparable pattern with MoS 2 supported by the second order derivative of absorption with respect to wavelength (λ), i.e., d­(OD) 2 /dλ 2 against λ of the respective samples (Figure S2).…”

“…Two distinctive peaks at λ max values of 612 and 690 nm appeared due to the K point of the Brillouin zone (K4 → K5 and K1 → K5 transitions, respectively), whereas the peaks at λ max values of 350 and 435 nm were recognized to the direct transition of the conduction band from the inner valence band. 25,26,43 The appearance of A and B excitons is due to the interlayer interaction and spin−orbit splitting, with a certain splitting value of approximately 60 nm (0.17 eV). 50,51 The absorption spectra of MoS 2 , VMS, NMS, and VNMS exhibited a shoulder ranging from 380 to 270 nm, which were attributed as interband electronic excitation from occupied dz 2 orbital to unoccupied orbitals.…”

Promising performance of chemically exfoliated Zr-doped MoS2 nanosheets for catalytic and antibacterial applications

“…49 Upon doping with Zr, two absorptions band appeared at $557 and 613; peak at 557 nm can be attributed to nanosheets with lateral dimensions of a few tens of nm. 50 The peaks located at 613 nm signify-B direct excitonic-peak. 51 The above-stated results acquired from the analysis of MoS 2 nanosheets suggest quantum connement effect.…”