Facile synthesis of boron- and nitride-doped MoS₂ nanosheets as fluorescent probes for the ultrafast, sensitive, and label-free detection of Hg²⁺

Abstract

Bulk MoS2, a prototypical transition metal chalcogenide material, is an indirect band gap semiconductor with negligible photoluminescence. In this study, we have developed, for the first time, a simple and low-cost synthetic strategy to prepare boron- and nitrogen-doped MoS2 (B,N-MoS2) nanosheets. Through boron and nitrogen doping, the band gap of MoS2 increases from 1.20 eV to 1.61 eV, and the obtained B,N-MoS2 nanosheets exhibit an enhanced fluorescence. The B,N-MoS2 nanosheets can be used as a green and facile sensing platform for label-free detection of Hg(2+) because of their high sensitivity and selectivity toward Hg(2+). In addition, detection can be easily accomplished through one-step rapid (within 2 min) operation, with a limit as low as 1 nM. This study demonstrates that the introduction of boron and nitrogen elements into ultrathin MoS2 nanosheets for enhanced fluorescence properties is feasible through a facile and general preparation strategy and may also offer a unique idea as a potential way to design more efficient MoS2-based sensors and fluorescent materials.

Synthesis and Characterization of Two-Dimensional Transition Metal Dichalcogenide Magnetic MoS2@Fe3O4 Nanoparticles for Adsorption of Cr(VI)/Cr(III)

“…11,15,24 Moreover, the very sharp peak of high intensity and strong peak of XRD spectra further confirm a well-stacked crystalline structure. 9,11,20,24 Apparently, MoS 2 @Fe 3 O 4 NPs exhibited peaks at 2θ = 29.2, 30.3, 32.9, 33.7, 35.7, 39.8, 44.4, 50.0, 57.2, and 58.5° (Figure 2D). Two new weak diffraction peaks emerge from the low-angle region, where 32° corresponds to the (100) plane of the pristine 2H-MoS 2 , indicating the formation of MoS 2 @Fe 3 O 4 NPs.…”

“…19,23 For the bulk MoS 2 sample, two characteristic Raman peaks are attributed to 390 and 416 cm –1 , which correspond to the A 1g and 1 E 2g vibration modes (Figure 1B). 11,15,20 Related peak frequency difference is Δ k = 26 cm –1 . However, as-synthesized MoS 2 @Fe 3 O 4 NP peaks were slightly shifted to 392 and 417 cm –1 , which correspond to the A 1g and 1 E 2g vibration modes (Figure 1C).…”

Recent Advances in Sensing Applications of Two‐Dimensional Transition Metal Dichalcogenide Nanosheets and Their Composites

“…Chemical doping in 2D nanomaterials could change their band gap and thus affect their optical properties . Bearing this in mind, Feng et al developed a sonication method to prepare boron‐ and nitrogen‐co‐doped MoS 2 (B,N–MoS 2 ) nanosheets . Through the co‐doping of boron and nitrogen, they found that the band gap of MoS 2 nanosheets increased from 1.20 to 1.61 eV and the synthesized B,N–MoS 2 nanosheets possessed an enhanced fluorescence.…”

Application of N‐Doped MoS2 Nanocrystals for Removal of Azo Dyes in Wastewater

“…In the past decades, the modification of MoS 2 nanocrystals has been widely investigated . For example, nitrogen‐doped MoS 2 nanocrystals (NDMN) have found extensive application in electrical and optical fields, due to their better optoelectronic properties than pristine MoS 2 . However, to the best of the authors' knowledge, no literature has reported on the application of NDMN towards azo dyes removal.…”