Monolayer black phosphorus by sequential wet-chemical surface oxidation

Abstract

We report a straightforward chemical methodology for controlling the thickness of black phosphorus flakes down to the monolayer limit by layer-by-layer oxidation and thinning, using water as solubilizing agent.

Solvent exfoliation stabilizes TiS2 nanosheets against oxidation, facilitating lithium storage applications

“…While encapsulation and working inside a dry-box have been used to get around this problem, 20,31 a simpler solution would of course be welcome. Herein, we report, for the first time to our knowledge, the exfoliation and size selection of TiS 2 in an open atmosphere at room temperature in such a manner that degradation has been neutralized.…”

Robust Amphiphobic Few‐Layer Black Phosphorus Nanosheet with Improved Stability

“…With dispersing time increases, the absorbance intensity at 470 nm (A) decreases by 96.0% (as compared with the original value A 0 ) for FL-BP after 7 days, and 95.6% for FL-BP/AMPTS after 10 days (Figure 5e). For FL-BP/PFDTS, the absorbance intensity of FL-BP (9.0%), as well as the concentration of PO 4 3− (0.01 to 0.021) remain at the same level, even after 60 days. The result suggests the fast degradation of FL-BP and FL-BP/AMPTS in aqueous solution.…”

“…To further prove the improved stability of FL-BP/DDTS and FL-BP/PFDTS, UV-vis spectra are conducted to monitor the variation of FL-BP concentration, as well as corresponding PO 4 3− concentration ( Figure S15 in the Supporting Information for more details [37] ) during the degradation of FL-BP in aqueous solution. At initial stage, the same concentration (7 µg mL −1 ) of four samples dispersion gives the almost same UV-vis absorbance intensity at 470 nm.…”

Recent Advances in Chemical Functionalization of 2D Black Phosphorous Nanosheets

“…The thickness of a monolayer phosphorene is considered to be 0.53 nm . However, in practice the thickness may vary depending on the substrate used and whether it has been oxidized (Figure e,f) . AFM can provide further information about surface functionalization on BPNSs (an increase in thickness) and oxidative degradation by the loss of smooth surface morphology …”