In most studies, liquid-exfoliated tungsten disulfide quantum dots (WS₂ QDs) were synthesized at pH∼4 (acidic) and generally unstable. Therefore, a figment synthesis technique for creating stable WS₂ QDs is essential. Here, functionalized blue fluorescent WS₂ QDs were fabricated with a single-step hydrothermal growth method at pH∼11 without any subsequent modifications. Functional groups in the WS₂ QDs give great stability, water dispersibility, and significant photoluminescence (PL) which depends on excitation wavelength. PL shows a multiexponential decay, probably as a result of the overlap of emissions from different emitting states. The absorption and PL of WS₂ QDs were extremely sensitive to hydrogen peroxide (H₂O₂) in water. The absorption and PL of WS₂ QDs quenched strongly and linearly with increasing H₂O₂ concentration from 0.33 nM to 594 µM. The quenching of both absorption and PL by H₂O₂ recovered nearly 100 % by adding 0.1 N HCl. The PL quenching/recovery showed cyclic stability for more than nine cycles, and the limit of detection (LoD) of H₂O₂ was estimated to be 1.7 × 10^-6 M. The oxidation from W(IV) to W(VI) and subsequent reduction are considered to induce quenching of absorption/PL and recovery. PL decay profiles of WS₂ QDs were also measured, and excited-state dynamics of the emitting state of WS₂ QDs in the presence of H₂O₂ have been discussed. Thus, the fluorescent WS₂ QDs having significant emission quantum yield can detect H₂O₂ with excellent cyclic stability and sensitivity in an aqueous environment, which will be further used for biological applications.

在大多数研究中，液体剥离的二硫化钨量子点 (WS ₂ QD) 是在 pH ~ 4（酸性）下合成的，通常不稳定。因此，用于创建稳定的 WS ₂ QD 的虚构合成技术是必不可少的。在这里，功能化的蓝色荧光 WS ₂ QD 是在 pH ~ 11 下采用一步水热生长方法制造的，没有任何后续修改。_{WS 2} QD中的官能团具有出色的稳定性、水分散性和显着的光致发光 (PL)，这取决于激发波长。PL 显示多指数衰减，可能是由于不同发射状态的排放重叠。_{WS 2}的吸收和PLQD 对水中的过氧化氢 (H ₂ O ₂ ) 极其敏感。随着 H ₂ O ₂浓度从 0.33 nM 增加到 594 µM ，WS ₂ QD的吸收和 PL强烈地线性猝灭。通过添加 0.1 N HCl ，H ₂ O ₂对吸收和 PL 的淬灭几乎恢复了 100%。PL 淬灭/恢复显示循环稳定性超过 9 个循环，H ₂ O ₂的检测限 (LoD)估计为 1.7 × 10 ^-6 M。从 W(IV) 到 W(VI) 的氧化和随后的还原被认为会引起吸收/PL 和恢复的猝灭。WS 的 PL 衰减曲线还测量了₂ QD，并且讨论了在存在 H ₂ O _{2的情况下 WS 2} QD 的发射态的激发态动力学。因此，具有显着发射量子产率的荧光WS _{2 QDs可以在水环境中以优异的循环稳定性和灵敏度检测H 2} O ₂，​​这将进一步用于生物学应用。