二硫化钼纳米薄片分散液的剥离制备

文中采用液相超声剥离粉末二硫化钼制备了纳米薄片分散液,通过紫外可见吸收光谱测定分散液的浓度,并探索了超声功率、超声时间以及二硫化钼初始浓度对纳米薄片分散液浓度的影响。实验结果表明,当超声功率为350 W,超声时间为48 h,二硫化钼初始浓度为10 mg/mL时,所制备的纳米薄片分散液浓度可达0.16 mg/mL。在剥离过程中加入聚乙烯吡咯烷酮,可以有效避免由于纳米薄片自身团聚而导致的分散液稳定性差的问题,所得到的二硫化钼纳米薄片分散液可稳定存放超过两个月;同时,PVP的加入可将二硫化钼纳米薄片分散液浓度提高至0.42 mg/mL。

Preparation of Liquid Exfoliation of MoS2 Nanosheets Dispersion

In this paper, nano-flaky dispersion was prepared by liquid exfoliation from bulk material. The concentration of the dispersion was determined by UV-Vis spectra, and the effects of ultrasonic power, ultrasonic time, initial concentration of molybdenum disulfide on the concentration of nano-flakes dispersion were explored. Experimental data showed that when the ultrasonic power was 350 W, the ultrasonic time was 48 h, and the initial concentration of molybdenum disulfide was 10 mg/mL, the concentration of the nano-flakes could reach 0.16 mg/mL. During the stripping process, the addition of PVP could effectively avoid the problem of poor stability of the dispersion due to self-agglomeration of the nanoflakes, and the resulting dispersion of molybdenum disulfide nanoflakes could be stably stored for more than two months. Meanwhile, the addition of PVP increased the concentration of MoS₂/PVP dispersion to 0.42 mg/mL.