Citation: WU Hao, YAN Zhong. Antimonene Quantum Dots: Large-scale Synthesis via Liquid-phase Exfoliation[J]. Acta Physico-Chimica Sinica, ;2019, 35(10): 1052-1057. doi: 10.3866/PKU.WHXB201801262 shu

Antimonene Quantum Dots: Large-scale Synthesis via Liquid-phase Exfoliation

WU Hao ,
YAN Zhong ^,

College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

Corresponding author: YAN Zhong, zhongyan@njust.edu.cn
Received Date: 27 December 2017
Revised Date: 23 January 2018
Accepted Date: 23 January 2019
Available Online: 26 October 2018
Fund Project: the Natural Science Foundation of Jiangsu Province, China 20150761the China Postdoctoral Science Foundation 2015M580429The project was supported by the National Natural Science Foundation of China (51502140), the Natural Science Foundation of Jiangsu Province, China (20150761), the China Postdoctoral Science Foundation (2015M580429) and the Jiangsu Postdoctoral Science Foundation, China (1501013A)The project was supported by the National Natural Science Foundation of China 51502140the Jiangsu Postdoctoral Science Foundation, China 1501013A

Since the rediscovery of black phosphorus as a fascinating two-dimensional material, other two-dimensional materials comprising group V_A elements have attracted tremendous interest, such as antimonene. Since 2015, besides intensive research efforts on the atomic structures, electronic properties and synthesis methods of antimonene, scientists have conducted applied researches on semiconductor and nonlinear optical devices, molecular adsorption and thermoelectric applications based on antimonene. In addition, antimonene quantum dots (SbQDs) as derivatives of antimonene, have also been studied recently, and their potential applications in photothermal therapy have been reported. To further explore the unique properties and potential applicationsof SbQDs, it is important tosynthesize large amounts of high-quality SbQDs. In this work, antimonene samples were prepared by sonication-assisted liquid exfoliation method. Antimony powders (200 mg) were dispersed in 200 mL water, C₂H₅OH and 1-methyl-2-pyrrolidone (NMP) solvents separately and sonicated for 10 h at a power of 180 W. Thereafter, the suspensions were centrifuged at 6000 r∙min^-1 for 20 min, and the supernatant containing antimonene samples were decanted and characterized. The dispersion concentration of antimonene samples in the three solvents (water, C₂H₅OH and NMP) were measured as 0.57, 1.04, and 4.27 µg∙mL^-1, respectively. However, the antimonene concentrations in water, C₂H₅OH and NMP dropped by 73.7%, 30.8% and 10.5%, respectively, after standing for 96 h. Thus, antimonene dispersed in NMP demonstrated the highest concentration and best stability, which indicates that NMP is more suitable for antimonene exfoliation. Furthermore, transmission electron microscopy (TEM) studies revealed that only the samples prepared in NMP were morphologically quantum dots, while antimonene samples obtained in the other two solvents were mainly nanosheets. The obtained SbQDs in NMP had a lateral size of approximately 3.0 nm. High-resolution transmission electron microscope (HRTEM) also confirmed the good crystal quality of theobtained SbQDs. In addition, we measured the turbidities of antimonene dispersed in those three solvents at various concentrations. As theoretically predicted, the turbidity of antimonne dispersions linearly depends on the concentraion; thus, the antimonene concentrations can be calculated by measuring the turbidity through an optical method. Thus, this study provides a high-throughput, nondestructive method for determining antimonene dispersion concentration, which will faciliate further research in this area.
- Antimonene,
- Quantum dots,
- Liquid exfoliation,
- Turbidimetry,
- Dispersibility
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