The crystal types of nanoparticles (NPs) are governed by many factors, such as temperature, pH, solvents, surface ligands, etc. In this work, β-HgS and α-HgS NPs coated with captopril (Cap) have been synthesized conveniently in the same raw materials and similar
methods just with different temperature at 4 °C and 50 °C, respectively. More interestingly, phase transition of HgS NPs from β-crystal (cubic crystal) to α-crystal (hexagonal crystal) via rising temperature from 4 to 50 °C was confirmed by X-ray powder
diffraction (XRD) and transmission electron microscopy (TEM). The size of α-HgS NPs grew to 6.7±1.3 nm in the process of phase transition, which was about twice of β-HgS NPs (3.5±1.0 nm). Furthermore, compared with the obvious absorption peak of β-HgS
NPs at 688 nm, the absorption peak of α-HgS NPs had a giant blue-shifted to 470 nm in Ultraviolet and visible (UV-vis) spectra. In addition, the β-HgS NPs had a fluorescence emission at 900 nm differing from α-HgS NPs without emission. The α-HgS
NPs had three peaks at 215 nm, 251 nm and 318 nm, while the β-HgS NPs had only a distinct peak at 215 nm in circular dichroism (CD) spectra. These results provide a novel insight for the controlling preparation of different crystal types of nanoparticles.
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Document Type: Research Article
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People’s Republic of China
School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, People’s Republic of China
Publication date: April 1, 2020
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