High Pressure Induced in Situ Solid-State Phase Transformation of Nonepitaxial Grown Metal@Semiconductor Nanocrystals

Muwei Ji; Hongzhi Wang; Yu Gong; Haixia Cheng; Lirong Zheng; Xinyuan Li; Liu Huang; Jia Liu; Zhihua Nie; Qiaoshi Zeng; Meng Xu; Jiajia Liu; Xiaoxu Wang; Ping Qian; Caizhen Zhu; Jin Wang; Xiaodong Li; Jiatao Zhang

doi:10.1021/acs.jpclett.8b03057

High Pressure Induced in Situ Solid-State Phase Transformation of Nonepitaxial Grown Metal@Semiconductor Nanocrystals

J Phys Chem Lett. 2018 Nov 15;9(22):6544-6549. doi: 10.1021/acs.jpclett.8b03057. Epub 2018 Nov 5.

Authors

Muwei Ji^{1

2

3}, Hongzhi Wang¹, Yu Gong⁴, Haixia Cheng⁵, Lirong Zheng⁴, Xinyuan Li¹, Liu Huang¹, Jia Liu¹, Zhihua Nie¹, Qiaoshi Zeng^{6

7}, Meng Xu¹, Jiajia Liu¹, Xiaoxu Wang⁸, Ping Qian⁵, Caizhen Zhu², Jin Wang³, Xiaodong Li⁴, Jiatao Zhang¹

Affiliations

¹ Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering , Beijing Institute of Technology , Beijing , 100081 , P. R. China.
² School of Chemistry and Environmental Engineering , Shenzhen University , Shenzhen , 518055 , P. R. China.
³ Graduate School at Shenzhen , Tsinghua University , Shenzhen , 518055 , P. R. China.
⁴ Institute of High Energy Physics , The Chinese Academy of Sciences , Beijing , 100049 , P. R. China.
⁵ Department of Physics , University of Science and Technology Beijing , Beijing 100083 , P. R. China.
⁶ HPSynC, Geophysical Laboratory , Carnegie Institution of Washington , Argonne , Illinois 60439 , United States.
⁷ Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Shanghai 201203 , P. R. China.
⁸ Department of Cloud Platform , Beijing Computing Center , Beijing 100094 , P. R. China.

PMID: 30384608
DOI: 10.1021/acs.jpclett.8b03057

Abstract

Considering the large lattice mismatch induced interface strain between nonepitaxial grown monocrystalline semiconductor shell and metal core, we studied the solid-state phase transformation of such nonepitaxial grown Au@CdS core/shell NCs under high pressure in this paper. Consistent with HRTEM characterizations, the high resolution Raman spectra and synchrotron angle-dispersive X-ray diffraction (ADXRD) spectra evolution were utilized to investigate the hydrostatic pressure (0-24 GPa) induced gradual phase transformation. Due to the strong lattice interactions between Au core and CdS shell, the different behavior and improved stability under high pressure appeared compared to single quantum dots (QDs).