Strain-gradient facilitated formation of confined Ge/GeO2 nanoparticles with a cracked shell and enhanced two-photon absorption

Cailei Yuan, Ying Zhang, Jun He, Shuangli Ye, Wen Lei, Xiaoshan Liu, Gang Gu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The formation of the cracked shell is confirmed by HRTEM for the Ge/GeO2 core/shell nanoparticles fabricated by the pulsed laser deposition method and a rapid thermal annealing technique. The determined two-photon absorption in Ge/GeO2 core/shell nanoparticles with a cracked shell is an instantaneous nonlinear process and is enhanced almost 2 times compared with that in pure Ge nanoparticles. Our simulation results illustrate that the oxidation of confined Ge/GeO2 core/shell nanoparticles results in the formation of cracks in GeO2 shells. It indicates that strain gradients induced in the confined GeO2 shell during the oxidation process can facilitate the formation of the cracked GeO2 shell and the shape evolution of Ge/GeO2 core/shell nanoparticles. These results demonstrate that the strain can manipulate the microstructure, morphology and optical properties of confined core/shell nanoparticles.
Original languageEnglish
Pages (from-to)8768-8772
JournalJournal of Materials Chemistry C
Volume2
Issue number41
DOIs
Publication statusPublished - 2014

Fingerprint Dive into the research topics of 'Strain-gradient facilitated formation of confined Ge/GeO2 nanoparticles with a cracked shell and enhanced two-photon absorption'. Together they form a unique fingerprint.

Cite this