From Octahedron Crystals to 2D Silicon Nanosheets : Facet-Selective Cleavage and Biophotonic Applications

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
View graph of relations

Author(s)

  • Ziqiang Cheng
  • Haodong Cui
  • Quanlan Xiao
  • Hao Huang
  • Yihong Kang
  • Qian Liu
  • Jiahong Wang
  • Xue-Feng Yu

Detail(s)

Original languageEnglish
Article number2003594
Journal / PublicationSmall
Volume16
Issue number45
Online published20 Oct 2020
Publication statusPublished - 12 Nov 2020

Abstract

2D silicon nanosheets (SiNSs) are promising materials for biomedicine but facile synthesis of SiNSs remains a challenge. Herein, by means of a sulfur-iodine co-assisted chemical vapor transport method, octahedron silicon (oct-Si) crystals with fully exposed {111} planes are prepared as precursors for efficient synthesis of SiNSs by facet-selective exfoliation. The 13 nm thick SiNSs have good biocompatibility and the sharp Raman scattering signal facilitates intracellular Raman imaging upon exposure to a near-infrared (NIR) laser. Furthermore, the SiNSs have excellent NIR photothermal characteristics such as a large extinction coefficient of 11.3 L g−1 cm−1 and high photothermal conversion efficiency of 21.4% at 1064 nm. In vitro experiments demonstrate superior NIR-II photothermal therapeutic effects in killing cancer cells. Comparing to conventional methods, the novel facet-selective cleavage strategy is more controllable and environmentally friendly boding well for the fabrication of non-van der Waals 2D materials. The multimodal photonic behavior also suggests large potential of the SiNSs pertaining to integrated multi-NIR biophotonic techniques using single nanomaterials.

Research Area(s)

  • 2D materials, chemical vapor transport, photothermal conversion, Raman scattering, silicon nanosheets

Citation Format(s)

From Octahedron Crystals to 2D Silicon Nanosheets : Facet-Selective Cleavage and Biophotonic Applications. / Cheng, Ziqiang; Cui, Haodong; Xiao, Quanlan; Huang, Hao; Kang, Yihong; Liu, Qian; Wang, Jiahong; Chu, Paul K.; Yu, Xue-Feng.

In: Small, Vol. 16, No. 45, 2003594, 12.11.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review