Au@HgxCd1-xTe core@shell nanorods by sequential aqueous cation exchange for near-infrared photodetectors

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

2 Scopus Citations
View graph of relations

Author(s)

  • Xinyuan Li
  • Muhammad Ahsan Iqbal
  • Meng Xu
  • Yi-Chi Wang
  • Hongzhi Wang
  • Muwei Ji
  • Xiaodong Wan
  • Thomas J.A. Slater
  • Jia Liu
  • Jiajia Liu
  • Hongpan Rong
  • Wenxing Chen
  • Stephen V. Kershaw
  • Sarah J. Haigh
  • Liming Xie
  • Jiatao Zhang

Detail(s)

Original languageEnglish
Pages (from-to)57-65
Journal / PublicationNano Energy
Volume57
Early online date11 Dec 2018
Publication statusPublished - Mar 2019

Abstract

We have explored the synthesis of Au@HgxCd1-xTe core@shell nanorods by sequential aqueous cation exchange (ACE) for near-infrared photodetector application. A number of related Au@telluride core/shell nanorod structures were put forwarded, taking advantage of multi-step transformations through a binary and then a ternary phase for the telluride shells. The latter have a high degree of crystallinity thanks to the step-wise ACE method. The use of only trace amounts of Cd2+ coordinated with tri-n-butylphosphine, assisted the phase transformation from an amorphous Ag2Te shell to a highly crystalline Ag3AuTe2 shell in the first stage; this was followed by a further cation exchange (CE) step with far higher Cd2+ levels to fabricate a highly crystalline CdTe shell, and with an additional CE with Hg2+ to convert it to a HgxCd1-xTe shell. The composition of the shell components and the well-controlled thickness of the shells enabled tunable surface plasmon resonance properties of the Au@telluride nanorods in the NIR region. Utilizing the enhanced NIR absorption, a hybrid photodetector structure of Au@HgxCd1-xTe nanorods on graphene was fabricated, showing visible to NIR (vis-NIR) broadband detection with high photoresponsivity (~106 A/W).

Research Area(s)

  • Cation exchange synthesis, Core/shell nanorods, Crystal phase engineering, Near-infrared photodetector

Citation Format(s)

Au@HgxCd1-xTe core@shell nanorods by sequential aqueous cation exchange for near-infrared photodetectors. / Li, Xinyuan; Iqbal, Muhammad Ahsan; Xu, Meng; Wang, Yi-Chi; Wang, Hongzhi; Ji, Muwei; Wan, Xiaodong; Slater, Thomas J.A.; Liu, Jia; Liu, Jiajia; Rong, Hongpan; Chen, Wenxing; Kershaw, Stephen V.; Haigh, Sarah J.; Rogach, Andrey L.; Xie, Liming; Zhang, Jiatao.

In: Nano Energy, Vol. 57, 03.2019, p. 57-65.

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