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 journal › Not applicable › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
---|---|
Pages (from-to) | 57-65 |
Journal / Publication | Nano Energy |
Volume | 57 |
Early online date | 11 Dec 2018 |
Publication status | Published - Mar 2019 |
Link(s)
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 journal › Not applicable › peer-review