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

DOI: 10.1016/j.nanoen.2018.12.030 DOI Help

Authors: Xinyuan Li (Beijing Institute of Technology) , Muhammad Ahsan Iqbal (National Center for Nanoscience and Technology) , Meng Xu (Beijing Institute of Technology) , Yi-chi Wang (The University of Manchester) , Hongzhi Wang (Beijing Institute of Technology) , Muwei Ji (Tsinghua University) , Xiaodong Wan (Beijing Institute of Technology) , Thomas J. A. Slater (Diamond Light Source; The University of Manchester) , Jia Liu (Beijing Institute of Technology) , Jiajia Liu (Beijing Institute of Technology) , Hongpan Rong (Beijing Institute of Technology) , Wenxing Chen (Beijing Institute of Technology) , Stephen V. Kershaw (City University of Hong Kong) , Sarah J. Haigh (The University of Manchester) , Andrey L. Rogach (City University of Hong Kong) , Liming Xie (National Center for Nanoscience and Technology, Beijing) , Jiatao Zhang (Beijing Institute of Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nano Energy

State: Published (Approved)
Published: December 2018

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).

Journal Keywords: core/shell nanorods; cation exchange synthesis; near-infrared photodetector; crystal phase engineering

Subject Areas: Materials, Chemistry

Technical Areas: