期刊
NANO ENERGY
卷 57, 期 -, 页码 57-65出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.12.030
关键词
Core/shell nanorods; Cation exchange synthesis; Near-infrared photodetector; Crystal phase engineering
类别
资金
- National Natural Science Foundation of China [51631001, 21643003, 51702016, 51501010, 21673058]
- Fundamental Research Funds for the Central Universities
- Key Research Program of Frontier Sciences of CAS [QYZDB-SSW-SYS031]
- Beijing Talents Fund [2015000021223ZK17]
- Talent Introduction Plan of Overseas Top Ranking by the State Administration of Foreign Experts Affairs [MSBJLG040]
- Chinese Scholarship Council
- UK Engineering and Physical Sciences Research Council [EP/P009050/1]
- European Research Council (Horizon 2020) [ERC-2016-STG-EvoluTEM-715502]
- EPSRC [EP/S019367/1, EP/P025021/1, EP/P009050/1] Funding Source: UKRI
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 (similar to 10(6) A/W).
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