Au@HgxCd1-xTe core@shell nanorods by sequential aqueous cation exchange for near-infrared photodetectors
Au@HgxCd1-xTe core@shell nanorods by sequential aqueous cation exchange for near-infrared photodetectors
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通过顺序水性阳离子交换制备 Au@HgxCd1-xTe 核@壳纳米棒用于近红外光电探测器
DOI：
10.1016/j.nanoen.2018.12.030
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发表时间：
2019-03
期刊：
影响因子：
17.6
通讯作者：
Zhang Jiatao
中科院分区：
文献类型：
--
作者：
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
我们探索了通过连续水溶液阳离子交换法（ACE）合成Au@HgxCd1-xTe核@壳纳米棒用于近红外光电探测器的应用。提出了一些相关的Au@碲化物核/壳纳米棒结构，利用多步转变，通过二元，然后三元相的碲化物壳。后者由于逐步ACE方法而具有高结晶度。使用只有微量的镉+与三正丁基膦配位，协助相变从一个无定形的Ag 2 Te壳到一个高度结晶的Ag 3AuTe 2壳在第一阶段，这是其次是进一步的阳离子交换（CE）步骤与高得多的Cd 2+的水平，以制造一个高度结晶的CdTe壳，并与额外的CE与Hg 2+将其转化为HgxCd 1-xTe壳。壳组分的组成和壳的良好控制的厚度使得Au@碲化物纳米棒在NIR区域中具有可调谐的表面等离子体共振特性。利用增强的近红外吸收，在石墨烯上制造了Au @ HgxCd 1-xTe纳米棒的混合光电探测器结构，显示出可见的近红外（vis-NIR）宽带探测和高光响应度（类似于10（6）A/W）。
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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发表时间：
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期刊：
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