We have explored the synthesis of [email protected]_xCd_1-xTe [email protected] nanorods by sequential aqueous cation exchange (ACE) for near-infrared photodetector application. A number of related [email protected] 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 Hg_xCd_1-xTe shell. The composition of the shell components and the well-controlled thickness of the shells enabled tunable surface plasmon resonance properties of the [email protected] nanorods in the NIR region. Utilizing the enhanced NIR absorption, a hybrid photodetector structure of [email protected]_xCd_1-xTe nanorods on graphene was fabricated, showing visible to NIR (vis-NIR) broadband detection with high photoresponsivity (~10⁶ A/W).

我们已经探索了通过连续水性阳离子交换（ACE）用于近红外光探测器的[电子邮件保护] _x Cd _1-x Te [电子邮件保护]纳米棒的合成。提出了许多相关的[受电子邮件保护的]核/壳纳米棒结构，利用了碲化物壳的二元和三元相的多步转化。由于采用逐步ACE方法，后者具有很高的结晶度。使用镉的仅痕量²⁺配位与三Ñ丁基膦，辅助从非晶的Ag相转变₂碲壳高度结晶的Ag ₃奥特₂第一阶段的外壳；接下来是进一步的阳离子交换（CE）步骤，其Cd ²⁺含量要高得多，以制造高度结晶的CdTe壳层，另外还有一个带有Hg ^2+的CE，以将其转化为Hg _x Cd _1-x Te壳层。壳成分的组成和壳的良好控制的厚度使NIR区域中受[电子邮件保护的]纳米棒的表面等离振子共振特性可调。利用增强的近红外吸收率，在石墨烯上制造了[受电子邮件保护] _x Cd _1-x Te纳米棒的混合光电探测器结构，对高红外响应（〜10 ⁶ A / W）的近红外（vis-NIR）宽带探测可见。