Saeed Shomaila, Iqbal Azhar, Iqbal Azhar
Department of Chemistry, Quaid-I-Azam University, Islamabad 45320, Pakistan.
Proc Math Phys Eng Sci. 2020 Mar;476(2235):20190616. doi: 10.1098/rspa.2019.0616. Epub 2020 Mar 4.
A new nanohybrid material is prepared by attaching CdTe nanoneedles (NNs) to surface-modified ZnSe quantum dots (QDs). The NNs and QDs are prepared by a colloidal synthesis method in an aqueous alkaline medium. The surface modification and the attachment of nanostructures are achieved by a bifunctional ligand 3-mercaptopropionic acid (3-MPA). The band gap of the ZnSe QDs is varied by controlling the size of the QDs in order to get the maximum overlap between the absorption band of the CdTe NNs and the emission band of the ZnSe QDs, which is a prerequisite for effective charge/energy transfer. The possibility of photoinduced charge transfer (PCT) and Förster resonance energy transfer (FRET) from the donor (QDs) to the acceptor (NNs) has been assessed. Very fast (less than 800 ps) PCT and FRET from QDs to NNs occur because the emission band of QDs overlaps with the absorption band of NNs. The calculated large value of the overlapping integral, () ∼4.5 × 10Mcmnm, of the donor and the acceptor bands proves the feasibility of energy transfer. These findings suggest that the ZnSe QDs can exchange photoinduced energy with the CdTe NNs effectively over a wide distance in a CdTe-ZnSe nanohybrid.
通过将碲化镉纳米针（NNs）附着到表面改性的硒化锌量子点（QDs）上制备了一种新型纳米杂化材料。NNs和QDs在碱性水介质中通过胶体合成法制备。纳米结构的表面改性和附着通过双功能配体3-巯基丙酸（3-MPA）实现。通过控制QDs的尺寸来改变硒化锌QDs的带隙，以便使碲化镉NNs的吸收带与硒化锌QDs的发射带之间实现最大程度的重叠，这是有效电荷/能量转移的先决条件。已经评估了从供体（QDs）到受体（NNs）的光致电荷转移（PCT）和福斯特共振能量转移（FRET）的可能性。由于QDs的发射带与NNs的吸收带重叠，因此从QDs到NNs发生了非常快速（小于800皮秒）的PCT和FRET。供体和受体带的重叠积分的计算值很大，（）~4.5×10Mcmnm，证明了能量转移的可行性。这些发现表明，在CdTe-ZnSe纳米杂化材料中，硒化锌QDs可以在很宽的距离内与碲化镉NNs有效地交换光致能量。
