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Electromagnetic and optical characteristics of Nb5+-doped double-crossover and salmon DNA thin films

机译：NB5 +掺杂双交叉和三文鱼DNA薄膜的电磁和光学特性

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摘要

We report the fabrication and physical characteristics of niobium ion (Nb5+)-doped doublecrossover DNA (DX-DNA) and salmon DNA (SDNA) thin films. Different concentrations of Nb5+ ([Nb5+]) are coordinated into the DNA molecules, and the thin films are fabricated via substrate-assisted growth (DX-DNA) and drop-casting (SDNA) on oxygen plasma treated substrates. We conducted atomic force microscopy to estimate the optimum concentration of Nb5+ ([Nb5+](O) - 0.08mM) in Nb5+-doped DX-DNA thin films, up to which the DX-DNA lattices maintain their structures without deformation. X-ray photoelectron spectroscopy (XPS) was performed to probe the chemical nature of the intercalated Nb5+ in the SDNA thin films. The change in peak intensities and the shift in binding energy were witnessed in XPS spectra to explicate the binding and charge transfer mechanisms between Nb5+ and SDNA molecules. UV-visible, Raman, and photoluminescence (PL) spectra were measured to determine the optical properties and thus investigate the binding modes, Nb5+ coordination sites in Nb5+-doped SDNA thin films, and energy transfer mechanisms, respectively. As [Nb5+] increases, the absorbance peak intensities monotonically increase until similar to[Nb5+](O) and then decrease. However, from the Raman measurements, the peak intensities gradually decrease with an increase in [Nb5+] to reveal the binding mechanism and binding sites of metal ions in the SDNA molecules. From the PL, we observe the emission intensities to reduce them at up to similar to[Nb5+](O) and then increase after that, expecting the energy transfer between the Nb5+ and SDNA molecules. The current-voltage measurement shows a significant increase in the current observed as [Nb5+] increases in the SDNA thin films when compared to that of pristine SDNA thin films. Finally, we investigate the temperature dependent magnetization in which the Nb5+-doped SDNA thin films reveal weak ferromagnetism due to the existence of tiny magnetic dipoles in the Nb5+-doped SDNA complex.
机译：我们报告的制造和铌离子（NB5 +）的物理特性 - 掺杂doublecrossover DNA（DX-DNA）和鲑鱼DNA（SDNA）薄膜。不同浓度NB5 +的（[NB5 +]）被协调到的DNA分子，和该薄膜的通过衬底辅助生长制造（DX-DNA）上氧等离子体处理的基板和滴铸（SDNA）。我们进行原子力显微镜来估计NB5 +（[NB5 +]（O） - 0.08毫米）的最佳浓度在NB5 +掺杂DX-DNA薄膜，直至其中DX-DNA晶格保持它们的结构不变形。 X射线光电子能谱（XPS）进行探测插NB5 +的化学性质在SDNA薄膜。在峰强度的变化和结合能移位在XPS光谱目睹到阐明NB5 +和SDNA分子间的结合和电荷转移机制。紫外 - 可见，拉曼，和光致发光（PL）光谱测量以确定光学特性，因此探讨了结合模式，在NB5 + NB5 +配位点分别掺杂SDNA薄膜，和能量转移机制。为[NB5 +]的增加，吸收峰强度单调增加，直到类似于[NB5 +]（O），然后降低。然而，从拉曼测量，峰强度逐渐增加[NB5 +]减少揭示金属离子在分子SDNA捆扎机构和结合位点。从PL，我们观察到的发光强度，以减少它们在高达类似于[NB5 +]（O），然后后增加，期待NB5 +和SDNA分子之间的能量转移。电流 - 电压测量结果显示在观察到的电流的增加显著[NB5 +]在SDNA薄膜增加时相比，原始SDNA薄膜。最后，我们研究了与温度相关的磁化，其中NB5 +掺杂SDNA薄膜揭示弱铁磁性由于NB5 +微小的磁偶极子的存在掺杂SDNA复杂。

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