Xu Dapeng, Li Jiajia, Zhang Song, Zhang Yifan, Yang Wei, Wang Zixiong, Chen Jian
School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710032, People's Republic of China.
School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710032, People's Republic of China.
Spectrochim Acta A Mol Biomol Spectrosc. 2022 Jul 5;275:121165. doi: 10.1016/j.saa.2022.121165. Epub 2022 Mar 15.
Copper nanostructures have attracted more and more attention due to low preparation cost, similar thermal conductivity and optical characteristics to silver nanostructures. A novel macroscopic dendritic copper nanonoodles with the length of 3-50 mm prepared by solid-state ionics method at 10 μA direct current electric field (DCEF) using fast ionic conductor RbCuClI films was reported. The surface-enhanced Raman scattering (SERS) performance of prepared copper nanonoodles was detected by crystal violet (CV) and rhodamine B (RB) aqueous solution as analyte molecules. The results present that the copper nanonoodles assembled by short-range order copper nanowires and the diameters of nanowires changed from 20 nm to 80 nm, many regularly arranged nanoparticles with the diameter from 5 to 10 nm existed on the prepared copper nanonoodles, which lead to the nanonoodles have high surface roughness. The copper nanonoodles contain only Cu element, no O element and the fractal dimension of copper nanonoodles is 1.355 because of macroscopic dendritic structures. The prepared copper nanonoodles composed of pure Cu have high surface roughness and the free electrons on the rough copper nanonoodles resonate with the atomic nuclei inside the copper nanonoodles to form a locally enhanced electromagnetic field under the excitation of incident light, so the limiting concentrations for CV and RB detected by the prepared copper nanonoodles are as low as 1 × 10 mol/L and 1 × 10 mol/L, respectively. The centimeter-scale copper nanonoodles with low limiting concentration of analyte molecules can be used to detect harmful food additives.
由于制备成本低，且热导率和光学特性与银纳米结构相似，铜纳米结构越来越受到关注。据报道，利用快速离子导体RbCuClI薄膜，通过固态离子法在10 μA直流电场（DCEF）下制备了一种长度为3 - 50毫米的新型宏观树枝状铜纳米面条。以结晶紫（CV）和罗丹明B（RB）水溶液作为分析物分子，检测了所制备铜纳米面条的表面增强拉曼散射（SERS）性能。结果表明，铜纳米面条由短程有序的铜纳米线组装而成，纳米线直径从20纳米变化到80纳米，在所制备的铜纳米面条上存在许多直径为5到10纳米的规则排列的纳米颗粒，这导致纳米面条具有高表面粗糙度。铜纳米面条仅含Cu元素，不含O元素，由于宏观树枝状结构，其分形维数为1.355。所制备的由纯Cu组成的铜纳米面条具有高表面粗糙度，粗糙铜纳米面条上的自由电子与铜纳米面条内部的原子核共振，在入射光激发下形成局部增强的电磁场，因此所制备的铜纳米面条检测CV和RB的极限浓度分别低至1×10⁻⁸mol/L和1×10⁻⁷mol/L。具有低分析物分子极限浓度的厘米级铜纳米面条可用于检测有害食品添加剂。
