Li Xuhuan, Zhu Ling, Yang Rong, Cai Chunli, Yin Changsheng, Shen Xiaodong, Xin Wenbo
College of Materials Science and Engineering, Nanjing Tech University, No. 30 Puzhu South Road, Jiangbei New Area, Nanjing, 211816, Jiangsu, China.
Mikrochim Acta. 2025 Jan 8;192(2):57. doi: 10.1007/s00604-024-06887-z.
A polyethyleneimine (PEI)-assisted simple and efficient one-pot hydrothermal reduction method is reported to prepare high-quality gold nanodendrites (AuNDs) on a carbon nanotube (CNT) sheet. We observed that the prepared AuNDs have a well-defined backbone-multiple branching structure. With the systematical investigation of the growth mechanism, it was found that the bromide (Br) ion concentration has an essential effect on the formation of AuNDs. By evaluating the growth conditions of AuNDs, it was demonstrated that PEI attached on the surface of CNT sheet plays multiple crucial roles as a reducing agent, stabilizer, and structure director in the formation of AuNDs. The prepared CNT-AuNDs hybrid was employed as a flexible surface-enhanced Raman scattering (SERS) substrate to detect the analyte Congo red (CR). Due to the unique structure of AuNDs, such as 3-D branches, rough surface, and sharp edges, the analyte can be detected efficiently down to a concentration as low as 1 × 10 M with an enhancement factor as high as 5.6 × 10.
报道了一种聚乙烯亚胺（PEI）辅助的简单高效的一锅水热还原法，用于在碳纳米管（CNT）片上制备高质量的金纳米枝晶（AuNDs）。我们观察到所制备的AuNDs具有明确的主干-多分支结构。通过对生长机制的系统研究，发现溴离子（Br）浓度对AuNDs的形成具有至关重要的影响。通过评估AuNDs的生长条件，证明附着在CNT片表面的PEI在AuNDs的形成过程中作为还原剂、稳定剂和结构导向剂发挥了多种关键作用。所制备的CNT-AuNDs杂化物被用作柔性表面增强拉曼散射（SERS）基底来检测分析物刚果红（CR）。由于AuNDs的独特结构，如三维分支、粗糙表面和尖锐边缘，该分析物能够以低至1×10⁻⁸ M的浓度被高效检测，增强因子高达5.6×10⁶。
