Hierarchical gold nanoflowers via PIL-mediated facile synthesis: toward ultrasensitive SERS sensing of Rhodamine 6G

IF 2.8 4区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Transition Metal Chemistry Pub Date : 2026-02-18 DOI:10.1007/s11243-026-00719-0

Shijie Li, Chenchen Zhao, Lingyu Wang, Xiaoqi Feng, Jiaqiang Hou, Tianyu Gao, Guoli Yang, Kaisheng Yao

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Abstract

To address the limitations of traditional synthesis methods for gold nanostructures, which rely on high temperatures, toxic reagents, and harsh conditions, this study proposes an eco-friendly strategy for synthesizing gold spikelet nanoflowers using poly(ionic liquid) (PIL) as a structure-directing agent. By employing HAuCl₄ as the precursor and ascorbic acid (AA) as the reducing agent, hierarchical Au spikelet nanoflowers with tertiary structure were successfully prepared via a one-pot method in a 60 °C water bath. Systematic investigation of the influencing factors revealed that temperature, AA concentration, and PIL concentration collectively determine the product morphology, with PIL concentration exerting the most significant influence on both the morphology and hierarchical structure of the Au nanoflowers. Using Rhodamine 6G (R6G) as a molecular probe, the resulting substrate exhibited exceptional surface-enhanced Raman scattering (SERS) sensitivity, achieving a detection limit of 10^− 12 M for R6G, which surpasses the performance of most reported Au/Ag-based materials, and demonstrates high reproducibility (< 2% average relative deviation (RAD) from measurements at five randomly selected locations). This work provides a sustainable approach for fabricating high-performance SERS substrates, demonstrating promising potential for applications in biological sensing and diagnostics.

Graphical Abstract

Abstract Image

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通过pil介导的易合成分层金纳米花：罗丹明6G的超灵敏SERS传感

针对传统的金纳米结构合成方法依赖于高温、有毒试剂和恶劣条件的局限性，本研究提出了一种以聚离子液体（PIL）作为结构导向剂合成金小穗纳米花的环保策略。以HAuCl4为前驱体，抗坏血酸（AA）为还原剂，在60℃水浴中一锅法制备了具有三级结构的层次化金小穗纳米花。对影响因素的系统研究表明，温度、AA浓度和PIL浓度共同决定了产物的形貌，其中PIL浓度对Au纳米花的形貌和层次结构的影响最为显著。使用罗丹明6G （R6G）作为分子探针，所得到的衬底表现出优异的表面增强拉曼散射（SERS）灵敏度，R6G的检测限为10 - 12 M，超过了大多数报道的Au/ ag基材料的性能，并且具有高重复性（在五个随机选择的位置测量的平均相对偏差（RAD）为<； 2%）。这项工作为制造高性能SERS基板提供了一种可持续的方法，展示了在生物传感和诊断方面的应用潜力。图形抽象

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来源期刊

Transition Metal Chemistry 化学-无机化学与核化学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

1.3 months

期刊介绍： Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc. Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.