Polydopamine-mediated in situ growth of multibranched Au mesocrystals on carbon nanotube foams for sensitive, uniform and stable SERS detection

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL

Microchimica Acta Pub Date : 2025-09-17 DOI:10.1007/s00604-025-07534-x

Rong Yang, Qian Wang, Ling Zhu, Xiaodong Shen, Yang Cao, Yifeng Wang, Wenbo Xin

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Abstract

A facile, one-pot synthesis method is proposed for the in situ growth of multibranched gold (Au) mesocrystals on polydopamine (PDA)-modified three-dimensional (3D) carbon nanotube (CNT) foams using cetyltrimethylammonium bromide (CTAB) and silver nitrate (AgNO₃) as shape-directing agents. The synthesized Au mesocrystals exhibit complex 3D architectures composed of ultra-long branches (exceeding 1 μm) with sharp tips and serrated edges. Their morphology can be precisely tuned on CNT foams by adjusting the concentrations of CTAB and AgNO₃ in the growth solutions. The resulting CNT foam-multibranched Au mesocrystal hybrids exhibit high surface-enhanced Raman scattering (SERS) sensitivity, enabling the detection of rhodamine 6G and thiram at concentrations as low as 1 × 10^–11 M and 1 × 10^–10 M, respectively. Additionally, the 3D SERS substrates exhibit excellent uniformity, reproducibility, and long-term stability, maintaining high SERS activity after 10 weeks of storage. Importantly, the SERS substrates achieve sensitive detection of thiram on apple peels down to 2.4 ng/cm². This work provides a promising strategy for the efficient fabrication of high-performance 3D SERS platforms for practical sensing applications.

Graphical Abstract

查看原文本刊更多论文

多支金介晶在碳纳米管泡沫上的原位生长，用于灵敏、均匀和稳定的SERS检测

以十六烷基三甲基溴化铵（CTAB）和硝酸银（AgNO3）为定向剂，提出了一种简单的一锅合成方法，用于在聚多巴胺（PDA）修饰的三维（3D）碳纳米管（CNT）泡沫上原位生长多支金（Au）介晶。合成的Au介晶具有复杂的三维结构，由尖端锋利且边缘呈锯齿状的超长分支（超过1 μm）组成。通过调节生长溶液中CTAB和AgNO3的浓度，可以在碳纳米管泡沫上精确地调整它们的形态。所得到的碳纳米管泡沫-多支金介晶杂化物具有高的表面增强拉曼散射（SERS）灵敏度，可以分别在低至1 × 10-11 M和1 × 10-10 M的浓度下检测罗丹明6G和thiram。此外，3D SERS基板具有优异的均匀性、可重复性和长期稳定性，在10周的储存后仍保持较高的SERS活性。重要的是，SERS底物可以对苹果皮上的硫胺进行敏感检测，检测精度低至2.4 ng/cm2。这项工作为高效制造用于实际传感应用的高性能3D SERS平台提供了一种有前途的策略。图形抽象

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.