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在扩散有限聚合中吸附和表面氧化驱动纳米粒子凝聚

Lubna Amer¹, Maurice Retout², Mengchen Liu²

¹Program in Materials Science and Engineering, University of California, San Diego, La Jolla, California 92093, United States.

Journal of the American Chemical Society

|September 20, 2025

概括

表面连接物控制银纳米粒子碎片组合. 芳香联体,如BSPP,独特地使纳米粒子凝聚和再结晶成为复杂的碎形结构,用于先进的应用.

科学领域:

纳米材料科学
表面化学
化学工程

背景情况:

之前已经证明可以驱动银纳米颗粒的扩散有限聚合 (DLA).
介导的AgNP碎形组合的基本机制仍然不清楚.
了解连接物效应对于控制纳米材料自组装至关重要.

研究的目的:

阐明表面连接体化学控制AgNP的DLA的机制.
调查不同类型的配体 (素,酸盐,多) 如何影响聚合动态和结构结果.
建立化学定向DLA的框架,用于创建层次的纳米材料.

主要方法:

对具有不同化学性质的九种不同的配体进行了系统检查.
使用诸如泽塔电位测量,X射线光电子光谱 (XPS) 和电子显微镜等技术的聚合动力学,氧化还原行为和结构转换的表征.
分析光散射,元素组成和配体分布.

主要成果:

芳香素配体,特别是 bis ((p-sulfonatophenyl) phenylphosphine (BSPP),独特地促进了 DLA 的产生.
BSPP促进了部分连接物脱离和银表面氧化,使纳米粒子凝聚和再结晶成为碎形结构.
醇和多联体不支持必要的分形形成的重组.
证据包括电荷中和,氧化银物种,增强的光散射和验证的碎形结构.

结论:

连接物化学不仅通过相互作用,而且还通过诱导核心结构转换来决定AgNP的构成.
芳香可以通过氧化驱动的重组来实现DLA,从而产生微米级的碎形结构.
这项工作为生物传感,催化和软物质工程中的应用合成等级纳米材料提供了机械的理解和可调的策略.

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