金属纳米颗粒的聚合依赖氧化
Stacy L Allen1, Jay N Sharma1, Francis P Zamborini1
1Department of Chemistry, University of Louisville , Louisville, Kentucky 40292, United States.
Journal of the American Chemical Society
|August 31, 2017
概括
黄金纳米粒子 (Au NP) 聚合将其氧化潜力显著转移到更高的值,特别是对于较小的NP. 这一效应与聚合的Au NP面积与体积比率的降低有关.
科学领域:
- 电化学
- 材料科学
- 纳米技术
背景情况:
- 酸盐稳定金纳米颗粒 (Au NPs) 在各种应用中广泛使用.
- 了解它们的电化学行为对于优化它们的使用至关重要.
- 聚合可以改变纳米粒子的特性.
研究的目的:
- 研究聚合对Au NP的氧化潜力的影响.
- 要确定pH诱导的聚合如何影响Au NP电化学.
- 将氧化潜力的变化与NP大小和聚合程度相关联.
主要方法:
- 在玻璃/ITO电极上电化学沉积AuNP.
- 通过调整溶液 pH 来控制 Au NPs 的聚合.
- 在含的电解质中进行电化学氧化研究.
- 使用紫外线光谱和扫描电子显微镜 (SEM) 进行表征.
主要成果:
- 经过充分分离的 Au NP 呈现出大小依赖的氧化潜力.
- 4 和 15 nm Au NPs 的聚合会使氧化电位转移为正值 (高达 230 mV).
- 潜在转移的大小与聚合程度相关.
- 对于聚合的50 nm Au NP,没有观察到显著的氧化电位变化.
- 总体NP面积与体积比率的降低被认为是原因.
结论:
- NP聚合显著改变了它们的电化学氧化行为.
- 较小的Au NP更容易受到聚合诱导的氧化潜力的变化.
- 控制NP聚合对于可预测的电化学性能至关重要.
- 这些发现为纳米粒子表面化学和电化学提供了洞察力.
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