通过超快光生成增强等离子体反应性氧物种
Ramprasath Rajagopal1,2,3, Koustav Kundu2,3, Tianhong Ouyang2,3
1Department of Physics, Boston University, Boston, MA 02215, United States.
概括
黄金纳米棒 (AuNR) 在激光下产生反应性氧物种 (ROS). AuNR重塑和ROS生成取决于激光流动和表面涂层,脂质涂层提供稳定性.
科学领域:
- 纳米技术
- 摄影化学
- 材料科学
背景情况:
- 黄金纳米棒 (AuNR) 是具有可调节光学特性的纳米材料.
- 激光激发AuNR可以诱导光化学反应.
- 反应性氧物种 (ROS) 在各种化学和生物过程中发挥作用.
研究的目的:
- 在激光照射下研究金纳米棒 (AuNRs) 的反应性氧物种 (ROS) 生成.
- 了解激光流动和AuNR大小对ROS产生的影响.
- 检查表面被动化对AuNR稳定性和ROS产生的影响.
主要方法:
- 使用罗达胺B降解试验量化ROS生成.
- 采用812nm的中心,85 femtosecond (fs) 脉冲激光照射.
- 研究的AuNR具有不同的尺寸和表面化学成分 (脂质,PEG,CTAB).
- 进行了近场强度和吸收效率的模拟.
主要成果:
- 最初的ROS生成速度与罗达胺B降解成比例.
- 激光诱导的AuNR变形会影响后期的降解速度.
- ROS生成显示了功率法对激光流动性的依赖.
- AuNR重塑是流动依赖的,导致光谱脱调和降低ROS生成在较高的流动.
- 与PEG或CTAB涂层相比,油脂涂层的AuNR表现出更高的稳定性,同时仍能产生ROS.
结论:
- 在激光激发时,AuNRs可以产生ROS,其速率受到大小,流动性和表面化学的影响.
- 激光照射下的AuNR重塑是影响持续ROS产生的一个关键因素.
- 表面被动化策略,特别是脂质涂层,可以调节AuNR稳定性和ROS生产效率.
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