纳米棒
等离子体子
离子
低语长廊波浪
材料科学
纳米颗粒
纳米技术
水溶液
离子键合
化学物理
光电子学
谐振器
化学
物理化学
有机化学
作者
Martin D. Baaske,Frank Vollmer
出处
期刊:Nature Photonics
[Springer Nature]
日期:2016-09-19
卷期号:10 (11): 733-739
被引量:150
标识
DOI:10.1038/nphoton.2016.177
摘要
Plasmonic nanoparticles provide the basis for a multitude of applications in chemistry, health care and optics because of their unique properties. Nanoparticle-based techniques have evolved into powerful tools for studying molecular interactions with single-molecule resolution. Here we show that this sensing capability can be used to detect single atomic ions in aqueous medium. We monitored interactions of single zinc and mercury ions with plasmonic gold nanorods (NRs) resonantly coupled to our whispering gallery mode sensor. Our system's ability to discern permanent binding and transient interaction allows us to study the different interaction kinetics of both ion species. The detection of transient interactions enables us to confirm statistically that the sensor signals originate from single ions. Furthermore, we reveal how the ion–NR interactions evolve with respect to the medium's ionic strength as mercury ions amalgamate with gold and zinc ions eventually turn into probes of highly localized surface potentials. Single zinc and mecury ions are optically detected in solution by detuning of metal nanorod resonators coupled to the whispering gallery mode of a dielectric cavity.
科研通智能强力驱动
Strongly Powered by AbleSci AI