Potential-Scanning Localized Surface Plasmon Resonance Sensor
Potential-Scanning Localized Surface Plasmon Resonance Sensor
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DOI：
10.1021/acsnano.5b01577
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发表时间：
2015-06-01
期刊：
影响因子：
17.1
通讯作者：
Tatsuma, Tetsu
中科院分区：
文献类型：
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作者：
Nishi, Hiroyasu;Hiroya, Sayaka;Tatsuma, Tetsu
基于等离子体纳米粒子的局域表面等离子体共振（LSPR）传感器近期备受关注。在此我们提出一类新型的LSPR传感器，即电位扫描LSPR传感器，其中等离子体纳米粒子的电子密度通过电位扫描来控制。该传感器在电位扫描过程中呈现出一个共振峰，此共振峰随局部折射率的增加而负向移动。因此，本传感器可应用于基于电位扫描而非波长扫描的亲和生物传感器和化学传感器。电位扫描LSPR传感器不需要用于波长扫描的空间和机械设备，所以与传统的LSPR传感器相比，它有利于小型化和降低成本。我们阐述了电位扫描LSPR传感器的原理和理论灵敏度，并使用带有负载金纳米球（直径为13或40纳米）或纳米棒的ITO电极的传感器进行了折射率测量演示。较小和较大的纳米球分别适用于具有更宽动态范围和更高灵敏度的传感。纳米棒的使用进一步提高了灵敏度和品质因数。
Localized surface plasmon resonance (LSPR) sensors based on plasmonic nanoparticles attract much attention recently. Here we propose a new class of LSPR sensor, that is, a potential-scanning LSPR sensor, in which electron density of the plasmonic nanoparticles is controlled by potential scanning. The sensor exhibits a resonance peak during the potential scan, which negatively shifts with increasing local refractive index. Therefore, the present sensor can be applied to affinity biosensors and chemical sensors based on potential scan instead of wavelength scan. The potential-scanning LSPR sensors do not require space and a mechanical device for wavelength scanning, so the sensors are advantageous for miniaturization and cost reduction, in comparison-with the conventional LSPR sensors. We explain the principle and theoretical sensitivities of the potential-scanning LSPR sensors, and refractometry is demonstrated using a sensor with an ITO electrode loaded with gold nanospheres (13 or 40 nm diameter) or nanorods. The smaller and larger nanospheres are suitable for sensing with a wider dynamic range and with a higher sensitivity, respectively. The use of nanorods further improves the sensitivity and figure of merit.