Tungsten Disulfide Enhance Sensitivity of Plasmon Resonance Sensor

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Category: Tungsten's News
Published on Tuesday, 28 August 2018 09:29

With the rapid development of graphene, people get interested in two-dimensional materials. Among these two-dimensional materials, transition metal dihalide has attracted extensive attraction because the thin layer structure of its atom owns the properties of electricity, optics, plasma, electrochemistry and electrocatalysis. 

WS2 experiment picture

Recently, the Luo Yunhan research group in College of Science & Engineering, JNU proposed a surface plasmon resonance sensors which can be enhanced by using nano tungsten disulfide film coating Two-dimensional materials of graphene nanomaterials such as tungsten disulfide, molybdenum disulfide, tungsten diselenide and molybdenum diselenide have a broad prospect in the fields of optoelectronics, catalysis, chemical and biosensing, supercapacitors, solar cells and lithium ion batteries. 

The researchers proposed and demonstrated that the sensitivity of the surface plasmon resonance sensor can be improved by using the metal film with tungsten disulfide nano-coating. The sensitivity of the plasmon resonance sensor is related to the thickness of the tungsten disulfide nanomaterial coating. It can be adjusted by coating with different concentrations of tungsten disulfide ethanol solution or coating more than once.

The result shows that due to its large surface, high refractive index and unique photoelectric properties, plasmon resonance sensitivity can be increased by 26.6% by using tungsten disulfide nanomaterial coating (the highest sensitivity in experiments can reach 2459.3nm/RIU). In addition, the researchers also suggested that the linearly dependent coefficient of the tungsten disulfide sensitivity-enhanced surface plasmon resonance sensor within the refractive index range of 1.333-1.360 is 99.76%.

In addition to the improvement of sensitivity, the tungsten disulfide nano-coating can prevent the metal film from being oxidized and owns a lot of good properties such as tunability of resonant wavelength area, biocompatibility and gas-sensitivity.