Characterization and Sensing of Inert Gases with a High-Resolution SPR Sensor

Abstract

It is generally difficult to characterize inert gases through chemical reactions due to their inert chemical properties. The phase interference-sensing system based on high-resolution surface plasmon resonance (SPR) has an excellent refractive index detection limit. Based on this, this paper presents a simple and workable method for the characterization and detection of inert gases. The phase of light for the present SPR sensor is more sensitive to the change in the external dielectric environment than an amplitude SPR sensor. The limit of detection (LOD) is usually in the order of 10−6 to 10−7 RIU, which is superior to LSPR (Localized Surface Plasmon Resonance) sensors and traditional SPR sensors. The sensor parameters are simulated and optimized. Our simulation shows that a 36 nm-thick gold film is more suitable for the SPR sensing of inert gases. By periodically switching between the two inert gases, helium and argon, the resolution of the system is tested. The SPR sensing system can achieve distinguishable difference signals, enabling a clear distinction and characterization of helium and argon. The doping of argon in helium has a detection limit of 1098 ppm.

SPR sensor functionalized with zinc oxide and its detection of gaseous formaldehyde

“…(1) 研究者们针对不同的传感气 体发展出了有针对性的分子捕获层 [17][18][19][20][21][22][23][24][25][26][27][28][29] . 例如, 采用 SnO 2 分子层来捕获NH 3 [21] ; 采用多层碳纳米管吸附 H 2 S气体 [28] 以及使用聚四氟乙烯涂层富集H 2 气体 [29] 等.…”

Surface Plasmon Resonance Sensor Based on Double-Sided Polished Microstructured Optical Fiber Coated With Graphene-on-Silver Layers

“…[25]. The dielectric constant of silver is defined by the Drude model [25]: where ε Ý = 9.84, ω p = 1.36×10 16 , and ω τ = 1.018×10 14 . The complex RI of graphene is described by the following equation [25]- [28]:…”

“…S URFACE plasmon resonance (SPR) sensors have been extensively studied over the recent decades due to their unique functions, playing an important role in industrial applications, such as bio-sensing, medical diagnostics, food safety, chemical analysis, gas detection and so on [1]- [16]. A conventional SPR sensor is based on Kretschmann setup, widely adopting the prism and metal with opposite dielectric constants to excite the electron density oscillations [17], [18].…”

“…Despite the sensing performance of SPR sensors based on prism is now relatively stable, these SPR sensors have some disadvantages of bulky volume and limited operation, which makes it unsuitable for miniaturization and remote sensing. As a new alternative solution, the optical fiber has emerged to replace it because of absolute advantages of miniaturization, high integration and remote sensing [1]- [16]. Many optical fiber based SPR sensors with different structures have been proposed for higher sensitivity and resolution [1]- [7].…”

Guided Mode Induced Surface Phase Mutation for Enhanced SPR Biosensor with Dual‐Parameters Interrogation

“…Among these properties that can be inspected, the resonant phase detection of excitation light has been demonstrated to be the most sensitive mechanism. [8][9][10][11][12] Yet direct inspection of resonant phase is challenging. Previous studies have proposed various methods to extract resonant phase, such as interferometric systems, heterodyne systems, and phase shift equipment.…”