Laser & Optoelectronics Progress, Volume. 57, Issue 9, 091601(2020)
Ultrasensitive Biochemical Detection by Employing Two-Dimensional Ti3C2Tx MXene Nanosheets
This study proposes a graphene monolayer/few layered Ti3C2Tx MXene/silver film as a new plasmonic hybrid nanostructure. The feasibility of two-dimensional Ti3C2Tx MXene in the ultrasensitive detection of surface plasmon resonance (SPR) was confirmed using the transfer matrix method. Calculation results show that both the photon absorption and energy loss are balanced by optimizing the thickness of Ti3C2Tx MXene and the silver film. In addition, under an excitation wavelength of 632.8 nm, the optimal sensing configuration is monolayer graphene/3-layered Ti3C2Tx MXene/35-nm silver film, which can produce an ultralow (approaching zero) SPR reflectivity (3.48×10 -9). For a minute variation in the refractive index (as small as 0.0012 RIU), the proposed configuration can produce a differential phase response up to 110.55°and provide a phase detection sensitivity as high as 9.21×10 4 (°)/RIU. In comparison with the conventional sensing configuration with angular modulation, the proposed configuration can provide an enhancement factor that is four orders of magnitude higher. Therefore, our proposed configuration has potential application in ultrasensitive biochemical detection.
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Caiyan Lu, Yongping Li, Yufeng Yuan, Junxian Liu. Ultrasensitive Biochemical Detection by Employing Two-Dimensional Ti3C2Tx MXene Nanosheets[J]. Laser & Optoelectronics Progress, 2020, 57(9): 091601
Category: Materials
Received: Jul. 3, 2019
Accepted: Sep. 12, 2019
Published Online: May. 6, 2020
The Author Email: Yuan Yufeng (yfyuan@szu.edu.cn), Liu Junxian (jxliu@mailbox.gxnu.edu.cn)