Abstract
Abstract Germanium selenide (GeSe) nanosheets are stable and inexpensive and considered to have a great potential for photovoltaic applications, however we have demonstrated that GeSe nanosheets are also promising for sensing technology, in this paper. By spin-coating the GeSe nanosheets on the surface of noble metal (Au), we have obtained a surface plasmon resonance (SPR) sensor with significantly enhanced sensitivity, and the performance of the sensor is closely related to the thickness of the GeSe film. By detecting different refractive index solutions, we have obtained the optimized sensitivity with 3581.2 nm/RIU (which is nearly 80% improvement compared to traditional SPR sensors) and figure of merit with 14.37 RIU−1. Moreover, the proposed SPR sensor was vastly superior in sensing Pb2+ heavy metal ions after coating it with chitosan and GeSe composite. A maximum sensitivity of 30.38 nm/μg/l has been verified, which is nearly six times better than that of conventional SPR sensor. Our results demonstrated that GeSe nanosheets overlayer with modified SPR sensor has its great potential in heavy metal detection and chemical-specific molecular identification.
Highlights
In recent years, researches on sensing applications using some superior two-dimensional (2D) materials, such as graphene, black phosphorus (BP), and transition metal dichalcogenides (TMDCs), have gained widespread attention [1,2,3], because of their unique electronic and optical properties [4, 5]
Germanium selenide (GeSe) nanosheets are stable and inexpensive and considered to have a great potential for photovoltaic applications, we have demonstrated that GeSe nanosheets are promising for sensing technology, in this paper
By detecting different refractive index solutions, we have obtained the optimized sensitivity with 3581.2 nm/RIU and figure of merit with 14.37 RIU−1
Summary
Researches on sensing applications using some superior two-dimensional (2D) materials, such as graphene, black phosphorus (BP), and transition metal dichalcogenides (TMDCs), have gained widespread attention [1,2,3], because of their unique electronic and optical properties [4, 5] In addition to these 2D materials, germanium selenide (GeSe), a novel layered semiconductor 2D material located in the fourth group, is commonly applied in a range of important fields such as electronic devices, photodetectors, and sensor chips due to its strong absorption of visible light [6,7,8], high stability, and extremely narrow band gap [9]. The final results showed that the GeSe-chitosan SPR senor has a significant enhancement in detection sensitivity, spectral resolution and detection limit for lead ions comparing with traditional SPR sensors
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
