GeSe nanosheets modified surface plasmon resonance sensors for enhancing sensitivity

Zhao Yuting; Gan Shuaiwen; Wu Leiming; Zhu Jiaqi; Xiang Yuanjiang; Dai Xiaoyu

doi:10.1515/nanoph-2019-0170

Nanophotonics (Feb 2020)

GeSe nanosheets modified surface plasmon resonance sensors for enhancing sensitivity

Zhao Yuting,
Gan Shuaiwen,
Wu Leiming,
Zhu Jiaqi,
Xiang Yuanjiang,
Dai Xiaoyu

Affiliations

Zhao Yuting: SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen 518060, China
Gan Shuaiwen: SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen 518060, China
Wu Leiming: SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen 518060, China
Zhu Jiaqi: SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen 518060, China
Xiang Yuanjiang: SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen 518060, China
Dai Xiaoyu: SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen 518060, China

DOI: https://doi.org/10.1515/nanoph-2019-0170
Journal volume & issue: Vol. 9, no. 2
pp. 327 – 336

Abstract

Read online

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.

Published in Nanophotonics

ISSN: 2192-8606 (Print); 2192-8614 (Online)
Publisher: De Gruyter
Country of publisher: Germany
LCC subjects: Science: Physics
Website: https://www.degruyter.com/journal/key/nanoph/html#submit

About the journal

Abstract

Keywords