Electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing

Two-dimensional (2D) plasmonic materials facilitate exceptional light–matter interaction and enable in situ plasmon resonance tunability. However, surface plasmons of these materials mainly locate intrinsically at the long wavelength range that are not accessible for practical applications. To addre...

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Main Authors: Zhang, Nancy Meng Ying, Li, Kaiwei, Zhang, Ting, Shum, Ping, Wang, Zhe, Wang, Zhixun, Zhang, Nan, Zhang, Jing, Wu, Tingting, Wei, Lei
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/90115
http://hdl.handle.net/10220/48419
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-901152020-03-07T14:02:38Z Electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing Zhang, Nancy Meng Ying Li, Kaiwei Zhang, Ting Shum, Ping Wang, Zhe Wang, Zhixun Zhang, Nan Zhang, Jing Wu, Tingting Wei, Lei School of Electrical and Electronic Engineering CINTRA CNRS/NTU/THALES Research Techno Plaza DRNTU::Engineering::Electrical and electronic engineering 2D Materials Transition Metal Oxides Two-dimensional (2D) plasmonic materials facilitate exceptional light–matter interaction and enable in situ plasmon resonance tunability. However, surface plasmons of these materials mainly locate intrinsically at the long wavelength range that are not accessible for practical applications. To address this fundamental challenge, transition metal oxides with atomically layered structure as well as free carriers doping capability have been considered as an alternative class of 2D plasmonic material for achieving tunable plasmonic properties in the visible and near-infrared range. Here, we synthesize few-layer α-MoO3 nanoflakes that are heavily doped with free electrons via H+ intercalation. The resultant substoichiometric MoO3–x nanoflakes provide strong plasmon resonance located at ∼735 nm. Moreover, the MoO3–x nanoflakes carrying positive charges show stable attachment to polyanions functionalized microfiber and good affinity to negatively charged biomolecules. Our experimental demonstration of fiber-optic biosensing platform provides a detection limit of bovine serum albumin as low as 1 pg/mL, and proves the feasibility and prospects of employing 2D MoO3–x plasmonic nanoflakes in highly integrated devices compliant with frequently used and cost-effective optical system. MOE (Min. of Education, S’pore) Accepted version 2019-05-28T08:22:56Z 2019-12-06T17:40:58Z 2019-05-28T08:22:56Z 2019-12-06T17:40:58Z 2017 Journal Article Zhang, N. M. Y., Li, K., Zhang, T., Shum, P., Wang, Z., Wang, Z., . . . Wei, L. (2017). Electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing. ACS Photonics, 5(2), 347-352. doi:10.1021/acsphotonics.7b01207 https://hdl.handle.net/10356/90115 http://hdl.handle.net/10220/48419 10.1021/acsphotonics.7b01207 en ACS Photonics © 2017 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsphotonics.7b01207 7 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Electrical and electronic engineering
2D Materials
Transition Metal Oxides
spellingShingle DRNTU::Engineering::Electrical and electronic engineering
2D Materials
Transition Metal Oxides
Zhang, Nancy Meng Ying
Li, Kaiwei
Zhang, Ting
Shum, Ping
Wang, Zhe
Wang, Zhixun
Zhang, Nan
Zhang, Jing
Wu, Tingting
Wei, Lei
Electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing
description Two-dimensional (2D) plasmonic materials facilitate exceptional light–matter interaction and enable in situ plasmon resonance tunability. However, surface plasmons of these materials mainly locate intrinsically at the long wavelength range that are not accessible for practical applications. To address this fundamental challenge, transition metal oxides with atomically layered structure as well as free carriers doping capability have been considered as an alternative class of 2D plasmonic material for achieving tunable plasmonic properties in the visible and near-infrared range. Here, we synthesize few-layer α-MoO3 nanoflakes that are heavily doped with free electrons via H+ intercalation. The resultant substoichiometric MoO3–x nanoflakes provide strong plasmon resonance located at ∼735 nm. Moreover, the MoO3–x nanoflakes carrying positive charges show stable attachment to polyanions functionalized microfiber and good affinity to negatively charged biomolecules. Our experimental demonstration of fiber-optic biosensing platform provides a detection limit of bovine serum albumin as low as 1 pg/mL, and proves the feasibility and prospects of employing 2D MoO3–x plasmonic nanoflakes in highly integrated devices compliant with frequently used and cost-effective optical system.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Zhang, Nancy Meng Ying
Li, Kaiwei
Zhang, Ting
Shum, Ping
Wang, Zhe
Wang, Zhixun
Zhang, Nan
Zhang, Jing
Wu, Tingting
Wei, Lei
format Article
author Zhang, Nancy Meng Ying
Li, Kaiwei
Zhang, Ting
Shum, Ping
Wang, Zhe
Wang, Zhixun
Zhang, Nan
Zhang, Jing
Wu, Tingting
Wei, Lei
author_sort Zhang, Nancy Meng Ying
title Electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing
title_short Electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing
title_full Electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing
title_fullStr Electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing
title_full_unstemmed Electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing
title_sort electron-rich two-dimensional molybdenum trioxides for highly integrated plasmonic biosensing
publishDate 2019
url https://hdl.handle.net/10356/90115
http://hdl.handle.net/10220/48419
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