CO<sub>2</sub>‐Assisted Fabrication of Two‐Dimensional Amorphous Molybdenum Oxide Nanosheets for Enhanced Plasmon Resonances

Liu, Wei; Xu, Qun; Cui, Weili; Zhu, Chuanhui; Qi, Yuhang

doi:10.1002/ange.201610708

Cited by 20 publications

(10 citation statements)

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“…Although many other plasmonic nanostructures with varied chemical compositions (from aluminum to silver, gold) and different shapes (from spheres, rods to plates, stars) can be explored to fabricate plasmon-based colorimetric nanosensors, several alternative plasmonic nanomaterials beyond coinage metals have been predicted or even developed for plasmon-based colorimetric sensing use. As one example, we note that some of highly doped 2D materialsmainly for graphene and transition-metal oxides/chalogenidesexhibited tunable plasmon resonance peaks in the visible–near-IR region, which was thereby expected to enable the highly sensitive plasmonic sensing of external targets . Along with the rich plasmonic nanomaterials and collective optical properties, it is believed that the plasmon-based colorimetric nanosensors will continue to be of great benefit to the diverse sensing applications.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Plasmon-Based Colorimetric Nanosensors for Ultrasensitive Molecular Diagnostics

2017

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Colorimetric detection of target analytes with high specificity and sensitivity is of fundamental importance to clinical and personalized point-of-care diagnostics. Because of their extraordinary optical properties, plasmonic nanomaterials have been introduced into colorimetric sensing systems, which provide significantly improved sensitivity in various biosensing applications. Here we review the recent progress on these plasmonic nanoparticles-based colorimetric nanosensors for ultrasensitive molecular diagnostics. According to their different colorimetric signal generation mechanisms, these plasmonic nanosensors are classified into two categories: (1) interparticle distance-dependent colorimetric assay based on target-induced forming cross-linking assembly/aggregate of plasmonic nanoparticles; and (2) size/morphology-dependent colorimetric assay by target-controlled growth/etching of the plasmonic nanoparticles. The sensing fundamentals and cutting-edge applications will be provided for each of them, particularly focusing on signal generation and/or amplification mechanisms that realize ultrasensitive molecular detection. Finally, we also discuss the challenge and give our future perspective in this emerging field.

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Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Plasmon-Based Colorimetric Nanosensors for Ultrasensitive Molecular Diagnostics

2017

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“…Strong plasmonic peaks of 2D MoO3 in visible or NIR range have been achieved through several approaches [34,[36][37][38][39]. However, the biosensing capability of the highly integrated devices based on such plasmonic 2D MoO3 or other TMOs remains unexplored.…”

Section: List Of Abbreviationsmentioning

confidence: 99%

“…Such oxygen vacancies induced doping can facilitate enough electron concentration to support LSPR in the visible or NIR regions [33][34][35]. Recently, the tunable LSPR of 2D MoO3 has been most widely studied [34,35,38].…”

Section: Tmo Based Plasmonic Biosensingmentioning

confidence: 99%

“…There are three polymorphs of MoO3, the stable orthorhombic α-MoO3 ( nanoflakes is compromised by impurities and hydration during the oxidation process [38,209]. Another high yield method is liquid phase exfoliation which is also the most widely applied method [36,37,201,[210][211][212][213].…”

Section: Tmo Based Plasmonic Biosensingmentioning

confidence: 99%

“…Although the mechanism of inducing LSPR in heavily doped MoO3 nanoflakes has been thoroughly investigated, the potential of implementing such 2D plasmonic material in biosensing is seldom explored. Previous researchers studied the mixture of different concentrations of bovine serum albumin (BSA) solution and α-MoO3 nanoflakes solution [37,38,201]. They showed that negatively charged protein molecules have high affinity to α-MoO3 nanoflakes due to van der Waals forces and electrostatic interaction as α-MoO3 nanoflakes are positively charged.…”

Section: Tmo Based Plasmonic Biosensingmentioning

confidence: 99%

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Highly integrated biosensors based on fiber optics

Zhang¹

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Benefited from the advantages of flexibility, miniaturization, immunity to electromagnetic interference and compatibility with today's well-developed optical fiber based telecommunication system, fiber-optic sensors show huge potentials with the increasing demand of comprehensive perception in every aspect of life. Especially in the practices of biosensing, optical fibers are prevailing platforms for highlysensitive, real-time, label-free and in vivo detection due to their high degree of integration, dielectric nature, non-toxicity and chemical inertness. In this thesis, we investigate several approaches focusing on the proper design of optical fiber structure and the efficient integrations with functional materials to enhance the effectiveness of light-matter interaction and the reliability of biosensing output. Firstly, we develop a highly sensitive magnetic field sensor based on magneticfluid-coated long period fiber grating (LPG). The emergence of optomagnetic biosensors in recent years brings the needs of all-optical, integrated and flexible magnetic field sensors. Benefited from the acute response of LPG to ambient medium and the remarkable magneto-optic properties of magnetic fluid, our proposed magnetic field sensor provides a superior sensitivity of 0.154 dB/Gauss. Secondly, we investigate the possibility of improving conventional fiber-optic plasmonic biosensors by employing a graphene/gold hybrid plasmonic structure. Introducing a graphene layer not only strengthens the surface plasmons but also acts as an excellent replacement of surface functionalization. We construct a biosensor that integrates such hybrid plasmonic architecture with a side-polished optical fiber and achieves a limit of detection (LOD) of ssDNA as low as 1 pM. Thirdly, we explore the potentials of adopting transition metal oxides as an alternative class of plasmonic 2D materials for biosensing in well-developed visible and near-infrared (NIR) optical windows, since plasmonics of common 2D materials locate intrinsically at mid-infrared range. Here we demonstrate the feasibility of integrating heavily-doped 2D MoO3 with fiber-optic platform and achieving strong surface plasmons in NIR range, which facilities low LOD of biomolecules. Fourthly, we realize one-step green synthesis of -cyclodextrin (-CD) capped gold nanoparticles. The macrocyclic supramolecular -CD serves as

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Accurate Control of VS₂ Nanosheets for Coexisting High Photoluminescence and Photothermal Conversion Efficiency

Zhou

et al. 2020

Angewandte Chemie

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In two-dimensional (2D) amorphous nanosheets, the electron-phonon coupling triggered by localization of the electronic state as well as multiple-scattering feature make it exhibit excellent performance in optical science.V S 2 nanosheets,e specially single-layern anosheets with controllable electronic structure and intrinsic optical properties,have rarely been reported owingtothe limited preparation methods.Now, ac ontrollable and feasible switching method is used to fabricate 2D amorphous VS 2 and partial crystallized 2D VO 2 (D) nanosheets by altering the pressure and temperature of supercritical CO 2 precisely.T hanks to the strong carrier localization and the quantum confinement, the unique 2D amorphous structures exhibit full band absorption, strong photoluminescence,and outstanding photothermal conversion efficiency.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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CO₂‐Assisted Fabrication of Two‐Dimensional Amorphous Molybdenum Oxide Nanosheets for Enhanced Plasmon Resonances

Cited by 20 publications

References 50 publications

Plasmon-Based Colorimetric Nanosensors for Ultrasensitive Molecular Diagnostics

Plasmon-Based Colorimetric Nanosensors for Ultrasensitive Molecular Diagnostics

Highly integrated biosensors based on fiber optics

Accurate Control of VS₂ Nanosheets for Coexisting High Photoluminescence and Photothermal Conversion Efficiency

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CO2‐Assisted Fabrication of Two‐Dimensional Amorphous Molybdenum Oxide Nanosheets for Enhanced Plasmon Resonances

Cited by 20 publications

References 50 publications

Plasmon-Based Colorimetric Nanosensors for Ultrasensitive Molecular Diagnostics

Plasmon-Based Colorimetric Nanosensors for Ultrasensitive Molecular Diagnostics

Highly integrated biosensors based on fiber optics

Accurate Control of VS2 Nanosheets for Coexisting High Photoluminescence and Photothermal Conversion Efficiency

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Product

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CO₂‐Assisted Fabrication of Two‐Dimensional Amorphous Molybdenum Oxide Nanosheets for Enhanced Plasmon Resonances

Accurate Control of VS₂ Nanosheets for Coexisting High Photoluminescence and Photothermal Conversion Efficiency