3D Visible‐Light‐Driven Plasmonic Oxide Frameworks Deviated from Liquid Metal Nanodroplets. (27th September 2021)

• Record Type: Journal Article
• Authors: Alsaif, Manal M. Y. A.; Haque, Farjana; Alkathiri, Turki; Krishnamurthi, Vaishnavi; Walia, Sumeet; Hu, Yihong; Jannat, Azmira; Mohiuddin, Md; Xu, Kai; Khan, Muhammad Waqas; Ma, Qijie; Wang, Yichao; Pillai, Naresh; Murdoch, Billy J.; Dickey, Michael D.; Zhang, Bao Yue; Ou, Jian Zhen
• Is Part Of: Advanced functional materials. Volume 31:Number 52(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-27
• Subjects: liquid metals -- photodetectors -- plasmonic materials -- surface‐enhanced Raman scattering; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202106397
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Eutectic gallium‐indium (EGaIn) liquid metal droplets have been considered as a suitable platform for producing customized 3D composites with functional nanomaterials owing to their soft and highly reductive surface. Herein, the synthesis of a 3D plasmonic oxide framework (POF) is reported by incorporating the ultra‐thin angstrom‐scale‐porous hexagonal molybdenum oxide ( h ‐MoO3 ) onto the spherical EGaIn nanodroplets through ultrasonication. Simultaneously, a large number of oxygen vacancies form in h ‐MoO3, boosting its free charge carrier concentration and therefore generating a broad surface plasmon resonance across the whole visible light spectrum. The plasmonic chemical sensing properties of the POF is investigated by the surface‐enhanced Raman scattering detection of rhodamine 6G (R6G) at 532 nm, in which the minimum detectable concentration is 10 −8 m and the enhancement factor reached up to 6.14 × 10 6 . The extended optical absorption of the POF also allowed the efficient degradation of the R6G dye under the excitation of ultraviolet‐filtered simulated solar light. Furthermore, the POF exhibits remarkable photocurrent responses towards the entire visible light region with the maximum response of ≈ 1588 A W −1 at 455 nm. This work demonstrates the great potential of the liquid metal‐based POFs for high‐performance sensing, catalytic, and optoelectronic devices. Abstract : A liquid metal‐based 3D plasmonic oxide framework (POF) is developed, which consists of eutectic EGaIn nanodroplets coated with sub‐stoichiometric ultra‐thin hexagonal MoO3– x . The POF shows a broadband surface plasmon resonance across the visible and near‐infrared region. Together with the ultra‐high surface active area, the 3D POF demonstrates excellent performances in chemical sensing, photocatalytic, and optoelectronic applications.