Two-dimensional MBenes with ordered metal vacancies for surface-enhanced Raman scattering. Issue 6 (20th January 2023)

• Record Type: Journal Article
• Authors: Lan, Leilei; Fan, Xingce; Zhao, Caiye; Gao, Juan; Qu, Zhongwei; Song, Wenzhe; Yao, Haorun; Li, Mingze; Qiu, Teng
• Is Part Of: Nanoscale. Volume 15:Issue 6(2023)
• Page Start: 2779
• Page End: 2787
• Publication Date: 2023-01-20
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr06280a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A totally new SERS technology, MBene-enhanced Raman scattering, is developed by employing MBene as a SERS-active material. An ordered vacancy-triggered highly sensitive MBene-based SERS platform with superior signal uniformity is designed. Abstract : As an emerging class of two-dimensional (2D) materials, MBenes show enormous potential for optoelectronic applications. However, their use in molecular sensing as surface-enhanced Raman scattering (SERS)-active material is unknown. Herein, for the first time, we develop a brand-new high-performance MBene SERS platform. Ordered vacancy-triggered highly sensitive SERS platform with outstanding signal uniformity based on a 2D Mo4/3 B2 MBene material was designed. The 2D Mo4/3 B2 MBene presented superior SERS activity to most of the semiconductor SERS substrates, showing a remarkable Raman enhancement factor of 3.88 × 10 6 and an ultralow detection limit of 1 × 10 −9 M. The underlying SERS mechanism is revealed from systematic experiments and density functional theory calculations that the ultrahigh SERS sensitivity of 2D Mo4/3 B2 MBene is derived from the efficient photoinduced charge transfer process between MBene substrates and adsorbed molecules. The abundant electronic density of states near the Fermi level of 2D Mo4/3 B2 MBene enables its Raman enhancement by a factor of 100 000 times higher than that of the bulk MoB. Consequently, the 2D Mo4/3 B2 MBene could accurately detect various trace chemical analytes. Moreover, with ordered metal vacancies in the 2D Mo4/3 B2 MBene, uniform charge transfer sites are formed, resulting in an outstanding signal uniformity with a relative standard deviation down to 6.0%. This work opens up a new horizon for the high-performance SERS platform based on MBene materials, which holds great promise in the field of chemical sensing.