Engineering of Exciton–Plasmon Coupling Using 2D-WS₂ Nanosheets for 1000-Fold Fluorescence Enhancement in Surface Plasmon-Coupled Emission Platforms

Abstract

Enhancement of fluorescence emission from singlephoton quantum emitters on plasmonic nanomaterials using surface plasmon-coupled emission (SPCE) platforms has seen significant advancements. In parallel, there has also been an exponential rise in applications involving two-dimensional (2D) transition-metal dichalcogenides (TMDs) that exhibit unique exciton−plasmon interactions. Although both these Frontier research areas have impacted the development of sensor and sensing technologies, no study coalesces these two arenas for translational applications. In this work, we use thin WS 2 nanosheets for realizing 1000-fold fluorescence enhancement on the SPCE platform. Structure-dependent fluorescence enhancement exhibited by WS 2 provides new insight into the use of TMDs and exciton−plasmon coupling in SPCE substrates. Cellphone-based detection of the emitting dipole is another unique aspect of this work that presents a low-cost alternative in comparison with high-end detectors.

Imparting α-Borophene with High Work Function by Fluorine Adsorption: A First-Principles Investigation

“…Since the breakthrough of graphene, two-dimensional (2D) materials, including 2D monoelemental and nonmonoelemental materials, have received considerable attention and become one of the most popular research topics because of qualitative changes in their physical and chemical properties due to quantum size effect over the past decade. − As a typical member of two-dimensional monoelemental materials (Xenes), borophene has attracted significant attention over the last 10 years owing to its remarkable properties and wide range of applications. − Borophene comprises a series of boron sheets owing to its highly polymorphic nature, e.g., pure hexagonal (δ 3 -type), triangular (δ 6 -type), mixed triangular, and hexagonal (α, β, χ, and other δ-type) 2D superlattice structures, which is not observed in other Xenes. , Because of complex B–B nc-2e multicenter bonds and diverse structural polymorphs, these experimentally available borophenes exhibit numerous prominent and interesting features including in-plane anisotropic optical property; high optical transparency; high surface liveness; phonon-mediated superconductivity; exceptional electronic, semiconducting/metallic, photoacoustic, photothermal, and thermal transport properties; superior mechanical behavior; and outstanding supercapacity. − Therefore, borophene materials show promising applications in photovoltaics, display technologies, supercapacitors, metal-ion batteries, hydrogen storage, catalysis, biosensor applications, and so on. − …”

Surface Plasmon-Coupled Dual Emission Platform for Ultrafast Oxygen Monitoring after SARS-CoV-2 Infection

“…This increases the plasmon-dipole interaction and in turn, the fluorescence emission, either by manipulating the hotspot intensity , or increasing the radiative emission and outcoupling of the fluorescence . So far, there have been multiple studies on augmented enhancements in fluorescence emission with the use of several plasmonic substrates − and their application as ultra-sensitive sensors. However, there have been few studies on surface plasmon-coupled phosphorescence (SPCP), directed toward enhancement of the phosphorescence emission signal and their application in sensing.…”

Resolving the Heterogeneous Adsorption of Antibody Fragment on a 2D Layered Molybdenum Disulfide by Super-Resolution Imaging

“…However, the exact surface coverage cannot be estimated by these ensemble methods, and more importantly, the inhomogeneity of adsorption on the surface is inaccessible. Different structural features such as basal planes, edges, wrinkles, steps, and folding layers are unavoidably created in either chemically synthesized or mechanically exfoliated 2D layered TMDs. − These small structural defects possess unique structural and electronic properties, − which have distinct sensing abilities as compared to the pristine structure. For example, the adsorption sites are preferably at the unsaturated defects of MoS 2 , i.e., S vacancy or unsaturated Mo sites at edges.…”