Oxygen defect-induced localized surface plasmon resonance at the WO_3−x quantum dot/silver nanowire interface: SERS and photocatalysis

Abstract

Synergistic effects in a WO3−x QD@AgNW composite: the LSPR occurs at the WO3−x QD/Ag NW interface, leading to the generation of SERS and photocatalysis simultaneously.

Facile Preparation of WO3−x Dots with Remarkably Low Toxicity and Uncompromised Activity as Co‐reactants for Clinical Diagnosis by Electrochemiluminescence

“…The transmission electron microscopy (TEM) image showed monodispersed nanoparticles with an average size of 2.7±1.2 nm (Figure c). The high‐resolution TEM pattern displayed clear lattice stripes with an interplanar d spacing of 0.37 nm, consistent with that of the (010) plane of WO 3− x (Figure d), and the filtered image in Figure e showed a typical lattice type of WO 3− x . X‐ray powder diffraction (XRD) and Raman analysis complementarily confirmed the successful exfoliation of bulk WS 2 .…”

“…As shown in Figure f, the XRD of bulk WS 2 presented its all characteristic diffraction peaks. After forming WO 3− x dots, the typical peak of bulk WS 2 at 2 θ =14.4° disappeared, while five characteristic peaks of WO 3− x dots were observed . Besides, the peaks of WO 3− x dots were well consistent with the monoclinic WO 2.9 (JCPDS No.…”

“…Moreover, XPS analysis of the tiny amount of S from WO 3− x dots suggested the valence change from +4 to +6 after the reaction (Supporting Information, Figure S2 c,e) . Thus, the XPS results indicated that the WS 2 nanosheet chemically converted into WO 3− x dots, and the coexistence of W 5+ (20 %) and W 6+ (80 %) demonstrated oxygen deficiencies in the as‐prepared WO 3− x dots …”

Latest Novelties on Plasmonic and Non-Plasmonic Nanomaterials for SERS Sensing

“…Indeed, the SERS activity was improved when the irradiation time was increased. This was due to the presence of oxygen defects in WO 2.72 QDs which favored charge transfers (electrons) inducing the SERS enhancement [ 100 ].…”

Enhanced photocatalytic performance of tungsten-based photocatalysts for degradation of volatile organic compounds: a review

“…Furthermore, the photocatalytic oxidation efficiency is reduced by the high recombination of electrons (e − ) and holes (h + ). Therefore, photocatalysis process should gain considerable attention to seek highly efficient photocatalysts, which can slow down the recombination rate, accelerate the charge separation efficiency and also respond to visible light absorption [15,16].…”