MoS₂ Nanoflowers Decorated with Au Nanoparticles for Visible-Light-Enhanced Gas Sensing

Abstract

Highly sensitive and selective detection of trace nitrogen dioxide (NO2) in a complex outdoor air environment is an urgent need to guarantee human health and a beautiful environment. The effective combination of heterostructure and light irradiation is an important strategy to achieve high-performances gas sensors. However, the effect of light irradiation on gas-sensitive properties of heterostructure materials is not yet clear, and it is urgent to clarify the relationship between light irradiation and heterostructure for gas-sensing materials. Herein, a 530 nm-light-assisted Au–MoS2 gas sensor with a low detection limit as well as robust antihumidity interference ability is developed through introducing the localized surface plasmon resonance (LSPR) effect of Au nanoparticles (NPs). Under 530 nm light illumination, a Au–MoS2 gas sensor can achieve limit detection of NO2 as low as 10 ppb without operating temperature along with robust antihumidity ability. The optical simulation and experimental results show that the modification of MoS2 by Au NPs (diameter: 30 nm) combined with the matching light-assisted (530 nm) gas detection mode can make MoS2 fully absorb visible light and effectively improve the extinction cross section by taking full advantage of the LSPR effect, which is the primary reason for the enhanced performances of a MoS2-based gas sensor. This work provides theoretical and experimental guidance for gas sensors to effectively enhance the ability of gas detection by means of the light-assisted mode at room temperature, which opens up a unique approach to design high-performance gas sensors for trace-level gas detection.

BiVO4 Microparticles Decorated with Cu@Au Core-Shell Nanostructures for Photocatalytic H2O2 Production

“…It can be also demonstrated that the Cu@Au cocatalysts are successfully grafted onto the BiVO 4 surface. Meanwhile, the additional peaks in 600–700 nm can be attributed to the local surface plasmon resonance effect of Au …”

Au Nanoparticle-Decorated TiO2 Nanowires for Surface Plasmon Resonance-Based Photoelectrochemical Bioassays with a Solid–Liquid–Air Triphase Interface

“…To address this concern, activating semiconductor electrodes with visible light in the triphase PEC bioassays is a feasible solution. Metal NPs, especially Au NPs, possess intrinsic properties including strong surface plasmon resonance (SPR). − This leads to broad absorption spectra in the visible light region. Au NPs loaded on an appropriate semiconductor surface can absorb visible light and generate photoinduced charge carriers by SPR with extreme photostability. , Herein, we report an Au NP-decorated TiO 2 nanowire array (Au–TiO 2 NW)-based bio-photoanode with a solid–liquid–air triphase interface and demonstrate their application in PEC bioassays with wide linear detection range, low detection limit, high sensitivity, and high stability.…”

Highly Efficient SO2 Sensing by Light-Assisted Ag/PANI/SnO2 at Room Temperature and the Sensing Mechanism

“…For Ag/PANI/SnO 2 , the Ag modification of PANI/SnO 2 resulted in significantly enhanced UV and visible light absorption. This was attributed to the localized surface plasmon resonance (LSPR) induced by the Ag nanoparticles, as shown in Figure c. When photons with a suitable frequency were introduced, the resonance between the photons and electrons conducting on the Ag nanoparticle surfaces greatly enhanced the electric field localized around the Ag nanoparticles, ultimately leading to enhanced incident light absorption …”