Plasmonic Molybdenum Dioxide Ultrathin Nanowire Bundles for Highly Sensitive, Stable, and Reproducible Surface-Enhanced Raman Spectroscopy

Abstract

In surface-enhanced Raman spectroscopy (SERS) detection, it is important to improve the sensitivity, stability, and reproducibility of semiconductor surface-enhanced Raman scattering (SERS) substrates. Here, a simple chemical method was used to synthesize molybdenum dioxide ultrathin nanowire bundles. The ultrathin nanowire bundles of molybdenum dioxide demonstrate distinct and robust surface plasmon resonance (SPR) effects within the visible light range. As a low-cost SERS substrate, the plasmonic molybdenum dioxide nanowire beams exhibit a Raman enhancement factor of 2.9 × 10 7 and a minimum detection limit of 1.0 × 10 −11 mol L −1 for Rhodamine 6G. In addition, these SERS substrates based on molybdenum dioxide ultrathin nanowires exhibit good chemical stability and can resist corrosion by strong acids and bases over time. The molybdenum dioxide ultrathin nanowire bundles have a high potential to become an ideal metal-oxidebased SERS substrate material.

Construction of hierarchical NCMTs@MoO2/FeNi3 tubular heterostructures for enhanced performance in catalysis and protein adsorption

“…As a commonly used transition metal oxide, molybdenum dioxide (MoO 2 ) holds many advantages such as high electrical conductivity, high melting point, and good chemical stability, which make it an attractive material for various applications including catalysis, sensors, supercapacitors, Li-ion batteries, cancer therapy and surface-enhanced Raman scattering (SERS). 17–21 For example, Lou and co-workers have developed a facile solvothermal process and subsequent thermal treatment strategy to obtain a unique triple-shelled MoO 2 /carbon composite, which exhibited high electrochemical performance and excellent cycling stability in lithium-ion batteries. Xi et al reported that metallic MoO 2 can be used as a SERS substrate to detect trace amounts of high-risk chemicals including bisphenol A (BPA), dichlorophenol (DCP), and pentachlorophenol (PCP).…”