Room‐temperature Synthesis of Amorphous Molybdenum Oxide Nanodots with Tunable Localized Surface Plasmon Resonances

Abstract

Two-dimensional (2D) semiconductors have recently emerged as a remarkable class of plasmonic alternative to conventional noble metals. However, tuning of their plasmonic resonances towards different wavelengths in the visible-light region with physical or chemical methods still remains challenging. In this work, we design a simple room-temperature chemical reaction route to synthesize amorphous molybdenum oxide (MoO ) nanodots that exhibit strong localized surface plasmon resonances (LSPR) in the visible and near-infrared region. Moreover, tunable plasmon resonances can be achieved in a wide range with the changing surrounding solvent, and accordingly the photoelectrocatalytic activity can be optimized with the varying LSPR peaks. This work boosts the light-matter interaction at the nanoscale and could enable photodetectors, sensors, and photovoltaic devices in the future.

Ultrafast Nonlinear Optical Response in Plasmonic 2D Molybdenum Oxide Nanosheets for Mode‐Locked Pulse Generation

“…However, their applications in integrating optics devices have always been hampered by the high optical losses due to interband transitions, large real component of their dielectric constant, and fixed carrier density . In the past few years, the search of low‐loss and widely tunable plasmonic media has led to the development of diverse nonmetallic plasmonic nanocrystals, such as copper chalcogenides, transparent conducting oxides, and oxygen‐deficient metal oxides . These nonmetallic plasmonic materials exhibit enormous advantages in device performance, design flexibility, and property tunability.…”

Ultrasensitive Surface‐Enhanced Raman Spectroscopy Detection Based on Amorphous Molybdenum Oxide Quantum Dots

“…Furthermore, the corresponding SAED pattern of the H x MoO 3 quantum dots is shown in Figure d. The pattern of a typical halation without diffraction ring indicates its amorphous structure …”

“…Compared with the XRD pattern of bulk MoO 3 , a weak and broad peak appears in the range of 20–30°, which is assigned to the orthorhombic phase of MoO 3 (JCPDs no. 05‐0508) . It means that the crystallinity of the sample is extremely poor, so it can be suggested that MoS 2 has been transferred into amorphous MoO 3 after the oxidization process.…”

Amorphous Materials for Enhanced Localized Surface Plasmon Resonances

“…c) UV/Vis‐NIR diffuse reflectance spectra of the sample reduced in different solvent/water mixtures. Reprinted from reference . Copyright 2017 Wiley‐VCH.…”

“…It is also possible to introduce vacancies to manipulate the carrier density in the semiconductor nanocrystals post‐synthetically. This method was studied in our recent work on amorphous MoO 3− x nanodots . We demonstrated that amorphous molybdenum oxide (MoO 3 ) nanodots could be obtained by means of a facile sonochemistry approach, and they exhibited strong LSPR absorption in the visible and NIR regions (Figure ).…”