Blue colloidal nanoparticles of molybdenum oxide by simple anodizing method: decolorization by PdCl2 and observation of in-liquid gasochromic coloration

Magnetic Circular Dichroism of Substoichiometric Molybdenum Oxide (MoO3–x) Nanoarchitectures with Polaronic Defects

“…The wide-range NIR absorption of substoichiometric MoO 3– x , involving blue coloration, has been basically explained by either (i) a small-polaron model or (ii) a localized surface plasmon resonance (LSPR) mechanism . Small polarons represent local charge transfer between the Mo 5+ and Mo 6+ sites and describe that their energy, hence the absorption peak position, varies with the color-center concentration, whereas surface plasmons correspond to oscillations of conductive electrons in the volume of the entire nanostructure, and the LSPR peak position should be influenced by the size, shape (morphology), and dispersion medium. , To gain better insight into the physical origin of NIR absorption (blue coloration) and magneto-optical (MO) activity in the nanostructured MoO 3– x materials, we examine the optical properties on the basis of vis-NIR absorption and MCD spectroscopy, whose results are presented in Figures and .…”

“…6 However, despite the intensive studies on their optical properties, there is no unique model (or exists some controversy) to satisfactorily describe the origin of NIR absorption for nanostructured MoO 3−x probably due to the spectroscopic and/or morphological diversity in the oxides. 7,8 Meanwhile, magnetic circular dichroism (MCD) is the differential absorption of left and right circularly polarized light measured under a magnetic field and gives significant information on the electronic structures of the materials in detail, since the MCD arises from the same transitions as those seen in the normal absorption spectrum but the selection rules are different. 9 Then, MCD spectroscopy has been widely applied in molecular systems as well as magnetic materials to reveal their electronic-state information.…”

36‐1: Variable Transmission Electrophoretic Films

“…The most widely used light valves are currently electrochromic (EC) [3][4] [5], polymer dispersed liquid crystal (PDLC) [6][7] and suspended particle displays (SPDs) [8]. Other techniques, including electricallyinduced elastomer deformation [9], reversible electroplating [10], electrowetting [11], gasochromic [12] and optofluidic smart glass [13], are also under development.…”

Laser Synthesis and Spectroscopy of Molybdenum Oxide Nanorods

“…Molybdenum oxide nanoparticles have important applications resulting from their catalytic, − electrochemical, ,− and photochromic properties. − These particles have recently been used in medical applications to provide antimicrobial material coatings , and disease treatment alternatives. − Hydrothermal or solvo-thermal reactions ,,,,,− are typically used to produce molybdenum oxide nanoparticles, but they can also be synthesized by wet chemical reduction reactions, ,, sol–gel methods, , sonication, − electrochemical reactions, ,, vapor deposition, ,, and laser-based techniques. ,,,, These methods produce a wide variety of morphologies ranging from irregular shapes to more uniform spheres, rods, prisms, or other nanostructures. Some methods produce discrete particles while others produce thin films on substrates.…”