TY - JOUR
AU1 - Lee, Seyoung
AU2 - Roh, Jaeseok
AU3 - Kim, Myungsuk
AU4 - Lee, Jeongha
AU5 - Lee, Kun-Jae
AB - The powder synthesis conditions were controlled to prepare several phases of molybdenum (Mo) oxide having various morphologies in the ultrasonic spray pyrolysis process. Mo oxide was synthesized from the precursor ammonium heptamolybdate tetrahydrate (AHM). The spherical orthorhombic α-phase MoO3 and monoclinic β-phase MoO3 particles were prepared by controlling the synthesis temperature. Also, the belt-shaped α-phase MoO3 membrane with a length of several micro- to millimeters was formed by increasing the reaction temperature. The collection of the powder was adjusted with the position from the front- to back-collecting zone to reduce the occurrence of unnecessary condensation and the powder loss during the process. In addition, different amounts of polymers such as polyvinylpyrrolidone (PVP) and polyacrylic acid (PAA) were added in the precursor solution to control the structural properties of molybdenum oxide. The sprayable conditions of the precursor solution containing each polymer with different concentrations were investigated to set up the additional amounts of the polymer. The morphology was controlled to the spherical particles having a porous or hollow structure depending on the type and amount of polymer in the precursor solution. At the same time, the multiphase powders were prepared in which MoO3 was reduced to Mo4O11 and MoO2 by the effect of carbon monoxide (CO) produced by the thermal decomposition of the polymer.Graphical abstract[graphic not available: see fulltext]
TI - Effects of synthesis temperature and polymer addition on the phase and morphology of molybdenum oxide by ultrasonic spray pyrolysis
JF - Journal of Materials Science
DO - 10.1007/s10853-022-07126-7
DA - 2022-10-01
UR - https://www.deepdyve.com/lp/springer-journals/effects-of-synthesis-temperature-and-polymer-addition-on-the-phase-and-IH77Oti1Iq
SP - 18000
EP - 18013
VL - 57
IS - 38
DP - DeepDyve
ER -