Issue 1, 2021

Effects of additive NH3 with citric acid in the precursor and controlling the deposited thickness for growing molybdenum oxide crystals and nanorods

Abstract

In recent years, researchers have successfully established a simple method for the production of fine single crystal-like α-MoO3 nanorod structures on substrates using a solution metal–organic decomposition (MOD) method to deposit film coatings. However, to grow α-MoO3 nanorods by the MOD method, an accurate mechanism between α-MoO3 nanorod extension and precursor preparation (contents of precursor conditions) should be identified. Here, we demonstrated controllable α-MoO3 nanorods and plate-like α-MoO3 crystal growth based on as-deposited film thickness by using different citric acid (CA) and ammonia (NH3) ratios in the precursor solutions. The α-MoO3 nanorod growth mechanisms are discussed in detail with the precursor conditions and deposition film thickness; excellent results were achieved in controlling the film thickness by preparation of the precursor viscosities. In addition, the effects of the CA and NH3 amounts on the α-MoO3 nanorods and crystal growth were investigated. It was found that NH3 plays an effective role in delaying the decomposition timing of CA, promotes the growth of α-MoO3 nanorods, and reduces the growth and increase of plate-like α-MoO3 crystals. The study obtained excellent results for the growth extension of α-MoO3 nanorods and plate-like α-MoO3 crystals, controlled by film thickness as the role of CA and NH3. The demonstrated strictly controlled α-MoO3 nanostructure forming process can be achieved with the solution MOD method.

Graphical abstract: Effects of additive NH3 with citric acid in the precursor and controlling the deposited thickness for growing molybdenum oxide crystals and nanorods

Supplementary files

Article information

Article type
Research Article
Submitted
31 Jul 2020
Accepted
07 Oct 2020
First published
09 Oct 2020

Mater. Chem. Front., 2021,5, 386-395

Author version available

Effects of additive NH3 with citric acid in the precursor and controlling the deposited thickness for growing molybdenum oxide crystals and nanorods

Y. Hirose, T. Sugahara, J. Nakamura, N. Harada and K. Suganuma, Mater. Chem. Front., 2021, 5, 386 DOI: 10.1039/D0QM00535E

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