A Comparative Characterization Study of Molybdenum Oxide Thin Films Grown Using Femtosecond and Nanosecond Pulsed Laser
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A Comparative Characterization Study of Molybdenum Oxide Thin Films Grown Using Femtosecond and Nanosecond Pulsed Laser Deposition Harsha K. Puppala, Anthony T. Pelton and Robert A. Mayanovic MRS Advances / FirstView Article / August 2016, pp 1 - 6 DOI: 10.1557/adv.2016.245, Published online: 11 April 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116002450 How to cite this article: Harsha K. Puppala, Anthony T. Pelton and Robert A. Mayanovic A Comparative Characterization Study of Molybdenum Oxide Thin Films Grown Using Femtosecond and Nanosecond Pulsed Laser Deposition. MRS Advances, Available on CJO 2016 doi:10.1557/adv.2016.245 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.245
A Comparative Characterization Study of Molybdenum Oxide Thin Films Grown Using Femtosecond and Nanosecond Pulsed Laser Deposition Harsha K. Puppala, Anthony T. Pelton, Robert A. Mayanovic Department of Physics, Astronomy, and Materials Science, Missouri State University, 901 South National Avenue, Springfield, MO 65897, USA. ABSTRACT Group 6 transition metal oxide thin films are in large demand for photocatalysis, heterogeneous catalysis, fuel cell, battery and electronic applications. Pulsed laser deposition offers an inexpensive method for the preparation of nanostructured thin films that may be suitable for heterogeneous catalysis. We have synthesized molybdenum oxide thin films using two types of pulsed laser deposition (PLD). The first method utilizes femtosecond laser-based PLD (f-PLD) while the second method uses an excimer (nanosecond) laser-based PLD (n-PLD). The PLD films have been deposited using f-PLD and, separately, n-PLD on glass and silicon substrates and subsequently annealed to 450 °C for up to 20 hours in air using a Linkam stage. SEM, XRD and Raman spectroscopic characterization shows that the f-PLD films are substantially more textured and partially crystalline prior to annealing whereas the n-PLD-grown thin films are much smoother and predominantly amorphous. A 3-dimensional nano-crystalline structure is evident in the post-annealed f-PLD synthesized thin films, which is desirable for catalytic applications. XPS elemental analysis shows that the stoichiometry of the f-PLD and nPLD thin films is consistent with the presence of MoO2 and MoO3. Our results are discussed in terms of thin film growth models suitable for f-PLD vs n-PLD. INTRODUCTION The transition metal oxide thin films have a significant role to play in major energy applications like photocatalysis, heterogeneous catalysis, electrochromic and photochromic devices etc. [1]. Molybdenum trioxide (MoO3) is highly useful as a selective catalyst for hydrocarbon oxidation [2, 3]. Crystalline molybdenum trioxide occurs in two major crystal phases, namely orthorhombi
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