Indian Science Technology and Engineering facilities Map
 
Supplier Map
Service Map

Publications

Publication Details

Applicant:
Central University of Tamil Nadu 
Author:
Kevin V. Alex, A. R. Jayakrishnan, Ajeesh Kumar S, A. Sulthan Ibrahim, K. Kamakshi, J. P. B. Silva, K. C. Sekhar and M. J. M. Gomes 
Corresponding Authors:
J. P. B. Silva, K. C. Sekhar 
DOI #:
https://doi.org/10.1088/2053-1591/ab0f7a 
Title:
Substrate temperature induced effect on microstructure, optical and photocatalytic activity of ultrasonic spray pyrolysis deposited MoO3 thin films 
Journal:
Materials Research Express 
Year:
2019 
Volume:
Page:
066421 
Keywords:
Semiconductor thin films, MoO3, Spray pyrolysis, Raman spectroscopy, Photodegradation, Substrate temperature 
Abstract:
In this work, the substrate temperature (TS) effect on the microstructure, optical and photocatalytic activity of spray pyrolysis deposited transparent molybdenum trioxide (MoO3) thin films is studied. Microstructure analysis reveals the coexistence of hexagonal and orthorhombic phases when TS ≤ 300 °C and the existence of the orthorhombic phase only when TS ≥ 400 °C. The SEM analysis suggests that the films consist of rod and spherical shaped grains. The dimensions of rods and spheres are found to be sensitive to TS and can be correlated to strain. The band gap is increased from 3.06 to 3.46 eV with TS. Photoluminescence analysis reveals that the emission corresponds to defects increased with Ts. The photocatalytic activity of MoO3 films deposited at various TS is evaluated by using 0.5 mM Rhodamin-B (Rh-B) dye aqueous solution as a template. The film deposited at 500 °C shows the maximum photodegradation efficiency due to its high structural sensitivity, surface selectivity and catalytic anisotropy. The variation in efficiency with TS is discussed based on the band bending effect, crystallographic orientation, surface morphology, defects concentration and light absorption capacity. The effect of irradiation time on photodegradation efficiency is also investigated. The MoO3 film shows photodegradation efficiency of 91% after two hour illumination and makes it suitable for photocatalytic applications. 
Entered by:
Koppole Chandra Sekhar on 2020-09-02 
 
THE VISION
THE MISSION
ABOUT I-STEM
It has always been the basic tenet of the Government of India, in generously funding R&D efforts at academic institutions over the years, that facilities established through such support be made available to those needing them and qualified to make use of them for their own research work
read more >>

However, this was never easy or straightforward for, among other reasons, there was no ready source of information of what facility was available and where. Thanks to the Web, it is much easier today to have a national and regional “inventory of resources”, so as to match users with the resources they need, and to do all this in an efficient and transparent manner.

This can lead to a leap in R&D productivity and greatly enhance the effectiveness of public investment. This is the motivation behind I-STEM.
read less <<
Visitor Hit Counter
Hosted at Indian Institute of Science
Copyright © 2024 I-STEM. All rights reserved.
Audited by: STQC Bengaluru.