Preparation and photocatalytic properties of nanometer TiO2 thin films by improved ultrasonic spray pyrolysis

In this study, we deposited TiO2 thin films onto borosilicate glass by ultrasonic spray pyrolysis at 350 and 450 °C. The aim of study is to determine the effect of deposition temperature on photocatalytic activity of TiO2 thin films and to investigate the performance of TiO2 thin films on photocatalytic degradation of methyl tert-butyl ether (MTBE), acetone, acetaldehyde, and heptane as functions of different operating parameters. TiO2 thin films deposited at 350 and 450 °C have a thickness value of 190 and 330 nm, respectively. All as-prepared TiO2 films possess an anatase crystalline structure. According to the X-ray photon spectroscopy (XPS) study, the TiO2 thin film deposited at 350 °C showed a higher amount of oxygen vacancies and hydroxyl groups on the film surface after UV treatment. The aged-TiO2 thin film deposited at 350 °C showed a water contact angle (WCA) value of 0° after 10 min UV irradiation, showing superhydrophilic surface behavior. The TiO2 film deposited at 350 °C exhibited the highest amount of conversion of MTBE (100%). The results also showed that TiO2 films are capable of photocatalytic degradation of MTBE (100%) and acetaldehyde (approx. 80%) in humid air conditions and high airflow rate. The visible-light-activity of TiO2 thin films was tested with 5 ppm MTBE and acetone. TiO2 thin films deposited at 350 °C with a surface area of 600 cm2 showed 60% of MTBE and 33% of acetone degradation under VIS light.

Download Full-text

TiO2 thin films by ultrasonic spray pyrolysis

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/503/1/012006 ◽

2019 ◽

Vol 503 ◽

pp. 012006

Author(s):

Z Chen ◽

I Dündar ◽

I Oja Acik ◽

A Mere

Keyword(s):

Thin Films ◽

Spray Pyrolysis ◽

Ultrasonic Spray Pyrolysis ◽

Tio2 Thin Films ◽

Ultrasonic Spray

Download Full-text

Sunlight active antibacterial nanostructured N-doped TiO2 thin films synthesized by an ultrasonic spray pyrolysis technique

RSC Advances ◽

10.1039/c2ra21024j ◽

2012 ◽

Vol 2 (28) ◽

pp. 10639 ◽

Cited By ~ 12

Author(s):

N. C. Raut ◽

Tom Mathews ◽

P. K Ajikumar ◽

R. P. George ◽

S. Dash ◽

...

Keyword(s):

Thin Films ◽

Spray Pyrolysis ◽

Spray Pyrolysis Technique ◽

Ultrasonic Spray Pyrolysis ◽

Tio2 Thin Films ◽

Doped Tio2 ◽

Ultrasonic Spray Pyrolysis Technique ◽

Ultrasonic Spray

Download Full-text

Thickness Effect on Photocatalytic Activity of TiO2 Thin Films Fabricated by Ultrasonic Spray Pyrolysis

Catalysts ◽

10.3390/catal10091058 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1058

Author(s):

Ibrahim Dundar ◽

Arvo Mere ◽

Valdek Mikli ◽

Malle Krunks ◽

Ilona Oja Acik

Keyword(s):

Thin Films ◽

Photocatalytic Activity ◽

Film Thickness ◽

Stearic Acid ◽

Spray Pyrolysis ◽

Ultrasonic Spray Pyrolysis ◽

Tio2 Films ◽

Tio2 Thin Films ◽

Ultrasonic Spray ◽

Self Cleaning

In this study, TiO2 thin films were deposited by ultrasonic spray pyrolysis from solutions with concentrations of 0.1 and 0.2 M. The deposition temperature was adjusted at 350 °C and all samples were annealed at 500 °C for 1 h in air. The thickness of TiO2 films was changed in the range of 50 to ca. 800 nm by varying the number of spray cycles from 1 to 21 and the solution concentration. The results showed that the mean crystallite size of the anatase structure, the surface roughness, and light absorption increased with the film thickness. The effect of film thickness on the photocatalytic activity was investigated with the photodegradation of stearic acid under UV-A irradiation. The optimal thickness of TiO2 films fabricated by ultrasonic spray pyrolysis for photocatalytic self-cleaning applications was in the range of 170–230 nm, indicating a ca. 2.6 times-higher photocatalytic self-cleaning activity compared to the reference sample, Pilkington ActivTM. The photocatalytic results showed that the 190 nm-thick TiO2 film deposited from the 0.1 M solution applying seven spray cycles exhibited the finest grain structure and maximum photocatalytic activity, leading to 94% of stearic acid degradation in 180 min under UV-A light with the reaction rate constant k = 0.01648 min−1.

Download Full-text

Enhanced Visible and Ultraviolet Light-Induced Gas-Phase Photocatalytic Activity of TiO2 Thin Films Modified by Increased Amount of Acetylacetone in Precursor Solution for Spray Pyrolysis

Catalysts ◽

10.3390/catal10091011 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1011

Author(s):

Jekaterina Spiridonova ◽

Arvo Mere ◽

Malle Krunks ◽

Merilin Rosenberg ◽

Anne Kahru ◽

...

Keyword(s):

Thin Films ◽

Photocatalytic Activity ◽

Spray Pyrolysis ◽

Flow Reactor ◽

Ultrasonic Spray Pyrolysis ◽

Precursor Solution ◽

Molar Ratio ◽

Tio2 Thin Films ◽

Ultrasonic Spray ◽

Great Possibility

TiO2 thin films, modified by acetylacetone (AcacH) in solution, were deposited on glass substrate by ultrasonic spray pyrolysis and tested for photocatalytic activity in a multi-section continuous flow reactor by degradation of acetone and acetaldehyde under ultraviolet and visible light. The increase in molar ratio of AcacH in respect of titanium (IV) isopropoxide (TTIP) from 1:5 to 1:8 modified the electronic structure of the films, favoring enhanced photocatalytic activity. The photocatalytic activity was enhanced approximately twofold on the film with molar ratio 1:8 under both irradiations; the film completely oxidized 10 ppm of acetone and acetaldehyde. The photocatalytic efficacy of TiO2 films in oxidation of air pollutants was three times higher compared to the industrial glass Pilkington ActivTM. Moreover, all the synthesized films indicate antibacterial efficiency against E. coli of over 99% under ultraviolet. TiO2 film, with TTIP:AcacH molar ratio 1:8 having great possibility for its commercial use as a material for indoor air purification.

Download Full-text

Ultrasonic Spray Pyrolysis Deposition of SDS Surfactant Assisted Copper Oxide Thin Films

i-manager’s Journal on Future Engineering and Technology ◽

10.26634/jfet.9.4.2744 ◽

2014 ◽

Vol 9 (4) ◽

pp. 17-23

Author(s):

Iqbal Singh ◽

◽

Taminder Singh ◽

Keyword(s):

Thin Films ◽

Copper Oxide ◽

Spray Pyrolysis ◽

Ultrasonic Spray Pyrolysis ◽

Oxide Thin Films ◽

Ultrasonic Spray ◽

Spray Pyrolysis Deposition ◽

Sds Surfactant ◽

Surfactant Assisted

Download Full-text

Strong texture tuning along different crystalline directions in glass-supported CeO2 thin films by ultrasonic spray pyrolysis

Scientific Reports ◽

10.1038/s41598-021-81353-x ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Inti Zumeta-Dubé ◽

José Manuel García Rangel ◽

Jorge Roque ◽

Issis Claudette Romero-Ibarra ◽

Mario Fidel García Sánchez

Keyword(s):

Thin Films ◽

Spray Pyrolysis ◽

Spray Pyrolysis Technique ◽

Morphological Characteristics ◽

Ultrasonic Spray Pyrolysis ◽

Cost Effective ◽

Growth Direction ◽

Large Area ◽

Smart Windows ◽

Ultrasonic Spray

AbstractThe strong facet-dependent performance of glass-supported CeO2 thin films in different applications (catalysis, smart windows, etc.) has been the target of diverse fundamental and technological approaches. However, the design of accurate, cost-effective and scalable methods with the potential for large-area coverage that produce highly textured glass-supported CeO2 thin films remains a technological challenge. In the present work, it is demonstrated that under proper tuning conditions, the ultrasonic spray pyrolysis technique enables one to obtain glass-supported polycrystalline CeO2 films with noticeable texture along both the (100) and (111) directions, as well as with randomly oriented crystallites (no texture). The influence of flow rates, solution molarity, and substrate temperature on the texture and morphological characteristics, as well as optical absorption and Raman response of the deposited films, is evaluated. The obtained results are discussed on the basis of the combined dependence of the CeO2-exposed surfaces on the thermodynamic stability of the corresponding facets and the reaction kinetics, which modulate the crystallite growth direction.

Download Full-text