scholarly journals Undoped and Nickel-Doped Zinc Oxide Thin Films Deposited by Dip Coating and Ultrasonic Spray Pyrolysis Methods for Propane and Carbon Monoxide Sensing Applications

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6879
Author(s):  
Tangirala Venkata Krishna Karthik ◽  
María de la Luz Olvera ◽  
Arturo Maldonado ◽  
Rajesh Roshan Biswal ◽  
Heberto Gómez-Pozos
Keyword(s):  
Thin Films ◽  
Carbon Monoxide ◽  
Zinc Oxide ◽  
Spray Pyrolysis ◽  
Size Distribution ◽  
Ultrasonic Spray Pyrolysis ◽  
Dip Coating ◽  
Zno Films ◽  
Ultrasonic Spray ◽  
Deposition Techniques

Undoped and nickel-doped zinc oxide thin films were deposited on sodalime glass substrates by utilizing dip coating and ultrasonic spray pyrolysis deposition techniques. In both cases zinc acetate and nickel acetylacetonate were used as zinc precursor and nickel dopant source, respectively. XRD analysis confirms the ZnO wurtzite structure with (002) as the preferential orientation.SEM studies show the formation of two types of morphologies, primarily a porous spherical grains with a grain size distribution from 40 to 150 nm and another, rose-like structures with size distribution from 30 to 200 nm, based on different deposition techniques utilized. The elemental depth profiles across the films were investigated by the secondary-ion mass spectrometry (SIMS). Different gas sensing responses of all ZnO films were obtained for both propane and carbon monoxide gases, at different gas concentrations and operating temperatures. The highest sensing response (~6) for undoped ZnO films was obtained for films deposited by ultrasonic spray pyrolysis (USP). Nevertheless, the highest sensing response (~4 × 104) for doped ZnO films was obtained for films deposited by dip coating method. The behavior of sensing responses is explained in detail based on the morphological properties and the amount of Ni impurities incorporated into the crystal lattice.

Fabrication of Zinc Oxide Thin Film Sensor for Carbon Monoxide Gas Detection by Ultrasonic Spray Pyrolysis

2018 ◽  
Vol 24 (8) ◽  
pp. 5812-5815
Author(s):  
Vinoth Kumar Jayaraman ◽  
Jacob Morales Bautista ◽  
Rajesh Roshan Biswal ◽  
Monserrat Bizarro ◽  
Arturo Maldonado Alvarez ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Carbon Monoxide ◽  
Zinc Oxide ◽  
Spray Pyrolysis ◽  
Milling Time ◽  
Ultrasonic Spray Pyrolysis ◽  
Oxide Thin Film ◽  
Ultrasonic Spray ◽  
Gas Response

Here, we have reported the thin film preparation of undoped zinc oxide thin films by ultrasonic spray pyrolysis and their gas response characteristics of carbon monoxide (CO). Four thin films of zinc oxide (ZnO) were deposited on glass substrates using a starting solution prepared from a ball milled precursor. A 0.2 M of zinc precursor (zinc acetylacetonate) was grinded using ball milling for different durations (15, 30, 45, and 60 min) and its effect was studied on gas sensing characteristics along with structural and morphological. Structural properties indicated that all the undoped ZnO thin films were grown with (002) plane orientation irrespective of milling conditions. Surface morphologies acquired from scanning electron microscopy revealed that milling time influenced in modifying the morphology. The films were formed with different types of hexagonal structures such as irregular, broken, twisted, and trigonal tipped hexagonals. Additionally, gas response measurements showed that films prepared using less milling time exhibited highest CO gas response, among other films.

Effect of Solution Concentration on ZnO/ZnAl2O4 Nanocomposite Thin Films Formation Deposited by Ultrasonic Spray Pyrolysis on Glass and Si(111) Substrates

2020 ◽  
Vol 63 ◽  
pp. 10-30
Author(s):  
Sabrina Iaiche ◽  
Chahra Boukaous ◽  
David Alamarguy ◽  
Abdelkader Djelloul ◽  
Djamel Hamana
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Near Infrared ◽  
Ultrasonic Spray Pyrolysis ◽  
Solution Concentration ◽  
Molar Ratio ◽  
Zno Films ◽  
Glass Layer ◽  
Ultrasonic Spray ◽  
Vis Spectroscopy

A complex ZnO/ZnAl2O4 heterostructures thin films on glass and Si (111) substrates have been successively obtained by a soft ultrasonic spray pyrolysis (USP) method deposition using the Zn/Al molar ratios concentrations of 0.07/0.13 and 0.1/0.1, respectively. According to (XRD) an ordered zinc oxide (ZnO) and zinc aluminate (ZnAl2O4) structures deposited onto glass from the air annealing at 500 °C during 2 hours was observed and confirmed by the (EDX), (FTIR) and Raman spectroscopy techniques. The estimated crystallites size and stress values of ZnO and ZnAl2O4 in the ZnO/ZnAl2O4/glass film were 19 nm/0.469 GPa and 11 nm/-0.292 GPa, respectively. The lower Zn/Al molar ratio around 0.035/0.06 produced only ZnO as a single phase, suggesting the Al insufficient quantity. The Si (100) substrate with 0.07 Zn molarity conducted to the Zn2SiO4/ZnO/ZnAl2O4 composite. The Raman integrated intensity bands of ZnO and ZnAl2O4 increases with increasing Zn to Al molar ratio (0.1/0.1 comparatively to 0.07/0.13). The ZnO&ZnAl2O4 crystallinity enhances as Zn molarity increases. The ZnO films in the composites grow with (002) texture. The TC(hkl) value indicated that ZnAl2O4 in the ZnO/ZnAl2O4/glass layer is polycrystalline preferentially oriented along the (311) plane. Spinel ZnAl2O4 oxide onto Si (111) substrate grown according to the (220) orientation. Crystallites are larger in ZnO/ZnAl2O4/Si than in ZnO/ZnAl2O4/glass. The ZnO/ZnAl2O4 film onto glass substrate is transparent in the visible and near infrared regions and sensitive to UV absorption, as characterized by UV-Vis spectroscopy. The ZnO and ZnAl2O4Egvalues in the ZnO/ZnAl2O4/glass composite were 3.25 and 3.88 eV, respectively.

scholarly journals Effect of the Substrate Movement on the Optical Properties of ZnO Thin Films Deposited by Ultrasonic Spray Pyrolysis

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Ebru Gungor ◽  
Tayyar Gungor
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Spray Pyrolysis ◽  
Quartz Substrate ◽  
Compressive Strain ◽  
Ultrasonic Spray Pyrolysis ◽  
Film Deposition ◽  
Zno Thin Films ◽  
Zno Films ◽  
Ultrasonic Spray

Using a modified ultrasonic spray pyrolysis (USP) system, ZnO thin films were deposited on the substrate moved back and forth (ZO1) and rotated (ZO3) as well as fixed (ZO2) in the conventional USP technique. Prepared thin films are pure ZnO with a preferred crystalline orientation of (0 0 2) in the hexagonal wurtzite structure. Diffraction angle shift implies a decrease lattice parameter alongc-axis anda-axis 0.2% and 0.3%, respectively. Maximum strain has been found for ZO1 which is about (−) 0.17%. These strain values show that presence of compressive strain due to moving substrates as depositing ZnO films. The film deposition process on the rotated quartz substrate is provided to obtain the thinner film. The grain size and root-mean- square value of roughness increase with thickness. Strong UV emission was observed at ∼390 nm assigned to the band gap transition from photoluminescence measurements. Energy shifted about 39 meV for ZO3 sample with respect to that of ZO2 film deposited in conventional USP system. This behaviour is confirmed with (002) diffraction peak shifting. So, the compressed lattice will provide a wider band gap for these films.E2phonon frequency values have not given a considerable shifting.

Study on the growth and optical properties of ZnO thin films fabricated by ultrasonic spray pyrolysis

2018 ◽  
Vol 32 (29) ◽  
pp. 1850351 ◽  
Author(s):  
Weiguang Yang ◽  
Zhen Yang ◽  
Ding Li ◽  
Xiaoying Zhang ◽  
Ziliang Zhou ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spray Pyrolysis ◽  
Quartz Substrate ◽  
Ultrasonic Spray Pyrolysis ◽  
Zno Thin Films ◽  
Zno Films ◽  
Expansion Formula ◽  
Ultrasonic Spray ◽  
Structure Formula

In this paper, ZnO nanofilms are prepared on quartz substrate by ultrasonic spray pyrolysis (USP) technology. The effects of substrate temperature and deposition time on the micro-structural, morphological and optical properties of ZnO thin films are investigated in detail. Measurements indicate that the growth process of the film is as follows: Micro grains accumulation [Formula: see text] grains’ expansion [Formula: see text] grow into certain nanostructures under different temperature. Nanostructures of the film are as follows: Irregular broken hexagonal-like structure ([Formula: see text]C); coexisting of broken hexagonal- and sheet-like structure (450–500[Formula: see text]C); regular closed packed sheets-like structure ([Formula: see text]C). In addition, all results show that RMS roughness of the films is less than 20 nm. Moreover, the visible transmittance of these samples is higher than 90%. Which display that ZnO films with low roughness and excellent optical properties can be also fabricated by low-cost USP method.

Deposition of ZnO:Al Thin Films by Ultrasonic Spray Pyrolysis

2010 ◽  
Vol 150-151 ◽  
pp. 1617-1620 ◽  
Author(s):  
Lin Dong ◽  
Teng Fei Pei ◽  
Hong Qing Li ◽  
Da Yan Xu
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Spray Pyrolysis ◽  
Doping Level ◽  
Spray Pyrolysis Technique ◽  
Ultrasonic Spray Pyrolysis ◽  
Atmospheric Environment ◽  
Molar Ratio ◽  
Zno Films ◽  
Ultrasonic Spray

Transparent conducting Al-doped ZnO films were prepared by ultrasonic spray pyrolysis technique on amorphous glass substrates under atmospheric environment with substrate temperature ranging from 350 to 500 , and Al/ZnO molar ratio of 1, 3 and 5 %. The impacts of the substrate temperature and doping level on structural, optical and electrical properties of the ZnO:Al thin films were investigated. The texture coefficient calculated from XRD data indicates that the substrate temperature at 450 and the doping level of 3 at.% is beneficial for crystal growth along (002) orientation. The Band gap (Eg) and Urbach parameter (E0) deduced by the optical absorption edge increases and decreases with the increase of Al doping level, respectively. The increase in sheet resistance is assumed to be associated with the decrease in preferential orientation and formation of Al2O3-x clusters.

Boron-doped zinc oxide thin films fabricated by ultrasonic spray pyrolysis

2012 ◽  
Author(s):  
Shao-Yi Lee ◽  
Wen-How Lan ◽  
Wei-Min Chao ◽  
Chun-Wei Tsai ◽  
Ming-Chang Shih ◽  
...  
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Oxide Thin Films ◽  
Ultrasonic Spray ◽  
Boron Doped
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