Electrospray Deposition of ZnO Thin Films and Its Application to Gas Sensors

Li, Wenwang; Lin, Jinghua; Wang, Xiang; Jiang, Jiaxin; Guo, Shumin; Zheng, Gaofeng

doi:10.3390/mi9020066

Cited by 24 publications

(14 citation statements)

References 16 publications

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“…This is in agreement with Vu et al who found that low flow rate (0.5 ml/hr) could produce small diameters of particles (4.347 μm), which are generated by strong Coulomb fission. Similar phenomena was reported by Li et al, they found that by increasing the flow rate from 20 to 100 μl/hr, average diameter of particles increases from 7.42 to 12.24 μm. From this result, evaporation of solvents during the electrospraying process plays an important role in producing smaller diameter of particles.…”

Section: Resultsmentioning

confidence: 99%

Electrospray flow rate influenced the sized of functionalized soot nanoparticles

Surib

Paad

2020

Asia-Pacific J Chem Eng

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A common method in the synthesis of functionalized carbon particles such as laser ablation of graphite required time and complicated method. Therefore, electrospraying method was used to synthesize functionalized candle soot particles. Electrospraying method uses electric force to produce monodispersed micro and nanoparticles. Thus, the flow rates and voltages were manipulated to investigate the size of functionalized soot particles and Taylor cone-jet formation. In this study, soot was collected through direct burning of candles and functionalized with 1 M of nitric acid in 9 hr. The electrospray was set up at 27 C by applied high voltage 6.6 to 8.7 kV to the needle (23 G) with an internal diameter of 0.34 mm, aluminum foil as a collector, and tip to collector distance of 10 cm. The process parameters were manipulated by varying the flow rate from 0.3, 0.5, and 0.8 to 1.0 ml/hr. The functionalized soot particles size and morphology were examined using a digital microscope and processed using ImageJ software. The particles diameter increased from 1.23 up to 2.46 μm when the flow rate increased from 0.3 to 1.0 ml/hr. This is due to increase volume of solution ejected from the needle, which inhibits the solvent from evaporating. K E Y W O R D Scandle soot, electrospraying, functionalized soot, nanoparticles, Taylor cone

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Section: Resultsmentioning

confidence: 99%

Electrospray flow rate influenced the sized of functionalized soot nanoparticles

Surib

Paad

2020

Asia-Pacific J Chem Eng

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“…[ 228,229 ] Electrospray is a kind of liquid atomization with electrical field disrupting the liquid cone to easily fabricate large‐area thin films in nanoscale thickness. [ 230,231 ]…”

Section: Techniques For Direct Fabrication Of Curved Electronicsmentioning

confidence: 99%

Fabrication Techniques for Curved Electronics on Arbitrary Surfaces

Tian

Luo

et al. 2020

Adv Materials Technologies

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Curved electronics, which are better coordinated and blended with the natural world due to the characteristics of large contact area, high space adaptability, etc., have been widely used in a quantity of areas ranging from conformal curved antennas and sensors in detection and measurement, to artificial smart skin of aerospace. Recent developments in curved electronics have made an increasing progress to the historic drawbacks of conventional planar electronics, however significant challenges still exist. Here, the main kinds of conformal fabrication technologies, including transfer printing, assembly techniques, curved lithography, conformal inkjet printing, 3D printing, and laser direct writing, are reviewed to realize manufacturing deformable/undeformable electronics on curved or arbitrary surfaces. The processes and features of each technology are comprehensively summarized together with their progress and potential values. Finally, the challenges and opportunities for fabricating conformal electronics on arbitrary surfaces are also discussed.

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“…Electrostatic setups with horizontal [17] and vertical configurations [18] have already been used and amorphous or crystalline films with diverse properties have been deposited using different deposition parameters. The effects of experimental parameters on jet characteristics and electrosprayed patterns and some properties of ZnO films are studied [19][20][21]. Typically zinc acetate and zinc nitrate are used as organic sols, and water, ethanol, isopropanol, 2-methoxy ethanol, and propylene glycol are used as solvents.…”

Section: Introductionmentioning

confidence: 99%

Effect of Substrate Temperature on the Microstructural, Morphological, and Optical Properties of Electrosprayed ZnO Thin Films

Маринов

Strijkova

Vasileva

et al. 2018

Advances in Condensed Matter Physics

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Polycrystalline ZnO thin films were prepared on silicon substrates using electrospray method with vertical setup. Water and ethanol were used as solvents for zinc acetate dehydrate and no postdeposition annealing was required for formation of ZnO. The influence of substrate temperature in the range of 150–250°C on surface morphology and roughness was studied by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and optical profilometry. An improvement of surface quality and smoothing of the films with temperature were obtained. X-ray diffraction measurements revealed that, at all investigated substrate temperatures, the films were polycrystalline with crystallites’ sizes decreasing with temperature. Besides, the preferred crystal orientation varies with the substrate temperature. The analysis of surface chemical composition and oxidation state was performed with X-ray photoelectron spectroscopy (XPS). It was shown that, at substrate temperature of 200°C, the deposited ZnO films were closest to the stoichiometric ones. In general, the films at 150°C were oxygen-deficient, while at other studied temperatures, the films had excess of oxygen more pronouncedly at 200°C. Spectral ellipsometric measurements confirmed that the structural disorder is the highest at 150°C and improves with temperature. Refractive indexes for films at 200°C and 250°C are almost the same, 1.97 and 1.93, respectively, at wavelength of 600 nm, while for the sample deposited at 150°C, the refractive index is substantially lower, 1.67. The optical band gap is slightly influenced by the substrate temperature: 3.27 eV at 150°C and 3.32 eV at 200°C.

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Electrospray Deposition of ZnO Thin Films and Its Application to Gas Sensors

Cited by 24 publications

References 16 publications

Electrospray flow rate influenced the sized of functionalized soot nanoparticles

Electrospray flow rate influenced the sized of functionalized soot nanoparticles

Fabrication Techniques for Curved Electronics on Arbitrary Surfaces

Effect of Substrate Temperature on the Microstructural, Morphological, and Optical Properties of Electrosprayed ZnO Thin Films

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