Study of a sol–gel precursor and its evolution towards ZnO

Gómez-Núñez, Alberto; López, Concepción; Alonso-Gil, Santiago; Roura, P.; Vilà, A.

doi:10.1016/j.matchemphys.2015.06.038

Cited by 11 publications

(23 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to previous observations on the EA ink [14], ZnO appears after the first decomposition step with maximum decomposition rate in the 230-270 ºC range depending on the particular stabilizer.…”

Section: Tg/dsc Experimentssupporting

confidence: 59%

See 1 more Smart Citation

Comparison of the thermal decomposition processes of several aminoalcohol-based ZnO inks with one containing ethanolamine

Gómez-Núñez

Roura

López

et al. 2016

Applied Surface Science

Self Cite

View full text Add to dashboard Cite

Four inks for the production of ZnO semiconducting films have been prepared with zinc acetate dihydrate as precursor salt and one among the following aminoalcohols: aminopropanol (APr), aminomethyl butanol (AMB), aminophenol (APh) and aminobenzyl alcohol (AB) as stabilizing agent. Their thermal decomposition process has been analyzed in situ by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and evolved gas analysis (EGA), whereas the solid product has been analysed ex-situ by X-ray diffraction (XRD) and infrared spectroscopy (IR). Although, except for the APh ink, crystalline ZnO is already obtained at 300 ºC, the films contain an organic residue that evolves at higher temperature in the form of a large variety of nitrogen-containing cyclic compounds. The results indicate that APr can be a better stabilizing agent than ethanolamine (EA). It gives larger ZnO crystal sizes with similar carbon content. However, a common drawback of all the amino stabilizers (EA included) is that nitrogen atoms have not been completely removed from the ZnO film at the highest temperature of our experiments (600 ºC).

show abstract

Section: Tg/dsc Experimentssupporting

confidence: 59%

“…Firstly, because its temperature is not correlated with the stabilizer boiling point (300 ºC for APh and 160 ºC for AB). Secondly, because during ink formation the stabilize [14]. or [20].…”

Section: Tg/dsc Experimentsmentioning

confidence: 99%

Comparison of the thermal decomposition processes of several aminoalcohol-based ZnO inks with one containing ethanolamine

Gómez-Núñez

Roura

López

et al. 2016

Applied Surface Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…The ZnO precursor was prepared by stabilizing zinc acetate dihydrate (Zn(CH 3 COO) 2 •2H 2 O, ZAD, from Panreac) with ethanolamine (H 2 NCH 2 CH 2 OH, EA, from Acrös Organics). Then, 2methoxyethanol (CH 3 O(CH 2 ) 2 OH, ME, from Aldrich) was added as a solvent to prepare the ink, following the method reported in previous work 23 . Some of these mixtures were stored at various room conditions for some weeks, showing evidences of chemical degradation.…”

Section: Materials and Proceduresmentioning

confidence: 99%

“…After an introduction to the materials and methods, the experimental results are correlated with Density Functional Theory (DFT), which is known to be a useful and powerful tool to understand the evolution of many organic molecules, condensed substances and even metal organic complexes. A final calculation allows describing in detail the equilibrium between the two most important forms, since, as already shown 23 , the reaction of EA with ZAD produces tetramers ([Zn] 4 , Figure 1) that are not stable in solution. Our results provide a better understanding of the ink degradation and, consequently, allow optimizing the technological processes to prepare precursors, in order to obtain good ZnO films 24 .…”

Section: Introductionmentioning

confidence: 99%

Role of Ethanolamine on the Stability of a Sol–Gel ZnO Ink

et al. 2017

View full text Add to dashboard Cite

This work presents a detailed structural and chemical characterization of the system formed by zinc acetate dihydrate (ZAD) and ethanolamine (EA) with methoxyethanol (ME), in order to describe its stability. The origin of the mixture degradation during storage at room conditions is analyzed. Theoretical calculations of the frontier orbitals of the system ZAD plus EA under interaction with ME and CO 2 are used to deduce energy levels and stability of the different molecules appearing in the ZAD-EA-ME system. The models were tested as potential energy minimum and their photo-absorption spectra were simulated. The dimerization process leading from the simplest configuration to the most abundant one is also theoretically analyzed and used to describe the effect of the nuclearity raise on the mixture stability. Our results explain the experimental observations and provide a better understanding of the role played by EA in the formation of ZnO and, consequently, allow optimizing the technological processes to prepare these films.

show abstract

“…Nanostructured ZnO have been synthesized by distinct methods, such as ultrarapid sonochemical 6 , hydrothermal synthesis 7 , microwave assisted irradiate 8 , sol-gel 9,10 , and aqueous solution methods 11 . In all these cases, the materials properties are strongly dependent on the synthesis parameters.…”

Section: Introductionmentioning

confidence: 99%

Annealing Effects on the Structural and Optical Properties of ZnO Nanostructures

et al. 2018

View full text Add to dashboard Cite

ZnO nanostructures were synthesized by a proteic sol-gel method, using zinc nitrate hexahydrate and gelatin as precursors. Size and shape evolution of ZnO nanostructures were achieved by annealing temperature in the range 250-1000 ºC. The crystalline structure, morphology and optical properties of the ZnO nanoparticles were characterized by X-Ray Diffraction (XRD), Raman Spectroscopy (RS), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and room temperature Photoluminescence (PL). The result of structural characterization shows the formation of platelets and nanorods in the micro-scale and ZnO nanostructures with high quality hexagonal wurtzite crystal. Sharp peaks in RS after annealing temperature, related to wurtzite structure, were observed corroborating with XRD and TEM measurements. Room temperature PL spectra showed two contribution bands which peaked at ~380 nm, originating from the recombination of free excitons, and ~520 nm corresponding to the impurities and structural defects, like oxygen vacancies and zinc interstitial. The effects of annealing temperature in the structural and optical properties are detailed and the results compared among the experimental techniques. The high quality of the samples obtained by an alternative organic precursor method opens a low-cost route to technological applications of zinc oxide.

show abstract

Study of a sol–gel precursor and its evolution towards ZnO

Cited by 11 publications

References 42 publications

Comparison of the thermal decomposition processes of several aminoalcohol-based ZnO inks with one containing ethanolamine

Comparison of the thermal decomposition processes of several aminoalcohol-based ZnO inks with one containing ethanolamine

Role of Ethanolamine on the Stability of a Sol–Gel ZnO Ink

Annealing Effects on the Structural and Optical Properties of ZnO Nanostructures

Contact Info

Product

Resources

About