Effects of stabilizer ratio on photoluminescence properties of sol-gel ZnO nano-structured thin films

Boudjouan, F.; Chelouche, A.; Touam, Tahar; Djouadi, D.; Khodja, S.; Tazerout, Mohand; Ouerdane, Y.; Hadjoub, Z.

doi:10.1016/j.jlumin.2014.09.026

Cited by 38 publications

(15 citation statements)

References 43 publications

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“…Firstly, MEA acts as complexing agent for zinc and cobalt when preparing the growth solution ([Zn(MEA) m ] 2+ , [Co(MEA) m ] 2+ /[Co(MEA)(OH) x ] 2−x ). Secondly, since higher MEA concentrations in the growth solution were found to increase the ZnO growth, MEA is believed to exhibit a growth‐directing function similar to the results of other groups . Additionally, MEA is crucial for the doping of the rods during the first growth stage (1GS).…”

Section: Resultssupporting

confidence: 57%

One‐Pot Synthesis of Co(OH)₂‐ and/or Co₃O₄‐Decorated Cobalt‐Doped ZnO Nanorod Arrays and Their Potential as (Photo‐)Anode Materials

et al. 2019

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Metal oxides like zinc oxide (ZnO) are particularly promising materials to be used in core technologies for the generation and storage of clean energy such as batteries, photovoltaics or solar fuel production and solar water splitting. The deposition of the electrode materials used in these applications should be as cost effective as possible, while maintaining good device characteristics. Here, a simple low-temperature solution-based deposition method is reported that allows for the growth of high surface area, cobalt-doped ZnO nanorod-arrays decorated with cobaltic over-coatings. Control over the visible light absorption and the nature of the cobaltic over-coating (e. g. Co (OH) 2 and/or Co 3 O 4 ) can be achieved by changing the growth parameters during the one-pot synthesis. Focusing on the evaluation of the underlying growth principles and resulting material properties, the study discusses the crucial role of the organic growth modifier used (monoethanolamine) as a complexing-, growth-directing-and reducing agent. Furthermore, the (solar driven) oxidation of water is taken as an example reaction in order to gain further insight into the functionality of the structures. Accounting for the temperature dependent breakdown of metal-amine complexes, a two-stage growth mechanism is proposed that will allow the optimization of the resulting structures for individual applications, but which could also prove valuable for other metal-oxide/hydroxide material combinations.[a] J. Kegel, I. M. Povey, Prof. M. E. Pemble

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Section: Resultssupporting

confidence: 57%

One‐Pot Synthesis of Co(OH)₂‐ and/or Co₃O₄‐Decorated Cobalt‐Doped ZnO Nanorod Arrays and Their Potential as (Photo‐)Anode Materials

et al. 2019

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“…Stabilizer ratios lower than 1:1 exhibited higher transmittance compared to sol-gels having higher MEA to Zn ratio. Although ratios having greater transmittance values are preferred, in such cases using lower amounts of stabilizer leads to insufficient interaction between the ZnO nanoparticle and MEA resulting in uncontrollable nuclei growth and impaired film conductivity 20 , hence the reason of using 1:1 stabilizer ratio. On the other hand, from the comparison of different solvents used, IPA and ethanol portray a greater transmittance percentage compared to methanol.…”

Section: Resultsmentioning

confidence: 99%

Gold-Hybridized Zinc Oxide Nanorods as Real-Time Low-Cost NanoBiosensors for Detection of virulent DNA signature of HPV-16 in Cervical Carcinoma

Thevendran

Foo

Haarindraprasad

et al. 2019

Sci Rep

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Detection of host integrated viral oncogenes are critical for early and point-of-care molecular diagnostics of virus-induced carcinoma. However, available diagnostic approaches are incapable of combining both cost-efficient medical diagnosis and high analytical performances. To circumvent this, we have developed an improved IDE-based nanobiosensor for biorecognition of HPV-16 infected cervical cancer cells through electrochemical impedance spectroscopy. The system is fabricated by coating gold (Au) doped zinc oxide (ZnO) nanorods interfaced with HPV-16 viral DNA bioreceptors on top of the Interdigitated Electrode (IDE) chips surface. Due to the concurrently improved sensitivity and biocompatibility of the designed nanohybrid film, Au decorated ZnO-Nanorod biosensors demonstrate exceptional detection of HPV-16 E6 oncogene, the cancer biomarker for HPV infected cervical cancers. This sensor displayed high levels of sensitivity by detecting as low as 1fM of viral E6 gene target. The sensor also exhibited a stable functional life span of more than 5 weeks, good reproducibility and high discriminatory properties against HPV-16. Sensor current responses are obtained from cultured cervical cancer cells which are close to clinical cancer samples. Hence, the developed sensor is an adaptable tool with high potential for clinical diagnosis especially useful for economically challenged countries/regions.

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“…It was observed that the addition of more water makes the solution translucent and disturbs the equilibrium. For (–NH 2 ), the ratio of [MEA/Zn 2+ ] = 1 is extensively used in the literature; however, several researchers have reported that in case of [MEA/Zn 2+ ] = 2, a more enhanced texture orientation toward the c-axis direction of the zincite structure [15,53,65] is obtained, as well as a finer crystallite size with less porosity [66]. This approach is also confirmed by the investigations exclusively devoted to studying the effect of the amount of amino additives on the microstructural features of ZnO thin films [67,68,69].…”

Section: Discussionmentioning

confidence: 99%

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Nateq

Ceccato

2019

Materials

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The electrical and optical properties of sol–gel derived aluminum-doped zinc oxide thin films containing 2 at.% Al were investigated considering the modifying effects of (1) increasing the sol H2O content and (2) a thermal treatment procedure with a high-temperature approach followed by an additional heat-treatment step under a reducing atmosphere. According to the results obtained via the TG-DTA analysis, FT-IR spectroscopy, X-ray diffraction technique, and four-point probe resistivity measurements, it is argued that in the modified sample, the sol hydrolysis, decomposition of the deposited gel, and crystallization of grains result in grains of larger crystallite size in the range of 20 to 30 nm and a stronger c-axis preferred orientation with slightly less microstrain. The obtained morphology and grain-boundary characteristics result in improved conductivity considering the resistivity value below 6 mΩ·cm. A detailed investigation of the samples’ optical properties, in terms of analyzing their absorption and dispersion behaviors through UV-Vis-NIR spectroscopy, support our reasoning for the increase of the mobility, and to a lesser extent the concentration of charge carriers, while causing only a slight degradation of optical transmittance down to nearly 80%. Hence, an enhanced performance as a transparent conducting film is claimed for the modified sample by comparing the figure-of-merit values.

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Effects of stabilizer ratio on photoluminescence properties of sol-gel ZnO nano-structured thin films

Cited by 38 publications

References 43 publications

One‐Pot Synthesis of Co(OH)₂‐ and/or Co₃O₄‐Decorated Cobalt‐Doped ZnO Nanorod Arrays and Their Potential as (Photo‐)Anode Materials

One‐Pot Synthesis of Co(OH)₂‐ and/or Co₃O₄‐Decorated Cobalt‐Doped ZnO Nanorod Arrays and Their Potential as (Photo‐)Anode Materials

Gold-Hybridized Zinc Oxide Nanorods as Real-Time Low-Cost NanoBiosensors for Detection of virulent DNA signature of HPV-16 in Cervical Carcinoma

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

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Effects of stabilizer ratio on photoluminescence properties of sol-gel ZnO nano-structured thin films

Cited by 38 publications

References 43 publications

One‐Pot Synthesis of Co(OH)2‐ and/or Co3O4‐Decorated Cobalt‐Doped ZnO Nanorod Arrays and Their Potential as (Photo‐)Anode Materials

One‐Pot Synthesis of Co(OH)2‐ and/or Co3O4‐Decorated Cobalt‐Doped ZnO Nanorod Arrays and Their Potential as (Photo‐)Anode Materials

Gold-Hybridized Zinc Oxide Nanorods as Real-Time Low-Cost NanoBiosensors for Detection of virulent DNA signature of HPV-16 in Cervical Carcinoma

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

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Product

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One‐Pot Synthesis of Co(OH)₂‐ and/or Co₃O₄‐Decorated Cobalt‐Doped ZnO Nanorod Arrays and Their Potential as (Photo‐)Anode Materials

One‐Pot Synthesis of Co(OH)₂‐ and/or Co₃O₄‐Decorated Cobalt‐Doped ZnO Nanorod Arrays and Their Potential as (Photo‐)Anode Materials