Study of structural and optical properties of low temperature photo-activated ZnO-rGO composite thin film

Chakraborty, Abhisek; Agresti, Antonio; Pizzoferrato, R.; F, De Matteis; Orsini, Andrea; Medaglia, P. G.

doi:10.1016/j.materresbull.2017.03.030

Cited by 15 publications

(8 citation statements)

References 70 publications

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“…The nanometer dimensions of the ZnO nanowires result in the accurate tuning of the resonant frequency, while the much larger (e.g., few millimeters) diameter of the quartz allows straightforward interfacing, simple handling, and packaging. Interestingly, ZnO is also widely employed for surface acoustic wave devices, so that our approach could be easily extended to this important class of electromechanical resonators. , Moreover, the proposed approach can obviously be extended to other methods for growing ZnO nanowires − or other quasi-1D nanostructures or composites …”

Section: Discussionmentioning

confidence: 99%

“… 51 , 52 Moreover, the proposed approach can obviously be extended to other methods for growing ZnO nanowires 53 − 55 or other quasi-1D nanostructures or composites. 56 …”

Section: Discussionmentioning

confidence: 99%

“…or other quasi-1D nanostructures or composites 56. ■ ASSOCIATED CONTENT * sı Supporting InformationThe Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsanm.2c03963.The Supporting Information is available free of charge.…”

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confidence: 99%

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ZnO Nanowires for Feedback-Assisted Tuning of Electromechanical Resonators

Orsini

Falconi

2022

ACS Appl. Nano Mater.

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The fabrication of devices with accurately controlled properties almost invariably takes advantage of feedback so that, based on real-time measurements, process parameters can be automatically adjusted in order to obtain the desired characteristics. Nevertheless, despite the outstanding advantages of wet-chemistry methods (e.g., simplicity, low-cost, low-temperature, and compatibility with almost any process and type of substrate), the use of feedback in the solution growth of nanostructures is almost unexplored. In fact, conventional techniques for the real-time in-liquid characterization of nanostructures are extremely complex and can introduce intricate artefacts. Here, by taking advantage of an electro-mechanical resonator as a substrate, we on-line monitor, at the system level, the nanostructure growth, thus enabling the feedback-assisted tuning of low-cost electro-mechanical resonators by ZnO nanowires. This approach allows for post-fabrication tuning of the resonant frequency with high accuracy and high tuning range (e.g., about 1% in our experiments) in a simple, fast, low power, and low-cost manner, without requiring expensive facilities such as clean rooms or high-vacuum deposition systems. Moreover, remarkably, we find that for a given desired resonant frequency, the quality factor of the resonance can be separately adjusted by modifying the nutrient solution, which can be a key advantage for filters. The straightforward interfacing and packaging of the final resonator stems from the large difference, about 5 orders of magnitude, between the key structure dimensions, namely, the diameter of the ZnO nanowires and the much larger (e.g., few millimeters) diameter of the quartz. Our results can lead to the widespread application of nanowire-tuned electro-mechanical oscillators and filters in electronics, sensors, and material science.

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Section: Discussionmentioning

confidence: 99%

“… 51 , 52 Moreover, the proposed approach can obviously be extended to other methods for growing ZnO nanowires 53 − 55 or other quasi-1D nanostructures or composites. 56 …”

Section: Discussionmentioning

confidence: 99%

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ZnO Nanowires for Feedback-Assisted Tuning of Electromechanical Resonators

Orsini

Falconi

2022

ACS Appl. Nano Mater.

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“…58 Bonding strength between the composite components is dependent on the amount of C-O or N-H bonding due to the variety of matrixreinforcement interactions. 95,96 The more stronger the bonds between the matrix and reinforcements, the more the wear resistance. 77 Graphite powder is schematically shown in Figure 9.…”

Section: Nano-al 2 O 3 (Ep Pu or Ep/pu Matrix)mentioning

confidence: 99%

Epoxy/polyurethane nanocomposite coatings for anti-erosion/wear applications: A review

Bahramnia

Semnani

Habibolahzadeh

et al. 2020

Journal of Composite Materials

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Offshore pipelines are vulnerable against erosion/wear deterioration mechanisms that can be controlled through the use of proper surface coatings, such as polymer matrix nano-composite (PMNC) coatings that are well-known for their ease of production, availability and applicability. Epoxy, as a versatile rigid and brittle resin and polyurethane with proper chemical/mechanical properties, are potential candidates to make the matrix of these composites. A combination of these polymers can also enhance the mechanical behaviors, glass transition temperature and flexibility. In addition, the desired coating characteristics, such as adhesion to metal substrate, mechanical properties, erosion/wear resistivity and UV absorbance, can be further improved through the addition of appropriate nanoparticles within the polymer matrix. Especially, nanoparticles can improve the erosion/wear resistance of polymers because of establishing high strength bonds between the polymer chains and the reinforcements besides enhancing other required properties. The present work is a review on PMNC coatings that contain epoxy, polyurethane or EP/polyurethane as a polymer matrix along with the details of the nanoparticle reinforcements, such as alumina, silica, titanium oxide, zinc oxide, clay and carbon-based materials. The effect of these nanoparticles on the properties of composite coatings has also been investigated.

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“…e interconnected interface of the composites is dependent on the intensity of signals such as C-O or N-H due to the changing matrix-filler interactions [12,13]. Most prominent characteristics that are affected due to reinforcement are the mechanical properties of the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Functionalized Waterborne Polyurethane-Based Graphite-Reinforced Composites

Abdullah

Rus

Abdullah

2019

Advances in Materials Science and Engineering

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The synthesis and characterization of waterborne polyurethane-based oxidized graphite- (WPUG-) reinforced composites is disclosed. The morphology-structure relations of WPUG composites are studied using field emission scanning electron microscopy (FESEM) and Fourier transform infrared (FTIR) spectroscopy. Prior to this, it is confirmed that, in the WPUG composites, the graphite particles containing functional groups such as hydroxyl and carboxylic groups are randomly distributed and attributed to the formation of interconnected interface within the polymeric composites. This promotes enhancement in modulus and tensile strength up to ∼440% and ∼100%, respectively. Significantly, these results were correlated with viscoelastic properties in which the composites show positive response to graphite addition. Further studies in optical properties consequently attribute decreasing values in optical energy band gap (Eg) which afterwards took the leads to electrical conductivity (σ). Aptly, the composites WPUG20, WPUG25, and WPUG30 were found to possess favorable electrical conductivity through the two-point probe method. This revealed the improvement in electrical properties with promising potential as alternative petroleum-based composites to generate energy from the renewable resources and also apply greener ways for energy consumption.

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Study of structural and optical properties of low temperature photo-activated ZnO-rGO composite thin film

Cited by 15 publications

References 70 publications

ZnO Nanowires for Feedback-Assisted Tuning of Electromechanical Resonators

ZnO Nanowires for Feedback-Assisted Tuning of Electromechanical Resonators

Epoxy/polyurethane nanocomposite coatings for anti-erosion/wear applications: A review

Functionalized Waterborne Polyurethane-Based Graphite-Reinforced Composites

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