Ultra-efficient thermo-convective solution-growth of vertically aligned ZnO nanowires

Chakraborty, Abhisek; Orsini, Andrea; Kar, Jyoti Prakash; Gatta, F.; Khan, Usman; Falconi, Christian

doi:10.1016/j.nanoen.2022.107167

Cited by 9 publications

(4 citation statements)

References 46 publications

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“…The extracted parameters (fits B and C of the previous list) are reported in Figure 7 a (conductance) and Figure 7 b (FP exponential coefficient) as a function of the 23 temperatures of measurement. Such results show that conductance increases exponentially with temperature as it is expected for thermal activation of charges trapped in shallow defects [ 40 ] and that the first exponential regime is characterized by a lower conductance value. In Figure 7 b, it is instead evident that the exponential coefficient is slightly higher in first low-voltage range.…”

Section: Resultsmentioning

confidence: 65%

Frenkel-Poole Mechanism Unveils Black Diamond as Quasi-Epsilon-Near-Zero Surface

et al. 2023

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A recent innovation in diamond technology has been the development of the “black diamond” (BD), a material with very high optical absorption generated by processing the diamond surface with a femtosecond laser. In this work, we investigate the optical behavior of the BD samples to prove a near to zero dielectric permittivity in the high electric field condition, where the Frenkel-Poole (FP) effect takes place. Zero-epsilon materials (ENZ), which represent a singularity in optical materials, are expected to lead to remarkable developments in the fields of integrated photonic devices and optical interconnections. Such a result opens the route to the development of BD-based, novel, functional photonic devices.

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Section: Resultsmentioning

confidence: 65%

Frenkel-Poole Mechanism Unveils Black Diamond as Quasi-Epsilon-Near-Zero Surface

et al. 2023

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“…The solution growth of ZnO nanowires usually requires the pre-deposition of a seed layer on the substrate. However, there are methods such as, for instance, the spin-and-spray approach or ultra-efficient thermo-convective solution-growth, for directly growing ZnO nanowires without the issues associated to the seed layer deposition and, in several cases, the subsequent annealing. Similarly, as shown in Figure , recently, it has been found , that the creation of the galvanic effect can promote the ZnO nucleation and, therefore, the growth of very dense arrays of nanowires on the metal that is not galvanically active (i.e., noble metals).…”

Section: Resultsmentioning

confidence: 99%

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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“…While anodic oxidation techniques, electron beam lithography, nano-imprint lithography, hydro/solvothermal synthesis, template-assisted, electrochemical deposition, and physical vapor deposition are commonly utilized to prepare NWs [126]. This section focuses on the 1D nanomaterials used for fabricating flexible sensors, such as CNTs [127], metal and metal oxide NWs (gold [128], silver [129], copper [130], zinc oxide [131]) (table 3).…”

Section: D Nanomaterialsmentioning

confidence: 99%

“…are typically used to prepare flexible self-powered pressure sensors [172]. Chakraborty et al demonstrated the ultraefficient, convection-assisted, seed-free synthesis of highdensity, vertically aligned ZnO NWs over large areas by heating substrates with adjacent temperature-controlled surfaces [131]. Yin et al developed a transparent, super-sensitive, and flexible humidity sensor using a mixture of ZnO NWs and graphene as a composite sensing layer.…”

Section: Ferromagnetic Thin Filmsmentioning

confidence: 99%

Nanomaterial-based flexible sensors for metaverse and virtual reality applications

Wang

Suo

Song

et al. 2023

Int. J. Extrem. Manuf.

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Nanomaterial-based flexible sensors (NMFSs) can be tightly attached to the human skin or integrated with clothing to monitor human physiological information, provide medical data, or explore metaverse spaces. Owing to their facile processing, material compatibility, and unique properties, nanomaterials have been widely incorporated into flexible sensors. This review highlights the recent advancements in NMFSs involving various nanomaterial frameworks such as nanoparticles, nanowires, and nanofilms. Different triggering interaction interfaces between NMFSs and metaverse/virtual reality (VR) applications, e.g., skin-mechanics-triggered, temperature-triggered, magnetically triggered, and neural-triggered interfaces, are discussed. In the context of interfacing physical and virtual worlds, machine learning (ML) has emerged as a promising tool for processing sensor data for controlling avatars in metaverse/VR worlds, and many ML algorithms have been proposed for virtual interaction technologies. The advantages, disadvantages, and prospects of NMFSs in metaverse/VR applications are discussed.

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Ultra-efficient thermo-convective solution-growth of vertically aligned ZnO nanowires

Cited by 9 publications

References 46 publications

Frenkel-Poole Mechanism Unveils Black Diamond as Quasi-Epsilon-Near-Zero Surface

Frenkel-Poole Mechanism Unveils Black Diamond as Quasi-Epsilon-Near-Zero Surface

ZnO Nanowires for Feedback-Assisted Tuning of Electromechanical Resonators

Nanomaterial-based flexible sensors for metaverse and virtual reality applications

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