Piezo‐Semiconductive Quasi‐1D Nanodevices with or without Anti‐Symmetry

Araneo, Rodolfo; Lovat, Giampiero; Burghignoli, Paolo; Falconi, Christian

doi:10.1002/adma.201104588

Cited by 129 publications

(122 citation statements)

References 19 publications

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“…With reference to nanostructures, we focused on the synthesis of arrays of ZnO nanorods because of their wide applications including nanogenerators23242526, laser2728, piezotronics2930, piezo-photo-tronics303132 and sensors with superior performances203334. As an illustrative example, we have considered an extremely simple, single-step, double-sided method for growing high-density, well-separated, vertically aligned ZnO nanorods on quartz resonators by means of the most typical nutrient solution20, i.e.…”

Section: Resultsmentioning

confidence: 99%

Real-time monitoring of the solution growth of ZnO nanorods arrays by quartz microbalances and in-situ temperature sensors

Orsini

Falconi

2014

Sci Rep

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Wet-chemistry methods have crucial advantages for the synthesis of nanostructures, including simple, low-cost, large-area, and low-temperature deposition on almost arbitrary substrates. Nevertheless, the rational design of improved wet-chemistry procedures is extremely difficult because, in practice, only post-synthesis characterization is possible. In fact, the only methods for on-line monitoring the growth of nanostructures in liquids are complex, expensive and introduce intricate artifacts. Here we demonstrate that electro-mechanically resonating substrates and in-situ temperature sensors easily enable an accurate real-time investigation of reaction kinetics and, in combination with conventional SEM imaging, greatly facilitate the rational design of optimized synthesis procedures; in particular, such a simple approach provides useful insight for the development of processes where one or more key parameters are dynamically adjusted. As a proof-of-concept, first, we accurately characterize a process for fabricating arrays of ZnO nanorods; afterwards, we design a dynamic-temperature process that, in comparison with the corresponding constant-temperature procedure, is almost-ideally energy efficient and results in ZnO nanorods with improved characteristics in terms of length, aspect ratio, and total deposited nanorods mass. This is a major step towards the rational design of dynamic procedures for the solution growth of nanostructures.

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Section: Resultsmentioning

confidence: 99%

Real-time monitoring of the solution growth of ZnO nanorods arrays by quartz microbalances and in-situ temperature sensors

Orsini

Falconi

2014

Sci Rep

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“…figure 7 (d). The mechanism of piezoelectricity generation from ZnO NNs is similar to the conical or cylindrical like nanostructures as define in published work [29]. As the diameter of top and bottom of NNs were different therefore free charge carriers and piezoelectric potential will vary due to the difference of strain / stress at bottom and top.…”

Section: Methodsmentioning

confidence: 79%

“…Since the tip of NN will stretch more due to the inhomogeneous diameter, therefore the thin top will show better mechanical stability as compared to bottom. The amount of generated charges at the top will be more in magnitude as compared to bottom [29]. …”

Section: Methodsmentioning

confidence: 99%

Fabrication of zinc oxide nanoneedles on conductive textile for harvesting piezoelectric potential

Khan

Hussain

Nur

et al. 2014

Chemical Physics Letters

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Keeping the fact in mind that different morphologies have strong influence on piezoelectric properties, ZnO NNs were synthesized on textile for harvesting piezoelectricity. Piezoelectric potential was captured from ZnO NNs grown on textile by using AFM in contact mode.Structural study was carried out by using FESEM, HRTEM and XRD techniques. The recorded output potential and current was more than 45 mV and 150 nA. The combination of ZnO NNs and textile can be used effectively for energy harvesting applications and the use of textile fabric can pave the way for cheap, flexible, wearable, washable and environment friendly nanodevices.

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“…(2.17)) is based on Lippmann theory, since we assume that there are no free charge carriers and the whole system is isolated. However, according to recent studies, the piezoelectric potential in a strained GaN nanostructure would be screened by the free charge carriers, since the as-grown GaN nanostructure always shows an n-type semiconducting behavior (Gao and Wang 2009;Romano et al 2011;Araneo et al 2012). In order to overcome this screening effect, the idea of controlling the screening effect by imposing external surface charges on the nanowire/nanotube system has recently been invalidated theoretically and experimentally (Kim et al 2012;Sohn et al 2013).…”

Section: Piezoelectric Potential In Gan Nanotubesmentioning

confidence: 96%

Piezoelectric Response at Nanoscale

Zhang

Meguid

2016

Advances in Nanocomposites

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Considerable efforts were invested to study the piezoelectricity at the nanoscale, which serves as a physical basis for a wide range of smart nanodevices and nanoelectronics. This chapter reviews the recent progress in characterizing the effective piezoelectric property in a nanoworld and the influence of the piezoelectric effect on the mechanical responses of nanoscale structures. Extremely strong piezoelectric responses of piezoelectric nanomaterials were reported in experiments, and the size dependence was observed in atomistic simulations. Attempts were also made to reveal the physics behind these unique features, but the universal theory has not yet been established. Among the proposed mechanisms, the theory of surface piezoelectricity is widely accepted and thus used to derive two effective piezoelectric coefficients (EPCs) for investigating the effect of piezoelectricity on (1) stress or strain and (2) the effective elastic moduli of piezoelectric nanomaterials. The EPCs are found to be size-dependent and also deformationselective. The obtained results also show that at the nanoscale the surface piezoelectricity can enhance the piezoelectric potential of nanostructures when subjected to a static deformation. In addition, the intrinsic loss of oscillating piezoelectric nanostructures can be mitigated through the piezoelectric effect at the nanoscale.

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Piezo‐Semiconductive Quasi‐1D Nanodevices with or without Anti‐Symmetry

Cited by 129 publications

References 19 publications

Real-time monitoring of the solution growth of ZnO nanorods arrays by quartz microbalances and in-situ temperature sensors

Real-time monitoring of the solution growth of ZnO nanorods arrays by quartz microbalances and in-situ temperature sensors

Fabrication of zinc oxide nanoneedles on conductive textile for harvesting piezoelectric potential

Piezoelectric Response at Nanoscale

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