Piezoelectric properties of sol-gel derived ZnO thin films

Bukowski, T. J.; McCarthy, K. C.; McCarthy, F. S.; Teowee, G.; Alexander, T. P.; Uhlmann, D. R.; Dawley, Jeff; Zelinski, Brian J.J.

doi:10.1080/10584589708013008

Cited by 21 publications

(12 citation statements)

References 23 publications

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“…This has been overcome in nanocrystalline thin films of hydroxyapatite deposited on Si. In 2011, Lang et al reported the first measurements of a piezoelectric coefficient in hydroxyapatite thin films (16 pC N −1 ) and a pyroelectric coefficient (12 μC m −2 K −1 )20, which are similar to the values for PVDF21 and ZnO22 thin films.…”

mentioning

confidence: 68%

Ferroelectric Polarization in Nanocrystalline Hydroxyapatite Thin Films on Silicon

Lang

Tofail

Kholkin

et al. 2013

Sci Rep

122

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Hydroxyapatite nanocrystals in natural form are a major component of bone- a known piezoelectric material. Synthetic hydroxyapatite is widely used in bone grafts and prosthetic pyroelectric coatings as it binds strongly with natural bone. Nanocrystalline synthetic hydroxyapatite films have recently been found to exhibit strong piezoelectricity and pyroelectricity. While a spontaneous polarization in hydroxyapatite has been predicted since 2005, the reversibility of this polarization (i.e. ferroelectricity) requires experimental evidence. Here we use piezoresponse force microscopy to demonstrate that nanocrystalline hydroxyapatite indeed exhibits ferroelectricity: a reversal of polarization under an electrical field. This finding will strengthen investigations on the role of electrical polarization in biomineralization and bone-density related diseases. As hydroxyapatite is one of the most common biocompatible materials, our findings will also stimulate systematic exploration of lead and rare-metal free ferroelectric devices for potential applications in areas as diverse as in vivo and ex vivo energy harvesting, biosensing and electronics.

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mentioning

confidence: 68%

Ferroelectric Polarization in Nanocrystalline Hydroxyapatite Thin Films on Silicon

Lang

Tofail

Kholkin

et al. 2013

Sci Rep

122

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“…By producing dielectric polarization with a mechanical strain and, conversely, a mechanical response with an applied electric eld, they have found applications in sensors, 1 energy harvesting, 2,3 actuators, 4 oscillators, 5,6 and many other elds. Most recent studies have focused on inorganic piezoelectric materials, such as AlN, 7 ZnO, 8 LiNbO 3 , 9 and lead zirconate titanate (PZT). 10 These inorganic piezoelectric ceramics have large piezoelectric coefficients, but are generally stiff and brittle, and some even contain environmentally unfriendly elements, including the champion piezoelectric PZT.…”

Section: Introductionmentioning

confidence: 99%

First-principles analysis of a molecular piezoelectric meta-nitroaniline

Wang

Dai

et al. 2018

RSC Adv.

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The piezoelectric and elastic properties of a molecular piezoelectric meta-nitroaniline (mNA) in its singlecrystal form were investigated in the framework of first-principles density functional perturbation theory (DFPT). Results support the recent experimental findings those despite being soft and flexible, mNA's piezoelectric coefficients are an order of magnitude greater than that of ZnO and LiNbO 3 . A molecularlevel insight into the piezoelectric properties of mNA is provided. These results are helpful not only for better understanding mNA, but also for developing new piezoelectric materials.

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“…It appears to be the sole property of the inherently disordered, nonstoichiometric P6 3/m HAp and not of its pure, monoclinic, P2 1/b counterpart 61 . The order of magnitude of the piezoelectric response of HAp, with the piezoelectric coefficient, D = 16 pC/N 62 , is lower than that exhibited by lead zirconate titanate (PZT), but higher than that of aluminum nitride and in about the same range as that of polyvinylidene fluoride and zinc oxide 63,64 . In addition, HAp thin films exhibit the ferroelectric nature of polarization, with remnant polarization being approximately one-fourth of the value of PZT films 65 .…”

Section: Peculiarities Of Hapmentioning

confidence: 93%

“…61 The order of magnitude of the piezoelectric response of HAp, with the piezoelectric coefficient D ¼ 16 pC N À1 , 62 is lower than that exhibited by lead zirconate titanate (PZT), but higher than that of aluminum nitride and in about the same range as those of polyvinylidene uoride and zinc oxide. 63,64 In addition, HAp thin lms exhibit the ferroelectric nature of polarization, with the remnant polarization being approximately one-fourth of the value of PZT lms. 65 Although nanocrystalline HAp is predominantly polar, its polycrystalline nature in bone and mostly elsewhere is the reason why this piezoelectric effect becomes averaged over three dimensions, resulting in minor values along its favored direction, perpendicular to the basal plane and parallel to the OH À channel.…”

Section: Finite Piezoelectricity Pyroelectricity and Conductivity To ...mentioning

confidence: 99%

The role of hydroxyl channel in defining selected physicochemical peculiarities exhibited by hydroxyapatite

Uskoković

2015

RSC Adv.

122

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Mysteries surrounding the most important mineral for the vertebrate biology, hydroxyapatite, are many. Perhaps the Greek root of its name, απαταo, meaning ‘to deceive’ and given to its mineral form by the early gem collectors who confused it with more precious stones, is still applicable today, though in a different connotation, descriptive of a number of physicochemical peculiarities exhibited by it. Comparable to water as the epitome of peculiarities in the realm of liquids, hydroxyapatite can serve as a paradigm for peculiarities in the world of solids. Ten of the peculiar properties of hydroxyapatite are sketched in this review piece, ranging from (i) the crystal lattice flexibility to (ii) notorious surface layer instability to (iii) finite piezoelectricity, pyroelectricity and conductivity to protons to (iv) accelerated growth and improved osteoconductivity in the electromagnetic fields to (v) high nucleation rate at low supersaturations and low crystal growth rate at high supersaturations to (vi) higher bioactivity and resorbability of biological apatite compared to the synthetic ones, and beyond. An attempt has been made to explain this array of curious characteristics by referring to a particular element of the crystal structure of hydroxyapatite: the hydroxyl ion channel extending in the direction of the c-axis, through a crystallographic column created by the overlapping calcium ion triangles.

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Piezoelectric properties of sol-gel derived ZnO thin films

Cited by 21 publications

References 23 publications

Ferroelectric Polarization in Nanocrystalline Hydroxyapatite Thin Films on Silicon

Ferroelectric Polarization in Nanocrystalline Hydroxyapatite Thin Films on Silicon

First-principles analysis of a molecular piezoelectric meta-nitroaniline

The role of hydroxyl channel in defining selected physicochemical peculiarities exhibited by hydroxyapatite

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