(100)-Textured KNN-based thick film with enhanced piezoelectric property for intravascular ultrasound imaging

Zhu, Benpeng; Zhang, Zhiqiang; Ma, Teng; Yang, Xiaofei; Li, Yongxiang; Shung, K. Kirk; Zhou, Qifa

doi:10.1063/1.4919387

Cited by 51 publications

(21 citation statements)

References 18 publications

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“…It was reported that 35 µm free‐standing (100)‐textured Li‐doped KNN thick film was prepared by employing NaNbO 3 as the template. The film exhibited higher longitudinal d 33 of 150 pm V −1 and k t of 0.44 than any other KNN thick films, and are comparable to PZT‐based films . Meanwhile, Fu et al .…”

Section: Synthetic Techniquesmentioning

confidence: 85%

“…The output energy is almost the same between KNN‐based f‐PEH and PZT‐based f‐PEH, while the eluted Pb concentration from the PZT is about three orders of magnitude higher than the Nb concentration from the KNN, as shown in Figure a, and the Pb levels in those fluids are not acceptable. Zhou's group from the Department of Biomedical Engineering of University of Southern California, has developed a KNN‐film‐based high‐frequency transducer and has applied it to intravascular ultrasound (IVUS) imaging that plays a crucial role in diagnosing coronary artery disease . Figure d is the photo of the needle IVUS transducer and Figure e compared the IVUS imaging result of KNN‐based transducer and PMN‐PT transducer.…”

Section: Application Of Knn Filmsmentioning

confidence: 99%

“…e) IVUS imaging of healthy rabbit aorta from 52 MHz (K 0.504 ,Na 0.496 ) 0.933 Li 0.067 NbO 3 thick film transducer and 40 MHz PMN‐PT single crystal transducer. Reproduced with permission . Copyright 2015, AIP Publishing LLC.…”

Section: Application Of Knn Filmsmentioning

confidence: 99%

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Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

et al. 2019

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Extensive research and great progress of (K,Na)NbO 3 (KNN)-based lead-free piezoelectric films have been driven by the current legislation and the requirement for sustainable development of society and environment in the applications of microelectromechanical systems. A comprehensive discussion of the recent achievement in KNN-based films is presented herein. First, the available synthetic techniques, chemical modification, the ferroelectric and piezoelectric properties of KNN-based films are reviewed, followed by an introduction of the crystal structures and electrical properties of KNN-based epitaxial films in comparison with the bulk ceramics. Finally, the applications of KNN-based films for the sensors, the energy harvesters, and energy storage devices are addressed, and current challenges and prospects for future work are discussed.

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Section: Synthetic Techniquesmentioning

confidence: 85%

Section: Application Of Knn Filmsmentioning

confidence: 99%

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Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

et al. 2019

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“…Lee et al [36] found that the salt contributed to the conversion reaction from plate-like precursor to KNN or NaNbO 3 platelets. Zhu et al [37] fabricated Li-doped KNN thick film by employing NaNbO 3 as template. Compared to NaNbO 3 two-dimensional (2D) templates, KNN plate-like crystals are expected to possess high piezoelectric properties, and might be much similar to the ceramic matrix [35,36].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of two-dimensional lead-free (K, Na)NbO3 micro/nano piezoelectric structures

et al. 2020

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Two-dimensional (2D) lead-free (K, Na)NbO 3 (KNN) micro/nano structures with controllable K/Na ratio were successfully fabricated via a two-step molten salt synthesis (MSS). In this work, the reaction factors, including the proportion of molten salts, the types of carbonates, the sintering temperature, and the sintering time, were discussed in detail and the optimized condition was identified. The microstructure of KNN was confirmed by confocal Raman spectroscopy, while piezoresponse force microscopy (PFM) was applied to measure three-dimensional (3D) morphology and piezoelectric properties of KNN particles. The as-synthesized KNN platelets apparently possess anisotropic morphology and uniform structure, the size of which reaches 5-20 µm in length/width and 0.5-1 µm in thickness. It should be noted that the K/Na ratios of the KNN crystals are basically consistent while the proportion of salts changes within a certain range. The enrichment of Na element in the products is also observed, which owes to the smaller ionic radius of Na + comparing to that of K +. This result provides a reference for the further preparation of textured ceramics and flexible piezoelectric generators.

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“…For example, although computed tomography (CT) possesses the ability to detect calcium in plaque3, its detection is of limited physiological significance and vulnerable to plaque type. Similarly, although an intravascular ultrasound (IVUS), which is a catheter-based intravascular imaging technique with good penetration depth and axial resolution, has been demonstrated to provide structural information of atherosclerotic plaque456, the contrast between the lipid-rich region and other soft tissue is confined789. To address this issue, intravascular photoacoustic (IVPA) imaging seems to be an alternative method to detect lipid pool and atherosclerotic calcification.…”

mentioning

confidence: 99%

New Potassium Sodium Niobate Single Crystal with Thickness-independent High-performance for Photoacoustic Angiography of Atherosclerotic Lesion

Zhu

Yang

et al. 2016

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The synthesis of (K0.45Na0.55)0.96Li0.04NbO3 (KNLN) single crystals with a <100>-orientation, using a seed-free solid state crystal growth method, is described here. With the thickness of the crystals decreasing down to the order of tens of micrometers, this new lead-free single crystal exhibits thickness-independent electrical behavior, and maintains superior piezoelectric constant (d33 = 670 pC N−1) and electromechanical coupling factor (kt = 0.55). The successful fabrication of a tiny intravascular photoacoustic probe, with a 1 mm outside diameter, is achieved using a single crystal with a thickness of around 60 μm, in combination with a 200 μm core multimode fiber. Wire phantom photoacoustic images show that the axial resolution and lateral resolution of the single crystal based probe are 60 and 220 μm, respectively. In addition, intravascular photoacoustic imaging of the atherosclerotic lesion of a human artery is presented. In the time-domain and frequency-domain images, calcified regions are clearly distinguishable from surrounding tissue. These interesting results demonstrate that KNN-based lead-free piezoelectric single crystals are a promising candidate to substitute for lead-based piezoelectric materials for photoacoustic imaging in the future.

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(100)-Textured KNN-based thick film with enhanced piezoelectric property for intravascular ultrasound imaging

Cited by 51 publications

References 18 publications

Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

Synthesis and characterization of two-dimensional lead-free (K, Na)NbO3 micro/nano piezoelectric structures

New Potassium Sodium Niobate Single Crystal with Thickness-independent High-performance for Photoacoustic Angiography of Atherosclerotic Lesion

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