Psathas Pavlos, Zindrou Areti, Spyrou Anastasia V, Deligiannakis Yiannis
Laboratory of Physical Chemistry of Materials & Environment, Department of Physics, University of Ioannina, 45110 Ioannina, Greece.
Nanomaterials (Basel). 2024 Jul 27;14(15):1257. doi: 10.3390/nano14151257.
Lithium tantalate (LiTaO) perovskite finds wide use in pyroelectric detectors, optical waveguides and piezoelectric transducers, stemming from its good mechanical and chemical stability and optical transparency. Herein, we present a method for synthesis of LiTaO nanoparticles using a scalable Flame Spray Pyrolysis (FSP) technology, that allows the formation of LiTaO nanomaterials in a single step. Raman, XRD and TEM studies allow for comprehension of the formation mechanism of the LiTaO nanophases, with particular emphasis on the penetration of Li atoms into the Ta-oxide lattice. We show that, control of the High-Temperature Particle Residence Time (HTPRT) in the FSP flame, is the key-parameter that allows successful penetration of the -otherwise amorphous- Li phase into the TaO nanophase. In this way, via control of the HTPRT in the FSP process, we synthesized a series of nanostructured LiTaO particles of varying phase composition from {amorphous Li/TaO/LiTaO} to {pure LiTaO, 15-25 nm}. Finally, the photophysical activity of the FSP-made LiTaO was validated for photocatalytic H production from HO. These data are discussed in conjunction with the role of the phase composition of the LiTaO nanoparticles. More generally, the present work allows a better understanding of the mechanism of ABO perovskite formation that requires the incorporation of two cations, A and B, into the nanolattice.
钽酸锂（LiTaO）钙钛矿因其良好的机械和化学稳定性以及光学透明性，在热释电探测器、光波导和压电换能器中得到广泛应用。在此，我们展示了一种使用可扩展的火焰喷雾热解（FSP）技术合成LiTaO纳米颗粒的方法，该方法能够一步形成LiTaO纳米材料。拉曼光谱、X射线衍射（XRD）和透射电子显微镜（TEM）研究有助于理解LiTaO纳米相的形成机制，尤其着重于Li原子向Ta氧化物晶格的渗透。我们表明，控制FSP火焰中的高温颗粒停留时间（HTPRT）是使原本无定形的Li相成功渗透到TaO纳米相中的关键参数。通过这种方式，通过控制FSP过程中的HTPRT，我们合成了一系列具有不同相组成的纳米结构LiTaO颗粒，从{无定形Li/TaO/LiTaO}到{纯LiTaO，15 - 25纳米}。最后，通过光催化由H₂O产生H₂验证了FSP制备的LiTaO的光物理活性。结合LiTaO纳米颗粒的相组成作用对这些数据进行了讨论。更一般地说，本工作有助于更好地理解ABO钙钛矿形成机制，该机制需要将两种阳离子A和B掺入纳米晶格中。
