Epitaxial growth and cationic exchange properties of layered KNb₃O₈thin films

Abstract

The KNb 3 O 8 potassium triniobate phase is a layered compound that shows excellent photocatalytic activity, intercalation properties and electrochemical performances. In this study, we report the synthesis of this niobate in thin film form. Thin films of layered KNb 3 O 8 phase were grown by pulsed laser deposition on (100)-oriented strontium titanate SrTiO 3 substrates using targets with different compositions and various deposition parameters. Samples were analyzed by X-ray diffraction, scanning and transmission electron microscopy, X-ray energy dispersive and Rutherford backscattering spectroscopies. This work shows that

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

“…Since data have not been yet reported on the TTB phase in the KNN system, the knowledge about the KN system [31] chemically close to the KNN one, has been therefore considered. With the aim to obtain a thin film composition close to (K x Na 1-x ) 6 Nb 10 O 30 and while taking into account the alkaline elements volatility during the PLD process [31,32], the K 0.5 Na 0. A second film, namely F2, was grown on the Nb:(110)SrTiO 3 from the same target at higher temperature.…”

“…Indeed, if the method is known to be congruent in the absence of volatile cation, it offers also a great possibility to tune the composition of the films, either by the modification of the target one and/or by the modification of the deposition parameters. Therefore because of the high alkaline (especially potassium) volatility, a thorough investigation of the deposition parameters is requested to grow the pure phase [31].…”

Lithium Storage in Carbon Cloth–Supported KNb3O8 Nanorods Toward a High‐Performance Lithium‐Ion Capacitor

“…In addition, the Raman spectrum of CC‐KNb 3 O 8 ‐2.8, as shown in Figure S1d, Supporting Information, displays prominent peaks characteristic of KNb 3 O 8 . [ 24,28,29 ] To detect the chemical composition and element valence states, XPS of CC‐KNb 3 O 8 ‐2.8 was performed. The O, C, Nb, and K elements appear in the full XPS spectrum (Figure 2c).…”

Effect of carbon quantum dots on the photo‐absorption, photo‐response and photoelectrochemical performance of KNb 3 O 8 film photoelectrode

“…Therefore, it is highly desirable to modify the UV type photocatalyst for visible light response. Similar to TiO 2 photocatalyst, to solve this problem, many strategies have been developed, such as loading noble metals and non-metal elements, doping with metal and non-metal elements, sensitization with organic dyes, coupling with narrow bandgap semiconductors [10][11][12][13][14][15][16][17]. In addition to, recently, a novel class of nanocarbons, which are called carbon quantum dots (CQDs), have been attracting increasing attention due to their unique properties, such as excellent up-converting and size dependent photoluminescence, photoinduced electron transfer, superior stability against photo-bleaching, high aqueous solubility, and low cytotoxicity [18][19][20][21][22].…”