Sodium doping in brookite TiO₂ enhances its photocatalytic activity

• Boxiang Zhuang,
• Honglong Shi,
• Honglei Zhang and
• Zeqian Zhang

Beilstein J. Nanotechnol. 2022, 13, 599–609, doi:10.3762/bjnano.13.52

• twins are commonly observed in BaTiO3 [31] and CaTiO3 [32]. Conclusion A sodium-doped brookite NaxTi1−xO2 was synthesized in NaOH solution. It exhibits an excellent photocatalytic activity, three times higher than that of the quasi-spherical brookite TiO2. Results of X-ray diffraction indicate that

A chemiresistive sensor array based on polyaniline nanocomposites and machine learning classification

• Jiri Kroutil,
• Alexandr Laposa,
• Ali Ahmad,
• Jan Voves,
• Vojtech Povolny,
• Ladislav Klimsa,
• Marina Davydova and
• Miroslav Husak

Beilstein J. Nanotechnol. 2022, 13, 411–423, doi:10.3762/bjnano.13.34

• (nanopowder), PANI/WO3 (nanotubes), PANI/In2O3, PANI/C60 (fullerene), PANI/nanocrystalline diamond (NCD), and PANI/BaTiO3, deposited on a flexible sensor array platform with a new design. Seven different nanocomposite sensing layers deposited on the array were exposed to six different gases (ammonia, carbon

• FERA3 GM), as shown in Figure 1a–h. All nanocomposite active layers, that is, PANI/ZnO, PANI/WO3 (nanopowder), PANI/WO3 (nanowires), PANI/In2O3, PANI/C60, PANI/NCD, and PANI/BaTiO3 have similar morphological features with a uniform distribution of additives in polyaniline. We can observe small ZnO

• /NCD, and PANI/BaTiO3) sensing layers were fabricated similarly as reported in [10]. The whole fabrication process of the sensor array is described in Figure 13. First, the protonated emeraldine salt form of PANI was prepared by oxidation of 0.2 M aniline hydrochloride with 0.25 M ammonium persulfate

Paper-based triboelectric nanogenerators and their applications: a review

• Jing Han,
• Nuo Xu,
• Yuchen Liang,
• Mei Ding,
• Junyi Zhai,
• Qijun Sun and
• Zhong Lin Wang

Beilstein J. Nanotechnol. 2021, 12, 151–171, doi:10.3762/bjnano.12.12

• schematic illustration of a TENG electrochemical system (including a TENG, a rectifier and a capacitor), which was used to improve the capacitance of the CNT electrode by PANI electropolymerization [162]. The TENG powering component was comprised of a cellulose/BaTiO3 aerogel paper as the positive friction

High permittivity, breakdown strength, and energy storage density of polythiophene-encapsulated BaTiO₃ nanoparticles

• Adnanullah Khan,
• Amir Habib and
• Adeel Afzal

Beilstein J. Nanotechnol. 2020, 11, 1190–1197, doi:10.3762/bjnano.11.103

• . This article presents the synthesis of polythiophene-encapsulated BaTiO3 (BTO-PTh) nanoparticles via an in situ Cu(II)-catalyzed chemical oxidative polymerization of thiophene monomer on hydrothermally obtained tetragonal BTO nanocrystals. The formed core–shell-type BTO-PTh nanoparticles exhibit

• increase in the energy storage density of the BTO-PTh nanoparticles is attributed to simultaneously high permittivity and breakdown strength, which are excellent for potential energy storage applications. Keywords: barium titanate (BaTiO3) nanoparticles; breakdown strength; dielectric materials; energy

• storage; polythiophene; Introduction The fast-paced progress and constantly growing demand of microelectronic devices and energy storage technologies have led to extensive research on the development of new dielectric materials [1][2][3]. High-κ ceramic-based dielectric materials such as BaTiO3 (BTO

Observation of unexpected uniaxial magnetic anisotropy in La_2/3Sr_1/3MnO₃ films by a BaTiO₃ overlayer in an artificial multiferroic bilayer

• John E. Ordóñez,
• Lorena Marín,
• Luis A. Rodríguez,
• Pedro A. Algarabel,
• José A. Pardo,
• Roger Guzmán,
• Luis Morellón,
• César Magén,
• Etienne Snoeck,
• María E. Gómez and
• Manuel R. Ibarra

Beilstein J. Nanotechnol. 2020, 11, 651–661, doi:10.3762/bjnano.11.51

• , Universidad de Zaragoza, 50018 Zaragoza, Spain 10.3762/bjnano.11.51 Abstract We studied in detail the in-plane magnetic properties of heterostructures based on a ferroelectric BaTiO3 overlayer deposited on a ferromagnetic La2/3Sr1/3MnO3 film grown epitaxially on pseudocubic (001)-oriented SrTiO3, (LaAlO3)0.3

• (Sr2TaAlO6)0.7 and LaAlO3 substrates. In this configuration, the combination of both functional perovskites constitutes an artificial multiferroic system with potential applications in spintronic devices based on the magnetoelectric effect. La2/3Sr1/3MnO3 single layers and BaTiO3/La2/3Sr1/3MnO3 bilayers

• results indicate that the BaTiO3 layer induces an additional strain in the La2/3Sr1/3MnO3 layers close to their common interface. The presence of BaTiO3 on the surface of tensile-strained La2/3Sr1/3MnO3 films transforms the in-plane biaxial magnetic anisotropy present in the single layer into an in-plane

Kelvin probe force microscopy work function characterization of transition metal oxide crystals under ongoing reduction and oxidation

• Dominik Wrana,
• Karol Cieślik,
• Wojciech Belza,
• Christian Rodenbücher,
• Krzysztof Szot and
• Franciszek Krok

Beilstein J. Nanotechnol. 2019, 10, 1596–1607, doi:10.3762/bjnano.10.155

• [26]. This general process has also been observed for the broader class of transition metal oxides, such as CaTiO3 or BaTiO3. The titanium monoxide surface layer crystallizes in the form of nanowires oriented along the main crystallographic directions of SrTiO3(100), with a length of up to 10 µm, a

Tailoring the magnetic properties of cobalt ferrite nanoparticles using the polyol process

• Malek Bibani,
• Romain Breitwieser,
• Alex Aubert,
• Vincent Loyau,
• Silvana Mercone,
• Souad Ammar and
• Fayna Mammeri

Beilstein J. Nanotechnol. 2019, 10, 1166–1176, doi:10.3762/bjnano.10.116

• knowledge, the best improvements made in this sense were those achieved by Zheng et al., who succeeded in designing self-assembled ferromagnetic CoFe2O4 nanopillars embedded in a ferroelectric BaTiO3 matrix [6], and by Acevedo et al. and Liu et al., who prepared CoFe2O4 and BaTiO3 nanoparticles (NPs

One-step nonhydrolytic sol–gel synthesis of mesoporous TiO₂ phosphonate hybrid materials

• Yanhui Wang,
• P. Hubert Mutin and
• Johan G. Alauzun

Beilstein J. Nanotechnol. 2019, 10, 356–362, doi:10.3762/bjnano.10.35

• with 1,3,5-trihydroxybenzene [32]. The reaction of alkoxides in acetophenone (used as a solvent and an oxygen donor) has already been described for the synthesis of TiO2 [33] and BaTiO3 [34] nanoparticles, but it has never been used to prepare mesoporous oxides or hybrid materials. In the present work

Pinning of a ferroelectric Bloch wall at a paraelectric layer

• Vilgelmina Stepkova and
• Jiří Hlinka

Beilstein J. Nanotechnol. 2018, 9, 2356–2360, doi:10.3762/bjnano.9.220

• Vilgelmina Stepkova Jiri Hlinka Institute of Physics, The Czech Academy of Sciences, 182 21 Prague, Czech Republic 10.3762/bjnano.9.220 Abstract The phase-field simulations of ferroelectric Bloch domain walls in BaTiO3–SrTiO3 crystalline superlattices performed in this study suggest that a

• ferroelectric Bloch wall passing through it. Thus, ferroelectric Bloch domain walls are shown to be ideal nanoscale objects with switchable properties. The reported results hint towards the possibility to exploit ferroelectric domain wall interaction with simple nanoscale devices. Keywords: BaTiO3–SrTiO3

• phenomena as the parent ferroelectric materials. For example, in the case of BaTiO3–SrTiO3 superlattices with only a few atomic layers of SrTiO3, the domain walls are simply expected to penetrate through BaTiO3/SrTiO3 interfaces [1][2][3][4][5]. In general, it can be expected that a small amount of

Effect of ferroelectric BaTiO₃ particles on the threshold voltage of a smectic A liquid crystal

• Abbas R. Imamaliyev,
• Mahammadali A. Ramazanov and
• Shirkhan A. Humbatov

Beilstein J. Nanotechnol. 2018, 9, 824–828, doi:10.3762/bjnano.9.76

• ferroelectric BaTiO3 particles on the planar–homeotropic transition threshold voltage in smectic A liquid crystals consisting of p-nitrophenyl p-decyloxybenzoate and 4-cyano-4′-pentylbiphenyl were studied by using capacitance–voltage (C–V) measurements. It was shown that the BaTiO3 particles significantly

• reduce the threshold voltage. The obtained result is explained by two factors: an increase of dielectric anisotropy of the liquid crystals and the formation of a strong electric field near polarized particles of BaTiO3. It was shown that the role of the second factor is dominant. The explanations of some

• features observed in the C–V characteristics are given. Keywords: colloidal systems; dielectric permittivity; ferroelectric BaTiO3 particles; smectic A liquid crystals; threshold voltage; Introduction Interest in liquid crystals (LC) as a unique state of matter arises not only from a scientific point of

Perovskite-structured CaTiO₃ coupled with g-C₃N₄ as a heterojunction photocatalyst for organic pollutant degradation

• Ashish Kumar,
• Christian Schuerings,
• Suneel Kumar,
• Ajay Kumar and
• Venkata Krishnan

Beilstein J. Nanotechnol. 2018, 9, 671–685, doi:10.3762/bjnano.9.62

• in the literature [32][33]. Xian and coworkers have studied the photocatalytic degradation of MO under simulated solar light irradiation in BaTiO3–g-C3N4 composites with an efficient charge separation of photogenerated charge carriers at the interfaces [30]. Leong et al. have successfully made a