0.1(Bi,Na)TiO₃–0.9BaTiO₃ thin films were deposited by pulsed laser deposition as a candidate of lead-free thin films with a positive temperature coefficient of resistance for micro-thermistor applications in microelectro mechanical system devices. (001)-oriented epitaxial tetragonal films with a unity (Bi + Na + Ba)/Ti ratio were grown at 675 °C under a total pressure of 50 mTorr. The obtained films showed improved insulating properties and clear ferroelectricity. The Curie temperature was estimated to be 200 °C by the high-temperature X-ray diffraction measurement, which was almost the same as the reported value for the ceramic.

Pulsed laser deposition (PLD) with an electromagnet (dynamic aurora PLD) and reflection high-energy electron diffraction (RHEED) was developed by installing an 11-tuned solenoid coil in a vacuum chamber. This method achieved thin film deposition under a magnetic field of up to 120 mT using dc current of 1,200 A. The electromagnet is a solenoid coil, which produces a magnetic field that is proportional to an electric field without saturation of the magnetic field. This PLD method enables in situ observation of the crystal structure of the thin film surface after turning the electromagnet off, but without breaking vacuum. Many reports have described studies of PLD in a magnetic field. For most such studies, permanent magnets have been used to apply a magnetic field to the plume. Nevertheless, when doing so, carrying out in-situ observation using RHEED is difficult because the magnetic field deflects the electron beam. This case study examined effects of magnetic field application to the plume on the in-plane orientation and resistivity of a NiO thin film deposited on a MgO(001) single crystal at room temperature (25 °C). Results demonstrate that the in-plane orientation (epitaxial growth) is unchanged, whereas thin film resistivity decreases exponentially with the magnetic field intensity during deposition. These results suggest that the Ni³⁺ ion concentration can be expected to increase exponentially with the magnetic field during deposition. The room-temperature resistivity of the NiO thin film deposited under a 120 mT magnetic field was 112 Ω cm.

NiCo₂O₄ is promising as one of the p-type oxide semiconductors for practical applications in optoelectronic devices. In this study, we have elaborated NiCo₂O₄ hexagonal nanoplatelet films and examined their photovoltaic properties. The film fabrication was actually achieved by four steps: the synthesis of hexagonal nanoplatelets of a Ni_1/3Co_2/3(OH)₂ precursor, the dispersion of the nanoplatelets in liquid media, the self-assembly of the nanoplatelets on dipped substrates, and the topological conversion of the hydroxide to the oxide by the heat treatment. The resultant NiCo₂O₄ thin films had structural features such as the crystallographic (111) orientation, the high specific surface area, and the high light-scattering ability. As a result, the NiCo₂O₄ thin films loaded with an N749 dye could work effectively as photocathodes in the configuration of dye-sensitized solar cells.

We developed a thin-film nitride thermistor on a resin substrate with high heat resistance by focusing on the interface between the polyimide (PI) substrate and (Al,Ti)N film. Heat resistance properties of nitride thermistors are degraded by an amorphous oxynitride layer on the PI substrate that forms during the initial stage of sputtering. We propose the introduction of an inorganic insulating underlayer at the interface between (Al,Ti)N and the PI substrate to prevent the formation of the amorphous phase. As a result, highly crystalline (Al,Ti)N was grown directly on an inorganic insulating underlayer and high heat resistance was achieved.

Single droplet assembly is a new thin-film technology using drop casting of two-dimensional (2D) materials: controlled convection by a pipette and a hotplate causes a uniform deposition, suggesting new possibility of 2D nanosheet assembly. We extended this new assembly technique to titania nanocoating by including detailed investigations on fabrication procedure and characteristics as coating applications. The layer-by-layer approach using single droplet assembly is effective for the fabrication of atomically uniform and highly dense nanofilms. As a consequence of the effective tiling by controlled convection, the films appeared flat on the atomic scale and uniform over a large area. We also address characteristics of single droplet assembly in comparison with other deposition methods.

Ta substituted (K,Na)NbO₃ powders with K-rich composition across polymorphic phase boundary were synthesized at 200 °C by hydrothermal method. The amount of Ta content in the powders was controlled by changing the nominal composition of raw powders, C = [Ta₂O₅]/([Nb₂O₅] + [Ta₂O₅]). Elemental mappings using a transmission electron microscope showed all the elements (K, Na, Nb, and Ta) were contained in the powders. X-ray diffraction measurement showed that (K,Na)(Nb,Ta)O₃ solid solution powders can be obtained for all nominal compositions (C = 0–1), and that the orthorhombic-tetragonal phase transition can be induced by controlling C value, yet the diffraction peaks arising from a secondary phase were also detected in the range of C = 0.5–1. Scanning electron microscopy (SEM) observation revealed that the morphology of powder changed from polymorphic to square, and the size of the square-shaped (K,Na)(Nb,Ta)O₃ powder decreased, with increasing the nominal composition. Temporal evolution of the emerged phases revealed that the range of intermediate phase became shorter with increasing the nominal composition, allowing the perovskite phase to form from early stages. In addition, the cause of the secondary phase was unreacted raw powder. Observations on the powder synthesis with end-member composition (KOH–Nb₂O₅, NaOH–Nb₂O₅, KOH–Ta₂O₅, and NaOH–Ta₂O₅) has shown that perovskite single-phase was formed in KOH-Nb₂O₅, NaOH-Nb₂O₅, and KOH-Ta₂O₅, while that unreacted raw powder was detected in the combination of NaOH and Ta₂O₅. These results demonstrated that Ta substitution is an effective way to control the morphology of powder and that the synthesis behavior of (K,Na)(Nb,Ta)O₃ is strongly dependent on the combination of alkaline solution and raw powder.

Melt quenching method was applied to prepare the long persistent phosphor SrAl₂O₄:Eu²⁺,Dy³⁺, and Dy³⁺ concentration dependence of afterglow property was investigated. Melt quenched SrAl₂O₄:Eu²⁺,Dy³⁺ phosphors exhibit brighter afterglow intensity compared with these synthesized by a conventional solid-state reaction method. The afterglow property was improved with increase of Dy³⁺ concentration, and 10 mol % Dy³⁺ co-doped sample exhibits approximately 1.3 times higher afterglow intensity than commercially available phosphor.

Mn₃CuN thin films were prepared using dynamic aurora pulsed laser deposition (PLD), which enables magnetic field application during film growth. The magnetic field can stabilize a plasma state of nitrogen in plume generated from a nitride target. Results show that Mn₃CuN phase with high crystallinity is observed clearly and grown epitaxially on MgO(001) in the as-grown thin films. The as-grown thin films show ferromagnetic transition near 150 K without post-annealing, indicating almost no nitrogen deficiency. These results suggest that dynamic aurora PLD is effective for nitride thin films with high crystallinity.

Lead-free ferroelectric and piezoelectric ceramics, (Bi_0.5Na_0.5)TiO₃ (BNT), with Mg and Nb additives were prepared and the concentration of oxygen vacancies as the ¹⁸O tracer diffusion of these ceramics were clarified by secondary ion mass spectroscopy (SIMS). Moreover, the samples were quenched after sintering to examine the depolarization temperature T_d, and then their electrical properties were investigated. As a result, the obtained values of volume diffusion coefficient D of BNT doped with 0.4 wt % Mg and 0.4 wt % Nb were determined to be 9.2 × 10⁻¹¹ and 1.1 × 10⁻¹³ cm²/s, respectively. The oxygen vacancy concentration increased with the amount of Mg added and decreased with that of Nb added. Moreover, quenching increased T_d by ∼50 °C in BNT with the Mg additive (Mg x) and ΔT_d also increased. Thus, the effect of quenching was promoted by Mg x. On the other hand, the T_d of BNT with the Nb additive (Nb y) also increased despite the low concentration of oxygen vacancies. This is because the D of pure BNT (no additives) was revealed found to be 2.5 × 10⁻¹¹ cm²/s, that is, pure BNT originally contained a high concentration of oxygen vacancies. The concentration was maintained even after quenching, then D showed 1.8 × 10⁻¹¹ cm²/s. In addition, the electromechanical coupling factor k₃₃ of the quenched ceramics remained similar to that of the ordinarily fired samples of BNT with the Mg and Nb additives.

Epitaxial Sr-excess SrTiO₃ (ST) thin film (Sr/Ti = 1.41) was grown on ST(001) and ST(101) single-crystal substrates using dynamic aurora pulsed laser deposition (PLD) under a 200 mT magnetic field. The films spontaneously formed a superlattice structure comprising two layers having different concentrations of Ruddlesden–Popper (RP) planar faults. The superlattice periods of Sr-excess ST thin films deposited on ST(001) and ST(101) substrate were, respectively, 35 and 23 nm. For thin film deposited on ST(001), the in-plane lattice parameter coincided with the substrate, showing coherent growth. For thin film deposited on ST(101), coherent growth occurred along a direction ±45° declined against the substrate. The spontaneously formed superlattice was brought about by “up-hill diffusion” of spinodal decomposition. The direction of propagation of the composition wave of spinodal decomposition was regarded as perpendicular to the substrate and ±45° declined against the substrate for thin films deposited respectively on ST(001) and ST(101). The superlattice period of the thin film deposited on ST(101) (23 nm) is smaller by a factor of 1/√2 than that deposited on ST(001). This relation is explainable by the difference of the propagation direction of the composition wave. The thin film deposited on ST(001) is distorted tetragonally, whereas that on ST(101) is cubic. The Sr-excess ST thin film was also deposited on La-doped ST(101) (La-ST(101)) and La-ST(101) substrates to measure electrical properties. No change was found in the crystal structure and microstructure, irrespective of La-doping. The thin film deposited on La-ST(001) showed ferroelectricity. However, the film deposited on La-ST(101) shows no ferroelectricity. The difference of electrical properties is brought about by differences of crystal symmetry. The difference is also explainable from the perspective of thermodynamic phenomenology.

Undoped and Ce-doped LiAlO₂ single crystals, a novel neutron scintillator, were synthesized by the floating zone method, and the photoluminescence and scintillation properties were investigated. Under X-ray irradiation, all the synthesized crystals showed luminescence due to oxygen vacancies with decay time constants of 250 ns and 2 µs, and Ce-doped LiAlO₂ crystals showed luminescence due to the 5d–4f transition of Ce³⁺ with a decay time constant of 40 ns as well. In the pulse height spectra under neutron irradiation from ²⁵²Cf, the synthesized crystals exhibited thermal neutron peak, and scintillation light yields increased by doping of Ce. Furthermore, neutron and gamma-ray pulse shape discrimination was examined, and 0.5 and 1.0 % Ce-doped ones showed a distinction of neutron and gamma-ray events.

We have developed a LiF/CaF₂:Tb eutectic composite as a novel thermoluminescence (TL) dosimetric material. The LiF/CaF₂:Tb eutectic composite was obtained using a melt-solidification method with a lower melting temperature than that of LiF and CaF₂. The results of the PL emission and excitation spectra, the X-ray induced radioluminescence decay curve, and the TL emission spectrum indicate that the emissions of LiF/CaF₂:Tb eutectic composite are due to 4f-4f transitions of the Tb³⁺ ion. The integrated TL intensity of the LiF/CaF₂:Tb eutectic composite was 3.6 times higher than that of the commercial CaSO₄:Tm dosimetric material that is known to show a relatively high TL intensity. The dose response curve of the LiF/CaF₂:Tb eutectic composite was measured and the lower detection limit was 0.01 mGy which is the lowest value among the LiF/CaF₂ based composites.

Photoluminescence and scintillation properties are reported for SrCl_2−xBr_x:Yb²⁺ (x = 0, 0.3, 1.4, 1.6, and 2.0) crystals grown by a self-seeding solidification method. SrCl_2−xBr_x have been reported to crystallize in some structural types with different local site symmetries depending on the Cl/Br ratio. Taking advantage of this property, we can control the crystal structure and the local Yb²⁺ site symmetry of SrCl_2−xBr_x:Yb²⁺ by changing the compositions and investigate the behaviors of the spin-allowed and spin-forbidden transitions dependent on the local site symmetry. For photoluminescence and scintillation, both spin-allowed and spin-forbidden Yb²⁺ 5d–4f transitions were observed for SrCl₂:Yb²⁺ with local O_h symmetry and SrCl_0.4Br_1.6:Yb²⁺ and SrBr₂:Yb²⁺ with local C_4h symmetry, whereas only spin-forbidden Yb²⁺ 5d–4f transition was observed for SrCl_1.7Br_0.3:Yb²⁺ and SrCl_0.6Br_1.4:Yb²⁺ with local D_2h symmetry. The spin-allowed transitions were observed in crystals with higher local site symmetry. Light yields of SrCl_2−xBr_x:Yb²⁺ (x = 0, 0.3, 1.4, 1.6, and 2.0) were (21000 to 71000) photons/MeV. Crystals with higher local site symmetry, which showed the spin-allowed transitions, had relatively high light yields. Among them, SrCl_0.4Br_1.6:Yb²⁺ showed a light yield of 71000 photons/MeV, which is higher than those of previously reported Yb²⁺-doped scintillators, for example, SrI₂:Yb²⁺ (56000 photons/MeV) and CsBa₂I₅:Yb²⁺ (54000 photons/MeV).

High-speed rechargeable Li ion batteries are in strong demand. Two methods have been reported to improve the high-speed rechargeability of electrodes: reducing particle size and introducing a surface support. However, the effectiveness of the latter could not be directly compared among reports due particle size differences from study to study. Our previous report revealed that Li⁺ motion under high-speed charge–discharge conditions is accelerated around a surface-supporting material, an electrode, and an electrolyte interface. In this study, we prepared epitaxial LiCoO₂ thin films with micropads of various kinds of materials and evaluated the high-speed rechargeability of each.

Radio-photoluminescence (RPL) is a phenomenon whereby a new luminescent centre is generated in a material by the interaction of an ionizing radiation with the medium. Despite the usefulness of RPL, e.g. in radiation measurements, there are only a limited number of RPL materials available today, which limits our understanding of the phenomenon as well as extending its use for new applications. In recent investigations, a large number of new RPL material systems have been proposed for radiation measurements. In particular, Sm-based RPL is one of the most intensively studied alternative systems, which shows RPL properties owing to the intravalence reduction of the Sm ion (Sm³⁺ → Sm²⁺) induced by ionizing radiation. The generated Sm²⁺, as well as Sm³⁺, acts as a luminescent centre and shows photoluminescence, typically around 700 nm. This approach has enabled us to explore a wider range of material choices and to find a new application of RPL. An example is microbeam radiation therapy (MRT), which requires the measurement of extremely large radiation dose distributions at a microscopic scale. Such a new class of RPL is not only limited to Sm-based materials but also to those doped with other rare earth ions (e.g., Eu and Yb) and undoped materials.

Present study showed synthesis of novel type of porous alkali niobate piezoelectric ceramics, and the formation of domains and photocatalytic activity for the porous piezoelectric ceramics were investigated while comparing with dense ceramics to confirm enhancement of domain orientation and photocatalytic activity around pores. Porous Li_0.06Na_0.47K_0.47NbO₃ piezoelectric ceramics were synthesized by a template method using polymethylmethacrylate as a pore former agent. Uniform pores with 6 µm in diameter were dispersed in the porous ceramics. Porous ceramics synthesized with 10 vol % of the pore former agent showed piezoelectric voltage coefficient, 29 mVm/N, which is same as that of the dense ceramics. Smaller striped domains formed at an edge of pores on the porous ceramics, indicating that orientation of domains was promoted by electric field concentration around the pores. Through photoreduction reaction of Ag⁺ ion, local precipitation of Ag was shown around the pores on the poled porous ceramics, whereas Ag was located over an entire surface of unpoled porous ceramics. Highest photocatalytic activity was shown for the poled porous ceramics in photodecomposition test of methylene blue. These results clearly indicated photocatalytic activity was enhanced on ferroelectric domains around pores of porous piezoelectric ceramics.

Aeschynite-type fine crystals of YTiTaO₆ and Er³⁺- and Yb³⁺-co-doped YTiTaO₆ (YTiTaO₆:Er³⁺/Yb³⁺) were synthesized for the first time using hydrothermal method at 240 °C. The effects of Yb³⁺ and Er³⁺ concentrations and heating temperature in air on their crystalline phases were investigated. The images of transmission electron microscope (TEM) and energy dispersive X-ray spectrometry (EDS) elemental mapping showed that their metal cations were dispersed homogeneously in the cube-like crystals in the range of 200–300 nm. A single phase of aeschynite appeared in all of the as-prepared YTiTaO₆ and YTiTaO₆:Er³⁺/Yb³⁺ samples synthesized hydrothermally at 240 °C and samples after heating at 1100 and 1200 °C in air although YTiTaO₆ is known to possess euxenite-type structure. The lattice constants of the orthorhombic aeschynite phase decreased slightly according to the Vegard’s law as the concentration of Yb³⁺ was increased from y = 0 to 0.30 in the Er_0.10Yb_yY_0.90−yTiTaO₆ system. Under excitation at 270 nm the pure YTiTaO₆ showed light blue green and broadband photoluminescence centered at 520 nm. The aeschynite-to-euxenite phase transition occurred completely in the whole Yb³⁺ concentration range, y = 0–0.30 in Er_0.10Yb_yY_0.90−yTiTaO₆ and pure YTiTaO₆ as a consequence of heating at 1400 °C for 1 h in air.

A glass fiber cloth (GFC) with microporosity was prepared upon the suppression of crack generations. After the prepared GFC was heat-treated, it was slowly cooled to room temperature and then subsequently treated with hydrochloric acid. The experimental data through complementary techniques including scanning electron microscopy, nitrogen adsorption/desorption isotherm, solid-state ²⁹Si nuclear magnetic resonance spectroscopy, and elemental analysis revealed the conversion of the slowly-cooled GFC into a microporous solid with no cracks in each glass fiber upon the alkaline leaching by hydrochloric acid. These results clearly indicated the formation of microporous GFC without cracking.

In order to impart nano hydroxyapatite (HA) more biological functions and develop its potential application in biomedical field, silver modified hydroxyapatite (Ag-HA) nanoparticles were synthesized via sol–gel method. The powders were sintered at 600 °C for 1 h. The microstructures, morphologies and chemical compositions of HA and Ag-HA were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), High resolution transmission electron microscopy (HR-TEM), Scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDS). The results indicate that Ag modification has a certain effect on the microstructure, morphology and Zeta potential of HA. The hemocompatibility of HA and Ag-HA with different doses were evaluated by lots of hemolytic tests. The results indicate that pure HA performs non-hemolytic activity at the dose range of 20–2000 µg/cm³. Due to the appearance of Ag, the hemocompatibility of Ag-HA with different Ag concentration show obvious differences. The Ag-HA with concentration of 0.5 mol % Ag (0.5Ag-HA) has better hemocompatibility, its hemolytic ratio is less than 5 % when its usage dose is up to 1000 µg/cm³. But Ag-HA with concentration of 1.0 mol % and 1.5 mol % Ag (1.0Ag-HA and 1.5Ag-HA) show non-hemolytic property only lower doses. The antibacterial ratio of 0.5Ag-HA against Streptococcus mutans is up to 99 % only the dose of 400 µg/cm³. The biological evaluation further confirmed the safe dose of the antibacterial HA nanoparticles for its application in biomedical field.

Platinum (Pt) was selectively photodeposited onto zinc rhodium oxide (ZnRh₂O₄) to serve as a hydrogen (H₂)-evolution photocatalyst in a silver (Ag)-inserted ZnRh₂O₄ and bismuth vanadium oxide (Bi₄V₂O₁₁) solid-state photocatalyst (ZnRh₂O₄/Ag/Bi₄V₂O₁₁). The amount of deposited Pt was controlled by the photodeposition time to generate Pt-loaded ZnRh₂O₄/Ag/Bi₄V₂O₁₁ (Pt/ZnRh₂O₄/Ag/Bi₄V₂O₁₁) containing up to 0.17 wt % of Pt cocatalyst. The prepared Pt/ZnRh₂O₄/Ag/Bi₄V₂O₁₁ photocatalysts were able to catalyze the overall pure-water splitting reaction under irradiation with red light at a wavelength of 700 nm and enhanced the stoichiometric evolution of H₂ and O₂ from water at Pt amounts exceeding 0.12 wt % of Pt. The apparent quantum efficiency of the water-splitting reaction was highest at 0.17 wt % of Pt. In addition to the loading amount of Pt, the loading of Pt as Pt⁰ (metallic Pt) is crucial for enhancing the water-splitting activity of Pt/ZnRh₂O₄/Ag/Bi₄V₂O₁₁.

All-solid-state batteries using oxide electrolytes are regarded as safe batteries. However, most crystalline oxide solid electrolytes require high-temperature sintering for densification. Oxide electrolytes with high formability, which enable the construction of high-performance batteries, are thus required. In this study, Li₄SiO₄–Li₂SO₄ glasses and glass-ceramics were prepared by mechanochemical treatment and subsequent heat treatment at 270 °C to achieve electrolytes with high formability. As the Li₂SO₄ content was increased, the formability of the electrolyte increased. The 90Li₄SiO₄·10Li₂SO₄ glass-ceramic electrolyte with a hexagonal structure (a P6₃/mmc space group) showed the highest ionic conductivity of 2.2 × 10⁻⁶ S cm⁻¹ at 25 °C. In this crystal structure, oxygen anions form a hexagonal close-packed structure, and silicon and sulfur cations randomly occupy the tetrahedral sites formed by oxygen anions. An all-solid-state Li–In/LiNi_1/3Mn_1/3Co_1/3O₂ cell using a 90Li₄SiO₄·10Li₂SO₄ glass-ceramic electrolyte operated at 100 °C as a secondary battery without high-temperature sintering. These oxide materials are promising solid electrolytes for oxide-type all-solid-state batteries.

Gaseous volatile organic pollutants may be removed from the environment through photocatalysts combined with adsorbents. Herein, a mesoporous SiO₂–TiO₂/WO₃ composite was fabricated by the sol–gel method in order to remove acetaldehyde in the gas phase. TiO₂ and WO₃ were well-dispersed in the SiO₂ matrix. The adsorption-photodecomposition properties of mesoporous SiO₂–TiO₂/WO₃ were evaluated through a three-step kinetic analysis, including direct-decomposition, adsorption, and adsorption-decomposition. The composition of WO₃ in the SiO₂–TiO₂ increased the acidity and improved the affinity between the photocatalyst and acetaldehyde. This effectively enhanced the initial removal rate of acetaldehyde. The atomization of WO₃ further improved the affinity between the photocatalyst and acetaldehyde and enhancing the photodecomposition rate constant.

To investigate a dynamic intercalation behavior of organic anions into layered double hydroxide (LDH) interlayer by ion-exchange, a quartz crystal microbalance (QCM) with the Mg–Al LDH thin film immobilized gold disc (LDH/QC) electrode has been used. A stable minute LDH film was prepared by using translucent aqueous sol of LDH containing OH⁻ ions and magnesium acetate molecule in the interlayer and immobilized on the gold disc after pretreatment of the surface of the supporting silica electrode with hydrophobic agent. In the kinetic analysis, alkyl sulfates having n-alkyl chain (C_nH_2n+1, n = 5–12; abbreviated as C_nS) were used as guest anions. As the results, the time-dependence on C_nS intercalation by ion-exchange with guest OH⁻ ions and magnesium acetate molecules was measured in the cases of C_nS (n ≥ 7), and the data of C₁₁S and C₁₂S intercalation were successively analyzed using the rate equation based on the reversible pseud first-order reaction. Finally, the instrumental analyses of the LDH films before and after the intercalation of C₁₂S revealed that the organic anions could be intercalated into the LDH interlayer of the LDH/QC electrode in each aqueous solutions.

The stability of the LiC₆/β-Li₃PS₄ interface was examined by performing calculations within the density functional theory framework. The calculated adhesion energy of the interface was 4.8 eV·nm⁻², indicating that the LiC₆(100) and β-Li₃PS₄(010) surfaces were joined the same strength as the interface with the cathode electrode. Lithium ions were periodically present near the LiC₆/β-Li₃PS₄ interface.

We examined the influence of diamond-etching conditions on microneedles fabricated by a thermochemical reaction between a Ni film with pinholes and a diamond (100) wafer in an H₂ atmosphere. The diamond microneedles fabricated by varying the annealing temperatures and thickness of the Ni film coated on the diamond were characterized by scanning electron microscopy. Relatively uniform and long diamond microneedles, with diameters of about 1 µm and heights of about 20 µm, were obtained by annealing for 6 h at 850 °C. For Ni films thicker than 1 µm, microneedles with inverted conical shape were obtained, whereas those fabricated with thinner Ni films exhibited a conical shape.

Thin La₂Mo₂O₉ (LMO) films were prepared using wet processing with acetylacetonates as starting materials. After acetylacetonates of La and Mo were dissolved into a mixture of 2-methoxyethanol and acetylacetone, the obtained precursor solution was coated onto Pyrex glass plates by spin coating. Transparent porous LMO thin film was obtained after vacuum ultraviolet light illumination and firing at 500 °C for 1 h in ambient air. The film exhibited antibacterial and antiviral activities that were almost equivalent to those of LMO powder against Escherichia coli, Staphylococcus aureus, bacteriophage Qβ, and bacteriophage Φ6.