Properties of boehmite and Al2O3 thin films prepared from boehmite nanofibres

Single Source Precursor Chemical Vapor Decomposition Method to Fabricate Stable, Bright Emissive Aluminum Hydroxide Phosphors for UV‐Pumped White Light‐Emitting Devices

“…Those two peaks nearly disappear for the sample S‐360. In previous work on the light‐emitting Al(OH) 3 NCs, the emission peak at 386 nm was attributed to F + centers, while the PL peaks at 457 and 518 nm may arise from carbon‐related defects formed during the decomposition of aluminum acetate hydroxide. To confirm this assumption, electron paramagnetic resonance (EPR) spectra of two samples S‐260 and S‐320 are compared in Figure S4a (Supporting Information).…”

“…Aluminum hydroxide, a very common, low‐cost intermediate compound in aluminum and aluminum oxide industry, exhibits different stable structures (Al(OH) 3 , AlOOH, 5Al 2 O 3 3H 2 O) and has been applied in plenty of fields including flame retardants, catalysis, waste treatment, medical and petrochemical industries . In recent years, different kinds of nanosized aluminum hydroxides such as γ‐AlOOH nanotubes, nanorods, nanoplates, nanofibers, nanobelts, nanoparticles, and nanowires, as well as Al(OH) 3 nanocrystals (NCs), have been reported. As demonstrated in previous works, their PL in ultraviolet and blue spectral regions originates from F + centers (oxygen vacancies occupied by one electron) or/and F centers (oxygen vacancies occupied by two electrons), which have low molar extinction coefficients resulting in low probability of electron–hole radiative recombination and thus rather low emission efficiency.…”

Effective adsorption and collection of cesium from aqueous solution using graphene oxide grown on porous alumina

“…The base pressure of the furnace was evacuated up to 6 × 10 −6 Pa. After the evacuation, the alumisol film was heated at 1000°C for 1 h in order to convert the alumisol into porous alumina. 18,19) Subsequently, the CVD growth of graphene was performed in the furnace at the same temperature by introducing 200 Pa methanol vapor for 30 min. 20) After the graphene growth, the graphene in the graphene=porous alumina film was oxidized based on the modified Hummers method.…”

A Highly Photoreflective and Heat‐Insulating Alumina Film Composed of Stacked Mesoporous Layers in Hierarchical Structure

“…Recently, novel nanofibers in a boehmite (AlOOH) phase with a length of 50–10 000 nm were synthesized in a sol form . Although aluminas and their precursors, e.g., boehmite, are well‐known oxides and have been handled from time immemorial as jewels, catalyses, and so on, the sol of the boehmite nanofibers opened new application fields for aluminas recently .…”

“…Although aluminas and their precursors, e.g., boehmite, are well‐known oxides and have been handled from time immemorial as jewels, catalyses, and so on, the sol of the boehmite nanofibers opened new application fields for aluminas recently . For example, representative nanofibers of 1400 nm in length can be induced to self‐assemble into flexible and transparent films with slit‐type micropores simply by drying the sol, which enable us to handle them easily and to apply them as a nanospaced container . By using boehmite nanofibers of 3000 nm in length and adding ammonia (NH 3 ) to perturb the self‐assembly of the fibers during drying of the sol, a heat‐resistive mesoporous film with the properties of high photoreflectivity and heat insulation (low heat‐conduction) was realized.…”