Ammonium metatungstate (AMT) is a chemical compound that is characterized by its unique physical and chemical properties. With the chemical formula of (NH4)6[H2W12O40], AMT has a white, crystalline appearance and is soluble in water. In this article, we will examine the various properties of ammonium metatungstate that make it useful for a range of industrial and technological applications.

Ammonium metatungstate (AMT) is a chemical compound that is formed by the combination of ammonium cations and metatungstate anions. With the chemical formula of (NH4)6[H2W12O40], AMT is a complex salt that is commonly used as a precursor for the production of tungsten powders and other tungsten compounds. This article will provide a comprehensive overview of ammonium metatungstate, including its properties, production, uses, and safety considerations.

Ammonium metatungstate, also known as ammonium paratungstate, is a chemical compound with the formula (NH4)10[(WO4)2O2]. It is a white, crystalline powder that is widely used as a precursor for the production of tungsten metal, tungsten alloys, and tungsten compounds. Some of the applications of ammonium metatungstate include:

Chemically grown multi-walled WS2 nanotubes are dispersed on SiO2/Si++ substrates. Isolated nanotubes were selected under an optical microscope. single crystals of WS2 were grown by chemical vapor transport. Bilayers and monolayers were mechanically peeled using tape.

The bulk photovoltaic effect (BPVE) in WS2 nanotube devices is quite stable in terms of quality and quantity. The large decrease in the short-circuit current (Isc) with decreasing temperature cannot be explained simply by a decrease in the absorption coefficient, because the band gap is blue-shifted with decreasing temperature. Light with a wavelength of 632.8 nm (1.96 eV) almost resonates with the A-exciton of WS2 (a specific bonded state of an electron and a hole) and therefore produces the strongest signal.

The short-circuit current (I_sc) under laser illumination is an important parameter for the evaluation of photovoltaic effects. We measured this current for WS2 bilayer device with different crystal symmetries. For each device, we scanned the laser spot from one electrode to the other to distinguish the BPVE from the Schottky barrier photovoltaic effect as well as the photothermal effect near the contact.

The bulk photovoltaic effect (BPVE) found in tungsten disulfide devices could further enhance energy conversion rates. The BPVE in conventional p-n junctions - where p-type materials (with excess holes) are adjacent to n-type materials (with excess electrons) - generates current through the light-induced generation and separation of electron-hole pairs. This BPVE is particularly important in energy applications, and its efficiency is now approaching its theoretical limit.

Titanium oxide tungstate nanotubes could improve fuel cell performance. The chemical oxidative stability of the tungstate-functionalized sulfonated poly ether ether ketone (SPEEK) membranes is one of the key requirements for the durability and performance of the fuel cells, which was estimated using Fenton's reagent method.

Ion exchange capacity is a vital property of ionic membranes, and this property is enhanced with the addition of ion-exchange materials. The IEC value of pure SPEEK membranes is 1.9 meq g^-1 due to the contribution of sulfonate group (SO₃H). increasing the content of tungstate titanium oxide nanotubes (W-TNT) in sulfonated poly ether ether ketone (SPEEK) membranes could improve the fuel cell ion-exchange capacity.

Among various two-dimensional materials, titanium oxide nanotubes (TiO2 nanotubes) are stable and environmentally friendly, and their electronic, optical, and dielectric properties can be tuned by surface modification. Researchers used tungstic acid covalently bonded to titanium oxide nanotubes (W-TNT) for the first time as an ion-exchange filler for the fabrication of proton exchange composite membranes. The tungstate group (H2WO4) contains exchangeable protons similar to the sulfonic acid group (SO3H) and can also be used as an ion exchanger.