Barium Tungstate Thin Film Preparation by Galvanic Cell Electrochemical Method
Tungstate scheelite structure is a kind of important laser material. They are tetragonal structures at room temperature and emit blue light from the tungstate crystals under UV excitation.
The study shows that the structure of barium tungstate always keeps tetragonal structure from room temperature to melting (1820 K), indicating that it has good structural stability. In view of the superior properties of barium tungstate, barium tungstate thin films are often in short supply in the fields of luminescence and display technology, laser and photoelectron technology, and detection technology. In recent years, the electrochemical technology of galvanic cell has been used more and more in the field of preparation of inorganic functional films because of its advantages of one-step film forming, no post-processing and environmental coordination. Compared with electrolytic electrochemical technology, this technology has the advantage of zero energy consumption. Therefore, electrochemical deposition of galvanic cells is a new and environmentally compatible technique for the preparation of thin films.
Barium tungstate thin films were prepared by galvanic electrochemical technique at room temperature. The purity of 99.9% and polished the metal tungsten film as working electrode, immersed in saturated barium hydroxide solution, Pt is used as auxiliary electrode and Ag / AgCl electrode as reference electrode to form primary battery system and sealed electrolytic cell. After the reaction has been completed, samples are removed and rinsed with deionized water several times to dry and to obtain barium tungstate thin films.
The study found that these films are highly crystalline, scheelite structure, and the element valence is also consistent with the theoretical value. Under the condition of primary cell, the quality of the film is obviously improved, and the micro crystal also tends to be regular square conical particles. Under the excitation of ultraviolet light, the barium tungstate thin film produces a blue emission band with a center at 460 nm and a half height of 140 nm. The results show that electrochemical deposition of galvanic cells provides a convenient, cheap and environmentally friendly process for the preparation of barium tungstate.
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