Plasma-Fluorination Synthesis of High Surface Area Aluminum Trifluoride from a Zeolite Precursor

Patterned aluminum nanowires produced by electron beam at the surfaces of AlF3 single crystals

“…3). These results differ from the morphology previously reported by other groups who have synthesized a-AlF 3 through plasma-assisted fluorination reaction with nitrogen trifluoride [11] and thermal decomposition of hexafluoroaluminate [13]. In those studies, porous a-AlF 3 was synthesized and the surface morphology is rather rough.…”

“…The AlF 3 films prepared by chemical method are mostly rough at the surface and have a polycrystalline structure [11]. The first task of our study is to synthesize single crystalline AlF 3 .…”

Amorphous Metal Fluorides with Extraordinary High Surface Areas

“…Sideband simulations indicate QCCs of about 1.5 MHz which is much larger than that of the highly symmetric a-AlF 3 , but comparable with the estimated 1.4 MHz of the nearly amorphous material. [6] The IR spectra of HS-AlF 3 support these findings. In the region fromñ n = 700-4000 cm À1 , there should be no absorption bands for AlF 3 .…”

“…[5] By a sophisticated NF 3 plasma-etching treatment of aluminum-rich zeolites it could be shown that AlF 3 with surface areas of up to 190 m 2 g À1 is in principal accessible. [6] Herein we report a novel facile non-aqueous synthesis route to X-ray amorphous metal fluorides that have high surface areas. First a solid, fluoridated metal compound is prepared, which is structurally highly distorted because of the presence of bulky groups in stoicheiometrical quantities.…”

Recent developments in the preparation of high surface area metal fluorides

“…One of the first reports on the synthesis of bulk HS metal fluorides appeared in 2001 when the preparation of AlF 3 with 190 m 2 g À1 was reported [9]. This HS fluoride was obtained by plasma fluorination of silica-rich zeolite, H 4 (kaolinite), resulted in a product consisting of aAlF 3 and b-AlF 3 with surface area of 32 m 2 g À1 .…”