Bulk and Thin Films of Bismuth Vanadates Prepared from Hybrid Materials Made from an Organic Polymer and Inorganic Salts

Abstract

A new precursor route for the preparation of bulk oxides and thin films of bismuth vanadates is proposed. The method involves the thermal treatment under air and mild conditions of hybrid organic-inorganic precursors, made from a zwitterionic salt-free polymer matrix and selected inorganic species. Monoclinic BiVO 4 was obtained in the form of bulk oxide by calcination of the powdered homogeneous hybrid materials at 600 °C, from precursors containing Bi and V in stoichiometric amounts. In the same way, thermodiffractometry studies performed on a hybrid material exhibiting a Bi/V molar ratio of 2 revealed that the ionic conductor γ-Bi 4 V 2 O 11 phase can be stabilized under very soft thermal conditions (300 °C). Additionally, thin films of yellow monoclinic BiVO 4 were for the first time fabricated, by thermal treatment of the same hybrid polymeric precursors deposited on quartz substrates by spin coating, using a layerby-layer technique. The presence of the target phase at the surface of the plates was confirmed by X-ray diffraction as well as UV-vis measurements.

The synthesis of bismuth vanadate powders and their photocatalytic properties under visible light irradiation

“…42-0135), shown in Fig. 1b, which has been synthesized and investigated for its dielectric, pyroelectric, and ferroelectric properties [1,43,52,53]. Zhou et al reported that when the pH value was higher than 9, no BiVO 4 was obtained due to the strong complex ability between Bi 3+ and OH − , with Bi(NO 3 ) 3 , NH 4 VO 3 , HNO 3 and NaHCO 3 as raw materials [42].…”

“…Zhou et al reported that when the pH value was higher than 9, no BiVO 4 was obtained due to the strong complex ability between Bi 3+ and OH − , with Bi(NO 3 ) 3 , NH 4 VO 3 , HNO 3 and NaHCO 3 as raw materials [42]. Rullens et al reported that Bi 4 V 2 O 11 was prepared from hybrid material exhibiting a Bi/V molar ratio of 2, and thermodiffractometry studies indicated that Bi 4 V 2 O 11 phase could be stabilized under very soft thermal conditions (300 • C) [43]. In this experimental condition, Bi 4 V 2 O 11 phase was formed in alkaline condition adjusted by addition of Na 2 CO 3 , indicating that the alkaline condition is more beneficial to the formation of Bi 4 V 2 O 11 phase.…”

“…The investigation results indicate that the photocatalytic activity of BiVO 4 strongly depends on its crystal form and morphology [3,5,7,11,12,[14][15][16]18,42,43], and monoclinic BiVO 4 shows the highest photocatalytic activity [3,5,9,12,14,15,17,18,22,44]. The phase formation and morphology of BiVO 4 are related to the synthetic method, raw materials, and reaction conditions [3,8,12,15,42].…”

Matrix-induced synthesis and photoluminescence of M2RENbO6: Eu3+ (M=Ca, Sr, Ba; RE = Y, Gd, La) phosphors by hybrid precursors

“…Recently, the development of new methods for the preparation of micron or submicron or nano phosphors may increase the possibilities for high effective rare earth phosphors [17][18][19][20][21][22]. For example, the sol-gel technology based on hydrolysis and polycondensation process is the most popular, which has been verified to be very useful in the synthesis of nonagglomerated nanoparticles with surface accessibility for treatments and able to be used in thin-film techniques related to the sol-gel process [23][24][25][26][27][28][29][30][31]. Besides this, chemical coprecipitation is also in common use to obtain the precursors for the preparation of luminescent materials, which is based on the wet solution chemical synthesis, just like sol-gel process [32][33][34][35][36][37].…”

NiMoO4 preparation from polyampholytic hybrid precursors: Benefiting of the memory effect in the oxidative dehydrogenation of propane

“…creation of an organised pore volume into the mixed oxides). Thus, the impact of the presence and degradation of the copolymer matrix on the physico-chemical properties (morphology, texture, structure) and the catalysts behaviour is a key point of this study [15,16].…”