Nanocomposites SnO2/Fe2O3: Wet chemical synthesis and nanostructure characterization

Chemical modification of nanocrystalline metal oxides: effect of the real structure and surface chemistry on the sensor properties

“…[15][16][17][18][19][20][21] The SnO 2 based nanocomposites were synthesized by the thermal decomposition of the α stannic acid gel fol lowed by impregnation with solutions of the correspond ing metal salts. The α stannic acid gel was precipitat ed 15-21 from an aqueous solution of SnCl 4 •5H 2 O by the addition of aqueous ammonia (to pH = 6.5-7.0) with continuous stirring at 0 °C.…”

“…[18][19][20][21] In all cases, several regions can be distinguished in the plots of S sp vs composition (Fig. 19).…”

Effect of Mn Doping on the Structural, Optical and Magnetic Properties of SnO2Nanoparticles

“…Nanocrystalline SnO 2 and Mn doped SnO 2 have been prepared by several methods such as co-precipitation [3], solgel [46], chemical vapour deposition [7,8], VLS method [9], laser ablation [10] and thermal redox process [11]. Among these methods, chemical coprecipitation method is most eective due to its capability in controlling the structural and surface properties of nanoparticles.…”

Preparation and characterization of nanocomposites in system as: SnO2–xTiO2 (where x = 25, 50 and 75 mol%)

“…It is should be emphasized that the existence of several dopants improve the crystalline features of SnO 2 powders through control particle size and shape [9][10][11][12]. Many authors report that the existence of iron oxide on SnO 2 surface has a dramatic role on reduction of the grain size of the samples and the resulting Sn 1-x Fe x O 2 nanocomposite exhibit higher catalytic activity and sensor signal than both pure SnO 2 and Fe 2 O 3 [9,13]. Azam et al [14] indicate formation of solid solution between nickel and tin oxide through incorporation of nickel in the crystal structure of tin oxide upon addition of small composition of nickel.…”

“…Several methods have been employed to synthesis nanomaterials with definite particle size and structure such as sol-gel [26,27], co-precipitation [28], and chemical vapor deposition [29]. The sol-gel method is the most effective and simple method in designing oxide framework with highly ordered structure.…”