Preparation of nickel ultrafine powder and crystalline film by chemical control reduction

Synthesis and photosensitivity of SnS nanobelts

“…On the other hand, hydrazine hydrate as a chelating agent can control the growth and direct the structure-formation of crystals due to the selective absorption of molecules and ions in reaction mixture on different crystal faces [15]. In above synthetic systems, the chemical reactions can be expressed as the following equations: Stannous chlorides will firstly dissociate to release metal ions which then react with hydrazine to form the relatively stable metal ions complex [16]. Secondly, the S 2− is produced from thiourea through hydrolysis reaction with increasing the reaction temperature.…”

Preparation of mono-disperse Ni powders via the reduction of hydrazine complexes: The effect of source materials and impurities

“…The addition of easily-reducible impurities such as Agand Pd-salts to a Ni 2+ -containing starting solution decreases the Ni particle size in the solution reduction [9,13] and polyol process [7]. Considering the large differences in the standard reduction potential (E • (Pd 2+ /Pd) = 0.83 V, E • (Ag 2+ /Ag) = 0.80 V, E • (Ni 2+ /Ni) = −0.23 V) [15], the decrease in particle size can be attributed to the promotion of the heterogeneous nucleation of Ni on the seeds of Pd or Ag.…”

“…The Ni powder for MLCC can be prepared via vapor phase methods [3], spray pyrolysis [4,5], solution chemical routes such as the polyol process [6,7], and reduction in an emulsion [8], aqueous [9][10][11][12] and non-aqueous solutions [13]. Among the various routes for Ni powder synthesis, the reduction in the solution is a cost-effective and promising approach for preparing crystalline and spherical Ni powders.…”

“…The reduction of a complex between the Ni-salt and a reducing agent (N 2 H 4 ) in the presence of OH − ions is the typical reaction route. However, most studies focused on the change in the powder characteristics by varying the concentrations of the source material [11], hydrazine [8], and the surfactant [9]. During the reduction reaction, the type of source material, complex states and impurity concentrations can play important roles in the nucleation and growth of Ni particles.…”

Synthesis conditions in tailoring morphology of reticular particles in porous nickel powders prepared by template-assisted polyol process

“…[6][7][8][9][10]. Among these methods, the chemical solution process is a costeffective and promising approach for large-scale production and control of structure and morphology of the particles [11,12].…”