Norifumi Asakuma, Shotaro Tada, Tomoyuki Tamura, Erika Kawaguchi, Sawao Honda, Toru Asaka, Assil Bouzid, Samuel Bernard, Yuji Iwamoto
Herein, nanocomposites made of Ni nanoparticles in situ distributed in an amorphous silicon nitride (Ni/a-Si3 N4 ) matrix, on the one hand, and within an amorphous silicon dioxide (Ni/a-SiO2 ) matrix, on the other hand, were synthesized from the same Ni-modified polysilazane precursor. In both compounds, the Ni/Si atomic ratio (0.06-0.07), average Ni nanocrystallite size (7.0-7.6 nm) and micro/mesoporosity of the matrix were rigorously fixed. Hydrogen (H2 )-temperature-programmed desorption (TPD) profile analysis revealed that the activation energy for H2 desorption at about 100-130 °C evaluated for the Ni/a-Si3 N4 sample (47...
March 8, 2024: Dalton Transactions: An International Journal of Inorganic Chemistry