Synthesis temperature dependence of morphologies and properties of cobalt oxide and silicon nanocrystals

Abstract

Cobalt and cobalt oxide nanocrystals were synthesized on Si substrates from aqueous cobalt nitrate [Co(NO 3 ) 2 $6H 2 O] powder via chemical vapor deposition method. Scanning electron microscope, field emission scanning electron microscope, and transmission electron microscope observations show different morphologies, such as continuous films, nano-bars, nano-dices, and nano-strings, depending on the synthesis temperature. The crystal structure characterization was conducted using Xray diffraction methods. Furthermore, the properties of the samples were characterized using Raman spectroscopic analysis and vibrating sample magnetometer. The morphology change was discussed in terms of synthesis environments and chemical interactions between cobalt, oxygen, and silicon.

Non-equilibrium defect chemistry in oxygen-rich zinc oxide nano-tetrapods synthesized using atmospheric pressure microplasma

“…92 Generally any variation in thermodynamic conditions (pressure and temperature) during synthesis could change the particle size, crystallinity, nano/microstructure, etc. 93 Particularly, lattice contraction is dominant in small-sized nanocrystals. 94 In the case of Au and Pt metal nanoclusters, the lattice parameter varies inversely with size.…”

Electronic Structures and Catalytic Activities of Niobium Oxides as Electrocatalysts in Liquid‐Junction Photovoltaic Devices

“…The phase transition from Nb 2 O 5 to NbO 2 under low oxygen partial pressure conditions (N 2 atmosphere) has been reported in many published papers . It is a common feature that transition metal oxides (such as Ta 2 O 5 , V 2 O 5 , and Co 3 O 4 ) change their phase structures and the corresponding chemical valences when heated in the low oxygen partial pressure conditions (N 2 atmosphere).…”