Controllable Synthesis of Nickel Hydroxide and Porous Nickel Oxide Nanostructures with Different Morphologies

Abstract

Alpha-Ni(OH)(2) nanobelts, nanowires, short nanowires, and beta-Ni(OH)(2) nanoplates have been successfully prepared in high yields and purities by a convenient hydrothermal method under mild conditions from very simple systems composed only of NaOH, NiSO(4), and water. It has been found that the ratio of NaOH to NiSO(4) not only affects the morphology of the Ni(OH)(2) nanostructures, but also determines whether the product is of the alpha- or beta-crystal phase. A notable finding is that porous NiO nanobelts were produced after exposure of the Ni(OH)(2) products to an electron beam for several minutes during transmission electron microscopy (TEM) observations. Another unusual feature is that rectangular nanoplates with many gaps were obtained. Furthermore, porous NiO nanobelts, nanowires, and nanoplates could also be obtained by annealing the as-prepared Ni(OH)(2) products. A sequence of dissolution, recrystallization, and oriented attachment-assisted self-assembly of nanowires into nanobelts is proposed as a plausible mechanistic interpretation for the formation of the observed structures. The method presented here possesses several advantages, including high yields, high purities, low cost, and environmental benignity. It might feasibly be scaled-up for industrial mass production.

Enhanced mechanical, thermal and flame retardant properties by combining graphene nanosheets and metal hydroxide nanorods for Acrylonitrile–Butadiene–Styrene copolymer composite

“…No peaks for other phases are found in the as-synthesized nanorods. Ni(OH)2 obtained herein has very high peak intensity, suggesting that the nanomaterials are well crystallized [25]. Pure FeOOH with high crystallinity has been successfully synthesized, as evidenced by the diffraction peaks attributed to orthorhombic α-FeOOH [26].…”

“…Afterwards, the latter solution was added dropwise to the former solution under vigorous stirring. The mixed solution was then transferred to an autoclave and kept in an oven maintained at 180 °C for 24 h [25]. The synthesis procedure of FeOOH was similar to that of Ni(OH)2, using Fe(NO3)3·9H2O (12 mmol) and KOH (48 mmol) as starting materials.…”

Efficient electrochromic nickel oxide thin films by electrodeposition

“…Moreover its porous structure helps easier diffusion of ions and provides larger surface area for chargetransfer reactions. The improvement in the electrochromic activity of porous inorganic oxides has been reported in the literature [51][52][53].…”

Nanoparticles of nickel oxide and nickel hydroxide using lyophilisomes of fibrinogen as template

“…In this regard, nanosized nickel oxides are of great interest because they exhibit catalytic, anomalous electronic, and magnetic properties and the ability to tailor these materials for a variety of applications including electrochromic windows and sensors [3][4][5][6][7][8][9]. So far, many synthesis methods have been developed for fabricating nickel oxide nanocrystals.…”