Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
This book deals with the synthesis and characterization of NiO deposited by Chemical Bath Deposition method using solution of Ni(NO3)2.6H2O. X-ray diffraction investigation showed cubic crystal structure of NiO with preferred orientation along (200). The scanning electron microscopy images exhibited a porous structure morphology composed of nanosheets. The network of linked nanosheets and voids offers a large number of pathways and more reactive sites for gas diffusion. TEM image reveals an average size of 5 nm for NiO. AFM reveals roughness of 107.9 nm for NiO deposited at 7 h. BET measurement gives the specific surface area of 110.42 m2g-1. The XPS study showed that the presence of mixed Ni2+ and Ni3+ chemical states of Ni at about 853.70 and 855.44 eV, respectively on the NiO surface due to non-stoichiometry of the film. The direct band gap energy of around 3.6-3.7 eV was obtained by UV-Vis measurement for all NiO films. 45.6% response is obtained to 100 ppm NO2 at 200 °C with T_response = 13 s and T_recovery = 146 s. The highest response of 45.6% to 100 ppm NO2 showed that NiO is a good candidate for environmental monitoring at moderate working temperature of 200 °C.
