Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 230, Issue -, Pages 381-389Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2015.07.040
Keywords
Co-precipitation; Nickel; Zinc; Zn-doped NiO; Nanocomposite
Funding
- Universite Catholique de Louvain (UCL) [SPER/DST/525-1122601]
- Cooperation au developpement in Belgium
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Nanoparticles of Ni1-xZnxO and Ni1-xZnxO/ZnO, which can be good candidates for selective gas sensors, were successfully obtained via a two-step synthetic route, in which the nickel zinc malonate precursor was first synthesized by co-precipitation from an aqueous solution, followed by pyrolysis in air at a relatively low temperature (similar to 500 degrees C). The precursor was characterized by ICP-AES, FTIR and TG and the results indicate the molecular structure of the precursor to be compatible with Ni1-xZnx (OOCCH2COO).2H(2)O. The decomposition product, characterized using various techniques (FTIR, XRD, ToF-SIMS, SEM, TEM and XPS), was established to be a doped nickel oxide (Ni1-xZnxO for 0.01 <= x <= 0.1) and a composite material (Ni1-xZnxO/ZnO for 0.2 <= x <= 0.5). To elucidate the form in which the Zn is present in the NiO structure, three analytical techniques were employed: ToF-SIMS, XRD and XPS. While ToF SIMS provided a direct evidence of the presence of Zn in the NiO crystal structure, XRD showed that Zn actually substitutes Ni in the structure and XPS is a bit more specific by indicating that the Zn is present in the form of Zn2+ ions. (C) 2015 Elsevier Inc. All rights reserved.
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