The Effects of Heat Treatment on the NiO Nanoparticles
- PDF / 775,019 Bytes
- 5 Pages / 612 x 792 pts (letter) Page_size
- 48 Downloads / 195 Views
The Effects of Heat Treatment on the NiO Nanoparticles Dongyun Han 1*, Hongyan Wang2 1. School of Petrochemical Engineering, Liaoning Shihua University, 1# Dandong Road, Fushun, 113001, P. R. China 2. School of Electromechanical Engineering, Fushun Vocational Technology Institute, 7#, Xincheng Road, Fushun,113006,P. R. China
*Corresponding author: Dongyun Han, School of Petrochemical Engineering, Liaoning Shihua University, 1# Dandong Road, Fushun, 113001, P. R. China, tel: 86-13842354916, fax: 86-0413-6860937, e-mail address: [email protected]
Abstract The microemulsion method is one of the effective methods for preparing nanoparticles in recent years. It has the advantages of simple apparatus, easy operation and controllable particle size. The precursors of NiO nanoparticles were successfully prepared in TritonX-100/n-hexanol/cyclohexane/water W/O microemulsion system using nickel chloride and ammonia water as raw materials. NiO nanoparticles were obtained after heat treatment of the precursors. The effects of heat treatment on the morphology and size distribution of NiO nanoparticles were systematically investigated. The result showed that the size, morphology and dispersion of NiO nanoparticles in the microemulsion state were much better than that in the state after heat treatment. XRD and TEM also showed the size of the NiO nanoparticles increased largely with the increase of heat treatment temperature.
Introduction NiO, a semiconductor with complex band gap, has prospects for many applications such as catalyst, battery cathode, gas sensors, electro- chromic films and magnetic material. Alternatively, NiO has a cubic rock salt structure with a lattice parameter of 0.4195 nm, which is considered to be an ideal semiconductor of hole-type conductivity [1-5]. Microemulsion to prepare ultrafine particles represents an effective pathway. Water-in-oil microemulsions consist of nanometer sized water droplets dispersed in a continuous oil medium, which is stabilized by surfactant molecules. These reverse micelle systems are heterogeneous on a molecular scale, but thermodynamically stable. Reverse micelles are suitable reaction media for the synthesis of nanoparticles, since water droplets represent nanoreactors, which favor the formation of small
crystallites with a narrow size distribution. This method offers several advantages: it is a soft technique, does not demand for extreme temperature or pressure conditions, can be used to perform several chemical reactions and does not require any special equipment. In this paper, NiO nanoparticles were successfully prepared in TritonX-100/n-hexanol/cyclohexane/water W/O microemulsion system using nickel chloride and ammonia water as raw materials． The effects of heat treatment on the morphology and size distribution of NiO nanoparticles were systematically investigated． Experimental Materials The chemicals used were nickel chloride (NiCl2•6H2O), ammonia (NH3•H2O), TritonX-100 (poly oxyethylene tert-octylphenyl ether), n-hexanol and cyclohexane. All chemicals were analyt
Data Loading...
