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以硝酸钴为氧化剂,乙二醇为燃料,采用溶液燃烧法在200～400℃合成了纳米CoO晶体。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、低温N2吸附等手段对产物的晶相结构、形貌和比表面积进行了表征,系统地研究了不同燃料比和燃烧温度对合成产物的影响。结果发现:乙二醇燃料缺50%时制备得到纳米Co3O4,化学计量比量燃料时得到CoO,而燃料过量50%时则得到CoO和金属Co的混晶。通过选取化学计量比量的乙二醇,燃烧温度300～400℃的反应条件,可以控制合成出多孔网状结构的纯相纳米CoO晶体,晶粒大小约为17 nm,BET比表面积7.7 m2·g-1。
Using cobalt nitrate as oxidant and ethylene glycol as fuel, nanocrystalline CoO crystals were synthesized by solution combustion at 200 ~ 400 ℃. The crystal structure, morphology and specific surface area of the product were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and low temperature N2 adsorption. The effects of different fuel ratios and combustion temperatures on the synthesis of Impact. The results showed that nano-Co3O4 was prepared when 50% of ethylene glycol fuel was lacking and CoO was obtained when the stoichiometric amount of fuel was obtained, while the mixed crystal of CoO and metal Co was obtained when the amount of fuel was over 50%. By selecting the ethylene glycol with stoichiometric ratio and the reaction temperature of 300 ~ 400 ℃, pure nanocrystalline CoO crystals with porous network structure can be controlled. The crystal size is about 17 nm and the BET specific surface is 7.7 m2 · g-1.