采用水热法,用氨水调节溶液pH,合成了纺锤及花状的ZnO。利用X射线衍射仪、扫描电子显微镜对不同pH下合成的ZnO的物相及形貌进行了表征,并采用静态配气法测试了其对三乙胺的气敏性能。结果表明,不同pH制备了不同形貌的ZnO材料。pH=9时制备的纺锤形ZnO对三乙胺的灵敏度最高,在340℃的最佳工作温度下对100mg/L三乙胺气体的灵敏度高达90.0,呈现出良好的选择性。并且元件具有较好的响应-恢复特性,响应时间为27s,恢复时间仅需3s。
The spindle and flower like ZnO were synthesized by hydrothermal method with ammonia solution adjusting pH.The phase and morphology of ZnO synthesized at different pH values were characterized by XRD and SEM.The gas-sensing properties of ZnO to triethylamine were tested by static volumetric method.The results showed that ZnO materials with different morphologies were synthesized at different pH values.The spindle-like ZnO synthesized at pH 9 exhibited the highest sensitivity and selectivity to triethylamine,and the sensitivity to the triethylamine gas of 100mg/L reached 90.0 at the optimum operating temperature of 340℃.Furthermore the sensor showed excellent response and recovery characteristic.The response time was 27s and the recovery time was only 3s.
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基金资助
山东省自然科学基金(ZR2015BL031);滨州学院科研基金项目(BZXYG1601)
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