WO3纳米棒/石墨烯复合材料的制备及其气敏性能研究
Synthesis and gas-sensing properties of WO3 nanorods/graphene composites
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摘要: 以钨酸钠和盐酸为原料、草酸和硫酸钠为辅助剂,采用水热法制备纯WO3,进一步掺杂氧化石墨烯(GO)制备WO3纳米棒/石墨烯复合材料.通过XRD,FE-SEM,RAMAN,FTIR等手段对不同GO掺杂量的WO3纳米棒/石墨烯复合材料进行表征,并采用静态配气法对该材料进行气敏性能测试.结果表明,纯WO3为单斜晶相,WO3纳米棒/石墨烯复合材料为四方晶相,且随着GO掺杂量的增加,纳米棒的长径比逐渐增大;当GO掺杂量为1.0 wt%时,复合材料的气敏性能较好,加热电压为2.96 V(约155℃),对5×10-6 H2的灵敏度达1.779,响应和恢复时间分别为3 s和4 s.
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关键词:
- WO3纳米棒/石墨烯复合材料 /
- 水热法 /
- 气敏性能
Abstract: Using sodium tungstate and hydrochloric acid as raw materials, oxalic acid and sodium sulfate as auxiliary agents, WO3 nanorods/graphene composites had been synthesized by hydrothermal method. The as-synthesized samples were characterized by XRD, FE-SEM, RAMAN and FTIR. Gas-sensing characteristics of the materials had been tested by static state method. The results illustrated that the as-synthesized pure WO3 had monoclinic phase and the WO3/graphenenanomaterial had tetragonal phase. The length-diameter ratio of the materials increased when the amounts of graphene oxide (GO) increased, and the 1.0 wt% WO3/graphenenanocomposite had a good gas-sensing property. Its sensitivity could reach 1.779 of 5×10-6 H2 at 2.96 V working voltage(about 155℃). And this time, the response and recovery time was 3 s and 4 s, respectively.-
Key words:
- WO3 nanorods/graphene composite /
- hydrothermal /
- gas-sensing performance
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