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首页> 外文期刊>Microelectronic Engineering >Hydrothermal synthesis of K_2W_4O_(13) nanowire with high H_2S gas sensitivity
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Hydrothermal synthesis of K_2W_4O_(13) nanowire with high H_2S gas sensitivity

机译：水热合成高H_2S气敏性的K_2W_4O_（13）纳米线

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摘要

Single crystalline, hexagonal K_2W_4O_(13) nanowire was synthesized by hydrothermal treatment of WO_3•0.33H_2O precursor which was synthesized by precipitation reaction of the tungstate salt and hydrochloric acid. The hydrothermal reaction was performed under static condition at 180 ℃ in the presence of K_2SO_4 employed as the crystal growth-directing agent. XRD and TEM analysis revealed well crystalline K_2W_4O_(13) nanowires with the average diameter of 11.7 ± 3.5 nm and the length up to several hundreds nanometers. The K_2W_4O_(13) nanowires were stable up to 400 ℃ and transformed to K_2W_7O_(22) after annealing at 500 ℃. Without the K_2SO_4, only irregular platelet particle of WO_3•0.33H_2O with the primary size of ～20-50 nm was obtained. Crystallization of the nanowires took place after 30 min of hydrothermal treatment. Thick-film K_2W_4O_(13) nanowire sensor was tested for sensing performance towards 0.3-10 ppm H_2S, 0.2-10 ppm NO_2, 20-1000 ppm SO_2 and 20-1000 ppm CO. The result revealed that the sensor was most sensitive to H_2S followed by NO_2 at the optimum operating temperature of 300 and 350 ℃, respectively, and insensitive to SO_2 and CO, indicating its high selectivity to both H_2S and NO_2. In addition, the sensor exhibited high linearity.
机译：通过对钨酸盐与盐酸的沉淀反应合成WO_3·0.33H_2O前驱体进行水热处理，合成了单晶六角形的K_2W_4O_（13）纳米线。在K_2SO_4作为晶体生长导向剂的存在下，在静态条件下于180℃进行水热反应。 XRD和TEM分析表明，晶体良好的K_2W_4O_（13）纳米线的平均直径为11.7±3.5 nm，长度可达几百纳米。 K_2W_4O_（13）纳米线在400℃以下稳定，在500℃退火后转变为K_2W_7O_（22）。没有K_2SO_4，只能得到初级粒径为约20-50 nm的不规则血小板WO_3•0.33H_2O。纳米线的结晶在水热处理30分钟后发生。测试了厚膜K_2W_4O_（13）纳米线传感器对0.3-10 ppm H_2S，0.2-10 ppm NO_2、20-1000 ppm SO_2和20-1000 ppm CO的感测性能。结果表明，该传感器对H_2S最敏感其次是在最佳工作温度分别为300和350℃的NO_2，并且对SO_2和CO不敏感，表明其对H_2S和NO_2的选择性很高。另外，该传感器表现出高线性度。

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  • 来源
    《Microelectronic Engineering》 |2014年第8期|88-92|共5页
  • 作者

    Sitthisuntorn Supothina; Mantana Suwan; Anurat Wisitsoraat;

  • 作者单位

    National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Rd., Klong Luang, Pathumthani 12120, Thailand;

    National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Rd., Klong Luang, Pathumthani 12120, Thailand;

    National Electronics and Computer Technology Center, 112 Thailand Science Park, Paholyothin Rd., Klong Luang, Pathumthani 12120, Thailand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Potassium tungsten oxide; Nanowire; Hydrothermal; Hydrogen sulfide; Gas sensor;

    机译：氧化钨钾;纳米线;水热硫化氢;气体传感器;

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