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Phosphomolybdic Acid-Decorated Carbon Nanotubes for Low-Power Sensing of NH3 and NO2 at Room Temperature
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-02-16 , DOI: 10.1021/acsanm.0c03333 Yu Zhu 1 , Changsheng Chen 1 , Shuo Wu 1 , Runhong Cheng 1 , Junxiong Gao 1 , Yan Yu 1 , Wenli Zhou 1, 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-02-16 , DOI: 10.1021/acsanm.0c03333 Yu Zhu 1 , Changsheng Chen 1 , Shuo Wu 1 , Runhong Cheng 1 , Junxiong Gao 1 , Yan Yu 1 , Wenli Zhou 1, 2
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Low-dimensional materials such as carbon nanotubes (CNTs) are promising candidates for gas sensing. Surface modification with specific molecules is considered an effective approach to enhance gas sensing. In this work, a kind of carbon hybrid is fabricated with phosphomolybdic acid (PMA) molecule-decorated single-walled CNTs (SWNTs) as a gas-sensing element and chemical vapor deposition-grown graphical graphene on prepatterned copper and nickel films as composite electrodes. According to the experimental results of NH3 and NO2 detection, the PMA-decorated carbon hybrids present much higher sensitivity, faster response, and lower power consumption than other previously reported oxide-modified CNT gas sensors. Responses of the DC resistance variation of approximately 23 or −21% to 5 ppm NH3 or NO2 are demonstrated at room temperature, with a power consumption of only hundreds of nanowatts (nWs). The enhanced gas sensitivity of the carbon hybrid is described by the first-principles calculation of the energy band and Schottky barrier in hybrid structures from the interface perspective. A significant change in Fermi level in SWNTs due to PMA decoration reduces the Schottky barrier at the SWNT/graphene interface and allows the hybrid to function at an appropriate status, which corresponds to a high response to the redox reaction between PMA and NO2 or NH3 molecules.
中文翻译：
磷钼酸修饰的碳纳米管，用于在室温下低功率感测NH 3和NO 2
诸如碳纳米管（CNT）的低维材料是有希望用于气体传感的候选材料。用特定分子进行表面改性被认为是增强气体感测的有效方法。在这项工作中，用磷钼酸（PMA）分子修饰的单壁碳纳米管（SWNTs）作为气体传感元件，并在预先形成图案的铜和镍膜上将化学气相沉积生长的图形石墨烯用作复合电极，制备了一种碳杂化物。 。根据NH 3和NO 2的实验结果检测，与以前报道的其他氧化物修饰的CNT气体传感器相比，用PMA装饰的碳杂化物具有更高的灵敏度，更快的响应和更低的功耗。直流电阻变化对5 ppm NH 3或NO 2的大约23％或-21％的响应在室温下进行了演示，功耗仅为数百纳瓦（nWs）。从界面的角度，通过混合结构中能带和肖特基势垒的第一性原理计算，可以描述碳混合材料增强的气体敏感性。由于PMA修饰，SWNT中费米能级的显着变化降低了SWNT /石墨烯界面的肖特基势垒，并使杂化体在适当的状态下起作用，这对应于对PMA与NO 2或NH之间的氧化还原反应的高响应3个分子。
更新日期：2021-02-26
中文翻译：
磷钼酸修饰的碳纳米管，用于在室温下低功率感测NH 3和NO 2
诸如碳纳米管（CNT）的低维材料是有希望用于气体传感的候选材料。用特定分子进行表面改性被认为是增强气体感测的有效方法。在这项工作中，用磷钼酸（PMA）分子修饰的单壁碳纳米管（SWNTs）作为气体传感元件，并在预先形成图案的铜和镍膜上将化学气相沉积生长的图形石墨烯用作复合电极，制备了一种碳杂化物。 。根据NH 3和NO 2的实验结果检测，与以前报道的其他氧化物修饰的CNT气体传感器相比，用PMA装饰的碳杂化物具有更高的灵敏度，更快的响应和更低的功耗。直流电阻变化对5 ppm NH 3或NO 2的大约23％或-21％的响应在室温下进行了演示，功耗仅为数百纳瓦（nWs）。从界面的角度，通过混合结构中能带和肖特基势垒的第一性原理计算，可以描述碳混合材料增强的气体敏感性。由于PMA修饰，SWNT中费米能级的显着变化降低了SWNT /石墨烯界面的肖特基势垒，并使杂化体在适当的状态下起作用，这对应于对PMA与NO 2或NH之间的氧化还原反应的高响应3个分子。
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