We report amperometric detection of formaldehyde (HCHO) using hydroxylamine hydrochloride and single-walled carbon nanotubes (SWCNTs). Hydroxylamine hydrochloride reacts with HCHO to emit HCl vapor, which injects a hole carrier into semiconducting SWCNTs. The increase of conductivity in SWCNTs is easily monitored using an ohmmeter. The debundling of SWCNTs with a metallo-supramolecular polymer (MSP) increased the active surface area in the SWCNTs network, leading to excellent sensitivity to HCHO with a limit of detection (LoD) of 0.016 ppm. The response of sensor is reversible, and the sensor is reusable. The selectivity to HCHO is 10⁵–10⁶ times higher than interferences with other volatiles such as water, methanol, and toluene. Moreover, false-positive responses caused by a significant variation of humidity and/or temperature are successfully discriminated from true-positive responses by using two sensors, one with and the other without hydroxylamine hydrochloride, in a referenced system.

中文翻译：

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使用单壁碳纳米管和羟胺对亚ppm甲醛进行安培检测：参考化学体系

我们报告使用盐酸羟胺和单壁碳纳米管（SWCNTs）对甲醛（HCHO）进行安培检测。盐酸羟胺与HCHO反应释放出HCl蒸气，从而将空穴载流子注入半导体SWCNT中。使用欧姆表可以轻松监控SWCNT中电导率的增加。SWCNT与金属超分子聚合物（MSP）的分离使SWCNTs网络中的活性表面积增加，从而导致对HCHO的出色灵敏度，检测限（LoD）为0.016 ppm。传感器的响应是可逆的，并且传感器是可重用的。对HCHO的选择性为10 ⁵ –10 ⁶比对其他挥发物（如水，甲醇和甲苯）的干扰高出三倍。此外，通过在参考系统中使用两个传感器，一个带有或不带有盐酸羟胺，成功地将由湿度和/或温度的显着变化引起的假阳性反应与真阳性反应区分开。