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首页> 外文期刊>RSC Advances >Ultrasonication assisted fabrication of a tungsten sulfide/tungstite heterostructure for ppb-level ammonia detection at room temperature
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Ultrasonication assisted fabrication of a tungsten sulfide/tungstite heterostructure for ppb-level ammonia detection at room temperature

机译：超声波辅助在室温下进行PPB水平氨检测的硫化根硫化物/钨酸盐异质结构

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A heterostructure of WS _(2) /WO _(3) ·H _(2) O has been prepared by partial oxidation of WS _(2) nanosheets by exposing bulk WS _(2) micron powder to ultrasonic waves in a bath sonicator. The as-prepared nanomaterial was used as a sensing film in an interdigitated electrode-based gas detecting device. The device was found to be specific towards ammonia gas among a group oxidizing and reducing gases. In particular, a response of as high as 11.36–254.66% was recorded for ammonia concentrations of 50 ppb to 2 ppm with excellent repeatability and reproducibility at room temperature. The response time and recovery time of the device was found to be a few tens of seconds suggesting its practicability. A plausible mechanism based on different active sites present in the receptor film is proposed and a logical reason behind its specificity towards ammonia gas is also inferred based on the Lewis acidic centers on the nano-surfaces. Overall, this proposed nanomaterial has very high potential for practical use as a room temperature ammonia sensor.
机译：通过将散装Ws _（2）微米粉末暴露于浴缸中的超声波，通过部分氧化WS _（2）/ WO _（3）·（2）o的异质结构。 Sonicator。用作基于电极基的气体检测装置中的AS制备的纳米材料用作传感膜。发现该装置在氧化和还原气体中具有特异性朝向氨气。特别地，在室温下具有优异的重复性和再现性，记录高达11.36-254.66％的高达11.36-254.66％的响应。发现设备的响应时间和恢复时间是几十秒的速度，表明其实用性。提出了一种基于受体膜中存在的不同活性位点的合理机制，并基于纳米表面上的路易斯酸性中心推断出其对氨气的特异性背后的逻辑原因。总的来说，这种提出的纳米材料具有很高的实际用途作为室温氨传感器的潜力。

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