Light enhanced VOCs sensing of WS2 microflakes based chemiresistive sensors powered by triboelectronic nanogeneratorsстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 4 января 2018 г.

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[1] Light enhanced vocs sensing of ws2 microflakes based chemiresistive sensors powered by triboelectronic nanogenerators / D. Gu, L. X, H. Wang et al. // Sensors and Actuators, B: Chemical. — 2018. — Vol. 256. — P. 992–1000. The triboelectrical nanogenerators (TENGs)-powered light enhanced gas sensor has been successfully developed for detection of ammonia by using WS2 microflakes as the chemiresistive sensing material. The layered WS2 microflakes based chemiresistive gas sensor under the light illumination exhibits much improved sensitivity and selectivity to NH3 at low temperature than that in the dark. Within the light wavelengths range from visible to UV, the UV and near infrared light at 940 nm are more effective in enhancing the sensitivities of the sensor to ammonia. The light enhanced sensing mechanism of the WS2 gas sensor could be attributed to the electrons transfers from the NH3 molecules to WS2 and the amount of photo-induced oxygen ions at the activated surface of the WS2 microflakes. Furthermore, the triboelectronic nangenerator using nanosized NaNbO3-incorporated PDMS as the tribo layers was designed and fabricated to yield the pulsed electricity for powering the lights. Interestingly, the results demonstrated for the first time that the generated pulsed power could completely replace the direct current (DC) power supply for the light in enhancing the response of the chemical sensor. Thus, it indicates a significant potential to replace the battery for powering a light-activated chemical gas sensor at low or even room temperatures. [ DOI ]

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