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论文类型：期刊论文

发表时间：2018-03-01

发表刊物：SENSORS AND ACTUATORS B-CHEMICAL

收录刊物：SCIE、EI

卷号：256

页面范围：992-1000

ISSN号：0925-4005

关键字：WS2 nanoflakes; Light illumination; Triboelectrical nanogenerators; Ammonia sensors

摘要：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. (C) 2017 Elsevier B.V. All rights reserved.