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论文类型：期刊论文

发表时间：2015-11-01

发表刊物：SENSORS AND ACTUATORS B-CHEMICAL

收录刊物：SCIE、EI、Scopus

卷号：219

页面范围：158-163

ISSN号：0925-4005

关键字：Hollow TiO(2)microspheres; Room-temperature chemoresistive gas sensors; Formaldehyde; UV illumination

摘要：Room temperature chemoresistive gas sensors could significantly decrease the demand of power consumption and are thus highly desirable in self-sustained nanosensors. Here we report that chemoresistive sensors fabricated from mesoporous hollow TiO2 microspheres show high sensitivity and selectivity to sub-ppm level of formaldehyde at room temperature with the assistance of low powered UV LED photon energy (2.5 mW). The sensor indicated excellent selectivity to other possible interferrents such as methanol, ethanol, acetone, ammonia and methylbenzene at low concentrations. These sensors have a much faster response (similar to 40 s)/recovery (similar to 50 s) characteristic, which significantly surpass the sensing properties shown by other types of nanostructured TiO2 reported in literature. (C) 2015 Elsevier B.V. All rights reserved.