| Title | CdS quantum dots supported by ultrathin porous nanosheets assembled into hollowed-out Co3O4 microspheres: A room-temperature H2S gas sensor with ultra-fast response and recovery |
| Authors | 黄新堂 |
| Issue Date | 2019 |
| Publisher | Sensors & Actuators B: Chemical. Nov2019, Vol. 298, pN.PAG-N.PAG. 1p. |
| Keywords | CdS quantum dots H2S gas sensor High response Hollowed-out Co3O4 microspheres Room-temperature Ultra-fast response/recovery |
| Abstract | Unique CdS quantum dots (˜4.5 nm) supported by ultrathin porous nanosheets assembled into hollowed-out Co 3 O 4 microspheres is successfully synthesized via a simple and energy-efficient room temperature in situ growth strategy. • This work explored an efficient method to fabricate room-temperature gas sensors with a high response and ultrafast response/recovery rates by integrating quantum dots with hollowed-out nanostructures, the resulting sensors overcame the temperature issues of gas sensors and realized reproducible room-temperature gas sensing capabilities. • The gas sensor based on CdS QDs/Co 3 O 4 HMSs exhibits a high response and ultra-fast response/recovery speed at room temperature when detecting H 2 S (the response and response/recovery times of the gas sensor to 100 ppm H 2 S at room temperature are 12.7 and 0.6/1.0 s, respectively). With the urgent need to improve societal security, semiconductor-based gas sensors have received substantial attention for their efficiency and accuracy in the detection of harmful gases. However, challenging existed to develop sensors that exhibit both high response and rapid response/recovery rates at room temperature. Herein, we present a simple and energy-efficient room-temperature in situ growth strategy to prepare CdS quantum dots supported by ultrathin porous nanosheets assembled into hollowed-out Co 3 O 4 microspheres (CdS QD/Co 3 O 4 HMSs). XRD, EDX, BET, SEM, TEM and HRTEM analysis confirmed that the interconnected CdS QDs (˜4.5 nm) were well dispersed on the ultrathin porous nanosheet of Co 3 O 4 HMSs. The fabricated CdS QD/Co 3 O 4 HMS sensor exhibited high response (12.7) and ultra-fast response/recovery rates (0.6/1.0 s) to 100 ppm H 2 S at 25 °C, which is ascribed to high active quantum dots and hollowed-out nanostructure. In addition, the sensor exhibited a low detection limit (1–5 ppm), good reversibility and exceptional long-term stability. This work explores an efficient way to fabricate high-response and ultra-fast response/recovery room-temperature gas sensors by integrating quantum dots with hollowed-out nanostructures. [ABSTRACT FROM AUTHOR] Copyright of Sensors & Actuators B: Chemical is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
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