期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 218, 期 -, 页码 73-77出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.04.092
关键词
Graphene quantum dots; Humidity sensors; Capillary condensation; Resistive device; Room temperature
资金
- Spanish MICINN
- Basque Government [1E11-304]
- project Hyper (Hybrid Neuroprosthetic and Neurorobotic Devices for Functional Compensation and Rehabilitation of Motor Disorders) under program Consolider-Ingenio
A room temperature graphene quantum dots (GQDs) based sensing material for relative humidity monitoring is presented. GQDs are synthesized by pyrolysis of citric acid and are deposited on a metallic interdigitated microelectrodes by drop-casting technology. GQDs are nanosheets around 20 nm in average lateral size and an average height of 2.7 +/- 0.9 nm. The response time is around few seconds and the sensitivity shows an exponential relation between 15 and 80% of RH, in resistive configuration device working at room temperature. The electrical changes as a function of the RH are related to the capillary condensation produced on the surface of the GQDs. Due to this physical behavior, a resistive path is formed between the microelectrodes and the condensed water vapor, and the resistivity of the system diminishes as the RH increases. A comparison on real time between the sensor developed and a commercial device corroborates the potential application of the novel sensor presented in this work. (C) 2015 Elsevier B.V. All rights reserved.
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