2026-04-29T15:59:22Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/110622025-11-15T01:05:27Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

Graphene quantum dots as a novel sensing material for low-cost resistive and fast-response humidity sensors Ruiz Fernández, Virginia Fernández, Iván Carrasco, Pedro Mª Cabañero, Germán Grande, Hans J. Herrán, Jaime Graphene quantum dots Humidity sensors Capillary condensation Resistive device Room temperature 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. 2025-11-14T12:00:20Z 2025-11-14T12:00:20Z 2025-11-14T12:00:20Z 2015-10 info:eu-repo/semantics/article 0925-4005 https://hdl.handle.net/10259/11062 10.1016/j.snb.2015.04.092 eng Sensors and Actuators B: Chemical. 2015, V. 218, p. 73-77 https://doi.org/10.1016/j.snb.2015.04.092 http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier