2026-04-29T15:59:16Zhttps://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 Química analítica Ciencia de materiales Chemistry, Analytic Materials science 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. Financial support from the Spanish MICINN (V.R. Ramón y Cajal Program), the Basque Government (Etortek Program, nanoIKER project IE11-304) and the project Hyper (Hybrid Neuroprosthetic and Neurorobotic Devices for Functional Compensation and Rehabilitation of Motor Disorders) under program Consolider-Ingenio 2010–2014, is gratefully acknowledged. 2025-11-14T12:00:20Z 2025-11-14T12:00:20Z 2015-10 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 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 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess application/pdf Elsevier https://riubu.ubu.es/bitstream/10259/11062/4/Ruiz-sabc_2015.pdf.jpg Hispana TEXT http://creativecommons.org/licenses/by-nc-nd/4.0/ RIUBU. Repositorio Institucional de la Universidad de Burgos https://hdl.handle.net/10259/11062