Séminaire Jeudi 6 Décembre 2018 à 11h - J. Daniel Prades - Ideas for low-power chemical sensors
Invitation : Sandrine Bernardini (Eq. MCI, Dep. DETECT)
Diffusion : IM2NP, CiNaM, Irphe, LP3, Madirel (via P. Boulet), PIIM (via T. Angot), CPT (T. Martin), Fédération de Chimie (via S. Viel)
SEMINAIRE Jeudi 6 Décembre 2018 à 11h
Salle des séminaires de l'Im2np, campus de Saint-Jérôme, aile 1, niveau 6 service 161
J. Daniel Prades
Departament d’Enginyeria Electrònica i Biomèdica, Universitat de Barcelona, 08028 Barcelona ; Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, 08028, Barcelona
Ideas for low-power chemical sensors
Our research of the last 10 years has been focused on the implementation of new approaches to reduce power consumption in conductometric, solid-state, gas sensors. In this presentation we will review our main contributions in the context of the state-of-the-art.
First, we will show how power consumption in semiconductor devices can be lowered to just a few microwatts by means of the self-heating effect occurring in nanomaterials [1]. Only a decade ago, this principle was proved with fully hand-made devices [2]. Today, it is possible to achieve comparable efficiencies with devices produced in mass scale, using widely spread micro and nanofabrication techniques.
Second, we will move to light activated chemical sensors [3], where dramatic power savings can be achieved by combining the power efficiency of light emitting diodes (LED) with aggressive miniaturization efforts. Using industry standard technologies, it is possible to offer sub-milliwatt power demands in monolithic integrated microLED devices that can be produced in large amounts (so-called Micro Light Plates). We will also show how optical activation opens the door to complementary operation approaches, based on light energy harvesting that can enable virtually zero-power devices in the near future [4].
References
1. Fàbrega, C.; Casals, O.; Hernández-Ramírez, F.; Prades, J. D. A review on efficient self-heating in nanowire sensors: Prospects for very-low power devices. Sensors Actuators, B Chem. 2017, 256, 797–811, doi:10.1016/j.snb.2017.10.003.
2. Prades, J. D.; Jimenez-Diaz, R.; Hernandez-Ramirez, F.; Barth, S.; Cirera, A.; Romano-Rodriguez, A.; Mathur, S.; Morante, J. R. Ultralow power consumption gas sensors based on self-heated individual nanowires. Appl. Phys. Lett. 2008, 93, 123110, doi:10.1063/1.2988265.
3. Prades, J. D.; Jimenez-Diaz, R.; Manzanares, M.; Hernandez-Ramirez, F.; Cirera, A.; Romano-Rodriguez, A.; Mathur, S.; Morante, J. R. A model for the response towards oxidizing gases of photoactivated sensors based on individual SnO2nanowires. Phys. Chem. Chem. Phys. 2009, 11, 10881–10889, doi:10.1039/b915646a.
4. Hoffmann, M. W. G.; Gad, A. E.; Prades, J. D.; Hernandez-Ramirez, F.; Fiz, R.; Shen, H.; Mathur, S. Solar diode sensor: Sensing mechanism and applications. Nano Energy 2013, 2, 514–522.
Corresponding author
J. Daniel Prades, Martí i Franquès 1, Pl.2, Of.209, 08028 Barcelona. +34 934039159, dprades@el.ub.edu
