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Francisco Palacio
University of Barcelona
Radio-frequency identificationElectronic engineeringPotentiostatIndium tin oxideDielectric spectroscopy
16Publications
5H-index
534Citations
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Publications 16
Newest
#1Francisco Palacio (University of Barcelona)H-Index: 5
#2Jordi Fonollosa (UPC: Polytechnic University of Catalonia)H-Index: 15
Last. Santiago Marco (University of Barcelona)H-Index: 29
view all 5 authors...
Metal Oxide (MOX) gas sensors rely on chemical reactions that occur efficiently at high temperatures, resulting in too-demanding power requirements for certain applications. Operating the sensor under a Pulsed-Temperature Operation (PTO), by which the sensor heater is switched ON and OFF periodically, is a common practice to reduce the power consumption. However, the sensor performance is degraded as the OFF periods become larger. Other research works studied, generally, PTO schemes applying wav...
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#1Raquel PrunaH-Index: 4
#2Francisco PalacioH-Index: 5
Last. Manuel LopezH-Index: 17
view all 6 authors...
A novel transparent and nanostructured ion-sensitive electrode based on indium tin oxide (ITO) coated with cobaltbis(dicarbollide)-doped poly(pyrrole) (PPy) is presented in this work. This metallacarborane-doped PPy was used as conducting polymer due to its high stability and chemical resistance. The ion-sensitive electrode was coupled to a miniaturized and low-cost potentiostat, in a final autonomous kit for potentiometric determination of pH. Qualitative calibration of the system revealed Nern...
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#1Raquel Pruna (University of Barcelona)H-Index: 4
#2Francisco Palacio (University of Barcelona)H-Index: 5
Last. Manel López (University of Barcelona)H-Index: 13
view all 8 authors...
Abstract Miniaturizing potentiostats, keeping their cost low and yet preserving full measurement characteristics (e.g. bandwidth, determination of capacitive/inductive contribution to sensor's impedance and parallel screening) is still an unresolved challenge in bioelectronics. In this work, the combination of simple analogue circuitry together with powerful microcontrollers and a digital filter implementation is presented as an alternative to complex and incomplete architectures reported in the...
14 CitationsSource
#1Raquel PrunaH-Index: 4
#2Francisco PalacioH-Index: 5
Last. Manel LópezH-Index: 13
view all 6 authors...
The development of miniaturized potentiostats capable of measuring in a wide range of conditions and with full characteristics (e.g., wide bandwidth and capacitive/inductive contribution to sensor’s impedance) is still an unresolved challenge in bioelectronics. We present a simple analogue design coupled to a digital filter based on a lock-in amplifier as an alternative to complex architectures reported hitherto. A low-cost, miniaturized and fully integrated acquisition electronic system was dev...
1 CitationsSource
#1Raquel PrunaH-Index: 4
#2Francisco PalacioH-Index: 5
Last. Manel LópezH-Index: 13
view all 3 authors...
The need for miniaturized, low-cost and ultrasensitive electrochemical sensors has motivated the search and study of new nanostructured materials. We propose nanostructured indium tin oxide (ITO) electrodes as a promising platform due to their good electrical conductivity, transparency to visible wavelengths and high surface-to-volume ratio. The nanostructured electrodes were fabricated by electron beam evaporation, and electrochemical techniques were used to quantify more than a 40% increase in...
2 CitationsSource
#1Francisco PalacioH-Index: 5
Last. Santiago MarcoH-Index: 29
view all 8 authors...
Most of the battery powered systems with integrated sensors need low power consumption modes to enlarge the operation time. In the case of the fruit logistic chain, the fruit quality may be controlled by the detection of some gases as ethylene, acetaldehyde and ammonia, that are related to maturation, oxygen stress and refrigeration leakage. We report the integration of an ultra-low power (ULP) metal oxide (MOX) sensor array inside a Radio Frequency IDentification (RFID) 13.56 MHz ISO/IEC 15693 ...
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#1Raquel Pruna (University of Barcelona)H-Index: 4
#2Francisco Palacio (University of Barcelona)H-Index: 5
Last. Manel López (University of Barcelona)H-Index: 13
view all 7 authors...
Fabrication and organosilane-functionalization and characterization of nanostructured ITO electrodes are reported. Nanostructured ITO electrodes were obtained by electron beam evaporation, and a subsequent annealing treatment was selectively performed to modify their crystalline state. An increase in geometrical surface area in comparison with thin-film electrodes area was observed by atomic force microscopy, implying higher electroactive surface area for nanostructured ITO electrodes and thus h...
8 CitationsSource
#1Raquel PrunaH-Index: 4
#2Francisco PalacioH-Index: 5
Last. Manel LópezH-Index: 13
view all 7 authors...
Source
#1Raquel Pruna (University of Barcelona)H-Index: 4
#2Francisco Palacio (University of Barcelona)H-Index: 5
Last. B. Garrido (University of Barcelona)H-Index: 29
view all 8 authors...
The electroactivity of nanostructured indium tin oxide (ITO) has been investigated for its further use in applications such as sensing biological compounds by the analysis of redox active molecules. ITO films were fabricated by using electron beam evaporation at different substrate temperatures and subsequently annealed for promoting their crystallization. The morphology of the deposited material was monitored by scanning electron microscopy, confirming the deposition of either thin films or nan...
4 CitationsSource
#1Francisco Palacio (University of Barcelona)H-Index: 5
#2Joan Daniel Prades (University of Barcelona)H-Index: 30
Last. Manel López (University of Barcelona)H-Index: 13
view all 6 authors...
Abstract We describe a low power, easy to use and portable device for measuring the electrochemical impedance of different types of biosensors. The measurement technique is based on the direct synthesis of sinusoidal signals followed by a discrete time Fourier transform analysis, carried out by an integrated electronic stage that excites and collects the response from the sample. This kind of technique provides very good signal to noise ratio, high sensibility to small variations in the sensor i...
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