Organic bioelectronics, as sensors and actuators, provide unique functions when applied to biology and also humans, in the latter case targeting future health care. Here, a body area network is reported including organic sensor nodes, recording relevant health status parameters, and implantable actuators for delivery of pharmaceuticals. These are then included within electronic skin patches also comprising body-coupled communication protocols that transmit and receive information, via capacitive coupling, that is transported through the body. In a parallel communication pathway, sensor and actuator information is also collected into a Bluetooth-based unit for further transfer to cloud computing. While in the cloud, deep learning improve the sensor-to-actuator decision-making. Our complete system is the first in its kind, based on organic and Si-chip technology, performing sensory-regulated delivery of pharmaceuticals, supported by cloud connectivity and machine learning.
A terminal charge and capacitance model is developed for transient behavior simulation of electrolyte-gated organic field effect transistors (EGOFETs). Based on the Ward-Dutton partition scheme, the charge and capacitance model is derived from our drain current model reported previously. The transient drain current is expressed as the sum of the initial drain current and the charging current, which is written as the product of the partial differential of the terminal charges with respect to the terminal voltages and the differential of the terminal voltages upon time. The validity for this model is verified by experimental measurements.
A synthetic chemical strategy aimed at altering the cross-linking density of the electropolymerized conjugated polymer
polypyrrole has been devised and implemented. The actuation performance of the synthesized material was assessed
using a new type of apparatus capable of making rapid, non-contact dynamic measurements. The affect of cross-linking
on the actuation performance of polypyrroles, was investigated.
We will present organic electrochemical transistors that show both bi-stable and dynamic current modulation. In electrochemical devices, both ions and electrons are used as charge carriers. The device is all-organic and has been realized using common printing techniques, such as screen-printing. As the substrate, both cellulose-based paper and polyester foil have been used. PEDOT:PSS (poly(3,4-ethylenedioxythiophene):poly(styrene sulphonic acid)) is used as the conducting and electrochemical active material. PEDOT:PSS is switched between different redox states, corresponding to semi-conducting and conducting states. Operating voltages is below 2V and on/off ratios up to 105 have been reached (typical value is 5000). The operation of these devices does not depend on any critical dimensions; typical dimensions used are around 200 microns. With a certain geometrical design the dynamic transistor can be employed for frequency doubling. For the bi-stable transistor the modulation of the current is done by direct electronic contact, compared to the dynamic transistor that is modulated by induction of electrochemistry. The electrolyte in these devices can either be solidified or a liquid. The bi-stable device in combination with a layer of Nafion as electrolyte demonstrates humidity sensor functionality. Since substrates based on paper and common printing techniques can be used for fabrication, this give rise to an environmental friendly and non-expensive device setup.
Here, we report on devices based on patterned thin films of the conducting polymer system poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulphonic acid) (PEDOT:PSS) combined with patterns of solid electrolyte. The key device functionalities base on the updating of the RedOx state of PEDOT. This results in control of
the electronic properties of this conjugated polymer, i.e. the conductivity and optical properties are updated. Based on this we have achieved electric current rectifiers, transistors and display cells. Also, matrix addressed displays will be presented. Electrochemical switching is taking place when the oxidation and reduction potentials are overcome respectively. Therefore, these devices operate at voltage levels less then 2 Volts. Low voltage operation is achieved in devices not requiring any extremely narrow dimensions, as is the case for field effect driven devices. All devices reported can or has been made using standard printing techniques on flexible carriers.
Conference Committee Involvement (13)
Organic and Hybrid Sensors and Bioelectronics XIII
23 August 2020 | San Diego, California, United States
Organic and Hybrid Sensors and Bioelectronics XII
11 August 2019 | San Diego, California, United States
Organic and Hybrid Sensors and Bioelectronics XI
19 August 2018 | San Diego, California, United States
Organic Sensors and Bioelectronics X
6 August 2017 | San Diego, California, United States
Organic Sensors and Bioelectronics IX
28 August 2016 | San Diego, California, United States
Organic Sensors and Bioelectronics VIII
9 August 2015 | San Diego, California, United States
Organic Semiconductors in Sensors and Bioelectronics VII
19 August 2014 | San Diego, California, United States
Organic Semiconductors in Sensors and Bioelectronics VI
28 August 2013 | San Diego, California, United States
Organic Semiconductors in Sensors and Bioelectronics V
15 August 2012 | San Diego, California, United States
Organic Semiconductors in Sensors and Bioelectronics IV
24 August 2011 | San Diego, California, United States
Organic Semiconductors in Sensors and Bioelectronics III
4 August 2010 | San Diego, California, United States
Organic Semiconductors in Sensors and Bioelectronics II
5 August 2009 | San Diego, California, United States
Organic Semiconductors in Sensors and Bioelectronics
10 August 2008 | San Diego, California, United States