Fully printed flexible and disposable wireless cyclic voltammetry tag

Abstract

A disposable cyclic voltammetry (CV) tag is printed on a plastic film by integrating wireless power transmitter, polarized triangle wave generator, electrochemical cell and signage through a scalable gravure printing method. By proximity of 13.56 MHz RF reader, the printed CV tag generates 320 mHz of triangular sweep wave from +500 mV to −500 mV which enable to scan a printed electrochemical cell in the CV tag. By simply dropping any specimen solution on the electrochemical cell in the CV tag, the presence of solutes in the solution can be detected and shown on the signage of the CV tag in five sec. 10 mM of N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) was used as a standard solute to prove the working concept of fully printed disposable wireless CV tag. Within five seconds, we can wirelessly diagnose the presence of TMPD in the solution using the CV tag in the proximity of the 13.56 MHz RF reader. This fully printed and wirelessly operated flexible CV tag is the first of its kind and marks the path for the utilization of inexpensive and disposable wireless electrochemical sensor systems for initial diagnose hazardous chemicals and biological molecules to improve public hygiene and health.

Monitoring of Vital Signs with Flexible and Wearable Medical Devices

“…Several fl exible rectennas have been developed [166][167][168][169] and used to power temperature, humidity, oxygen concentration, and chemical sensors. [170][171][172] To improve power density, rectennas have been integrated with other energy harvesting devices, including photovoltaics [ 142,173,174 ] and piezoelectrics, [ 175 ] and there is also the potential to transmit additional power to the antennas beyond what is available in the environment, for example using transmitters developed for RFID. Finally, a single antenna can perform multiple functions that are important for medical devices: receiving energy, transmitting excess energy to another device that is energy-starved, and sending and receiving data.…”

Fully Printed and Encapsulated SWCNT-Based Thin Film Transistors via a Combination of R2R Gravure and Inkjet Printing

“…In fact, the large surface roughness (∼10 nm) of the printed BTO dielectric likely plays a significant role in charge trap formation. 3,4,47 SWCNT TFTs have been shown to be highly sensitive to their surrounding environment with a chemical redox reaction involving adsorbed water leading to hysteresis and threshold voltage shifts in the transfer characteristics. 44,48 Thus, fabrication of TFTs that can serve as building blocks for printable circuits will require a strategy for encapsulation to minimize these effects.…”

“…The optimal PFDD/SWCNT ink formulation (50 mg L 47 via R2R printing were inkjet printed using the optimal SWCNT ink and deposition conditions on SiO 2 /Si substrates (50 mg L −1 , PFDD:SWCNT ratio of 6:1 at a drop spacing of 20 μm). The TFTs were then completed by inkjet printing source/drain contacts using silver nanoparticle ink.…”

Wearable and Fexible Sensor Sheets toward Periodic Health Monitoring

“…Although many printing methods (e.g., ink-jet printing [26], gravure printing [22,25], and flexographic printing [27,28]) have been developed, each printing technique has unique ink conditions, such as the viscosity of inks. The most suitable printing method depends on the ink condition, resolution of patterning, and throughput of the fabrication process.…”