Electrically Inspired Flexible Electrochemical Film Power Supply for Long-Term Epidermal Sensors

Abstract

This paper, for the first time, reports an electrically inspired flexible electrochemical film power supply for long-term epidermal sensors. This device can periodically provide electrical power for several hours after a short-time electrical activation. The electrical activation makes acetylcholine, which is infused into the subcutaneous tissue by iontophoresis. The interstitial fluid (ISF) with glucose molecules is then permeated autonomously for several hours. At this period, the device can provide electrical power. The electrical power is generated from the catalyzing reaction between the glucose oxidase immobilized on the anode and the permeated glucose molecules. After the ISF permeation stops, we give a short-time electrical activation to provide electrical power for several hours again. The power supply is flexible, which makes it adaptively conform to skin. The episodic short-time electrical activation can be enabled by an integrated small film lithium-ion battery. This method extends the service life of a lithium-ion battery 10-fold and suggests the application of small lithium-ion batteries for long-term epidermal sensors.

Capillary Force-Driven Quantitative Plasma Separation Method for Application of Whole Blood Detection Microfluidic Chip

“…Plasma separation methods are categorized into active and passive methods [9]. Active methods employ centrifugation [11,12], acoustic waves [13,14], electrophoresis [15,16], or magnetic [17] forces for rapid and pure plasma separation but require external power sources or specific substances [18]. In contrast, passive methods separate plasma using fluid dynamics or microstructures without the need for external power, enabling integration with portable microfluidic devices and reducing costs [19][20][21][22][23][24].…”

Editorial for the Special Issue on Physics in Micro/Nano Devices: From Fundamental to Application

“…Compared with the traditional silicon 3D electrode detectors, the full depletion voltage was greatly reduced, which showed high potential in photon science [ 10 ]. Zheng et al designed an electrically inspired flexible electrochemical film power supply for long-term epidermal sensors for the first time, which can periodically provide electrical power for several hours after a short-time electrical activation and the electrical activation can be enabled by an integrated small film lithium-ion battery, which extends the service life of a lithium-ion battery 10-fold and suggests the application of small lithium-ion batteries for long-term epidermal sensors [ 11 ]. Hua et al developed a fiber-based SPR biosensor decorated with DNA aptamers for the early diagnosis of cardiovascular disease.…”