Fig. 6.

Oxygen electrochemical detection techniques. (A) Schematic diagram of the implantable oxygen sensor (B) low temperature co-fired ceramic sensor for measuring oxygen in a flowing environment [46]. (a) Conceptual design of the microchannels with the reaction mechanism happening at the electrodes. (b) The assembly and fabrication process of the sensor with an assembled version in (c) [47]. (C) A skin like oxygen sensor based on gold electrodes patterned in a horseshoe structure to enhance the mechanical properties and integrated onto a medical bandage [48]. (D) Thread-based electrochemical oxygen sensor for area and local measurements, showing the flexibility of the sensor wrapped around human finger [49].

(Reproduced from Refs. [[46], [47], [48], [49]], with permissions from Royal Society of Chemistry and Elsevier).

(For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)