This brief proposes a solar-cell-assisted wireless biosensing system that operates using a biofuel cell (BFC). To facilitate BFC area reduction for the use of this system in area-constrained continuous glucose monitoring contact lenses, an energy harvester combined with an on-chip solar cell is introduced as a dedicated power source for the transmitter. A dual-oscillator-based supply voltage monitor is employed to convert the BFC output into digital codes. From measurements of the test chip fabricated in 65-nm CMOS technology, the proposed system can achieve 99% BFC area reduction.

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In this study, the enhancement of electrical conductivity and Oxidation Reduction Reaction (ORR) activity of tungsten carbide/carbon (WC/C) nanocomposite was successfully synthesized from palm oil by solution plasma process (SPP). For the synthesis, plasma fields with different frequency were applied the bipolar pulsed power supply connected with two tungsten electrodes. The properties of the synthesized WC/C nanocomposite were varied by using a different frequency. The electrical conductivity increased with the frequencies. The highest electrical conductivity was 4.27×10−2 S cm−1, which is higher than that of Ketjen Black (7.37 × 10−3 S cm−1). The WC/C nanocomposites were observed the surface area 160 m2 g−1, pore volume 0.53 cm3 g−1, average pore diameter 16.29 nm, basal plane crystallite size 18.0 nm, and the average compound granule diameter less than 100 nm. The cyclic voltammetry measurement was showed that the ORR activity of WC/C nanocomposites were obtained the good performance in alkaline solution for fuel cell application.

A solid-state CMOS-compatible glucose fuel cell was fabricated in an anode area using 1D structural carbon nanotubes (CNTs), which exhibits an open-circuit voltage (OCV) of 330 mV and a power density of 7.5 µW/cm 2 at a glucose concentration of 30 mM. The developed fuel cell was manufactured using a semiconductor (CMOS) fabrication process from materials biocompatible with the human body. The CNTs improved the fuel cell performance owing to their high electrocatalytic capability. We have introduced CNTs to the fabrication of a needletype CMOS-compatible glucose fuel cell. In this paper, we present a (17.5 × 0.7 mm 2) solidstate CMOS-compatible glucose fuel cell with an OCV of 330 mV at a glucose concentration of 30 mM, which is the highest OCV for a glucose fuel cell when the anode area is 4.86 mm 2 (16.2 × 0.3 mm 2). The highest power is 0.36 µW. Power generation is the main challenge in the fabrication of glucose fuel cells for biomedical applications.

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