Soft wearable electronics for underwater applications are of interest, but depend on the development of a waterproof, long-term sustainable power source. In this work, we report a bionic stretchable nanogenerator for underwater energy harvesting that mimics the structure of ion channels on the cytomembrane of electrocyte in an electric eel. Combining the effects of triboelectrification caused by flowing liquid and principles of electrostatic induction, the bionic stretchable nanogenerator can harvest mechanical energy from human motion underwater and output an open-circuit voltage over 10 V. Underwater applications of a bionic stretchable nanogenerator have also been demonstrated, such as human body multi-position motion monitoring and an undersea rescue system. The advantages of excellent flexibility, stretchability, outstanding tensile fatigue resistance (over 50,000 times) and underwater performance make the bionic stretchable nanogenerator a promising sustainable power source for the soft wearable electronics used underwater.

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A bionic stretchable nanogenerator for underwater sensing and energy harvesting.

More than energy harvesting – Combining triboelectric nanogenerator and flexible electronics technology for enabling novel micro-/nano-systems

Graphene-based wearable piezoresistive physical sensors

This expanded and thoroughly revised edition of Thomas H. Lee's acclaimed guide to the design of gigahertz RF integrated circuits features a completely new chapter on the principles of wireless systems. The chapters on low-noise amplifiers, oscillators and phase noise have been significantly expanded as well. The chapter on architectures now contains several examples of complete chip designs that bring together all the various theoretical and practical elements involved in producing a prototype chip. First Edition Hb (1998): 0-521-63061-4 First Edition Pb (1998); 0-521-63922-0

The Design of CMOS Radio-Frequency Integrated Circuits: RF CIRCUITS THROUGH THE AGES

Self-powered electronic skin based on the triboelectric generator

The invention discloses a rotary friction power generation device for outputting a unidirectional current, comprising at least one power generation unit, wherein the power generation unit comprises afirst friction body and a second friction body; a first friction body comprising 2N first sub-friction bodies and a second friction body comprising N second sub-friction bodies, wherein each of the first and second ends of the second sub-friction bodies is provided with a conductive member, wherein N is a positive integer greater than or equal to 1; When the first friction body slides unidirectionally with respect to the second friction body, inductive charges are generated on the first sub-friction body and the second sub-friction body, and an electric field is also generated between the first sub-friction bodies, and the inductive charges on the first sub-friction body are driven to move unidirectionally through the conductive member to generate a unidirectional current; as that power generation mode of the independent layer is adopt, the conductive layer does not need to be separately arrange; and in the power generation process without the assistance of other electronic devices, can directly, real-time output unidirectional current, can supply power to the load.

A rotating friction power generation device for outputting a unidirectional current

The new approach of silicon based phononic crystal with drilling across its two sides is proposed to control the acoustic waves. A very large band gap is obtained by one dimensional 1D and two dimensional 2D drilled phononic crystal in desired frequency ranges. When these novel phononic crystals is employed to proposed centered hole thin film piezoelectric disc resonator the anchor loss reduced and quality factor $Q$ improved from 92100 to 127 billion at operating frequency 178.07MHz, and low vibrational displacement is obtained based on Finite Element Analysis simulation. It is observed that this novel PnC improve the quality of resonator with better performance.

Quality Enhancement of Centered Hole Thin Film Disc Resonator by Drilled Phononic crystals

Analysis of high electromechanical coupling coefficient zinc oxide Lame’ mode resonators and a design technique for spurious mode mitigation

This paper describes comparative study of traditional and broadband piston mode (BPM) designs applied to A 1 -mode resonators on lithium niobate. These two piston mode designs are applied of the A 1 -mode resonator, and achievable performances are compared. The result indicates that BPM design is superior to the traditional one.

Comparative Study of Traditional and Broadband Piston Mode Designs of A1-Mode Resonators on Lithium Niobate

In this paper, an equivalent- circuit model of MAM (metal-air-metal) capacitor applied in RF MEMS devices is proposed. Also, equivalent-circuit model of distributed MEMS phase shifter with MAM capacitor are presented. The parametric analysis of the proposed models and the designing method are also presented. By adopting the unit cell (0/11.25°) of 5-bit X-band distributed phase shifter, the paper discusses the model error and the efficiency of the proposed equivalent-circuit model. Compared with existing equivalent-circuit model, as for S 11 , the model error of the proposed equivalent-circuit model could be less than 1dB, decreased by about ten times, and the model error for phase shift per unit cell could be less than 0.5°, decreased by about thirteen times.

Jingfu Bao

Papers

A rotating friction power generation device for outputting a unidirectional current

Quality Enhancement of Centered Hole Thin Film Disc Resonator by Drilled Phononic crystals

Analysis of high electromechanical coupling coefficient zinc oxide Lame’ mode resonators and a design technique for spurious mode mitigation

Comparative Study of Traditional and Broadband Piston Mode Designs of A1-Mode Resonators on Lithium Niobate

Modeling and analysis of distributed MEMS phase shifter with metal-air-metal capacitor