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      Hierarchically patterned self-powered sensors for multifunctional tactile sensing

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          Abstract

          A multifunctional self-powered sensor is developed for pressure, temperature, and material sensing.

          Abstract

          Flexible sensors are highly desirable for tactile sensing and wearable devices. Previous researches of smart elements have focused on flexible pressure or temperature sensors. However, realizing material identification remains a challenge. Here, we report a multifunctional sensor composed of hydrophobic films and graphene/polydimethylsiloxane sponges. By engineering and optimizing sponges, the fabricated sensor exhibits a high-pressure sensitivity of >15.22 per kilopascal, a fast response time of <74 millisecond, and a high stability over >3000 cycles. In the case of temperature stimulus, the sensor exhibits a temperature-sensing resolution of 1 kelvin via the thermoelectric effect. The sensor can generate output voltage signals after physical contact with different flat materials based on contact-induced electrification. The corresponding signals can be, in turn, used to infer material properties. This multifunctional sensor is excellent in its low cost and material identification, which provides a design concept for meeting the challenges in functional electronics.

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          Most cited references32

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          Progress in triboelectric nanogenerators as a new energy technology and self-powered sensors

          A review on the principles, novel applications and perspectives of triboelectric nanogenerators as power sources and as self-powered sensors.
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            Coding and use of tactile signals from the fingertips in object manipulation tasks.

            During object manipulation tasks, the brain selects and implements action-phase controllers that use sensory predictions and afferent signals to tailor motor output to the physical properties of the objects involved. Analysis of signals in tactile afferent neurons and central processes in humans reveals how contact events are encoded and used to monitor and update task performance.
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              Quantifying the triboelectric series

              Triboelectrification is a well-known phenomenon that commonly occurs in nature and in our lives at any time and any place. Although each and every material exhibits triboelectrification, its quantification has not been standardized. A triboelectric series has been qualitatively ranked with regards to triboelectric polarization. Here, we introduce a universal standard method to quantify the triboelectric series for a wide range of polymers, establishing quantitative triboelectrification as a fundamental materials property. By measuring the tested materials with a liquid metal in an environment under well-defined conditions, the proposed method standardizes the experimental set up for uniformly quantifying the surface triboelectrification of general materials. The normalized triboelectric charge density is derived to reveal the intrinsic character of polymers for gaining or losing electrons. This quantitative triboelectric series may serve as a textbook standard for implementing the application of triboelectrification for energy harvesting and self-powered sensing.
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                Author and article information

                Journal
                Sci Adv
                Sci Adv
                SciAdv
                advances
                Science Advances
                American Association for the Advancement of Science
                2375-2548
                August 2020
                19 August 2020
                : 6
                : 34
                : eabb9083
                Affiliations
                [1 ]CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China.
                [2 ]School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
                [3 ]Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning 530004, China.
                [4 ]School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245, USA.
                Author notes
                [* ]Corresponding author. Email: yayang@ 123456binn.cas.cn (Y.Y.); zhong.wang@ 123456mse.gatech.edu (Z.L.W.)
                Author information
                http://orcid.org/0000-0001-6143-7028
                http://orcid.org/0000-0003-0168-2974
                http://orcid.org/0000-0002-5530-0380
                Article
                abb9083
                10.1126/sciadv.abb9083
                7438107
                32875115
                433796c4-55c8-4ef7-8530-9b34f4a741cb
                Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).

                This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 26 March 2020
                : 08 July 2020
                Categories
                Research Article
                Research Articles
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                Materials Science
                Materials Science
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                Adrienne Del Mundo

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