Enhanced electrical conductivity and mechanical stability of flexible pressure-sensitive GNPs/CB/SR composites: Synergis
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ng Huang School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, Anhui Province, People’s Republic of China; and Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, Anhui Province, People’s Republic of China
Caixia Liu, Yue Wang, Xiaohui Guo, and Yugang Zhang School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, Anhui Province, People’s Republic of China
Yunjian Ge Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, Anhui Province, People’s Republic of China (Received 10 August 2015; accepted 21 September 2015)
Silicone Rubber (SR) filled with graphene nanoplatelets (GNPs) and carbon black (CB) is prepared for high performance flexible pressure sensor. Due to the synergetic effect of mixed GNPs and CB, the percolation threshold of GNPs/CB/SR is lower than that of CB/SR, which indicates the addition of GNPs is contributed to enhance the electrical conductivity of GNPs/CB/SR. Moreover, the GNPs/CB/SR has a higher electrical stability and weaker resistance creep than that of GNPs/SR. That is to say, the addition of CB can promote the electrical and mechanical performance of GNPs/CB/SR, simultaneously. The pressure sensor array based on GNPs/CB/SR with weight on different sensing element is tested, and the results show that the size of applied loading on the pressure-sensitivity array can be recognized accurately.
Contributing Editor: Tao Xie a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2015.305
surroundings.5,6 To develop artificial skin interfaces with fully distributed pressure sensing, Polymer composites containing carbon-based fillers have received considerable attention in both academic research and industry because of their high conductivity, low weight, ease of processing, and so on.6–10 There are mainly five types of carbon fillers: carbon black (CB), graphite (G), carbon fibers, carbon nanotubes (CNTs), and graphene nanoplatelets (GNPs), and each type of carbon filler have its own characteristics. For example, CB is cheap, but its percolation threshold is usually high, which could lead to distortion of some properties (e.g., the mechanical properties). Although the percolation threshold of GNPs is very low because of their inherent conductivity and high aspect ratio, the high cost hinders their large scale application. The use of a combination of different carbon fillers would be a good way to get balanced properties and cost. In fact, some polymer-based composites containing two different carbon fillers have been investigated, and a dramatic increase in electrical conductivity has been reported.11–15 It is believed that the two different types of carbon fillers can form cooperative
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Ó Materials Research Society 2015
I. INTRODUCTION
Our skin is the physical barrier through which we interact with surroundings. The effort to create an artificial skin with human-like sensory capabilities is motivated by the possibility of such large, mu
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