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Functional Nanostructured Materials (including low-D carbon)
Bio-Inspired Pretextured Reduced Graphene Oxide Patterns with Multiscale Topographies for High-Performance Mechanosensors Fuxing Yin, Jinzheng Yang, Puguang Ji, Huifen Peng, Yanting Tang, and Wenjing Yuan ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.9b04509 • Publication Date (Web): 01 May 2019 Downloaded from http://pubs.acs.org on May 1, 2019
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ACS Applied Materials & Interfaces
Bio-Inspired Pretextured Reduced Graphene Oxide Patterns with Multiscale Topographies for High-Performance Mechanosensors Fuxing Yin, Jinzheng Yang, Puguang Ji, Huifen Peng, Yanting Tang, Wenjing Yuan*
School of Materials Science & Engineering and Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin, 300130, China. Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Tianjin 300130, China.
KEYWORDS: mechanosensor, bio-inspired, RGO, multiscale topographies, crumpled & cracked ABSTRACT: Highly sensitive mechanical sensing is vital for the emerging field of skin mimicry and wearable healthcare systems. To date, it remains a big challenge to fabricate mechanosensors with both high sensitivity and wide sensing range. In nature, slit sensilla are crack-shaped sensory organs of arachnid which are highly sensitive to tiny external mechanical stimuli. Here, inspired by the geometry of slit sensilla, a concept is developed that pretextures reduced graphene oxide (RGO) nanocoating into multiscale topographies with agminated crumples and interlaced cracks (crumpled & cracked RGO) through an efficient and scalable mechanically driven process. Both the sensitivity and workable range can be facilely tuned through adjusting the crack density. The resulting mechanosensor exhibits comprehensive superior performance including high sensitivity (gauge factor of 205 to 3256), wide and tunable sensing range (from 0-40% to 0-180%), long-term stability (over 5000 1 ACS Paragon Plus Environment
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cycles) and multiple sensing functions. Based on its excellent performances, the mechanosensor can be used as a wearable electronic to in-situ monitor subtle physiological signals and vigorous body actions. The rational designed crumpled & cracked RGO provides a promising platform for artificial electronic skin, and portable healthcare systems. INTRODUCTION Recently, great efforts have been devoted to the investigations of flexible and wearable mechanosensors due to their diverse applications ranging from soft robotics to portable healthcare systems.1-11 Resistive mechanosensors, which generally compose of a conductive sensing element and an elastic matrix, have been widely reported due to their simple structures and sensing mechanisms.12-17 To date, various nanomaterials have
been
exploited
as
nanoparticles/nanowires,18-24
conductive carbon
sensing
nanotubes,25-28
elements,
including
graphene10,
29-30
metal
and
its
derivatives,31-36 etc. Among these materials, reduced graphene oxide (RGO), a common graphene derivative, has been investigated mostly due to its high conductivity, structure flexibility, and potential low-cost and mass production.2, 37-40 In recent years, sensing performances of mechanosensors based on RGO have been greatly improved and sensing functions have been widened.10, 41-44 Generally, graphene or RGO sheets are flexible but non-stretchable, and hence their assembled sensing film would undergo brittle failure under large strain due to the weak interlayer van der Waals forces,1 thus resulting in a narrow sensing range (
