多级孔结构还原态氧化石墨烯气凝胶:从深海玻璃海绵中获得的灵感
采用水热自组装过程
具有超弹性的气凝胶,90%应变循环2万次几乎无残余应变,99%应变循环1万次20%残余应变。这个特性简直太令人吃惊了。美中不足这东西压缩到90%应变以上才会有较大的应力。
Super durable graphene aerogel inspired by deep-sea glass sponge skeleton
RongLuoabc
ZhangpengLia
XianzhangWua
HongLiud
LiminMaab
JianyuWud
GanlinQin
JinqingWangab
ShengrongYang
Highlights
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Sponge skeleton-like graphene aerogel is obtained by hydrothermal self-assembling.
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Superelastic and recycle stability at 99% strain of 10,000 compression cycles.
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Great compressive strength (1.5 MPa) and strength-density ratio (177 kPa cm3 mg−1).
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Electrical conductivity of 42.7 S m−1 and stable current response at 99% strain.
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High-performance wearable piezoresistive sensor for detecting human movements.
Abstract
Herein, a facile hydrothermal self-assembling strategy is employed to prepare a reduced graphene oxide (rGO) aerogel with a multi-scale hierarchical cellular structure inspired by deep-sea glass sponge. This hierarchical cellular structure of the rGO aerogel, obtained by changing the carbon wall to cellular structure, can be broken down into six levels from the nano- to the macro-scale. Remarkably, the rGO aerogel, with multi-step reductions, shows significant flexibility and toughness under extra-high compressions: 99.9% of the original height is remained after 20 000 compression cycles at a high strain of 90%, whereas 79.8% of height is still preserved after 10 000 compression cycles at an extreme strain of 99%. Moreover, the rGO aerogel demonstrates outstanding compressive strength: the stress of 1.5 MPa under 99% strain and the ratio of strength to density of 177 kPa cm3 mg−1, which overcomes the shortcoming of low stress tolerance for general graphene aerogels. In addition, the rGO aerogel shows high electrical conductivity of 42.7 S m−1 and exceptionally stable current signal response even after tens of thousands of compression cycles under extreme strain (99%). The outstanding properties of this graphene aerogel demonstrate its promising potential as a piezoresistive sensor with high stability and wide detection range.
玻璃海绵(Glass sponge)是一种化石,又称维纳斯花篮
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