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