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The graphene oxide (GO)\u2010based sponge is a potential candidate to endow large deformation. However, it typically exhibits low conductivity and elasticity. Here, the highly conductive and elastic sponge composed of GO, flower\u2010shaped silver nanoparticles (AgNFs), and polyimide (GO\u2010AgNF\u2010PI sponge) are demonstrated. The average pore size and porosity are 114 \u00b5m and 94.7%, respectively. Ag NFs have thin petals (8\u201320 nm) protruding out of the surface of a spherical bud (300\u2013350 nm) significantly enhancing the specific surface area (2.83 m<jats:sup>2<\/jats:sup> g<jats:sup>\u22121<\/jats:sup>). The electrical conductivity (0.306 S m<jats:sup>\u22121<\/jats:sup> at 0% strain) of the GO\u2010AgNF\u2010PI sponge is increased by more than an order of magnitude with the addition of Ag NFs. A nearly perfect elasticity is obtained over a wide compressive strain range (0\u201390%). The strain\u2010dependent, nonlinear variation of Young's modulus of the sponge provides a unique opportunity as a variable stiffness stress sensor that operates over a wide stress range (0\u201310 kPa) with a high maximum sensitivity (0.572 kPa<jats:sup>\u22121<\/jats:sup>). It allows grasping of a soft rose and a hard bottle, with the minimal object deformation, when attached on the finger of a robot gripper.<\/jats:p>","DOI":"10.1002\/smll.201800549","type":"journal-article","created":{"date-parts":[[2018,5,14]],"date-time":"2018-05-14T06:56:12Z","timestamp":1526280972000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":52,"title":["Silver Nanoflower Decorated Graphene Oxide Sponges for Highly Sensitive Variable Stiffness Stress Sensors"],"prefix":"10.1002","volume":"14","author":[{"given":"Fakhre Alam","family":"Khan","sequence":"first","affiliation":[{"name":"School of Mechanical Engineering Sungkyunkwan University (SKKU)  Suwon 16419 Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"C. Muhammed","family":"Ajmal","sequence":"additional","affiliation":[{"name":"Department of Energy Science Sungkyunkwan University (SKKU)  Suwon 16419 Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seonghyun","family":"Bae","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering Sungkyunkwan University (SKKU)  Suwon 16419 Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sungwon","family":"Seo","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering Sungkyunkwan University (SKKU)  Suwon 16419 Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hyungpil","family":"Moon","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering Sungkyunkwan University (SKKU)  Suwon 16419 Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8962-8045","authenticated-orcid":false,"given":"Seunghyun","family":"Baik","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering Sungkyunkwan University (SKKU)  Suwon 16419 Korea"},{"name":"Center for Integrated Nanostructure Physics Institute for Basic Science (IBS)  Suwon 16419 Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2018,5,13]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsnano.5b03864"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1039\/c3ee43385d"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nmat3001"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.201370002"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.7b03322"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms2251"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1021\/nn1027104"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.201870023"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1039\/C5EE00682A"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsnano.5b02781"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201303041"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1039\/C5TC01604E"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1039\/C5NR00841G"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/srep04652"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/asia.201600038"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1038\/srep17726"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/am400480k"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1088\/0957-4484\/19\/44\/445201"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1038\/srep34894"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1039\/C4RA13015D"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1039\/c3ra46004e"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.carbon.2013.10.070"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.matlet.2012.08.101"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1088\/1361-6528\/aa8c57"},{"key":"e_1_2_7_25_1","doi-asserted-by":"publisher","DOI":"10.1038\/nmat2858"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1295\/polymj.22.909"},{"key":"e_1_2_7_27_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201302406"},{"key":"e_1_2_7_28_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201204530"},{"key":"e_1_2_7_29_1","doi-asserted-by":"publisher","DOI":"10.1021\/ez500021w"},{"key":"e_1_2_7_30_1","first-page":"120","volume":"1","author":"Irwin P. 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